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/loops-crafted-1/nested3_false-unreach-call.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-b6335f6 [2018-10-23 09:44:51,858 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-23 09:44:51,860 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-23 09:44:51,876 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-23 09:44:51,876 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-23 09:44:51,877 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-23 09:44:51,879 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-23 09:44:51,882 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-23 09:44:51,885 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-23 09:44:51,886 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-23 09:44:51,888 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-23 09:44:51,888 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-23 09:44:51,889 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-23 09:44:51,890 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-23 09:44:51,891 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-23 09:44:51,900 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-23 09:44:51,901 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-23 09:44:51,903 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-23 09:44:51,904 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-23 09:44:51,909 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-23 09:44:51,910 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-23 09:44:51,911 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-23 09:44:51,914 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-23 09:44:51,914 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-23 09:44:51,914 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-23 09:44:51,915 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-23 09:44:51,916 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-23 09:44:51,917 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-23 09:44:51,918 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-23 09:44:51,921 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-23 09:44:51,922 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-23 09:44:51,922 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-23 09:44:51,927 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 [2018-10-23 09:44:51,954 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-23 09:44:51,955 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-23 09:44:51,956 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-23 09:44:51,958 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-23 09:44:51,958 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-23 09:44:51,958 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-23 09:44:51,959 INFO L133 SettingsManager]: * Use SBE=true [2018-10-23 09:44:51,959 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-23 09:44:51,959 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-23 09:44:51,959 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-23 09:44:51,959 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-23 09:44:51,960 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-23 09:44:51,960 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-23 09:44:51,960 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-23 09:44:51,960 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-23 09:44:51,960 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-23 09:44:51,961 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-23 09:44:51,962 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-23 09:44:51,962 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-23 09:44:51,962 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-23 09:44:51,962 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-23 09:44:51,962 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-23 09:44:51,963 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-23 09:44:51,963 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-23 09:44:51,963 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-23 09:44:51,963 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-23 09:44:51,963 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-23 09:44:51,964 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-23 09:44:52,022 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-23 09:44:52,037 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-23 09:44:52,041 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-23 09:44:52,043 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-23 09:44:52,043 INFO L276 PluginConnector]: CDTParser initialized [2018-10-23 09:44:52,044 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops-crafted-1/nested3_false-unreach-call.c [2018-10-23 09:44:52,106 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/52bd7eceb/b25e14b85cb145519c2380754d842883/FLAG7d3d27c09 [2018-10-23 09:44:52,521 INFO L298 CDTParser]: Found 1 translation units. [2018-10-23 09:44:52,522 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested3_false-unreach-call.c [2018-10-23 09:44:52,528 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/52bd7eceb/b25e14b85cb145519c2380754d842883/FLAG7d3d27c09 [2018-10-23 09:44:52,542 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/52bd7eceb/b25e14b85cb145519c2380754d842883 [2018-10-23 09:44:52,551 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-23 09:44:52,553 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-23 09:44:52,554 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-23 09:44:52,554 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-23 09:44:52,558 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-23 09:44:52,559 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:44:52" (1/1) ... [2018-10-23 09:44:52,562 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d964e23 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:44:52, skipping insertion in model container [2018-10-23 09:44:52,562 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:44:52" (1/1) ... [2018-10-23 09:44:52,572 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-23 09:44:52,594 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-23 09:44:52,770 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-23 09:44:52,774 INFO L189 MainTranslator]: Completed pre-run [2018-10-23 09:44:52,799 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-23 09:44:52,816 INFO L193 MainTranslator]: Completed translation [2018-10-23 09:44:52,817 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:44:52 WrapperNode [2018-10-23 09:44:52,817 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-23 09:44:52,818 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-23 09:44:52,818 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-23 09:44:52,819 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-23 09:44:52,830 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:44:52" (1/1) ... [2018-10-23 09:44:52,836 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:44:52" (1/1) ... [2018-10-23 09:44:52,857 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-23 09:44:52,858 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-23 09:44:52,858 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-23 09:44:52,858 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-23 09:44:52,868 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:44:52" (1/1) ... [2018-10-23 09:44:52,868 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:44:52" (1/1) ... [2018-10-23 09:44:52,869 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:44:52" (1/1) ... [2018-10-23 09:44:52,870 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:44:52" (1/1) ... [2018-10-23 09:44:52,872 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:44:52" (1/1) ... [2018-10-23 09:44:52,879 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:44:52" (1/1) ... [2018-10-23 09:44:52,881 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:44:52" (1/1) ... [2018-10-23 09:44:52,890 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-23 09:44:52,890 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-23 09:44:52,890 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-23 09:44:52,890 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-23 09:44:52,891 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:44:52" (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 [2018-10-23 09:44:53,035 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-23 09:44:53,036 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-23 09:44:53,036 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-23 09:44:53,036 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-23 09:44:53,294 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-23 09:44:53,294 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:44:53 BoogieIcfgContainer [2018-10-23 09:44:53,295 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-23 09:44:53,298 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-23 09:44:53,298 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-23 09:44:53,301 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-23 09:44:53,301 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 09:44:52" (1/3) ... [2018-10-23 09:44:53,302 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e5a3918 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:44:53, skipping insertion in model container [2018-10-23 09:44:53,302 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:44:52" (2/3) ... [2018-10-23 09:44:53,302 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e5a3918 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:44:53, skipping insertion in model container [2018-10-23 09:44:53,303 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:44:53" (3/3) ... [2018-10-23 09:44:53,305 INFO L112 eAbstractionObserver]: Analyzing ICFG nested3_false-unreach-call.c [2018-10-23 09:44:53,314 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-23 09:44:53,320 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-23 09:44:53,337 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-23 09:44:53,369 INFO L135 ementStrategyFactory]: Using default assertion order modulation [2018-10-23 09:44:53,369 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-23 09:44:53,369 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-23 09:44:53,370 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-23 09:44:53,370 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-23 09:44:53,370 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-23 09:44:53,370 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-23 09:44:53,370 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-23 09:44:53,370 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-23 09:44:53,388 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-10-23 09:44:53,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-23 09:44:53,393 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:44:53,394 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:44:53,396 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:44:53,401 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:44:53,402 INFO L82 PathProgramCache]: Analyzing trace with hash 1842689724, now seen corresponding path program 1 times [2018-10-23 09:44:53,404 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:44:53,405 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:44:53,453 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:44:53,454 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:44:53,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:44:53,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:44:53,520 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:44:53,522 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 09:44:53,522 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-23 09:44:53,526 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-23 09:44:53,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-23 09:44:53,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-23 09:44:53,541 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2018-10-23 09:44:53,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:44:53,564 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2018-10-23 09:44:53,564 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-23 09:44:53,566 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 7 [2018-10-23 09:44:53,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:44:53,576 INFO L225 Difference]: With dead ends: 42 [2018-10-23 09:44:53,576 INFO L226 Difference]: Without dead ends: 19 [2018-10-23 09:44:53,580 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 [2018-10-23 09:44:53,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-23 09:44:53,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-23 09:44:53,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-23 09:44:53,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2018-10-23 09:44:53,623 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 7 [2018-10-23 09:44:53,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:44:53,623 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2018-10-23 09:44:53,623 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-23 09:44:53,623 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2018-10-23 09:44:53,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-10-23 09:44:53,624 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:44:53,624 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:44:53,625 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:44:53,625 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:44:53,625 INFO L82 PathProgramCache]: Analyzing trace with hash 150549178, now seen corresponding path program 1 times [2018-10-23 09:44:53,625 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:44:53,626 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:44:53,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:44:53,627 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:44:53,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:44:53,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:44:53,801 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:44:53,802 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 09:44:53,802 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-23 09:44:53,804 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-23 09:44:53,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-23 09:44:53,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 09:44:53,805 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand 3 states. [2018-10-23 09:44:53,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:44:53,887 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2018-10-23 09:44:53,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-23 09:44:53,888 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2018-10-23 09:44:53,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:44:53,889 INFO L225 Difference]: With dead ends: 36 [2018-10-23 09:44:53,890 INFO L226 Difference]: Without dead ends: 29 [2018-10-23 09:44:53,891 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 09:44:53,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-23 09:44:53,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 21. [2018-10-23 09:44:53,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-23 09:44:53,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2018-10-23 09:44:53,901 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 8 [2018-10-23 09:44:53,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:44:53,901 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2018-10-23 09:44:53,901 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-23 09:44:53,901 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2018-10-23 09:44:53,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-23 09:44:53,902 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:44:53,902 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:44:53,903 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:44:53,903 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:44:53,903 INFO L82 PathProgramCache]: Analyzing trace with hash -1006359870, now seen corresponding path program 1 times [2018-10-23 09:44:53,903 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:44:53,904 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:44:53,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:44:53,905 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:44:53,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:44:53,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:44:54,060 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:44:54,060 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 09:44:54,061 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-23 09:44:54,061 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-23 09:44:54,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-23 09:44:54,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 09:44:54,062 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 3 states. [2018-10-23 09:44:54,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:44:54,151 INFO L93 Difference]: Finished difference Result 44 states and 55 transitions. [2018-10-23 09:44:54,152 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-23 09:44:54,152 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2018-10-23 09:44:54,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:44:54,153 INFO L225 Difference]: With dead ends: 44 [2018-10-23 09:44:54,154 INFO L226 Difference]: Without dead ends: 27 [2018-10-23 09:44:54,154 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 09:44:54,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-23 09:44:54,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2018-10-23 09:44:54,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-23 09:44:54,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2018-10-23 09:44:54,165 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 10 [2018-10-23 09:44:54,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:44:54,165 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2018-10-23 09:44:54,165 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-23 09:44:54,166 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2018-10-23 09:44:54,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-23 09:44:54,167 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:44:54,167 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:44:54,167 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:44:54,167 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:44:54,168 INFO L82 PathProgramCache]: Analyzing trace with hash -46699894, now seen corresponding path program 1 times [2018-10-23 09:44:54,168 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:44:54,168 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:44:54,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:44:54,172 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:44:54,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:44:54,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:44:54,270 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:44:54,271 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 09:44:54,271 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-23 09:44:54,271 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-23 09:44:54,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-23 09:44:54,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 09:44:54,274 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 3 states. [2018-10-23 09:44:54,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:44:54,327 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2018-10-23 09:44:54,333 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-23 09:44:54,334 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2018-10-23 09:44:54,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:44:54,335 INFO L225 Difference]: With dead ends: 46 [2018-10-23 09:44:54,335 INFO L226 Difference]: Without dead ends: 27 [2018-10-23 09:44:54,336 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 [2018-10-23 09:44:54,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-23 09:44:54,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2018-10-23 09:44:54,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-23 09:44:54,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2018-10-23 09:44:54,341 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 12 [2018-10-23 09:44:54,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:44:54,341 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2018-10-23 09:44:54,341 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-23 09:44:54,342 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2018-10-23 09:44:54,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-23 09:44:54,342 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:44:54,342 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:44:54,343 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:44:54,343 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:44:54,343 INFO L82 PathProgramCache]: Analyzing trace with hash -1174173296, now seen corresponding path program 1 times [2018-10-23 09:44:54,343 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:44:54,343 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:44:54,344 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:44:54,344 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:44:54,345 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:44:54,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:44:54,443 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:44:54,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:44:54,444 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 [2018-10-23 09:44:54,462 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:44:54,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:44:54,500 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:44:54,564 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:44:54,585 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:44:54,586 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-23 09:44:54,586 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-23 09:44:54,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-23 09:44:54,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-23 09:44:54,587 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 4 states. [2018-10-23 09:44:54,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:44:54,667 INFO L93 Difference]: Finished difference Result 50 states and 59 transitions. [2018-10-23 09:44:54,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-23 09:44:54,668 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-23 09:44:54,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:44:54,669 INFO L225 Difference]: With dead ends: 50 [2018-10-23 09:44:54,669 INFO L226 Difference]: Without dead ends: 29 [2018-10-23 09:44:54,670 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-23 09:44:54,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-23 09:44:54,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2018-10-23 09:44:54,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-23 09:44:54,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2018-10-23 09:44:54,676 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 14 [2018-10-23 09:44:54,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:44:54,677 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2018-10-23 09:44:54,677 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-23 09:44:54,677 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2018-10-23 09:44:54,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-23 09:44:54,678 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:44:54,678 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:44:54,678 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:44:54,679 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:44:54,679 INFO L82 PathProgramCache]: Analyzing trace with hash 1950613270, now seen corresponding path program 2 times [2018-10-23 09:44:54,679 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:44:54,679 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:44:54,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:44:54,680 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:44:54,681 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:44:54,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:44:54,987 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:44:54,989 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:44:54,989 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 [2018-10-23 09:44:55,006 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:44:55,033 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:44:55,034 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:44:55,035 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:44:55,051 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:44:55,083 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:44:55,083 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-23 09:44:55,084 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-23 09:44:55,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-23 09:44:55,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-23 09:44:55,085 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 5 states. [2018-10-23 09:44:55,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:44:55,134 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2018-10-23 09:44:55,138 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-23 09:44:55,138 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2018-10-23 09:44:55,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:44:55,139 INFO L225 Difference]: With dead ends: 54 [2018-10-23 09:44:55,139 INFO L226 Difference]: Without dead ends: 31 [2018-10-23 09:44:55,140 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-23 09:44:55,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-23 09:44:55,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2018-10-23 09:44:55,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-23 09:44:55,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2018-10-23 09:44:55,149 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 16 [2018-10-23 09:44:55,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:44:55,150 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2018-10-23 09:44:55,150 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-23 09:44:55,150 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2018-10-23 09:44:55,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-23 09:44:55,151 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:44:55,151 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:44:55,151 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:44:55,152 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:44:55,152 INFO L82 PathProgramCache]: Analyzing trace with hash -1606604004, now seen corresponding path program 3 times [2018-10-23 09:44:55,152 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:44:55,152 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:44:55,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:44:55,153 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:44:55,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:44:55,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:44:55,343 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:44:55,344 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:44:55,344 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 [2018-10-23 09:44:55,362 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 09:44:55,389 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-23 09:44:55,389 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:44:55,391 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:44:55,416 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:44:55,436 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:44:55,437 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-23 09:44:55,437 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-23 09:44:55,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-23 09:44:55,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-23 09:44:55,438 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 6 states. [2018-10-23 09:44:55,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:44:55,496 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2018-10-23 09:44:55,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-23 09:44:55,501 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2018-10-23 09:44:55,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:44:55,502 INFO L225 Difference]: With dead ends: 58 [2018-10-23 09:44:55,502 INFO L226 Difference]: Without dead ends: 33 [2018-10-23 09:44:55,503 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-23 09:44:55,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-23 09:44:55,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2018-10-23 09:44:55,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-23 09:44:55,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2018-10-23 09:44:55,509 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 18 [2018-10-23 09:44:55,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:44:55,509 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2018-10-23 09:44:55,509 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-23 09:44:55,509 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2018-10-23 09:44:55,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-23 09:44:55,510 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:44:55,510 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:44:55,511 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:44:55,511 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:44:55,511 INFO L82 PathProgramCache]: Analyzing trace with hash -1298436702, now seen corresponding path program 4 times [2018-10-23 09:44:55,511 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:44:55,511 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:44:55,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:44:55,512 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:44:55,513 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:44:55,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:44:55,646 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:44:55,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:44:55,647 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 [2018-10-23 09:44:55,657 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:44:55,691 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:44:55,691 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:44:55,693 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:44:55,714 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:44:55,742 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:44:55,742 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-23 09:44:55,742 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-23 09:44:55,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-23 09:44:55,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-23 09:44:55,743 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 7 states. [2018-10-23 09:44:55,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:44:55,812 INFO L93 Difference]: Finished difference Result 62 states and 71 transitions. [2018-10-23 09:44:55,813 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-23 09:44:55,813 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 20 [2018-10-23 09:44:55,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:44:55,814 INFO L225 Difference]: With dead ends: 62 [2018-10-23 09:44:55,814 INFO L226 Difference]: Without dead ends: 35 [2018-10-23 09:44:55,815 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-23 09:44:55,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-10-23 09:44:55,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2018-10-23 09:44:55,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-23 09:44:55,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2018-10-23 09:44:55,821 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 20 [2018-10-23 09:44:55,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:44:55,821 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2018-10-23 09:44:55,821 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-23 09:44:55,821 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2018-10-23 09:44:55,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-23 09:44:55,822 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:44:55,822 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:44:55,823 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:44:55,823 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:44:55,823 INFO L82 PathProgramCache]: Analyzing trace with hash -1502402904, now seen corresponding path program 5 times [2018-10-23 09:44:55,823 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:44:55,823 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:44:55,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:44:55,824 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:44:55,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:44:55,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:44:56,029 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:44:56,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:44:56,029 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 [2018-10-23 09:44:56,037 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-23 09:45:21,190 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-23 09:45:21,191 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:45:21,381 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:45:21,415 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:45:21,448 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:45:21,448 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-10-23 09:45:21,448 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-23 09:45:21,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-23 09:45:21,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-23 09:45:21,449 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 8 states. [2018-10-23 09:45:21,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:45:21,640 INFO L93 Difference]: Finished difference Result 66 states and 75 transitions. [2018-10-23 09:45:21,641 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-23 09:45:21,641 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2018-10-23 09:45:21,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:45:21,642 INFO L225 Difference]: With dead ends: 66 [2018-10-23 09:45:21,642 INFO L226 Difference]: Without dead ends: 37 [2018-10-23 09:45:21,643 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-23 09:45:21,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-23 09:45:21,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2018-10-23 09:45:21,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-23 09:45:21,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2018-10-23 09:45:21,648 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 22 [2018-10-23 09:45:21,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:45:21,649 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2018-10-23 09:45:21,649 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-23 09:45:21,649 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2018-10-23 09:45:21,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-23 09:45:21,650 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:45:21,650 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:45:21,650 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:45:21,651 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:45:21,651 INFO L82 PathProgramCache]: Analyzing trace with hash 54572590, now seen corresponding path program 6 times [2018-10-23 09:45:21,651 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:45:21,651 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:45:21,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:45:21,652 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:45:21,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:45:21,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:45:22,099 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:45:22,101 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:45:22,101 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 [2018-10-23 09:45:22,110 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-23 09:45:22,256 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-23 09:45:22,256 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:45:22,259 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:45:22,275 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:45:22,296 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:45:22,296 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-23 09:45:22,296 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-23 09:45:22,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-23 09:45:22,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-23 09:45:22,297 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 9 states. [2018-10-23 09:45:22,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:45:22,407 INFO L93 Difference]: Finished difference Result 70 states and 79 transitions. [2018-10-23 09:45:22,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-23 09:45:22,409 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2018-10-23 09:45:22,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:45:22,410 INFO L225 Difference]: With dead ends: 70 [2018-10-23 09:45:22,410 INFO L226 Difference]: Without dead ends: 39 [2018-10-23 09:45:22,411 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-23 09:45:22,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-23 09:45:22,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2018-10-23 09:45:22,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-23 09:45:22,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2018-10-23 09:45:22,416 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 24 [2018-10-23 09:45:22,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:45:22,417 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2018-10-23 09:45:22,417 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-23 09:45:22,417 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2018-10-23 09:45:22,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-23 09:45:22,418 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:45:22,418 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:45:22,418 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:45:22,418 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:45:22,418 INFO L82 PathProgramCache]: Analyzing trace with hash 1659403316, now seen corresponding path program 7 times [2018-10-23 09:45:22,419 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:45:22,419 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:45:22,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:45:22,420 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:45:22,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:45:22,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:45:22,736 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:45:22,737 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:45:22,737 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 [2018-10-23 09:45:22,747 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:45:22,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:45:22,768 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:45:22,789 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:45:22,809 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:45:22,809 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-10-23 09:45:22,809 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-23 09:45:22,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-23 09:45:22,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-23 09:45:22,810 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 10 states. [2018-10-23 09:45:22,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:45:22,930 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2018-10-23 09:45:22,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-23 09:45:22,935 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2018-10-23 09:45:22,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:45:22,936 INFO L225 Difference]: With dead ends: 74 [2018-10-23 09:45:22,936 INFO L226 Difference]: Without dead ends: 41 [2018-10-23 09:45:22,938 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-23 09:45:22,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-23 09:45:22,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2018-10-23 09:45:22,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-23 09:45:22,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2018-10-23 09:45:22,948 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 26 [2018-10-23 09:45:22,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:45:22,948 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2018-10-23 09:45:22,949 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-23 09:45:22,952 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2018-10-23 09:45:22,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-23 09:45:22,953 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:45:22,953 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:45:22,953 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:45:22,953 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:45:22,953 INFO L82 PathProgramCache]: Analyzing trace with hash 2008471738, now seen corresponding path program 8 times [2018-10-23 09:45:22,954 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:45:22,954 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:45:22,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:45:22,955 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:45:22,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:45:22,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:45:23,303 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:45:23,303 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:45:23,303 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 [2018-10-23 09:45:23,319 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:45:23,343 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:45:23,343 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:45:23,345 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:45:23,375 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:45:23,405 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:45:23,405 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-23 09:45:23,406 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-23 09:45:23,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-23 09:45:23,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-23 09:45:23,406 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 11 states. [2018-10-23 09:45:23,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:45:23,633 INFO L93 Difference]: Finished difference Result 78 states and 87 transitions. [2018-10-23 09:45:23,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-23 09:45:23,635 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 28 [2018-10-23 09:45:23,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:45:23,636 INFO L225 Difference]: With dead ends: 78 [2018-10-23 09:45:23,636 INFO L226 Difference]: Without dead ends: 43 [2018-10-23 09:45:23,637 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-23 09:45:23,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-23 09:45:23,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2018-10-23 09:45:23,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-23 09:45:23,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2018-10-23 09:45:23,645 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 28 [2018-10-23 09:45:23,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:45:23,645 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2018-10-23 09:45:23,646 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-23 09:45:23,650 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2018-10-23 09:45:23,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-23 09:45:23,651 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:45:23,652 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:45:23,652 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:45:23,652 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:45:23,653 INFO L82 PathProgramCache]: Analyzing trace with hash -1839191104, now seen corresponding path program 9 times [2018-10-23 09:45:23,653 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:45:23,653 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:45:23,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:45:23,654 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:45:23,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:45:23,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:45:23,817 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:45:23,817 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:45:23,818 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 [2018-10-23 09:45:23,826 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 09:45:28,195 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-23 09:45:28,195 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:45:28,247 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:45:28,280 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:45:28,302 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:45:28,302 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-10-23 09:45:28,302 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-23 09:45:28,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-23 09:45:28,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-23 09:45:28,303 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 12 states. [2018-10-23 09:45:28,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:45:28,424 INFO L93 Difference]: Finished difference Result 82 states and 91 transitions. [2018-10-23 09:45:28,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-23 09:45:28,427 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 30 [2018-10-23 09:45:28,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:45:28,428 INFO L225 Difference]: With dead ends: 82 [2018-10-23 09:45:28,428 INFO L226 Difference]: Without dead ends: 45 [2018-10-23 09:45:28,428 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-23 09:45:28,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-23 09:45:28,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2018-10-23 09:45:28,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-23 09:45:28,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2018-10-23 09:45:28,435 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 30 [2018-10-23 09:45:28,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:45:28,435 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2018-10-23 09:45:28,435 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-23 09:45:28,435 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2018-10-23 09:45:28,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-23 09:45:28,436 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:45:28,436 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:45:28,437 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:45:28,437 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:45:28,437 INFO L82 PathProgramCache]: Analyzing trace with hash -1476340410, now seen corresponding path program 10 times [2018-10-23 09:45:28,437 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:45:28,437 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:45:28,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:45:28,438 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:45:28,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:45:28,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:45:28,654 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:45:28,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:45:28,654 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 [2018-10-23 09:45:28,664 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:45:28,681 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:45:28,681 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:45:28,683 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:45:28,721 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:45:28,753 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:45:28,753 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-23 09:45:28,754 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-23 09:45:28,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-23 09:45:28,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-23 09:45:28,754 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 13 states. [2018-10-23 09:45:29,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:45:29,071 INFO L93 Difference]: Finished difference Result 86 states and 95 transitions. [2018-10-23 09:45:29,072 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-23 09:45:29,072 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 32 [2018-10-23 09:45:29,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:45:29,072 INFO L225 Difference]: With dead ends: 86 [2018-10-23 09:45:29,072 INFO L226 Difference]: Without dead ends: 47 [2018-10-23 09:45:29,073 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-23 09:45:29,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-10-23 09:45:29,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45. [2018-10-23 09:45:29,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-23 09:45:29,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2018-10-23 09:45:29,078 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 32 [2018-10-23 09:45:29,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:45:29,079 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2018-10-23 09:45:29,079 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-23 09:45:29,079 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2018-10-23 09:45:29,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-23 09:45:29,080 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:45:29,080 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:45:29,080 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:45:29,080 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:45:29,081 INFO L82 PathProgramCache]: Analyzing trace with hash -669174452, now seen corresponding path program 11 times [2018-10-23 09:45:29,081 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:45:29,081 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:45:29,082 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:45:29,082 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:45:29,082 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:45:29,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:45:29,648 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:45:29,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:45:29,649 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 [2018-10-23 09:45:29,656 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-23 09:47:14,037 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-23 09:47:14,038 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:47:14,074 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:47:14,092 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:47:14,112 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:47:14,113 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-23 09:47:14,113 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-23 09:47:14,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-23 09:47:14,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-23 09:47:14,114 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 14 states. [2018-10-23 09:47:14,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:47:14,318 INFO L93 Difference]: Finished difference Result 90 states and 99 transitions. [2018-10-23 09:47:14,318 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-23 09:47:14,318 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 34 [2018-10-23 09:47:14,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:47:14,319 INFO L225 Difference]: With dead ends: 90 [2018-10-23 09:47:14,319 INFO L226 Difference]: Without dead ends: 49 [2018-10-23 09:47:14,320 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-23 09:47:14,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-23 09:47:14,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2018-10-23 09:47:14,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-23 09:47:14,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2018-10-23 09:47:14,326 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 34 [2018-10-23 09:47:14,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:47:14,326 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2018-10-23 09:47:14,326 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-23 09:47:14,326 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2018-10-23 09:47:14,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-23 09:47:14,327 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:47:14,327 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:47:14,328 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:47:14,328 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:47:14,328 INFO L82 PathProgramCache]: Analyzing trace with hash 1923197906, now seen corresponding path program 12 times [2018-10-23 09:47:14,328 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:47:14,328 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:47:14,329 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:47:14,329 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:47:14,329 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:47:14,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:47:14,779 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:47:14,779 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:47:14,779 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 [2018-10-23 09:47:14,787 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-23 09:47:16,273 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-23 09:47:16,273 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:47:16,277 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:47:16,332 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:47:16,361 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:47:16,362 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-23 09:47:16,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-23 09:47:16,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-23 09:47:16,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-23 09:47:16,363 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 15 states. [2018-10-23 09:47:16,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:47:16,545 INFO L93 Difference]: Finished difference Result 94 states and 103 transitions. [2018-10-23 09:47:16,545 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-23 09:47:16,546 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 36 [2018-10-23 09:47:16,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:47:16,546 INFO L225 Difference]: With dead ends: 94 [2018-10-23 09:47:16,547 INFO L226 Difference]: Without dead ends: 51 [2018-10-23 09:47:16,547 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-23 09:47:16,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-23 09:47:16,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2018-10-23 09:47:16,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-10-23 09:47:16,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2018-10-23 09:47:16,553 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 36 [2018-10-23 09:47:16,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:47:16,554 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2018-10-23 09:47:16,554 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-23 09:47:16,554 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2018-10-23 09:47:16,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-23 09:47:16,555 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:47:16,555 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:47:16,555 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:47:16,556 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:47:16,556 INFO L82 PathProgramCache]: Analyzing trace with hash 2112002264, now seen corresponding path program 13 times [2018-10-23 09:47:16,556 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:47:16,556 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:47:16,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:47:16,557 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:47:16,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:47:16,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:47:17,307 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:47:17,308 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:47:17,308 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 [2018-10-23 09:47:17,317 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:47:17,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:47:17,347 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:47:17,376 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:47:17,397 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:47:17,397 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-10-23 09:47:17,397 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-23 09:47:17,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-23 09:47:17,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-23 09:47:17,398 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand 16 states. [2018-10-23 09:47:17,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:47:17,630 INFO L93 Difference]: Finished difference Result 98 states and 107 transitions. [2018-10-23 09:47:17,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-23 09:47:17,630 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2018-10-23 09:47:17,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:47:17,631 INFO L225 Difference]: With dead ends: 98 [2018-10-23 09:47:17,631 INFO L226 Difference]: Without dead ends: 53 [2018-10-23 09:47:17,631 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-23 09:47:17,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-10-23 09:47:17,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2018-10-23 09:47:17,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-23 09:47:17,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2018-10-23 09:47:17,638 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 38 [2018-10-23 09:47:17,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:47:17,639 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2018-10-23 09:47:17,639 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-23 09:47:17,639 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2018-10-23 09:47:17,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-23 09:47:17,640 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:47:17,640 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:47:17,640 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:47:17,641 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:47:17,641 INFO L82 PathProgramCache]: Analyzing trace with hash -1130603426, now seen corresponding path program 14 times [2018-10-23 09:47:17,641 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:47:17,641 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:47:17,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:47:17,642 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:47:17,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:47:17,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:47:18,027 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:47:18,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:47:18,028 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 [2018-10-23 09:47:18,034 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:47:18,050 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:47:18,050 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:47:18,053 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:47:18,079 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:47:18,099 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:47:18,099 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-23 09:47:18,099 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-23 09:47:18,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-23 09:47:18,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-23 09:47:18,100 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand 17 states. [2018-10-23 09:47:18,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:47:18,433 INFO L93 Difference]: Finished difference Result 102 states and 111 transitions. [2018-10-23 09:47:18,440 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-23 09:47:18,441 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 40 [2018-10-23 09:47:18,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:47:18,442 INFO L225 Difference]: With dead ends: 102 [2018-10-23 09:47:18,442 INFO L226 Difference]: Without dead ends: 55 [2018-10-23 09:47:18,443 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-23 09:47:18,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-23 09:47:18,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 53. [2018-10-23 09:47:18,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-23 09:47:18,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2018-10-23 09:47:18,448 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 40 [2018-10-23 09:47:18,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:47:18,448 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2018-10-23 09:47:18,449 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-23 09:47:18,449 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2018-10-23 09:47:18,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-10-23 09:47:18,449 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:47:18,449 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:47:18,450 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:47:18,450 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:47:18,450 INFO L82 PathProgramCache]: Analyzing trace with hash 871585380, now seen corresponding path program 15 times [2018-10-23 09:47:18,450 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:47:18,450 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:47:18,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:47:18,451 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:47:18,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:47:18,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:47:19,921 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:47:19,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:47:19,922 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 [2018-10-23 09:47:19,935 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 09:48:09,630 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-23 09:48:09,631 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:48:10,602 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:48:10,636 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:48:10,663 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:48:10,664 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-10-23 09:48:10,664 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-23 09:48:10,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-23 09:48:10,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-23 09:48:10,665 INFO L87 Difference]: Start difference. First operand 53 states and 57 transitions. Second operand 18 states. [2018-10-23 09:48:11,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:48:11,111 INFO L93 Difference]: Finished difference Result 106 states and 115 transitions. [2018-10-23 09:48:11,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-23 09:48:11,113 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 42 [2018-10-23 09:48:11,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:48:11,113 INFO L225 Difference]: With dead ends: 106 [2018-10-23 09:48:11,114 INFO L226 Difference]: Without dead ends: 57 [2018-10-23 09:48:11,114 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-23 09:48:11,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-23 09:48:11,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2018-10-23 09:48:11,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-10-23 09:48:11,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2018-10-23 09:48:11,118 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 42 [2018-10-23 09:48:11,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:48:11,119 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2018-10-23 09:48:11,119 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-23 09:48:11,119 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2018-10-23 09:48:11,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-23 09:48:11,120 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:48:11,120 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:48:11,120 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:48:11,120 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:48:11,120 INFO L82 PathProgramCache]: Analyzing trace with hash 829679338, now seen corresponding path program 16 times [2018-10-23 09:48:11,120 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:48:11,121 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:48:11,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:48:11,121 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:48:11,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:48:11,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:48:11,470 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:48:11,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:48:11,471 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:48:11,480 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:48:11,507 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:48:11,507 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:48:11,509 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:48:11,536 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:48:11,569 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:48:11,569 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-10-23 09:48:11,570 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-23 09:48:11,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-23 09:48:11,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-23 09:48:11,570 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand 19 states. [2018-10-23 09:48:11,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:48:11,938 INFO L93 Difference]: Finished difference Result 110 states and 119 transitions. [2018-10-23 09:48:11,939 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-23 09:48:11,939 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 44 [2018-10-23 09:48:11,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:48:11,940 INFO L225 Difference]: With dead ends: 110 [2018-10-23 09:48:11,940 INFO L226 Difference]: Without dead ends: 59 [2018-10-23 09:48:11,941 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-23 09:48:11,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-10-23 09:48:11,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 57. [2018-10-23 09:48:11,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-23 09:48:11,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2018-10-23 09:48:11,945 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 44 [2018-10-23 09:48:11,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:48:11,945 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2018-10-23 09:48:11,946 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-23 09:48:11,946 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2018-10-23 09:48:11,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-23 09:48:11,946 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:48:11,946 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:48:11,947 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:48:11,947 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:48:11,947 INFO L82 PathProgramCache]: Analyzing trace with hash -787321360, now seen corresponding path program 17 times [2018-10-23 09:48:11,947 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:48:11,947 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:48:11,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:48:11,949 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:48:11,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:48:11,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:48:12,255 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:48:12,255 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:48:12,255 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:48:12,271 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown