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/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_nondet_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:09:43,808 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:09:43,810 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:09:43,826 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:09:43,826 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:09:43,827 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:09:43,829 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:09:43,831 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:09:43,833 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:09:43,834 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:09:43,835 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:09:43,835 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:09:43,836 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:09:43,837 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:09:43,838 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:09:43,839 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:09:43,840 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:09:43,845 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:09:43,848 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:09:43,850 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:09:43,851 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:09:43,852 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:09:43,854 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-22 16:09:43,862 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-22 16:09:43,877 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:09:43,878 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:09:43,879 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:09:43,879 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:09:43,879 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:09:43,879 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:09:43,879 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:09:43,880 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:09:43,880 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:09:43,880 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:09:43,880 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:09:43,880 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:09:43,881 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:09:43,881 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:09:43,882 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:09:43,882 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:09:43,882 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:09:43,882 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:09:43,882 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:09:43,883 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:09:43,883 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:09:43,883 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:09:43,883 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:09:43,883 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:09:43,883 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:09:43,884 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:09:43,884 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:09:43,884 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:09:43,884 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:09:43,884 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:09:43,885 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:09:43,885 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:09:43,885 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:09:43,885 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:09:43,941 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:09:43,954 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:09:43,958 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:09:43,960 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:09:43,960 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:09:43,961 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-new/count_by_nondet_true-unreach-call_true-termination.i [2018-10-22 16:09:44,016 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/20ca8f3a5/a2be7b81b5b24c979cca7039392136e0/FLAGa72d113d9 [2018-10-22 16:09:44,447 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:09:44,448 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_nondet_true-unreach-call_true-termination.i [2018-10-22 16:09:44,454 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/20ca8f3a5/a2be7b81b5b24c979cca7039392136e0/FLAGa72d113d9 [2018-10-22 16:09:44,468 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/20ca8f3a5/a2be7b81b5b24c979cca7039392136e0 [2018-10-22 16:09:44,479 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:09:44,481 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:09:44,482 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:09:44,482 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:09:44,487 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:09:44,488 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:09:44" (1/1) ... [2018-10-22 16:09:44,491 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f88e18d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:44, skipping insertion in model container [2018-10-22 16:09:44,492 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:09:44" (1/1) ... [2018-10-22 16:09:44,504 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:09:44,532 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:09:44,759 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:09:44,763 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:09:44,780 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:09:44,797 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:09:44,798 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:44 WrapperNode [2018-10-22 16:09:44,798 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:09:44,798 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:09:44,799 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:09:44,799 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:09:44,808 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:44" (1/1) ... [2018-10-22 16:09:44,814 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:44" (1/1) ... [2018-10-22 16:09:44,820 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:09:44,820 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:09:44,821 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:09:44,821 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:09:44,831 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:44" (1/1) ... [2018-10-22 16:09:44,831 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:44" (1/1) ... [2018-10-22 16:09:44,832 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:44" (1/1) ... [2018-10-22 16:09:44,832 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:44" (1/1) ... [2018-10-22 16:09:44,835 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:44" (1/1) ... [2018-10-22 16:09:44,843 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:44" (1/1) ... [2018-10-22 16:09:44,844 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:44" (1/1) ... [2018-10-22 16:09:44,845 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:09:44,846 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:09:44,846 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:09:44,846 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:09:44,847 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:44" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:09:44,902 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:09:44,903 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:09:44,903 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:09:44,903 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:09:44,903 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:09:44,903 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:09:44,904 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:09:44,904 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:09:45,199 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:09:45,200 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:09:45 BoogieIcfgContainer [2018-10-22 16:09:45,200 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:09:45,201 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:09:45,202 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:09:45,205 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:09:45,205 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:09:44" (1/3) ... [2018-10-22 16:09:45,206 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c07c3a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:09:45, skipping insertion in model container [2018-10-22 16:09:45,207 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:44" (2/3) ... [2018-10-22 16:09:45,207 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c07c3a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:09:45, skipping insertion in model container [2018-10-22 16:09:45,207 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:09:45" (3/3) ... [2018-10-22 16:09:45,209 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_nondet_true-unreach-call_true-termination.i [2018-10-22 16:09:45,220 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:09:45,229 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:09:45,253 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:09:45,294 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:09:45,295 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:09:45,295 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:09:45,296 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:09:45,296 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:09:45,296 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:09:45,296 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:09:45,297 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:09:45,297 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:09:45,320 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-22 16:09:45,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-22 16:09:45,328 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:45,329 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:45,332 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:45,340 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:45,340 INFO L82 PathProgramCache]: Analyzing trace with hash -722424895, now seen corresponding path program 1 times [2018-10-22 16:09:45,343 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:45,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:45,425 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:45,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:45,425 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:45,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:45,478 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:45,480 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:09:45,480 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:09:45,480 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:09:45,484 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:09:45,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:09:45,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:09:45,500 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2018-10-22 16:09:45,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:45,520 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2018-10-22 16:09:45,521 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:09:45,522 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-22 16:09:45,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:45,531 INFO L225 Difference]: With dead ends: 32 [2018-10-22 16:09:45,532 INFO L226 Difference]: Without dead ends: 13 [2018-10-22 16:09:45,535 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:09:45,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-22 16:09:45,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-22 16:09:45,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-22 16:09:45,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-22 16:09:45,571 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-10-22 16:09:45,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:45,572 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-22 16:09:45,572 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:09:45,572 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-22 16:09:45,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 16:09:45,573 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:45,573 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:45,574 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:45,574 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:45,575 INFO L82 PathProgramCache]: Analyzing trace with hash -1289299715, now seen corresponding path program 1 times [2018-10-22 16:09:45,575 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:45,576 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:45,576 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:45,576 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:45,577 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:45,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:45,638 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:45,639 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:09:45,639 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:09:45,639 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:09:45,641 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:09:45,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:09:45,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:09:45,641 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 3 states. [2018-10-22 16:09:45,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:45,667 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-22 16:09:45,667 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:09:45,668 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-22 16:09:45,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:45,668 INFO L225 Difference]: With dead ends: 21 [2018-10-22 16:09:45,668 INFO L226 Difference]: Without dead ends: 16 [2018-10-22 16:09:45,669 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:09:45,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-22 16:09:45,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-10-22 16:09:45,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-22 16:09:45,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-22 16:09:45,675 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2018-10-22 16:09:45,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:45,675 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-22 16:09:45,675 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:09:45,675 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-22 16:09:45,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-22 16:09:45,676 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:45,676 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:45,676 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:45,676 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:45,677 INFO L82 PathProgramCache]: Analyzing trace with hash 1003978365, now seen corresponding path program 1 times [2018-10-22 16:09:45,677 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:45,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:45,678 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:45,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:45,678 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:45,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:45,772 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:45,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:45,773 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:45,774 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-22 16:09:45,776 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [18], [25], [28], [30], [36], [37], [38], [40] [2018-10-22 16:09:45,824 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:09:45,825 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:09:46,310 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:09:46,312 INFO L272 AbstractInterpreter]: Visited 13 different actions 96 times. Merged at 4 different actions 46 times. Widened at 1 different actions 8 times. Found 1 fixpoints after 1 different actions. Largest state had 5 variables. [2018-10-22 16:09:46,350 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:46,352 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:09:46,352 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:46,353 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:46,367 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:46,368 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:46,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:46,404 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:46,433 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:46,435 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:46,524 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:46,545 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:46,546 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:46,564 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:46,564 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:46,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:46,590 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:46,598 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:46,601 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:46,665 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:46,670 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:46,670 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 4 [2018-10-22 16:09:46,671 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:46,671 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-22 16:09:46,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-22 16:09:46,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-22 16:09:46,674 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 4 states. [2018-10-22 16:09:46,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:46,716 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-22 16:09:46,716 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 16:09:46,717 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-22 16:09:46,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:46,717 INFO L225 Difference]: With dead ends: 23 [2018-10-22 16:09:46,718 INFO L226 Difference]: Without dead ends: 18 [2018-10-22 16:09:46,718 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 52 SyntacticMatches, 4 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-22 16:09:46,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-22 16:09:46,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-22 16:09:46,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-22 16:09:46,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-22 16:09:46,722 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 14 [2018-10-22 16:09:46,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:46,723 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-22 16:09:46,723 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-22 16:09:46,723 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-22 16:09:46,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 16:09:46,724 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:46,724 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:46,724 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:46,725 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:46,725 INFO L82 PathProgramCache]: Analyzing trace with hash 6482173, now seen corresponding path program 2 times [2018-10-22 16:09:46,725 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:46,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:46,726 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:46,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:46,726 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:46,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:46,963 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:46,964 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:46,964 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:46,964 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:46,964 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:46,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:46,965 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:46,974 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:46,974 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:47,000 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:47,000 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:47,002 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:47,019 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:47,019 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:47,402 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:47,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:47,424 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:47,440 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:47,440 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:47,461 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:47,461 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:47,465 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:47,495 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:47,496 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:47,508 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:47,509 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:47,510 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-10-22 16:09:47,510 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:47,510 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 16:09:47,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 16:09:47,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:09:47,512 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 7 states. [2018-10-22 16:09:47,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:47,691 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-22 16:09:47,691 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 16:09:47,691 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2018-10-22 16:09:47,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:47,692 INFO L225 Difference]: With dead ends: 27 [2018-10-22 16:09:47,693 INFO L226 Difference]: Without dead ends: 22 [2018-10-22 16:09:47,694 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-10-22 16:09:47,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-22 16:09:47,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-10-22 16:09:47,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-22 16:09:47,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-22 16:09:47,699 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 17 [2018-10-22 16:09:47,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:47,699 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-22 16:09:47,699 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 16:09:47,700 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-22 16:09:47,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-22 16:09:47,700 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:47,701 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:47,701 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:47,701 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:47,701 INFO L82 PathProgramCache]: Analyzing trace with hash 476147325, now seen corresponding path program 3 times [2018-10-22 16:09:47,701 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:47,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:47,703 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:47,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:47,703 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:47,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:47,814 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:47,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:47,815 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:47,815 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:47,815 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:47,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:47,816 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:47,834 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:47,834 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:47,850 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:09:47,850 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:47,852 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:47,894 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:47,895 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:48,302 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:48,326 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:48,326 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:48,343 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:48,343 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:48,372 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:09:48,373 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:48,377 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:48,393 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:48,393 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:48,414 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (7)] Exception during sending of exit command (exit): Broken pipe [2018-10-22 16:09:48,416 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:48,416 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-10-22 16:09:48,416 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:48,417 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 16:09:48,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 16:09:48,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:09:48,418 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2018-10-22 16:09:48,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:48,463 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-22 16:09:48,464 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:09:48,464 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2018-10-22 16:09:48,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:48,465 INFO L225 Difference]: With dead ends: 30 [2018-10-22 16:09:48,465 INFO L226 Difference]: Without dead ends: 25 [2018-10-22 16:09:48,466 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=149, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:09:48,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-22 16:09:48,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2018-10-22 16:09:48,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-22 16:09:48,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-22 16:09:48,472 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 20 [2018-10-22 16:09:48,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:48,472 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-22 16:09:48,472 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 16:09:48,472 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-22 16:09:48,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-22 16:09:48,473 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:48,473 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:48,474 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:48,474 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:48,474 INFO L82 PathProgramCache]: Analyzing trace with hash -732759811, now seen corresponding path program 4 times [2018-10-22 16:09:48,474 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:48,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:48,475 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:48,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:48,476 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:48,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:48,629 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:48,630 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:48,630 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:48,630 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:48,630 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:48,630 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:48,630 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:48,639 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:48,640 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:48,654 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:48,654 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:48,657 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:48,772 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:48,772 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:49,023 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:49,043 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:49,043 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:49,060 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:49,060 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:49,083 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:49,084 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:49,088 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:49,143 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:49,143 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:49,190 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (9)] Exception during sending of exit command (exit): Broken pipe [2018-10-22 16:09:49,192 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:49,192 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 16 [2018-10-22 16:09:49,192 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:49,193 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 16:09:49,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 16:09:49,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=164, Unknown=0, NotChecked=0, Total=240 [2018-10-22 16:09:49,193 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-10-22 16:09:49,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:49,269 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-22 16:09:49,271 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:09:49,271 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-10-22 16:09:49,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:49,272 INFO L225 Difference]: With dead ends: 33 [2018-10-22 16:09:49,272 INFO L226 Difference]: Without dead ends: 28 [2018-10-22 16:09:49,273 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 83 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=82, Invalid=190, Unknown=0, NotChecked=0, Total=272 [2018-10-22 16:09:49,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-22 16:09:49,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2018-10-22 16:09:49,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-22 16:09:49,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-22 16:09:49,278 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 23 [2018-10-22 16:09:49,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:49,279 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-22 16:09:49,279 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 16:09:49,279 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-22 16:09:49,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-22 16:09:49,280 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:49,280 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:49,281 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:49,281 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:49,281 INFO L82 PathProgramCache]: Analyzing trace with hash -1984471427, now seen corresponding path program 5 times [2018-10-22 16:09:49,281 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:49,282 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:49,282 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:49,282 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:49,283 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:49,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:49,507 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:49,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:49,508 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:49,509 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:49,509 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:49,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:49,509 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:49,517 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:49,518 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:49,540 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:09:49,540 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:49,542 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:49,561 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:49,562 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:49,930 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:49,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:49,951 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:49,970 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:49,970 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:50,016 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:09:50,016 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:50,021 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:50,041 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:50,041 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:50,054 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:50,056 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:50,057 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-10-22 16:09:50,057 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:50,058 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:09:50,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:09:50,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=205, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:09:50,059 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 10 states. [2018-10-22 16:09:50,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:50,133 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-22 16:09:50,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:09:50,133 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2018-10-22 16:09:50,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:50,134 INFO L225 Difference]: With dead ends: 36 [2018-10-22 16:09:50,134 INFO L226 Difference]: Without dead ends: 31 [2018-10-22 16:09:50,135 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 94 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=107, Invalid=235, Unknown=0, NotChecked=0, Total=342 [2018-10-22 16:09:50,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-22 16:09:50,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2018-10-22 16:09:50,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-22 16:09:50,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-22 16:09:50,139 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 26 [2018-10-22 16:09:50,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:50,140 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-22 16:09:50,140 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:09:50,140 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-22 16:09:50,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-22 16:09:50,141 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:50,141 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:50,141 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:50,141 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:50,142 INFO L82 PathProgramCache]: Analyzing trace with hash 1475807485, now seen corresponding path program 6 times [2018-10-22 16:09:50,142 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:50,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:50,143 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:50,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:50,143 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:50,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:50,294 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:50,294 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:50,294 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:50,294 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:50,295 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:50,295 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:50,295 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:50,303 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:50,304 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:50,325 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:09:50,325 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:50,328 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:50,354 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:50,354 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:50,587 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:50,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:50,609 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:50,624 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:50,624 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:50,685 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:09:50,685 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:50,689 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:50,735 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:50,735 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:50,757 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:50,758 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:50,759 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-10-22 16:09:50,759 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:50,759 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 16:09:50,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 16:09:50,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=250, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:09:50,760 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 11 states. [2018-10-22 16:09:50,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:50,828 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-22 16:09:50,828 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 16:09:50,828 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2018-10-22 16:09:50,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:50,829 INFO L225 Difference]: With dead ends: 39 [2018-10-22 16:09:50,829 INFO L226 Difference]: Without dead ends: 34 [2018-10-22 16:09:50,830 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=136, Invalid=284, Unknown=0, NotChecked=0, Total=420 [2018-10-22 16:09:50,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-22 16:09:50,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-10-22 16:09:50,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-22 16:09:50,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-22 16:09:50,835 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 29 [2018-10-22 16:09:50,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:50,835 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-22 16:09:50,836 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 16:09:50,836 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-22 16:09:50,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-22 16:09:50,837 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:50,837 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:50,837 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:50,837 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:50,837 INFO L82 PathProgramCache]: Analyzing trace with hash -1160163715, now seen corresponding path program 7 times [2018-10-22 16:09:50,837 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:50,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:50,838 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:50,839 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:50,839 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:50,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:50,995 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:50,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:50,995 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:50,995 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:50,996 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:50,996 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:50,996 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:51,006 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:51,006 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:51,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:51,026 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:51,091 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:51,092 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:51,275 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:51,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:51,298 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:51,315 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:51,315 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:51,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:51,350 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:51,418 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:51,418 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:51,482 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:51,483 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:51,484 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 22 [2018-10-22 16:09:51,484 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:51,484 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 16:09:51,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 16:09:51,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=299, Unknown=0, NotChecked=0, Total=462 [2018-10-22 16:09:51,486 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 12 states. [2018-10-22 16:09:51,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:51,753 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-22 16:09:51,759 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 16:09:51,759 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2018-10-22 16:09:51,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:51,760 INFO L225 Difference]: With dead ends: 42 [2018-10-22 16:09:51,760 INFO L226 Difference]: Without dead ends: 37 [2018-10-22 16:09:51,761 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=169, Invalid=337, Unknown=0, NotChecked=0, Total=506 [2018-10-22 16:09:51,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-22 16:09:51,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2018-10-22 16:09:51,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-22 16:09:51,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-22 16:09:51,767 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 32 [2018-10-22 16:09:51,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:51,768 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-22 16:09:51,768 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 16:09:51,768 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-22 16:09:51,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-22 16:09:51,769 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:51,769 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:51,770 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:51,770 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:51,770 INFO L82 PathProgramCache]: Analyzing trace with hash -196142851, now seen corresponding path program 8 times [2018-10-22 16:09:51,770 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:51,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:51,771 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:51,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:51,771 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:51,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:52,163 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:52,164 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:52,164 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:52,164 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:52,165 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:52,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:52,165 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:52,173 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:52,173 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:52,193 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:52,193 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:52,195 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:52,225 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:52,225 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:52,581 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:52,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:52,602 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:52,617 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:52,617 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:52,656 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:52,656 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:52,660 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:52,683 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:52,684 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:52,694 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:52,696 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:52,697 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-10-22 16:09:52,697 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:52,697 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 16:09:52,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 16:09:52,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=352, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:09:52,698 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 13 states. [2018-10-22 16:09:52,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:52,762 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-22 16:09:52,762 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 16:09:52,762 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2018-10-22 16:09:52,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:52,763 INFO L225 Difference]: With dead ends: 45 [2018-10-22 16:09:52,763 INFO L226 Difference]: Without dead ends: 40 [2018-10-22 16:09:52,764 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 127 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=206, Invalid=394, Unknown=0, NotChecked=0, Total=600 [2018-10-22 16:09:52,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-22 16:09:52,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-10-22 16:09:52,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-22 16:09:52,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-22 16:09:52,769 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 35 [2018-10-22 16:09:52,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:52,770 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-22 16:09:52,770 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 16:09:52,770 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-22 16:09:52,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-22 16:09:52,771 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:52,771 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:52,771 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:52,771 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:52,772 INFO L82 PathProgramCache]: Analyzing trace with hash -1496891779, now seen corresponding path program 9 times [2018-10-22 16:09:52,772 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:52,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:52,773 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:52,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:52,773 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:52,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:53,006 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:53,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:53,007 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:53,007 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:53,007 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:53,007 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:53,007 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:53,017 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:53,017 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:53,041 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:09:53,042 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:53,044 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:53,123 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:53,125 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:53,478 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:53,501 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:53,501 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:53,516 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:53,517 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:53,607 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:09:53,607 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:53,610 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:53,692 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:53,692 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:53,706 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:53,707 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:53,708 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 26 [2018-10-22 16:09:53,708 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:53,708 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 16:09:53,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 16:09:53,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=409, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:09:53,712 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 14 states. [2018-10-22 16:09:53,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:53,790 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-22 16:09:53,791 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 16:09:53,791 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2018-10-22 16:09:53,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:53,792 INFO L225 Difference]: With dead ends: 48 [2018-10-22 16:09:53,793 INFO L226 Difference]: Without dead ends: 43 [2018-10-22 16:09:53,793 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 138 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=247, Invalid=455, Unknown=0, NotChecked=0, Total=702 [2018-10-22 16:09:53,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-22 16:09:53,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-10-22 16:09:53,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-22 16:09:53,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-22 16:09:53,798 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 38 [2018-10-22 16:09:53,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:53,798 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-22 16:09:53,798 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 16:09:53,798 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-22 16:09:53,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-22 16:09:53,799 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:53,799 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:53,799 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:53,800 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:53,800 INFO L82 PathProgramCache]: Analyzing trace with hash 1381705981, now seen corresponding path program 10 times [2018-10-22 16:09:53,800 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:53,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:53,801 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:53,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:53,801 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:53,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:54,103 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:54,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:54,104 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:54,104 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:54,104 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:54,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:54,105 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:54,114 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:54,114 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:54,156 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:54,156 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:54,158 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:54,216 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:54,216 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:54,568 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:54,591 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:54,591 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:54,607 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:54,607 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:54,649 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:54,649 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:54,652 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:54,685 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:54,685 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:54,740 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:54,743 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:54,743 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-10-22 16:09:54,743 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:54,743 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 16:09:54,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 16:09:54,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=470, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:09:54,745 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 15 states. [2018-10-22 16:09:54,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:54,834 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-22 16:09:54,834 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:09:54,834 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 41 [2018-10-22 16:09:54,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:54,836 INFO L225 Difference]: With dead ends: 51 [2018-10-22 16:09:54,836 INFO L226 Difference]: Without dead ends: 46 [2018-10-22 16:09:54,838 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 149 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=292, Invalid=520, Unknown=0, NotChecked=0, Total=812 [2018-10-22 16:09:54,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-22 16:09:54,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-10-22 16:09:54,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-22 16:09:54,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-10-22 16:09:54,843 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 41 [2018-10-22 16:09:54,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:54,844 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-10-22 16:09:54,844 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 16:09:54,844 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-10-22 16:09:54,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-22 16:09:54,845 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:54,845 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:54,845 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:54,846 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:54,846 INFO L82 PathProgramCache]: Analyzing trace with hash 75574909, now seen corresponding path program 11 times [2018-10-22 16:09:54,846 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:54,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:54,847 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:54,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:54,847 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:54,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:55,029 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:55,030 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:55,030 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:55,030 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:55,030 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:55,030 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:55,030 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:55,038 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:55,038 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:55,060 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 16:09:55,060 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:55,063 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:55,236 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:55,237 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:55,569 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:55,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:55,589 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:55,610 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:55,610 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:55,711 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 16:09:55,711 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:55,715 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:55,789 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:55,789 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:55,810 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:55,811 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:55,812 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-10-22 16:09:55,812 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:55,812 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:09:55,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:09:55,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=335, Invalid=535, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:09:55,813 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 16 states. [2018-10-22 16:09:55,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:55,859 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-22 16:09:55,860 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:09:55,860 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 44 [2018-10-22 16:09:55,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:55,861 INFO L225 Difference]: With dead ends: 54 [2018-10-22 16:09:55,861 INFO L226 Difference]: Without dead ends: 49 [2018-10-22 16:09:55,862 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 160 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=341, Invalid=589, Unknown=0, NotChecked=0, Total=930 [2018-10-22 16:09:55,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-22 16:09:55,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2018-10-22 16:09:55,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-22 16:09:55,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-22 16:09:55,867 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 44 [2018-10-22 16:09:55,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:55,867 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-22 16:09:55,867 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:09:55,868 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-22 16:09:55,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-22 16:09:55,868 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:55,868 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:55,869 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:55,869 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:55,869 INFO L82 PathProgramCache]: Analyzing trace with hash 1528510717, now seen corresponding path program 12 times [2018-10-22 16:09:55,869 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:55,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:55,870 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:55,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:55,870 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:55,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:56,079 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:56,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:56,080 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:56,080 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:56,080 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:56,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:56,080 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:56,087 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:56,087 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:56,160 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 16:09:56,160 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:56,163 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:56,221 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:56,221 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:56,595 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:56,617 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:56,617 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:56,635 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:56,635 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:56,750 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 16:09:56,750 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:56,754 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:56,822 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:56,822 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:56,877 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:56,880 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:56,880 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 32 [2018-10-22 16:09:56,880 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:56,881 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 16:09:56,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 16:09:56,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=388, Invalid=604, Unknown=0, NotChecked=0, Total=992 [2018-10-22 16:09:56,882 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 17 states. [2018-10-22 16:09:56,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:56,947 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-22 16:09:56,949 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 16:09:56,949 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 47 [2018-10-22 16:09:56,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:56,950 INFO L225 Difference]: With dead ends: 57 [2018-10-22 16:09:56,951 INFO L226 Difference]: Without dead ends: 52 [2018-10-22 16:09:56,953 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 171 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=394, Invalid=662, Unknown=0, NotChecked=0, Total=1056 [2018-10-22 16:09:56,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-22 16:09:56,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2018-10-22 16:09:56,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-22 16:09:56,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-10-22 16:09:56,960 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 47 [2018-10-22 16:09:56,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:56,960 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-10-22 16:09:56,960 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 16:09:56,960 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-10-22 16:09:56,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-22 16:09:56,962 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:56,962 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:56,962 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:56,962 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:56,963 INFO L82 PathProgramCache]: Analyzing trace with hash 1258757757, now seen corresponding path program 13 times [2018-10-22 16:09:56,963 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:56,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:56,964 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:56,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:56,965 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:56,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:57,210 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:57,210 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:57,210 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:57,211 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:57,211 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:57,211 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:57,211 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:57,220 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:57,220 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:57,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:57,249 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:57,291 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:57,292 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:57,674 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:57,694 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:57,694 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:57,710 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:57,710 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:57,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:57,764 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:57,803 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:57,803 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:57,830 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:57,831 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:57,832 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 34 [2018-10-22 16:09:57,832 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:57,832 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:09:57,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:09:57,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=445, Invalid=677, Unknown=0, NotChecked=0, Total=1122 [2018-10-22 16:09:57,833 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 18 states. [2018-10-22 16:09:57,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:57,872 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-22 16:09:57,872 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 16:09:57,872 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2018-10-22 16:09:57,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:57,873 INFO L225 Difference]: With dead ends: 60 [2018-10-22 16:09:57,874 INFO L226 Difference]: Without dead ends: 55 [2018-10-22 16:09:57,875 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 182 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=451, Invalid=739, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:09:57,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-22 16:09:57,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-10-22 16:09:57,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-22 16:09:57,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-22 16:09:57,880 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 50 [2018-10-22 16:09:57,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:57,880 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-22 16:09:57,881 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:09:57,881 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-22 16:09:57,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-22 16:09:57,882 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:57,882 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:57,882 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:57,882 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:57,882 INFO L82 PathProgramCache]: Analyzing trace with hash 932137213, now seen corresponding path program 14 times [2018-10-22 16:09:57,883 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:57,883 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:57,883 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:57,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:57,884 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:57,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:58,181 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:58,181 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:58,181 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:58,181 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:58,182 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:58,182 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:58,182 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:58,189 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:58,190 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:58,217 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:58,218 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:58,219 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:58,252 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:58,252 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:58,972 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:58,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:58,993 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:59,007 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:59,008 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:59,063 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:59,064 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:59,067 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:59,093 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:59,093 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:59,111 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:59,113 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:59,113 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 36 [2018-10-22 16:09:59,113 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:59,113 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 16:09:59,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 16:09:59,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=506, Invalid=754, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:09:59,114 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 19 states. [2018-10-22 16:09:59,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:59,248 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-22 16:09:59,249 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:09:59,249 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 53 [2018-10-22 16:09:59,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:59,250 INFO L225 Difference]: With dead ends: 63 [2018-10-22 16:09:59,250 INFO L226 Difference]: Without dead ends: 58 [2018-10-22 16:09:59,251 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 193 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=512, Invalid=820, Unknown=0, NotChecked=0, Total=1332 [2018-10-22 16:09:59,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-22 16:09:59,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-10-22 16:09:59,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-22 16:09:59,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-10-22 16:09:59,255 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 53 [2018-10-22 16:09:59,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:59,258 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-10-22 16:09:59,258 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 16:09:59,258 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-10-22 16:09:59,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-22 16:09:59,260 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:59,261 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:59,261 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:59,261 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:59,261 INFO L82 PathProgramCache]: Analyzing trace with hash -1319563651, now seen corresponding path program 15 times [2018-10-22 16:09:59,261 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:59,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:59,262 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:59,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:59,262 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:59,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:59,580 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:59,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:59,581 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:59,581 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:59,581 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:59,581 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:59,581 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:59,589 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:59,589 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:59,626 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:09:59,626 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:59,627 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:59,642 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:59,643 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:00,400 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:00,420 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:00,420 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:00,437 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:00,437 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:00,596 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:10:00,596 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:00,601 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:00,636 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:00,636 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:00,702 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:00,705 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:00,705 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 38 [2018-10-22 16:10:00,705 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:00,706 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 16:10:00,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 16:10:00,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=571, Invalid=835, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 16:10:00,707 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 20 states. [2018-10-22 16:10:00,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:00,882 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-22 16:10:00,883 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-22 16:10:00,883 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 56 [2018-10-22 16:10:00,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:00,883 INFO L225 Difference]: With dead ends: 66 [2018-10-22 16:10:00,884 INFO L226 Difference]: Without dead ends: 61 [2018-10-22 16:10:00,885 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 204 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=577, Invalid=905, Unknown=0, NotChecked=0, Total=1482 [2018-10-22 16:10:00,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-22 16:10:00,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2018-10-22 16:10:00,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-22 16:10:00,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-10-22 16:10:00,891 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 56 [2018-10-22 16:10:00,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:00,891 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-10-22 16:10:00,891 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 16:10:00,891 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-10-22 16:10:00,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-22 16:10:00,892 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:00,892 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:00,892 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:00,893 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:00,893 INFO L82 PathProgramCache]: Analyzing trace with hash 1354193149, now seen corresponding path program 16 times [2018-10-22 16:10:00,893 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:00,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:00,894 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:00,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:00,894 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:00,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:01,737 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:01,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:01,738 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:01,738 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:01,738 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:01,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:01,738 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:01,746 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:01,746 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:01,779 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:01,780 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:01,781 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:01,810 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:01,810 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:03,327 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:03,347 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:03,347 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:03,362 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:03,362 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:03,427 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:03,427 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:03,432 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:03,470 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:03,470 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:03,484 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:03,485 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:03,486 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 40 [2018-10-22 16:10:03,486 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:03,486 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-22 16:10:03,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-22 16:10:03,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=640, Invalid=920, Unknown=0, NotChecked=0, Total=1560 [2018-10-22 16:10:03,487 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 21 states. [2018-10-22 16:10:03,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:03,550 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-22 16:10:03,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-22 16:10:03,550 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 59 [2018-10-22 16:10:03,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:03,551 INFO L225 Difference]: With dead ends: 69 [2018-10-22 16:10:03,551 INFO L226 Difference]: Without dead ends: 64 [2018-10-22 16:10:03,552 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 215 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=646, Invalid=994, Unknown=0, NotChecked=0, Total=1640 [2018-10-22 16:10:03,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-22 16:10:03,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2018-10-22 16:10:03,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-22 16:10:03,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-10-22 16:10:03,557 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 59 [2018-10-22 16:10:03,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:03,558 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-10-22 16:10:03,558 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-22 16:10:03,558 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-10-22 16:10:03,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-22 16:10:03,559 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:03,559 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:03,559 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:03,559 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:03,559 INFO L82 PathProgramCache]: Analyzing trace with hash 779550333, now seen corresponding path program 17 times [2018-10-22 16:10:03,559 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:03,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:03,560 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:03,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:03,560 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:03,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:04,546 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:04,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:04,546 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:04,546 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:04,546 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:04,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:04,547 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:04,555 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:04,556 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:04,593 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 16:10:04,593 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:04,594 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:04,621 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:04,621 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:05,078 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:05,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:05,100 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:05,117 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:05,117 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:05,292 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 16:10:05,292 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:05,296 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:05,340 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:05,340 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:05,370 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:05,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:05,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 42 [2018-10-22 16:10:05,371 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:05,371 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 16:10:05,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 16:10:05,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=713, Invalid=1009, Unknown=0, NotChecked=0, Total=1722 [2018-10-22 16:10:05,373 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 22 states. [2018-10-22 16:10:05,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:05,421 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-22 16:10:05,422 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 16:10:05,422 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 62 [2018-10-22 16:10:05,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:05,423 INFO L225 Difference]: With dead ends: 72 [2018-10-22 16:10:05,423 INFO L226 Difference]: Without dead ends: 67 [2018-10-22 16:10:05,424 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 226 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=719, Invalid=1087, Unknown=0, NotChecked=0, Total=1806 [2018-10-22 16:10:05,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-22 16:10:05,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2018-10-22 16:10:05,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-22 16:10:05,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-10-22 16:10:05,428 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 62 [2018-10-22 16:10:05,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:05,429 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-10-22 16:10:05,429 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 16:10:05,429 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-10-22 16:10:05,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-22 16:10:05,430 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:05,430 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:05,430 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:05,430 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:05,430 INFO L82 PathProgramCache]: Analyzing trace with hash 1335060733, now seen corresponding path program 18 times [2018-10-22 16:10:05,430 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:05,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:05,431 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:05,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:05,431 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:05,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:05,724 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:05,725 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:05,725 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:05,725 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:05,725 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:05,725 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:05,725 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:05,733 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:05,733 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:05,799 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-10-22 16:10:05,799 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:05,802 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:05,860 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:05,860 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:06,733 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:06,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:06,753 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:06,784 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:06,784 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:06,984 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-10-22 16:10:06,984 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:06,988 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:07,019 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:07,019 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:07,071 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:07,072 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:07,072 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 44 [2018-10-22 16:10:07,072 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:07,073 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-22 16:10:07,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-22 16:10:07,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=790, Invalid=1102, Unknown=0, NotChecked=0, Total=1892 [2018-10-22 16:10:07,074 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 23 states. [2018-10-22 16:10:07,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:07,180 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-22 16:10:07,180 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-22 16:10:07,181 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 65 [2018-10-22 16:10:07,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:07,182 INFO L225 Difference]: With dead ends: 75 [2018-10-22 16:10:07,182 INFO L226 Difference]: Without dead ends: 70 [2018-10-22 16:10:07,184 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 237 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=796, Invalid=1184, Unknown=0, NotChecked=0, Total=1980 [2018-10-22 16:10:07,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-22 16:10:07,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2018-10-22 16:10:07,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-22 16:10:07,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-10-22 16:10:07,189 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 65 [2018-10-22 16:10:07,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:07,189 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-10-22 16:10:07,189 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-22 16:10:07,189 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-10-22 16:10:07,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-22 16:10:07,190 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:07,190 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:07,190 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:07,191 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:07,191 INFO L82 PathProgramCache]: Analyzing trace with hash 2036395645, now seen corresponding path program 19 times [2018-10-22 16:10:07,191 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:07,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:07,192 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:07,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:07,192 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:07,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:07,533 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:07,534 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:07,534 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:07,534 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:07,534 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:07,534 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:07,534 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:07,541 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:07,542 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:07,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:07,571 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:07,603 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:07,604 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:08,120 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:08,140 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:08,140 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:08,155 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:08,155 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:08,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:08,224 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:08,253 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:08,253 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:08,293 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:08,294 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:08,294 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24, 24, 24] total 46 [2018-10-22 16:10:08,295 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:08,295 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 16:10:08,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 16:10:08,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=871, Invalid=1199, Unknown=0, NotChecked=0, Total=2070 [2018-10-22 16:10:08,296 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 24 states. [2018-10-22 16:10:08,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:08,483 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-22 16:10:08,483 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-22 16:10:08,483 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 68 [2018-10-22 16:10:08,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:08,484 INFO L225 Difference]: With dead ends: 78 [2018-10-22 16:10:08,484 INFO L226 Difference]: Without dead ends: 73 [2018-10-22 16:10:08,486 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 248 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=877, Invalid=1285, Unknown=0, NotChecked=0, Total=2162 [2018-10-22 16:10:08,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-22 16:10:08,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2018-10-22 16:10:08,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-22 16:10:08,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2018-10-22 16:10:08,489 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 68 [2018-10-22 16:10:08,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:08,489 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2018-10-22 16:10:08,490 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 16:10:08,490 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2018-10-22 16:10:08,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-22 16:10:08,490 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:08,491 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:08,491 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:08,491 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:08,491 INFO L82 PathProgramCache]: Analyzing trace with hash 488863997, now seen corresponding path program 20 times [2018-10-22 16:10:08,491 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:08,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:08,492 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:08,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:08,492 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:08,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:08,793 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:08,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:08,793 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:08,793 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:08,793 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:08,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:08,793 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:08,801 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:08,801 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:08,838 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:08,838 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:08,840 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:08,875 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:08,876 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:09,753 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:09,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:09,774 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:09,791 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:09,791 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:09,869 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:09,870 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:09,874 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:09,913 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:09,913 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:09,937 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:09,938 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:09,938 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 25] total 48 [2018-10-22 16:10:09,938 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:09,939 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-22 16:10:09,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-22 16:10:09,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=956, Invalid=1300, Unknown=0, NotChecked=0, Total=2256 [2018-10-22 16:10:09,940 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand 25 states. [2018-10-22 16:10:10,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:10,003 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-22 16:10:10,006 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-22 16:10:10,006 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 71 [2018-10-22 16:10:10,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:10,007 INFO L225 Difference]: With dead ends: 81 [2018-10-22 16:10:10,007 INFO L226 Difference]: Without dead ends: 76 [2018-10-22 16:10:10,008 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 259 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=962, Invalid=1390, Unknown=0, NotChecked=0, Total=2352 [2018-10-22 16:10:10,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-22 16:10:10,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2018-10-22 16:10:10,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-22 16:10:10,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-10-22 16:10:10,012 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 71 [2018-10-22 16:10:10,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:10,012 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-10-22 16:10:10,012 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-22 16:10:10,012 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-10-22 16:10:10,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-22 16:10:10,013 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:10,013 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:10,013 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:10,013 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:10,014 INFO L82 PathProgramCache]: Analyzing trace with hash 152493693, now seen corresponding path program 21 times [2018-10-22 16:10:10,014 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:10,014 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:10,015 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:10,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:10,015 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:10,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:10,567 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:10,567 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:10,567 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:10,567 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:10,567 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:10,567 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:10,568 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:10,576 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:10,576 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:10,625 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-10-22 16:10:10,626 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:10,627 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:10,656 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:10,657 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:11,304 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:11,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:11,325 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:11,340 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:11,340 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:11,593 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-10-22 16:10:11,594 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:11,598 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:11,637 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:11,637 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:11,657 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:11,658 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:11,658 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 26] total 50 [2018-10-22 16:10:11,658 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:11,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-22 16:10:11,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-22 16:10:11,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1045, Invalid=1405, Unknown=0, NotChecked=0, Total=2450 [2018-10-22 16:10:11,660 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 26 states. [2018-10-22 16:10:11,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:11,774 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2018-10-22 16:10:11,774 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-22 16:10:11,774 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 74 [2018-10-22 16:10:11,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:11,775 INFO L225 Difference]: With dead ends: 84 [2018-10-22 16:10:11,775 INFO L226 Difference]: Without dead ends: 79 [2018-10-22 16:10:11,777 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 270 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1051, Invalid=1499, Unknown=0, NotChecked=0, Total=2550 [2018-10-22 16:10:11,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-22 16:10:11,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2018-10-22 16:10:11,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-22 16:10:11,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 78 transitions. [2018-10-22 16:10:11,780 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 78 transitions. Word has length 74 [2018-10-22 16:10:11,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:11,781 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 78 transitions. [2018-10-22 16:10:11,781 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-22 16:10:11,781 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 78 transitions. [2018-10-22 16:10:11,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-22 16:10:11,781 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:11,781 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:11,782 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:11,782 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:11,782 INFO L82 PathProgramCache]: Analyzing trace with hash -496531203, now seen corresponding path program 22 times [2018-10-22 16:10:11,782 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:11,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:11,783 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:11,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:11,783 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:11,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:12,821 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:12,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:12,821 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:12,821 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:12,822 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:12,822 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:12,822 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:12,833 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:12,833 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:12,872 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:12,872 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:12,874 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:13,006 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:13,006 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:13,842 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:13,864 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:13,864 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:13,881 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:13,881 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:13,963 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:13,963 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:13,968 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:14,004 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:14,004 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:14,016 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:14,017 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:14,017 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 27] total 52 [2018-10-22 16:10:14,017 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:14,017 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-22 16:10:14,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-22 16:10:14,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1138, Invalid=1514, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:14,019 INFO L87 Difference]: Start difference. First operand 78 states and 78 transitions. Second operand 27 states. [2018-10-22 16:10:14,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:14,091 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-10-22 16:10:14,091 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-22 16:10:14,091 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 77 [2018-10-22 16:10:14,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:14,092 INFO L225 Difference]: With dead ends: 87 [2018-10-22 16:10:14,092 INFO L226 Difference]: Without dead ends: 82 [2018-10-22 16:10:14,093 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 281 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1144, Invalid=1612, Unknown=0, NotChecked=0, Total=2756 [2018-10-22 16:10:14,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-22 16:10:14,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2018-10-22 16:10:14,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-10-22 16:10:14,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2018-10-22 16:10:14,096 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 77 [2018-10-22 16:10:14,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:14,096 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2018-10-22 16:10:14,096 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-22 16:10:14,096 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2018-10-22 16:10:14,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-10-22 16:10:14,097 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:14,097 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:14,097 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:14,097 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:14,097 INFO L82 PathProgramCache]: Analyzing trace with hash 345558653, now seen corresponding path program 23 times [2018-10-22 16:10:14,097 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:14,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:14,098 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:14,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:14,098 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:14,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:14,982 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:14,982 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:14,982 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:14,982 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:14,982 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:14,982 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:14,983 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:14,990 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:14,990 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:15,035 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2018-10-22 16:10:15,035 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:15,038 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:15,080 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:15,080 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:15,792 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:15,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:15,812 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:15,827 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:15,827 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:16,106 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2018-10-22 16:10:16,106 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:16,111 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:16,159 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:16,159 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:16,177 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:16,178 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:16,178 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 28] total 54 [2018-10-22 16:10:16,178 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:16,179 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-22 16:10:16,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-22 16:10:16,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1235, Invalid=1627, Unknown=0, NotChecked=0, Total=2862 [2018-10-22 16:10:16,180 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 28 states. [2018-10-22 16:10:16,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:16,245 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2018-10-22 16:10:16,245 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-22 16:10:16,245 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 80 [2018-10-22 16:10:16,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:16,246 INFO L225 Difference]: With dead ends: 90 [2018-10-22 16:10:16,247 INFO L226 Difference]: Without dead ends: 85 [2018-10-22 16:10:16,248 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 292 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1241, Invalid=1729, Unknown=0, NotChecked=0, Total=2970 [2018-10-22 16:10:16,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-22 16:10:16,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2018-10-22 16:10:16,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-22 16:10:16,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 84 transitions. [2018-10-22 16:10:16,252 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 84 transitions. Word has length 80 [2018-10-22 16:10:16,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:16,252 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 84 transitions. [2018-10-22 16:10:16,252 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-22 16:10:16,252 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 84 transitions. [2018-10-22 16:10:16,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-22 16:10:16,253 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:16,253 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:16,253 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:16,253 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:16,254 INFO L82 PathProgramCache]: Analyzing trace with hash 140482813, now seen corresponding path program 24 times [2018-10-22 16:10:16,254 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:16,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:16,254 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:16,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:16,255 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:16,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:16,647 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:16,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:16,647 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:16,648 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:16,648 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:16,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:16,648 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:16,656 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:16,656 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:16,709 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2018-10-22 16:10:16,709 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:16,712 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:16,798 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:16,798 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:17,812 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:17,832 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:17,832 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:17,847 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:17,847 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:18,156 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2018-10-22 16:10:18,156 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:18,161 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:18,215 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:18,215 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:18,249 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:18,250 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:18,250 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 56 [2018-10-22 16:10:18,250 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:18,251 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-22 16:10:18,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-22 16:10:18,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1336, Invalid=1744, Unknown=0, NotChecked=0, Total=3080 [2018-10-22 16:10:18,253 INFO L87 Difference]: Start difference. First operand 84 states and 84 transitions. Second operand 29 states. [2018-10-22 16:10:18,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:18,315 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-10-22 16:10:18,316 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-22 16:10:18,316 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 83 [2018-10-22 16:10:18,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:18,317 INFO L225 Difference]: With dead ends: 93 [2018-10-22 16:10:18,317 INFO L226 Difference]: Without dead ends: 88 [2018-10-22 16:10:18,319 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 303 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 246 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1342, Invalid=1850, Unknown=0, NotChecked=0, Total=3192 [2018-10-22 16:10:18,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-22 16:10:18,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2018-10-22 16:10:18,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-22 16:10:18,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-10-22 16:10:18,323 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 83 [2018-10-22 16:10:18,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:18,323 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-10-22 16:10:18,323 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-22 16:10:18,323 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-10-22 16:10:18,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-10-22 16:10:18,324 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:18,324 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:18,324 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:18,325 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:18,325 INFO L82 PathProgramCache]: Analyzing trace with hash -1830371715, now seen corresponding path program 25 times [2018-10-22 16:10:18,325 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:18,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:18,326 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:18,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:18,326 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:18,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:18,807 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:18,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:18,808 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:18,808 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:18,808 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:18,808 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:18,808 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:18,816 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:18,816 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:18,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:18,862 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:19,122 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:19,123 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:20,249 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:20,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:20,269 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 51 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:20,284 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:20,285 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:20,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:20,376 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:20,478 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:20,479 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:20,523 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:20,527 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:20,527 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 30, 30] total 58 [2018-10-22 16:10:20,527 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:20,528 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-22 16:10:20,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-22 16:10:20,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1441, Invalid=1865, Unknown=0, NotChecked=0, Total=3306 [2018-10-22 16:10:20,530 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 30 states. [2018-10-22 16:10:20,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:20,729 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2018-10-22 16:10:20,729 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-22 16:10:20,729 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 86 [2018-10-22 16:10:20,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:20,730 INFO L225 Difference]: With dead ends: 96 [2018-10-22 16:10:20,730 INFO L226 Difference]: Without dead ends: 91 [2018-10-22 16:10:20,733 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 314 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1447, Invalid=1975, Unknown=0, NotChecked=0, Total=3422 [2018-10-22 16:10:20,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-10-22 16:10:20,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2018-10-22 16:10:20,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-22 16:10:20,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 90 transitions. [2018-10-22 16:10:20,736 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 90 transitions. Word has length 86 [2018-10-22 16:10:20,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:20,737 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 90 transitions. [2018-10-22 16:10:20,737 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-22 16:10:20,737 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 90 transitions. [2018-10-22 16:10:20,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-22 16:10:20,737 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:20,737 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:20,738 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:20,738 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:20,738 INFO L82 PathProgramCache]: Analyzing trace with hash 940288253, now seen corresponding path program 26 times [2018-10-22 16:10:20,738 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:20,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:20,739 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:20,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:20,739 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:20,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:21,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:21,370 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:21,370 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:21,370 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:21,371 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:21,371 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:21,371 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:21,378 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:21,379 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:21,429 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:21,429 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:21,432 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:21,462 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:21,462 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:22,337 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:22,357 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:22,357 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 53 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:22,372 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:22,372 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:22,467 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:22,467 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:22,472 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:22,516 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:22,516 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:22,534 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:22,535 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:22,535 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 31] total 60 [2018-10-22 16:10:22,535 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:22,536 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-22 16:10:22,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-22 16:10:22,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1550, Invalid=1990, Unknown=0, NotChecked=0, Total=3540 [2018-10-22 16:10:22,537 INFO L87 Difference]: Start difference. First operand 90 states and 90 transitions. Second operand 31 states. [2018-10-22 16:10:22,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:22,605 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-10-22 16:10:22,612 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-22 16:10:22,612 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 89 [2018-10-22 16:10:22,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:22,613 INFO L225 Difference]: With dead ends: 99 [2018-10-22 16:10:22,613 INFO L226 Difference]: Without dead ends: 94 [2018-10-22 16:10:22,614 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 325 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1556, Invalid=2104, Unknown=0, NotChecked=0, Total=3660 [2018-10-22 16:10:22,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-10-22 16:10:22,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2018-10-22 16:10:22,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-10-22 16:10:22,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2018-10-22 16:10:22,618 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 89 [2018-10-22 16:10:22,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:22,618 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2018-10-22 16:10:22,618 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-22 16:10:22,618 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2018-10-22 16:10:22,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-10-22 16:10:22,619 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:22,619 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:22,619 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:22,619 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:22,619 INFO L82 PathProgramCache]: Analyzing trace with hash 989900413, now seen corresponding path program 27 times [2018-10-22 16:10:22,620 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:22,620 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:22,620 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:22,620 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:22,621 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:22,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:23,209 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:23,209 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:23,209 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:23,209 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:23,209 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:23,209 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:23,209 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:23,217 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:23,218 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:23,274 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-10-22 16:10:23,275 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:23,277 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:23,681 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:23,681 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:25,255 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:25,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:25,281 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 55 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:25,296 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:25,296 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:25,672 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-10-22 16:10:25,673 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:25,679 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:25,772 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:25,772 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:25,803 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:25,804 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:25,804 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32, 32, 32] total 62 [2018-10-22 16:10:25,804 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:25,805 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-22 16:10:25,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-22 16:10:25,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1663, Invalid=2119, Unknown=0, NotChecked=0, Total=3782 [2018-10-22 16:10:25,806 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 32 states. [2018-10-22 16:10:25,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:25,870 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2018-10-22 16:10:25,870 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-22 16:10:25,870 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 92 [2018-10-22 16:10:25,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:25,871 INFO L225 Difference]: With dead ends: 102 [2018-10-22 16:10:25,872 INFO L226 Difference]: Without dead ends: 97 [2018-10-22 16:10:25,873 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 336 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1669, Invalid=2237, Unknown=0, NotChecked=0, Total=3906 [2018-10-22 16:10:25,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-22 16:10:25,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2018-10-22 16:10:25,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-10-22 16:10:25,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 96 transitions. [2018-10-22 16:10:25,876 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 96 transitions. Word has length 92 [2018-10-22 16:10:25,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:25,877 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 96 transitions. [2018-10-22 16:10:25,877 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-22 16:10:25,877 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 96 transitions. [2018-10-22 16:10:25,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-22 16:10:25,878 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:25,878 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:25,878 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:25,878 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:25,878 INFO L82 PathProgramCache]: Analyzing trace with hash 1517009149, now seen corresponding path program 28 times [2018-10-22 16:10:25,878 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:25,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:25,879 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:25,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:25,879 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:25,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:26,353 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:26,354 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:26,354 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:26,354 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:26,354 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:26,354 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:26,354 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:26,362 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:26,362 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:26,414 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:26,414 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:26,416 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:26,620 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:26,620 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:27,748 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:27,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:27,780 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 57 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:27,805 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:27,805 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:27,907 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:27,908 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:27,913 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:28,052 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:28,052 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:28,069 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:28,070 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:28,070 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 33] total 64 [2018-10-22 16:10:28,070 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:28,070 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-22 16:10:28,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-22 16:10:28,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1780, Invalid=2252, Unknown=0, NotChecked=0, Total=4032 [2018-10-22 16:10:28,072 INFO L87 Difference]: Start difference. First operand 96 states and 96 transitions. Second operand 33 states. [2018-10-22 16:10:28,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:28,171 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-10-22 16:10:28,178 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-22 16:10:28,178 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 95 [2018-10-22 16:10:28,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:28,179 INFO L225 Difference]: With dead ends: 105 [2018-10-22 16:10:28,179 INFO L226 Difference]: Without dead ends: 100 [2018-10-22 16:10:28,180 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 347 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 286 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1786, Invalid=2374, Unknown=0, NotChecked=0, Total=4160 [2018-10-22 16:10:28,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-22 16:10:28,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2018-10-22 16:10:28,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-22 16:10:28,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-10-22 16:10:28,183 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 95 [2018-10-22 16:10:28,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:28,184 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-10-22 16:10:28,184 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-22 16:10:28,184 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-10-22 16:10:28,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-10-22 16:10:28,185 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:28,185 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:28,185 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:28,185 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:28,185 INFO L82 PathProgramCache]: Analyzing trace with hash -2082038147, now seen corresponding path program 29 times [2018-10-22 16:10:28,185 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:28,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:28,186 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:28,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:28,186 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:28,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:28,713 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:28,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:28,713 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:28,713 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:28,713 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:28,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:28,713 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:28,723 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:28,723 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:28,956 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2018-10-22 16:10:28,956 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:28,958 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:29,187 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:29,187 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:30,788 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:30,809 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:30,809 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 59 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:30,824 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:30,825 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:31,231 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2018-10-22 16:10:31,231 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:31,236 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:31,279 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:31,279 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:31,347 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:31,351 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:31,351 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34, 34, 34] total 66 [2018-10-22 16:10:31,351 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:31,352 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-22 16:10:31,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-22 16:10:31,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1901, Invalid=2389, Unknown=0, NotChecked=0, Total=4290 [2018-10-22 16:10:31,353 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 34 states. [2018-10-22 16:10:31,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:31,535 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2018-10-22 16:10:31,535 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-22 16:10:31,536 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 98 [2018-10-22 16:10:31,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:31,537 INFO L225 Difference]: With dead ends: 108 [2018-10-22 16:10:31,537 INFO L226 Difference]: Without dead ends: 103 [2018-10-22 16:10:31,538 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 358 SyntacticMatches, 2 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 296 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1907, Invalid=2515, Unknown=0, NotChecked=0, Total=4422 [2018-10-22 16:10:31,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-22 16:10:31,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2018-10-22 16:10:31,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-22 16:10:31,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 102 transitions. [2018-10-22 16:10:31,543 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 102 transitions. Word has length 98 [2018-10-22 16:10:31,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:31,543 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 102 transitions. [2018-10-22 16:10:31,544 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-22 16:10:31,544 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 102 transitions. [2018-10-22 16:10:31,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-22 16:10:31,544 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:31,544 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:31,545 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:31,545 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:31,545 INFO L82 PathProgramCache]: Analyzing trace with hash -1736455939, now seen corresponding path program 30 times [2018-10-22 16:10:31,545 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:31,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:31,546 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:31,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:31,546 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:31,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:32,065 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:32,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:32,066 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:32,066 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:32,066 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:32,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:32,066 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:32,078 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:32,078 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:32,145 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2018-10-22 16:10:32,145 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:32,148 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:32,195 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:32,195 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:33,396 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:33,416 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:33,416 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 61 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:33,431 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:33,431 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:33,884 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2018-10-22 16:10:33,885 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:33,891 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:33,919 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:33,919 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:33,943 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:33,945 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:33,945 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35, 35, 35] total 68 [2018-10-22 16:10:33,945 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:33,945 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-22 16:10:33,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-22 16:10:33,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2026, Invalid=2530, Unknown=0, NotChecked=0, Total=4556 [2018-10-22 16:10:33,946 INFO L87 Difference]: Start difference. First operand 102 states and 102 transitions. Second operand 35 states. [2018-10-22 16:10:34,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:34,069 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-10-22 16:10:34,070 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-22 16:10:34,070 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 101 [2018-10-22 16:10:34,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:34,071 INFO L225 Difference]: With dead ends: 111 [2018-10-22 16:10:34,071 INFO L226 Difference]: Without dead ends: 106 [2018-10-22 16:10:34,072 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 369 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2032, Invalid=2660, Unknown=0, NotChecked=0, Total=4692 [2018-10-22 16:10:34,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-10-22 16:10:34,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2018-10-22 16:10:34,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-22 16:10:34,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2018-10-22 16:10:34,076 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 101 [2018-10-22 16:10:34,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:34,077 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2018-10-22 16:10:34,077 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-22 16:10:34,077 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2018-10-22 16:10:34,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-22 16:10:34,078 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:34,078 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:34,078 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:34,078 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:34,078 INFO L82 PathProgramCache]: Analyzing trace with hash -1533505923, now seen corresponding path program 31 times [2018-10-22 16:10:34,078 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:34,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:34,079 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:34,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:34,079 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:34,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:34,624 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:34,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:34,625 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:34,625 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:34,625 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:34,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:34,625 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:34,634 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:34,634 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:34,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:34,690 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:34,737 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:34,737 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:36,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:36,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:36,269 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 63 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:36,284 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:36,284 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:36,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:36,391 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:36,477 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:36,477 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:36,492 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:36,493 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:36,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36, 36, 36] total 70 [2018-10-22 16:10:36,494 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:36,494 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-22 16:10:36,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-22 16:10:36,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2155, Invalid=2675, Unknown=0, NotChecked=0, Total=4830 [2018-10-22 16:10:36,496 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 36 states. [2018-10-22 16:10:36,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:36,629 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2018-10-22 16:10:36,629 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-22 16:10:36,630 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 104 [2018-10-22 16:10:36,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:36,631 INFO L225 Difference]: With dead ends: 114 [2018-10-22 16:10:36,631 INFO L226 Difference]: Without dead ends: 109 [2018-10-22 16:10:36,632 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 451 GetRequests, 380 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2161, Invalid=2809, Unknown=0, NotChecked=0, Total=4970 [2018-10-22 16:10:36,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-10-22 16:10:36,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 108. [2018-10-22 16:10:36,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-10-22 16:10:36,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 108 transitions. [2018-10-22 16:10:36,636 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 108 transitions. Word has length 104 [2018-10-22 16:10:36,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:36,636 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 108 transitions. [2018-10-22 16:10:36,637 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-22 16:10:36,637 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 108 transitions. [2018-10-22 16:10:36,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-10-22 16:10:36,637 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:36,637 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:36,638 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:36,638 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:36,638 INFO L82 PathProgramCache]: Analyzing trace with hash 1531435261, now seen corresponding path program 32 times [2018-10-22 16:10:36,638 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:36,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:36,639 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:36,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:36,639 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:36,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:37,184 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:37,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:37,184 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:37,184 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:37,185 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:37,185 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:37,185 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:37,193 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:37,193 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:37,248 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:37,249 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:37,251 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:37,732 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:37,732 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:39,175 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:39,196 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:39,196 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 65 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:39,211 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:39,211 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:39,323 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:39,323 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:39,329 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:39,634 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:39,634 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:39,688 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:39,689 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:39,690 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37, 37, 37] total 72 [2018-10-22 16:10:39,690 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:39,690 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-22 16:10:39,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-22 16:10:39,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2288, Invalid=2824, Unknown=0, NotChecked=0, Total=5112 [2018-10-22 16:10:39,691 INFO L87 Difference]: Start difference. First operand 108 states and 108 transitions. Second operand 37 states. [2018-10-22 16:10:39,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:39,773 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2018-10-22 16:10:39,773 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-22 16:10:39,773 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 107 [2018-10-22 16:10:39,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:39,774 INFO L225 Difference]: With dead ends: 117 [2018-10-22 16:10:39,775 INFO L226 Difference]: Without dead ends: 112 [2018-10-22 16:10:39,776 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 391 SyntacticMatches, 2 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2294, Invalid=2962, Unknown=0, NotChecked=0, Total=5256 [2018-10-22 16:10:39,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-10-22 16:10:39,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2018-10-22 16:10:39,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-10-22 16:10:39,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2018-10-22 16:10:39,779 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 107 [2018-10-22 16:10:39,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:39,780 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2018-10-22 16:10:39,780 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-22 16:10:39,780 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2018-10-22 16:10:39,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-10-22 16:10:39,780 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:39,781 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:39,781 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:39,781 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:39,781 INFO L82 PathProgramCache]: Analyzing trace with hash -1810465155, now seen corresponding path program 33 times [2018-10-22 16:10:39,781 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:39,782 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:39,782 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:39,782 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:39,782 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:39,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:40,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:40,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:40,729 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:40,729 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:40,729 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:40,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:40,729 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:40,736 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:40,736 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:40,926 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-10-22 16:10:40,926 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:40,929 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:40,974 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:40,974 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:42,444 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:42,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:42,464 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 67 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:42,479 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:42,479 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:43,006 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-10-22 16:10:43,006 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:43,012 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:43,063 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:43,064 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:43,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:43,080 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:43,080 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38, 38, 38] total 74 [2018-10-22 16:10:43,080 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:43,081 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-22 16:10:43,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-22 16:10:43,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2018-10-22 16:10:43,082 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 38 states. [2018-10-22 16:10:43,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:43,191 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2018-10-22 16:10:43,191 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-22 16:10:43,191 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 110 [2018-10-22 16:10:43,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:43,192 INFO L225 Difference]: With dead ends: 120 [2018-10-22 16:10:43,192 INFO L226 Difference]: Without dead ends: 115 [2018-10-22 16:10:43,193 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 402 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2431, Invalid=3119, Unknown=0, NotChecked=0, Total=5550 [2018-10-22 16:10:43,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-22 16:10:43,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 114. [2018-10-22 16:10:43,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-22 16:10:43,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 114 transitions. [2018-10-22 16:10:43,196 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 114 transitions. Word has length 110 [2018-10-22 16:10:43,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:43,196 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 114 transitions. [2018-10-22 16:10:43,196 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-22 16:10:43,196 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 114 transitions. [2018-10-22 16:10:43,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-10-22 16:10:43,197 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:43,197 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:43,197 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:43,198 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:43,198 INFO L82 PathProgramCache]: Analyzing trace with hash 1271130365, now seen corresponding path program 34 times [2018-10-22 16:10:43,198 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:43,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:43,199 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:43,199 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:43,199 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:43,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:44,752 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:44,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:44,753 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:44,753 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:44,753 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:44,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:44,753 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:44,760 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:44,760 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:44,824 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:44,824 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:44,827 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:45,063 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:45,064 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:46,750 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:46,770 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:46,770 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 69 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:46,785 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:46,785 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:46,901 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:46,901 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:46,906 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:46,956 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:46,956 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:46,978 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:46,980 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:46,980 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39, 39, 39] total 76 [2018-10-22 16:10:46,980 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:46,981 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-22 16:10:46,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-22 16:10:46,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2566, Invalid=3134, Unknown=0, NotChecked=0, Total=5700 [2018-10-22 16:10:46,982 INFO L87 Difference]: Start difference. First operand 114 states and 114 transitions. Second operand 39 states. [2018-10-22 16:10:47,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:47,097 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-10-22 16:10:47,097 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-22 16:10:47,098 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 113 [2018-10-22 16:10:47,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:47,099 INFO L225 Difference]: With dead ends: 123 [2018-10-22 16:10:47,099 INFO L226 Difference]: Without dead ends: 118 [2018-10-22 16:10:47,100 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 413 SyntacticMatches, 2 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2572, Invalid=3280, Unknown=0, NotChecked=0, Total=5852 [2018-10-22 16:10:47,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-10-22 16:10:47,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2018-10-22 16:10:47,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-22 16:10:47,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2018-10-22 16:10:47,103 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 113 [2018-10-22 16:10:47,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:47,104 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2018-10-22 16:10:47,104 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-22 16:10:47,104 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2018-10-22 16:10:47,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-22 16:10:47,104 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:47,105 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:47,105 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:47,105 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:47,105 INFO L82 PathProgramCache]: Analyzing trace with hash 157314685, now seen corresponding path program 35 times [2018-10-22 16:10:47,105 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:47,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:47,106 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:47,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:47,106 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:47,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:47,929 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:47,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:47,929 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:47,929 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:47,929 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:47,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:47,929 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:47,950 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:47,951 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:48,158 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 36 check-sat command(s) [2018-10-22 16:10:48,158 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:48,162 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:48,414 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:48,414 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:49,957 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:49,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:49,977 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 71 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:49,992 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:49,992 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:50,541 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 36 check-sat command(s) [2018-10-22 16:10:50,542 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:50,547 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:50,607 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:50,607 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:50,623 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:50,624 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:50,624 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40, 40, 40] total 78 [2018-10-22 16:10:50,624 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:50,624 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-22 16:10:50,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-22 16:10:50,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2711, Invalid=3295, Unknown=0, NotChecked=0, Total=6006 [2018-10-22 16:10:50,625 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 40 states. [2018-10-22 16:10:50,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:50,727 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2018-10-22 16:10:50,727 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-22 16:10:50,727 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 116 [2018-10-22 16:10:50,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:50,729 INFO L225 Difference]: With dead ends: 126 [2018-10-22 16:10:50,729 INFO L226 Difference]: Without dead ends: 121 [2018-10-22 16:10:50,730 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 424 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 356 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2717, Invalid=3445, Unknown=0, NotChecked=0, Total=6162 [2018-10-22 16:10:50,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-10-22 16:10:50,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2018-10-22 16:10:50,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-10-22 16:10:50,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 120 transitions. [2018-10-22 16:10:50,734 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 120 transitions. Word has length 116 [2018-10-22 16:10:50,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:50,734 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 120 transitions. [2018-10-22 16:10:50,734 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-22 16:10:50,734 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 120 transitions. [2018-10-22 16:10:50,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-22 16:10:50,735 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:50,735 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:50,735 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:50,735 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:50,735 INFO L82 PathProgramCache]: Analyzing trace with hash 1391720701, now seen corresponding path program 36 times [2018-10-22 16:10:50,736 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:50,736 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:50,736 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:50,736 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:50,736 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:50,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:51,625 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:51,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:51,625 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:51,626 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:51,626 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:51,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:51,626 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:51,632 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:51,633 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:51,732 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 37 check-sat command(s) [2018-10-22 16:10:51,732 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:51,735 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:51,784 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:51,784 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:53,374 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:53,394 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:53,394 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 73 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:53,409 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:53,409 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:54,009 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 37 check-sat command(s) [2018-10-22 16:10:54,009 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:54,015 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:54,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:54,132 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:54,232 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:54,234 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:54,234 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41, 41, 41] total 80 [2018-10-22 16:10:54,234 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:54,235 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-22 16:10:54,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-22 16:10:54,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2860, Invalid=3460, Unknown=0, NotChecked=0, Total=6320 [2018-10-22 16:10:54,236 INFO L87 Difference]: Start difference. First operand 120 states and 120 transitions. Second operand 41 states. [2018-10-22 16:10:54,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:54,402 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2018-10-22 16:10:54,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-22 16:10:54,402 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 119 [2018-10-22 16:10:54,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:54,403 INFO L225 Difference]: With dead ends: 129 [2018-10-22 16:10:54,403 INFO L226 Difference]: Without dead ends: 124 [2018-10-22 16:10:54,404 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 516 GetRequests, 435 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 366 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2866, Invalid=3614, Unknown=0, NotChecked=0, Total=6480 [2018-10-22 16:10:54,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-22 16:10:54,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2018-10-22 16:10:54,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-10-22 16:10:54,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2018-10-22 16:10:54,407 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 119 [2018-10-22 16:10:54,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:54,407 INFO L481 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2018-10-22 16:10:54,407 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-22 16:10:54,407 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2018-10-22 16:10:54,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-10-22 16:10:54,408 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:54,408 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:54,408 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:54,408 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:54,408 INFO L82 PathProgramCache]: Analyzing trace with hash 2071355005, now seen corresponding path program 37 times [2018-10-22 16:10:54,408 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:54,409 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:54,409 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:54,409 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:54,409 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:54,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:55,110 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:55,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:55,111 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:55,111 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:55,111 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:55,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:55,111 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:55,119 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:55,119 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:55,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:55,177 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:55,282 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:55,282 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:57,211 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:57,231 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:57,231 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 75 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:57,246 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:57,246 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:57,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:57,377 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:57,430 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:57,430 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:57,448 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:57,449 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:57,450 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42, 42, 42] total 82 [2018-10-22 16:10:57,450 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:57,450 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-22 16:10:57,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-22 16:10:57,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3013, Invalid=3629, Unknown=0, NotChecked=0, Total=6642 [2018-10-22 16:10:57,451 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 42 states. [2018-10-22 16:10:57,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:57,582 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2018-10-22 16:10:57,582 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-22 16:10:57,582 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 122 [2018-10-22 16:10:57,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:57,584 INFO L225 Difference]: With dead ends: 132 [2018-10-22 16:10:57,584 INFO L226 Difference]: Without dead ends: 127 [2018-10-22 16:10:57,585 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 529 GetRequests, 446 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3019, Invalid=3787, Unknown=0, NotChecked=0, Total=6806 [2018-10-22 16:10:57,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-22 16:10:57,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2018-10-22 16:10:57,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-10-22 16:10:57,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 126 transitions. [2018-10-22 16:10:57,588 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 126 transitions. Word has length 122 [2018-10-22 16:10:57,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:57,589 INFO L481 AbstractCegarLoop]: Abstraction has 126 states and 126 transitions. [2018-10-22 16:10:57,589 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-22 16:10:57,589 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 126 transitions. [2018-10-22 16:10:57,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-22 16:10:57,590 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:57,590 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:57,590 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:57,590 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:57,590 INFO L82 PathProgramCache]: Analyzing trace with hash -1713895171, now seen corresponding path program 38 times [2018-10-22 16:10:57,591 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:57,591 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:57,591 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:57,591 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:57,591 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:57,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:00,285 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:00,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:00,285 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:00,285 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:00,286 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:00,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:00,286 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:00,293 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:11:00,293 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:00,352 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:11:00,352 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:00,355 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:00,423 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:00,423 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:02,415 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:02,435 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:02,435 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 77 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:02,450 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:11:02,450 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:02,581 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:11:02,582 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:02,588 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:02,643 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:02,643 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:02,662 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:02,663 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:02,663 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43, 43, 43] total 84 [2018-10-22 16:11:02,664 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:02,664 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-22 16:11:02,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-22 16:11:02,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3170, Invalid=3802, Unknown=0, NotChecked=0, Total=6972 [2018-10-22 16:11:02,665 INFO L87 Difference]: Start difference. First operand 126 states and 126 transitions. Second operand 43 states. [2018-10-22 16:11:02,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:02,869 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-10-22 16:11:02,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-22 16:11:02,870 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 125 [2018-10-22 16:11:02,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:02,870 INFO L225 Difference]: With dead ends: 135 [2018-10-22 16:11:02,871 INFO L226 Difference]: Without dead ends: 130 [2018-10-22 16:11:02,871 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 542 GetRequests, 457 SyntacticMatches, 2 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 386 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=3176, Invalid=3964, Unknown=0, NotChecked=0, Total=7140 [2018-10-22 16:11:02,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-10-22 16:11:02,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2018-10-22 16:11:02,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-22 16:11:02,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2018-10-22 16:11:02,875 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 125 [2018-10-22 16:11:02,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:02,876 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2018-10-22 16:11:02,876 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-22 16:11:02,876 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2018-10-22 16:11:02,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-10-22 16:11:02,877 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:02,877 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:02,877 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:02,877 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:02,877 INFO L82 PathProgramCache]: Analyzing trace with hash 559435389, now seen corresponding path program 39 times [2018-10-22 16:11:02,878 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:02,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:02,878 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:02,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:02,878 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:02,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:04,444 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:04,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:04,445 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:04,445 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:04,445 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:04,445 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:04,445 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:04,453 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:11:04,453 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:11:04,537 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-10-22 16:11:04,538 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:04,540 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:04,585 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:04,585 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:06,806 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:06,826 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:06,826 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 79 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:06,840 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:11:06,841 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:11:07,533 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-10-22 16:11:07,534 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:07,542 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:07,618 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:07,618 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:07,654 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:07,656 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:07,656 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44, 44, 44] total 86 [2018-10-22 16:11:07,656 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:07,656 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-22 16:11:07,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-22 16:11:07,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3331, Invalid=3979, Unknown=0, NotChecked=0, Total=7310 [2018-10-22 16:11:07,658 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand 44 states. [2018-10-22 16:11:07,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:07,883 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2018-10-22 16:11:07,884 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-22 16:11:07,884 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 128 [2018-10-22 16:11:07,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:07,888 INFO L225 Difference]: With dead ends: 138 [2018-10-22 16:11:07,888 INFO L226 Difference]: Without dead ends: 133 [2018-10-22 16:11:07,889 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 555 GetRequests, 468 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 396 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=3337, Invalid=4145, Unknown=0, NotChecked=0, Total=7482 [2018-10-22 16:11:07,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-10-22 16:11:07,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 132. [2018-10-22 16:11:07,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-10-22 16:11:07,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 132 transitions. [2018-10-22 16:11:07,893 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 132 transitions. Word has length 128 [2018-10-22 16:11:07,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:07,893 INFO L481 AbstractCegarLoop]: Abstraction has 132 states and 132 transitions. [2018-10-22 16:11:07,893 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-22 16:11:07,893 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 132 transitions. [2018-10-22 16:11:07,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-10-22 16:11:07,894 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:07,894 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:07,894 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:07,894 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:07,895 INFO L82 PathProgramCache]: Analyzing trace with hash -1989142275, now seen corresponding path program 40 times [2018-10-22 16:11:07,895 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:07,895 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:07,895 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:07,895 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:07,896 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:07,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:09,433 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:09,433 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:09,433 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:09,433 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:09,433 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:09,433 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:09,433 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:09,440 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:11:09,440 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:11:09,503 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:11:09,504 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:09,506 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:09,555 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:09,556 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:11,699 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:11,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:11,720 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 81 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:11,734 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:11:11,734 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:11:11,877 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:11:11,877 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:11,883 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:11,921 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:11,921 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:11,941 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:11,943 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:11,943 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45, 45, 45] total 88 [2018-10-22 16:11:11,943 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:11,943 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-22 16:11:11,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-22 16:11:11,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3496, Invalid=4160, Unknown=0, NotChecked=0, Total=7656 [2018-10-22 16:11:11,946 INFO L87 Difference]: Start difference. First operand 132 states and 132 transitions. Second operand 45 states. [2018-10-22 16:11:12,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:12,053 INFO L93 Difference]: Finished difference Result 141 states and 141 transitions. [2018-10-22 16:11:12,054 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-22 16:11:12,055 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 131 [2018-10-22 16:11:12,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:12,056 INFO L225 Difference]: With dead ends: 141 [2018-10-22 16:11:12,056 INFO L226 Difference]: Without dead ends: 136 [2018-10-22 16:11:12,057 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 568 GetRequests, 479 SyntacticMatches, 2 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3502, Invalid=4330, Unknown=0, NotChecked=0, Total=7832 [2018-10-22 16:11:12,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-10-22 16:11:12,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2018-10-22 16:11:12,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-10-22 16:11:12,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 135 transitions. [2018-10-22 16:11:12,061 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 135 transitions. Word has length 131 [2018-10-22 16:11:12,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:12,061 INFO L481 AbstractCegarLoop]: Abstraction has 135 states and 135 transitions. [2018-10-22 16:11:12,061 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-22 16:11:12,061 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 135 transitions. [2018-10-22 16:11:12,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-22 16:11:12,062 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:12,062 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:12,062 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:12,063 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:12,063 INFO L82 PathProgramCache]: Analyzing trace with hash -234471811, now seen corresponding path program 41 times [2018-10-22 16:11:12,063 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:12,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:12,063 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:12,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:12,064 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:12,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:13,669 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:13,669 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:13,669 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:13,669 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:13,670 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:13,670 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:13,670 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:13,677 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:11:13,677 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:13,763 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 42 check-sat command(s) [2018-10-22 16:11:13,763 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:13,766 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:13,824 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:13,824 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:15,828 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:15,848 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:15,848 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 83 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:15,863 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:11:15,863 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:16,579 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 42 check-sat command(s) [2018-10-22 16:11:16,579 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:16,586 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:16,645 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:16,645 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:16,670 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:16,672 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:16,672 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46, 46, 46] total 90 [2018-10-22 16:11:16,672 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:16,673 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-22 16:11:16,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-22 16:11:16,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3665, Invalid=4345, Unknown=0, NotChecked=0, Total=8010 [2018-10-22 16:11:16,674 INFO L87 Difference]: Start difference. First operand 135 states and 135 transitions. Second operand 46 states. [2018-10-22 16:11:17,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:17,403 INFO L93 Difference]: Finished difference Result 144 states and 144 transitions. [2018-10-22 16:11:17,404 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-22 16:11:17,404 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 134 [2018-10-22 16:11:17,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:17,405 INFO L225 Difference]: With dead ends: 144 [2018-10-22 16:11:17,405 INFO L226 Difference]: Without dead ends: 139 [2018-10-22 16:11:17,406 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 581 GetRequests, 490 SyntacticMatches, 2 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3671, Invalid=4519, Unknown=0, NotChecked=0, Total=8190 [2018-10-22 16:11:17,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-22 16:11:17,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 138. [2018-10-22 16:11:17,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-10-22 16:11:17,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 138 transitions. [2018-10-22 16:11:17,410 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 138 transitions. Word has length 134 [2018-10-22 16:11:17,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:17,410 INFO L481 AbstractCegarLoop]: Abstraction has 138 states and 138 transitions. [2018-10-22 16:11:17,410 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-22 16:11:17,411 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 138 transitions. [2018-10-22 16:11:17,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-22 16:11:17,411 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:17,411 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:17,412 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:17,412 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:17,412 INFO L82 PathProgramCache]: Analyzing trace with hash -893638403, now seen corresponding path program 42 times [2018-10-22 16:11:17,412 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:17,413 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:17,413 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:17,413 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:17,413 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:17,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:18,344 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:18,344 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:18,344 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:18,344 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:18,344 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:18,344 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:18,345 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:18,354 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:11:18,354 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:11:18,443 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 43 check-sat command(s) [2018-10-22 16:11:18,443 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:18,446 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:18,505 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:18,506 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:20,610 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:20,630 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:20,630 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 85 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:20,646 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:11:20,646 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:11:21,419 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 43 check-sat command(s) [2018-10-22 16:11:21,420 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:21,426 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:21,472 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:21,472 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:21,493 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:21,495 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:21,495 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47, 47, 47] total 92 [2018-10-22 16:11:21,496 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:21,496 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-22 16:11:21,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-22 16:11:21,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3838, Invalid=4534, Unknown=0, NotChecked=0, Total=8372 [2018-10-22 16:11:21,497 INFO L87 Difference]: Start difference. First operand 138 states and 138 transitions. Second operand 47 states. [2018-10-22 16:11:21,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:21,639 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2018-10-22 16:11:21,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-22 16:11:21,640 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 137 [2018-10-22 16:11:21,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:21,641 INFO L225 Difference]: With dead ends: 147 [2018-10-22 16:11:21,641 INFO L226 Difference]: Without dead ends: 142 [2018-10-22 16:11:21,641 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 594 GetRequests, 501 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 426 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3844, Invalid=4712, Unknown=0, NotChecked=0, Total=8556 [2018-10-22 16:11:21,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-22 16:11:21,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2018-10-22 16:11:21,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-22 16:11:21,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 141 transitions. [2018-10-22 16:11:21,646 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 141 transitions. Word has length 137 [2018-10-22 16:11:21,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:21,647 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 141 transitions. [2018-10-22 16:11:21,647 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-22 16:11:21,647 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 141 transitions. [2018-10-22 16:11:21,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-10-22 16:11:21,648 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:21,648 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:21,648 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:21,648 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:21,649 INFO L82 PathProgramCache]: Analyzing trace with hash -1535103363, now seen corresponding path program 43 times [2018-10-22 16:11:21,649 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:21,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:21,649 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:21,650 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:21,650 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:21,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:23,241 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:23,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:23,241 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:23,241 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:23,241 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:23,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:23,241 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:23,249 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:23,249 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:11:23,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:23,319 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:23,379 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:23,380 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:25,576 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:25,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:25,596 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 87 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:25,612 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:25,612 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:11:25,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:25,764 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:25,822 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:25,822 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:25,850 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:25,851 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:25,852 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48, 48, 48] total 94 [2018-10-22 16:11:25,852 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:25,852 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-22 16:11:25,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-22 16:11:25,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4015, Invalid=4727, Unknown=0, NotChecked=0, Total=8742 [2018-10-22 16:11:25,853 INFO L87 Difference]: Start difference. First operand 141 states and 141 transitions. Second operand 48 states. [2018-10-22 16:11:25,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:25,983 INFO L93 Difference]: Finished difference Result 150 states and 150 transitions. [2018-10-22 16:11:25,984 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-22 16:11:25,984 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 140 [2018-10-22 16:11:25,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:25,985 INFO L225 Difference]: With dead ends: 150 [2018-10-22 16:11:25,985 INFO L226 Difference]: Without dead ends: 145 [2018-10-22 16:11:25,986 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 607 GetRequests, 512 SyntacticMatches, 2 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 436 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=4021, Invalid=4909, Unknown=0, NotChecked=0, Total=8930 [2018-10-22 16:11:25,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-10-22 16:11:25,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 144. [2018-10-22 16:11:25,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-10-22 16:11:25,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 144 transitions. [2018-10-22 16:11:25,991 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 144 transitions. Word has length 140 [2018-10-22 16:11:25,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:25,991 INFO L481 AbstractCegarLoop]: Abstraction has 144 states and 144 transitions. [2018-10-22 16:11:25,991 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-22 16:11:25,991 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 144 transitions. [2018-10-22 16:11:25,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-10-22 16:11:25,992 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:25,992 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:25,993 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:25,993 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:25,993 INFO L82 PathProgramCache]: Analyzing trace with hash 1186740477, now seen corresponding path program 44 times [2018-10-22 16:11:25,993 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:25,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:25,994 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:25,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:25,994 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:26,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:27,267 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:27,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:27,267 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:27,267 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:27,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:27,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:27,267 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:27,275 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:11:27,275 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:27,341 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:11:27,341 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:27,344 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:27,404 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:27,404 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:29,711 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:29,732 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:29,732 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 89 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:29,747 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:11:29,747 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:29,890 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:11:29,890 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:29,896 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:29,953 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:29,954 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:29,982 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:29,984 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:29,984 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49, 49, 49] total 96 [2018-10-22 16:11:29,984 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:29,984 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-22 16:11:29,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-22 16:11:29,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4196, Invalid=4924, Unknown=0, NotChecked=0, Total=9120 [2018-10-22 16:11:29,985 INFO L87 Difference]: Start difference. First operand 144 states and 144 transitions. Second operand 49 states. [2018-10-22 16:11:30,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:30,092 INFO L93 Difference]: Finished difference Result 153 states and 153 transitions. [2018-10-22 16:11:30,092 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-22 16:11:30,093 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 143 [2018-10-22 16:11:30,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:30,094 INFO L225 Difference]: With dead ends: 153 [2018-10-22 16:11:30,094 INFO L226 Difference]: Without dead ends: 148 [2018-10-22 16:11:30,095 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 620 GetRequests, 523 SyntacticMatches, 2 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 446 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4202, Invalid=5110, Unknown=0, NotChecked=0, Total=9312 [2018-10-22 16:11:30,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-10-22 16:11:30,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2018-10-22 16:11:30,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-10-22 16:11:30,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 147 transitions. [2018-10-22 16:11:30,099 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 147 transitions. Word has length 143 [2018-10-22 16:11:30,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:30,100 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 147 transitions. [2018-10-22 16:11:30,100 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-22 16:11:30,100 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 147 transitions. [2018-10-22 16:11:30,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-10-22 16:11:30,101 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:30,101 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:30,101 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:30,101 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:30,101 INFO L82 PathProgramCache]: Analyzing trace with hash -1345970563, now seen corresponding path program 45 times [2018-10-22 16:11:30,102 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:30,102 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:30,102 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:30,102 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:30,102 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:30,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:31,061 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:31,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:31,062 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:31,062 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:31,062 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:31,062 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:31,062 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:31,072 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:11:31,072 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:11:31,174 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2018-10-22 16:11:31,174 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:31,176 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:31,240 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:31,240 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:33,793 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:33,813 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:33,813 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 91 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:33,827 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:11:33,828 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:11:34,713 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2018-10-22 16:11:34,713 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:34,721 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:34,785 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:34,785 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:34,812 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:34,814 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:34,814 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50, 50, 50] total 98 [2018-10-22 16:11:34,814 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:34,815 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-22 16:11:34,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-22 16:11:34,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4381, Invalid=5125, Unknown=0, NotChecked=0, Total=9506 [2018-10-22 16:11:34,816 INFO L87 Difference]: Start difference. First operand 147 states and 147 transitions. Second operand 50 states. [2018-10-22 16:11:34,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:34,931 INFO L93 Difference]: Finished difference Result 156 states and 156 transitions. [2018-10-22 16:11:34,931 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-22 16:11:34,932 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 146 [2018-10-22 16:11:34,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:34,933 INFO L225 Difference]: With dead ends: 156 [2018-10-22 16:11:34,933 INFO L226 Difference]: Without dead ends: 151 [2018-10-22 16:11:34,934 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 633 GetRequests, 534 SyntacticMatches, 2 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4387, Invalid=5315, Unknown=0, NotChecked=0, Total=9702 [2018-10-22 16:11:34,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-10-22 16:11:34,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 150. [2018-10-22 16:11:34,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-22 16:11:34,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 150 transitions. [2018-10-22 16:11:34,937 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 150 transitions. Word has length 146 [2018-10-22 16:11:34,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:34,938 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 150 transitions. [2018-10-22 16:11:34,938 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-22 16:11:34,938 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 150 transitions. [2018-10-22 16:11:34,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-10-22 16:11:34,938 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:34,939 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:34,939 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:34,939 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:34,939 INFO L82 PathProgramCache]: Analyzing trace with hash 644892925, now seen corresponding path program 46 times [2018-10-22 16:11:34,939 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:34,940 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:34,940 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:34,940 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:34,940 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:34,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:36,046 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:36,047 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:36,047 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:36,047 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:36,047 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:36,047 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:36,047 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:36,057 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:11:36,057 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:11:36,133 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:11:36,134 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:36,136 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:36,196 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:36,196 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:38,761 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:38,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:38,781 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 93 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 93 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:38,796 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:11:38,796 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:11:38,953 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:11:38,953 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:38,959 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:39,023 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:39,023 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:39,046 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:39,048 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:39,048 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51, 51, 51] total 100 [2018-10-22 16:11:39,048 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:39,048 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-22 16:11:39,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-22 16:11:39,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4570, Invalid=5330, Unknown=0, NotChecked=0, Total=9900 [2018-10-22 16:11:39,049 INFO L87 Difference]: Start difference. First operand 150 states and 150 transitions. Second operand 51 states. [2018-10-22 16:11:39,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:39,163 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2018-10-22 16:11:39,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-22 16:11:39,164 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 149 [2018-10-22 16:11:39,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:39,165 INFO L225 Difference]: With dead ends: 159 [2018-10-22 16:11:39,165 INFO L226 Difference]: Without dead ends: 154 [2018-10-22 16:11:39,166 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 646 GetRequests, 545 SyntacticMatches, 2 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 466 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4576, Invalid=5524, Unknown=0, NotChecked=0, Total=10100 [2018-10-22 16:11:39,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-10-22 16:11:39,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2018-10-22 16:11:39,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-10-22 16:11:39,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 153 transitions. [2018-10-22 16:11:39,171 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 153 transitions. Word has length 149 [2018-10-22 16:11:39,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:39,171 INFO L481 AbstractCegarLoop]: Abstraction has 153 states and 153 transitions. [2018-10-22 16:11:39,171 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-22 16:11:39,171 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 153 transitions. [2018-10-22 16:11:39,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2018-10-22 16:11:39,172 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:39,172 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:39,172 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:39,172 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:39,173 INFO L82 PathProgramCache]: Analyzing trace with hash 1255673469, now seen corresponding path program 47 times [2018-10-22 16:11:39,173 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:39,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:39,173 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:39,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:39,174 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:39,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:40,184 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:40,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:40,184 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:40,184 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:40,184 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:40,185 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:40,185 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:40,192 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:11:40,192 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:40,299 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 48 check-sat command(s) [2018-10-22 16:11:40,299 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:40,303 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:40,369 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:40,369 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:42,967 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:42,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:42,988 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 95 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 95 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:43,003 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:11:43,003 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:43,921 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 48 check-sat command(s) [2018-10-22 16:11:43,921 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:43,928 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:43,985 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:43,985 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:44,015 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:44,016 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:44,017 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52, 52, 52] total 102 [2018-10-22 16:11:44,017 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:44,017 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-22 16:11:44,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-22 16:11:44,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4763, Invalid=5539, Unknown=0, NotChecked=0, Total=10302 [2018-10-22 16:11:44,018 INFO L87 Difference]: Start difference. First operand 153 states and 153 transitions. Second operand 52 states. [2018-10-22 16:11:44,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:44,139 INFO L93 Difference]: Finished difference Result 162 states and 162 transitions. [2018-10-22 16:11:44,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-22 16:11:44,140 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 152 [2018-10-22 16:11:44,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:44,141 INFO L225 Difference]: With dead ends: 162 [2018-10-22 16:11:44,141 INFO L226 Difference]: Without dead ends: 157 [2018-10-22 16:11:44,142 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 659 GetRequests, 556 SyntacticMatches, 2 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 476 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4769, Invalid=5737, Unknown=0, NotChecked=0, Total=10506 [2018-10-22 16:11:44,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-22 16:11:44,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156. [2018-10-22 16:11:44,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-10-22 16:11:44,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 156 transitions. [2018-10-22 16:11:44,147 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 156 transitions. Word has length 152 [2018-10-22 16:11:44,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:44,147 INFO L481 AbstractCegarLoop]: Abstraction has 156 states and 156 transitions. [2018-10-22 16:11:44,147 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-22 16:11:44,147 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 156 transitions. [2018-10-22 16:11:44,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-10-22 16:11:44,148 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:44,148 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:44,148 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:44,148 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:44,149 INFO L82 PathProgramCache]: Analyzing trace with hash -757573379, now seen corresponding path program 48 times [2018-10-22 16:11:44,149 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:44,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:44,149 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:44,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:44,150 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:44,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:45,148 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:45,149 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:45,149 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:45,149 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:45,149 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:45,149 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:45,149 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:45,156 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:11:45,156 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:11:45,262 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 49 check-sat command(s) [2018-10-22 16:11:45,262 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:45,265 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:45,328 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:45,329 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:48,001 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:48,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:48,021 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 97 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 97 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:48,036 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:11:48,036 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:11:49,011 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 49 check-sat command(s) [2018-10-22 16:11:49,012 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:49,019 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:49,084 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:49,084 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:49,113 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:49,114 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:49,115 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53, 53, 53] total 104 [2018-10-22 16:11:49,115 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:49,115 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-22 16:11:49,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-22 16:11:49,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4960, Invalid=5752, Unknown=0, NotChecked=0, Total=10712 [2018-10-22 16:11:49,116 INFO L87 Difference]: Start difference. First operand 156 states and 156 transitions. Second operand 53 states. [2018-10-22 16:11:49,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:49,269 INFO L93 Difference]: Finished difference Result 165 states and 165 transitions. [2018-10-22 16:11:49,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-22 16:11:49,269 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 155 [2018-10-22 16:11:49,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:49,270 INFO L225 Difference]: With dead ends: 165 [2018-10-22 16:11:49,270 INFO L226 Difference]: Without dead ends: 160 [2018-10-22 16:11:49,271 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 672 GetRequests, 567 SyntacticMatches, 2 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 486 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4966, Invalid=5954, Unknown=0, NotChecked=0, Total=10920 [2018-10-22 16:11:49,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-10-22 16:11:49,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2018-10-22 16:11:49,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-10-22 16:11:49,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 159 transitions. [2018-10-22 16:11:49,274 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 159 transitions. Word has length 155 [2018-10-22 16:11:49,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:49,275 INFO L481 AbstractCegarLoop]: Abstraction has 159 states and 159 transitions. [2018-10-22 16:11:49,275 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-22 16:11:49,275 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 159 transitions. [2018-10-22 16:11:49,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-10-22 16:11:49,276 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:49,276 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:49,276 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:49,276 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:49,277 INFO L82 PathProgramCache]: Analyzing trace with hash 1823866493, now seen corresponding path program 49 times [2018-10-22 16:11:49,277 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:49,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:49,277 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:49,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:49,278 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:49,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:50,321 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:50,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:50,322 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:50,322 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:50,322 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:50,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:50,322 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:50,331 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:50,331 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:11:50,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:50,414 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:50,489 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:50,489 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:53,282 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:53,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:53,302 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 99 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 99 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:53,316 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:53,316 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:11:53,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:53,487 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:53,552 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:53,552 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:53,580 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:53,581 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:53,582 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54, 54, 54] total 106 [2018-10-22 16:11:53,582 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:53,582 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-22 16:11:53,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-22 16:11:53,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5161, Invalid=5969, Unknown=0, NotChecked=0, Total=11130 [2018-10-22 16:11:53,584 INFO L87 Difference]: Start difference. First operand 159 states and 159 transitions. Second operand 54 states. [2018-10-22 16:11:53,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:53,735 INFO L93 Difference]: Finished difference Result 168 states and 168 transitions. [2018-10-22 16:11:53,735 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-22 16:11:53,735 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 158 [2018-10-22 16:11:53,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:53,737 INFO L225 Difference]: With dead ends: 168 [2018-10-22 16:11:53,737 INFO L226 Difference]: Without dead ends: 163 [2018-10-22 16:11:53,738 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 685 GetRequests, 578 SyntacticMatches, 2 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=5167, Invalid=6175, Unknown=0, NotChecked=0, Total=11342 [2018-10-22 16:11:53,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-10-22 16:11:53,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 162. [2018-10-22 16:11:53,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-10-22 16:11:53,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 162 transitions. [2018-10-22 16:11:53,741 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 162 transitions. Word has length 158 [2018-10-22 16:11:53,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:53,741 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 162 transitions. [2018-10-22 16:11:53,741 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-22 16:11:53,741 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 162 transitions. [2018-10-22 16:11:53,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-10-22 16:11:53,742 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:53,742 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:53,743 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:53,743 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:53,743 INFO L82 PathProgramCache]: Analyzing trace with hash -185308931, now seen corresponding path program 50 times [2018-10-22 16:11:53,743 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:53,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:53,744 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:53,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:53,744 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:53,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:54,821 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:54,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:54,821 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:54,821 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:54,821 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:54,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:54,821 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:54,830 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:11:54,830 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:54,910 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:11:54,911 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:54,914 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:54,970 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:54,970 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:57,851 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:57,871 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:57,871 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 101 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 101 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:57,886 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:11:57,886 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:58,060 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:11:58,061 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:58,069 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:58,135 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:58,135 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:58,164 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:58,166 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:58,166 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55, 55, 55] total 108 [2018-10-22 16:11:58,166 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:58,167 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-22 16:11:58,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-22 16:11:58,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5366, Invalid=6190, Unknown=0, NotChecked=0, Total=11556 [2018-10-22 16:11:58,168 INFO L87 Difference]: Start difference. First operand 162 states and 162 transitions. Second operand 55 states. [2018-10-22 16:11:58,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:58,319 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2018-10-22 16:11:58,319 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-22 16:11:58,319 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 161 [2018-10-22 16:11:58,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:58,320 INFO L225 Difference]: With dead ends: 171 [2018-10-22 16:11:58,320 INFO L226 Difference]: Without dead ends: 166 [2018-10-22 16:11:58,321 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 589 SyntacticMatches, 2 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=5372, Invalid=6400, Unknown=0, NotChecked=0, Total=11772 [2018-10-22 16:11:58,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-10-22 16:11:58,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 165. [2018-10-22 16:11:58,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-10-22 16:11:58,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 165 transitions. [2018-10-22 16:11:58,324 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 165 transitions. Word has length 161 [2018-10-22 16:11:58,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:58,325 INFO L481 AbstractCegarLoop]: Abstraction has 165 states and 165 transitions. [2018-10-22 16:11:58,325 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-22 16:11:58,325 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 165 transitions. [2018-10-22 16:11:58,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-10-22 16:11:58,326 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:58,326 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:58,326 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:58,326 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:58,326 INFO L82 PathProgramCache]: Analyzing trace with hash -866128259, now seen corresponding path program 51 times [2018-10-22 16:11:58,327 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:58,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:58,327 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:58,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:58,327 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:58,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:59,428 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:59,429 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:59,429 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:59,429 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:59,429 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:59,429 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:59,429 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:59,437 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:11:59,437 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:11:59,557 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2018-10-22 16:11:59,558 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:59,561 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:59,668 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:59,668 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:02,617 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:02,637 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:02,637 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 103 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 103 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:02,652 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:12:02,652 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:12:03,732 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2018-10-22 16:12:03,732 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:03,740 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:03,811 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:03,812 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:03,863 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:03,864 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:03,865 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56, 56, 56] total 110 [2018-10-22 16:12:03,865 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:03,865 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-22 16:12:03,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-22 16:12:03,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5575, Invalid=6415, Unknown=0, NotChecked=0, Total=11990 [2018-10-22 16:12:03,867 INFO L87 Difference]: Start difference. First operand 165 states and 165 transitions. Second operand 56 states. [2018-10-22 16:12:04,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:04,023 INFO L93 Difference]: Finished difference Result 174 states and 174 transitions. [2018-10-22 16:12:04,024 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-22 16:12:04,024 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 164 [2018-10-22 16:12:04,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:04,025 INFO L225 Difference]: With dead ends: 174 [2018-10-22 16:12:04,025 INFO L226 Difference]: Without dead ends: 169 [2018-10-22 16:12:04,026 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 600 SyntacticMatches, 2 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 516 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=5581, Invalid=6629, Unknown=0, NotChecked=0, Total=12210 [2018-10-22 16:12:04,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-22 16:12:04,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 168. [2018-10-22 16:12:04,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-10-22 16:12:04,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 168 transitions. [2018-10-22 16:12:04,030 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 168 transitions. Word has length 164 [2018-10-22 16:12:04,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:04,030 INFO L481 AbstractCegarLoop]: Abstraction has 168 states and 168 transitions. [2018-10-22 16:12:04,030 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-10-22 16:12:04,030 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 168 transitions. [2018-10-22 16:12:04,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-10-22 16:12:04,031 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:04,031 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:04,031 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:04,031 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:04,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1975810301, now seen corresponding path program 52 times [2018-10-22 16:12:04,031 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:04,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:04,032 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:04,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:04,032 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:04,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:05,186 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:05,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:05,186 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:05,186 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:05,187 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:05,187 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:05,187 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:05,194 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:12:05,194 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:12:05,298 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:12:05,298 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:05,301 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:05,377 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:05,377 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:08,449 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:08,469 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:08,469 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 105 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 105 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:08,484 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:12:08,484 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:12:08,660 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:12:08,660 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:08,669 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:08,761 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:08,761 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:08,798 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:08,799 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:08,800 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57, 57, 57] total 112 [2018-10-22 16:12:08,800 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:08,800 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-22 16:12:08,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-22 16:12:08,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5788, Invalid=6644, Unknown=0, NotChecked=0, Total=12432 [2018-10-22 16:12:08,801 INFO L87 Difference]: Start difference. First operand 168 states and 168 transitions. Second operand 57 states. [2018-10-22 16:12:08,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:08,945 INFO L93 Difference]: Finished difference Result 177 states and 177 transitions. [2018-10-22 16:12:08,945 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-22 16:12:08,945 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 167 [2018-10-22 16:12:08,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:08,946 INFO L225 Difference]: With dead ends: 177 [2018-10-22 16:12:08,946 INFO L226 Difference]: Without dead ends: 172 [2018-10-22 16:12:08,947 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 724 GetRequests, 611 SyntacticMatches, 2 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=5794, Invalid=6862, Unknown=0, NotChecked=0, Total=12656 [2018-10-22 16:12:08,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-10-22 16:12:08,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2018-10-22 16:12:08,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-10-22 16:12:08,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 171 transitions. [2018-10-22 16:12:08,950 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 171 transitions. Word has length 167 [2018-10-22 16:12:08,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:08,950 INFO L481 AbstractCegarLoop]: Abstraction has 171 states and 171 transitions. [2018-10-22 16:12:08,950 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-22 16:12:08,950 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 171 transitions. [2018-10-22 16:12:08,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-10-22 16:12:08,951 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:08,951 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:08,951 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:08,951 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:08,951 INFO L82 PathProgramCache]: Analyzing trace with hash -522854787, now seen corresponding path program 53 times [2018-10-22 16:12:08,952 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:08,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:08,952 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:08,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:08,952 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:08,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:10,181 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:10,181 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:10,181 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:10,181 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:10,182 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:10,182 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:10,182 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:10,189 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:12:10,189 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:12:10,318 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 54 check-sat command(s) [2018-10-22 16:12:10,318 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:10,321 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:10,392 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:10,392 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:13,586 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:13,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:13,606 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 107 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 107 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:13,621 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:12:13,621 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:12:14,755 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 54 check-sat command(s) [2018-10-22 16:12:14,756 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:14,763 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:14,832 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:14,832 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:14,862 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:14,864 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:14,865 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58, 58, 58] total 114 [2018-10-22 16:12:14,865 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:14,866 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-22 16:12:14,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-22 16:12:14,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6005, Invalid=6877, Unknown=0, NotChecked=0, Total=12882 [2018-10-22 16:12:14,867 INFO L87 Difference]: Start difference. First operand 171 states and 171 transitions. Second operand 58 states. [2018-10-22 16:12:15,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:15,036 INFO L93 Difference]: Finished difference Result 180 states and 180 transitions. [2018-10-22 16:12:15,036 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-22 16:12:15,036 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 170 [2018-10-22 16:12:15,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:15,037 INFO L225 Difference]: With dead ends: 180 [2018-10-22 16:12:15,037 INFO L226 Difference]: Without dead ends: 175 [2018-10-22 16:12:15,038 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 737 GetRequests, 622 SyntacticMatches, 2 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 536 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=6011, Invalid=7099, Unknown=0, NotChecked=0, Total=13110 [2018-10-22 16:12:15,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-10-22 16:12:15,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 174. [2018-10-22 16:12:15,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-10-22 16:12:15,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 174 transitions. [2018-10-22 16:12:15,042 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 174 transitions. Word has length 170 [2018-10-22 16:12:15,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:15,042 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 174 transitions. [2018-10-22 16:12:15,042 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-22 16:12:15,042 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 174 transitions. [2018-10-22 16:12:15,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-10-22 16:12:15,043 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:15,043 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:15,044 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:15,044 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:15,044 INFO L82 PathProgramCache]: Analyzing trace with hash 2118682877, now seen corresponding path program 54 times [2018-10-22 16:12:15,044 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:15,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:15,045 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:15,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:15,045 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:15,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:16,277 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:16,277 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:16,277 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:16,277 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:16,277 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:16,277 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:16,277 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:16,289 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:12:16,289 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:12:16,414 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2018-10-22 16:12:16,415 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:16,418 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:16,491 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:16,491 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:19,806 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:19,828 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:19,828 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 109 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 109 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:19,843 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:12:19,843 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:12:21,052 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2018-10-22 16:12:21,052 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:21,060 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:21,141 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:21,141 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:21,176 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:21,178 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:21,178 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59, 59, 59] total 116 [2018-10-22 16:12:21,179 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:21,179 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-10-22 16:12:21,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-10-22 16:12:21,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6226, Invalid=7114, Unknown=0, NotChecked=0, Total=13340 [2018-10-22 16:12:21,180 INFO L87 Difference]: Start difference. First operand 174 states and 174 transitions. Second operand 59 states. [2018-10-22 16:12:21,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:21,353 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2018-10-22 16:12:21,353 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-22 16:12:21,353 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 173 [2018-10-22 16:12:21,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:21,354 INFO L225 Difference]: With dead ends: 183 [2018-10-22 16:12:21,354 INFO L226 Difference]: Without dead ends: 178 [2018-10-22 16:12:21,355 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 750 GetRequests, 633 SyntacticMatches, 2 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 546 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=6232, Invalid=7340, Unknown=0, NotChecked=0, Total=13572 [2018-10-22 16:12:21,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-10-22 16:12:21,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 177. [2018-10-22 16:12:21,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-22 16:12:21,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 177 transitions. [2018-10-22 16:12:21,359 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 177 transitions. Word has length 173 [2018-10-22 16:12:21,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:21,359 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 177 transitions. [2018-10-22 16:12:21,359 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-10-22 16:12:21,359 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 177 transitions. [2018-10-22 16:12:21,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-22 16:12:21,360 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:21,360 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:21,360 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:21,361 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:21,361 INFO L82 PathProgramCache]: Analyzing trace with hash -518533507, now seen corresponding path program 55 times [2018-10-22 16:12:21,361 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:21,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:21,361 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:21,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:21,361 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:21,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:22,686 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:22,687 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:22,687 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:22,687 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:22,687 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:22,687 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:22,687 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:22,694 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:12:22,694 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:12:22,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:22,785 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:22,999 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:23,000 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:26,377 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:26,398 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:26,398 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 111 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 111 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:26,412 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:12:26,412 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:12:26,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:26,603 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:26,674 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:26,674 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:26,704 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:26,706 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:26,706 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60, 60, 60] total 118 [2018-10-22 16:12:26,706 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:26,706 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-22 16:12:26,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-22 16:12:26,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6451, Invalid=7355, Unknown=0, NotChecked=0, Total=13806 [2018-10-22 16:12:26,707 INFO L87 Difference]: Start difference. First operand 177 states and 177 transitions. Second operand 60 states. [2018-10-22 16:12:26,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:26,862 INFO L93 Difference]: Finished difference Result 186 states and 186 transitions. [2018-10-22 16:12:26,863 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-10-22 16:12:26,863 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 176 [2018-10-22 16:12:26,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:26,864 INFO L225 Difference]: With dead ends: 186 [2018-10-22 16:12:26,864 INFO L226 Difference]: Without dead ends: 181 [2018-10-22 16:12:26,865 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 763 GetRequests, 644 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 556 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=6457, Invalid=7585, Unknown=0, NotChecked=0, Total=14042 [2018-10-22 16:12:26,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-10-22 16:12:26,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 180. [2018-10-22 16:12:26,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-10-22 16:12:26,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 180 transitions. [2018-10-22 16:12:26,869 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 180 transitions. Word has length 176 [2018-10-22 16:12:26,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:26,870 INFO L481 AbstractCegarLoop]: Abstraction has 180 states and 180 transitions. [2018-10-22 16:12:26,870 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-22 16:12:26,870 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 180 transitions. [2018-10-22 16:12:26,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-10-22 16:12:26,871 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:26,871 INFO L375 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:26,871 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:26,871 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:26,872 INFO L82 PathProgramCache]: Analyzing trace with hash 2004916477, now seen corresponding path program 56 times [2018-10-22 16:12:26,872 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:26,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:26,872 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:12:26,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:26,873 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:26,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:28,188 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:28,188 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:28,188 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:28,188 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:28,188 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:28,188 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:28,188 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:28,195 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:12:28,195 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:12:28,286 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:12:28,287 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:28,289 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:28,364 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:28,365 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:31,910 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:31,931 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:31,932 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 113 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 113 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:31,946 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:12:31,946 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:12:32,140 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:12:32,141 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:32,148 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:32,223 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:32,223 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:32,260 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:32,262 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:32,262 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61, 61, 61] total 120 [2018-10-22 16:12:32,262 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:32,262 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-22 16:12:32,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-22 16:12:32,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6680, Invalid=7600, Unknown=0, NotChecked=0, Total=14280 [2018-10-22 16:12:32,263 INFO L87 Difference]: Start difference. First operand 180 states and 180 transitions. Second operand 61 states. [2018-10-22 16:12:32,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:32,446 INFO L93 Difference]: Finished difference Result 189 states and 189 transitions. [2018-10-22 16:12:32,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-22 16:12:32,447 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 179 [2018-10-22 16:12:32,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:32,448 INFO L225 Difference]: With dead ends: 189 [2018-10-22 16:12:32,448 INFO L226 Difference]: Without dead ends: 184 [2018-10-22 16:12:32,449 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 776 GetRequests, 655 SyntacticMatches, 2 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=6686, Invalid=7834, Unknown=0, NotChecked=0, Total=14520 [2018-10-22 16:12:32,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-10-22 16:12:32,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 183. [2018-10-22 16:12:32,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-10-22 16:12:32,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 183 transitions. [2018-10-22 16:12:32,453 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 183 transitions. Word has length 179 [2018-10-22 16:12:32,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:32,453 INFO L481 AbstractCegarLoop]: Abstraction has 183 states and 183 transitions. [2018-10-22 16:12:32,453 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-22 16:12:32,453 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 183 transitions. [2018-10-22 16:12:32,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-10-22 16:12:32,454 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:32,454 INFO L375 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:32,455 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:32,455 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:32,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1004159363, now seen corresponding path program 57 times [2018-10-22 16:12:32,455 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:32,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:32,456 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:32,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:32,456 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:32,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:34,144 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:34,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:34,144 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:34,144 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:34,144 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:34,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:34,144 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:34,152 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:12:34,152 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:12:34,287 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 58 check-sat command(s) [2018-10-22 16:12:34,287 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:34,290 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:34,362 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:34,362 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:38,043 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:38,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:38,063 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 115 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 115 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:38,078 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:12:38,078 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:12:39,417 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 58 check-sat command(s) [2018-10-22 16:12:39,417 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:39,425 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:39,500 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:39,500 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:39,536 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:39,537 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:39,538 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62, 62, 62] total 122 [2018-10-22 16:12:39,538 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:39,538 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-10-22 16:12:39,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-10-22 16:12:39,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6913, Invalid=7849, Unknown=0, NotChecked=0, Total=14762 [2018-10-22 16:12:39,539 INFO L87 Difference]: Start difference. First operand 183 states and 183 transitions. Second operand 62 states. [2018-10-22 16:12:39,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:39,674 INFO L93 Difference]: Finished difference Result 192 states and 192 transitions. [2018-10-22 16:12:39,674 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-10-22 16:12:39,675 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 182 [2018-10-22 16:12:39,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:39,676 INFO L225 Difference]: With dead ends: 192 [2018-10-22 16:12:39,676 INFO L226 Difference]: Without dead ends: 187 [2018-10-22 16:12:39,677 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 789 GetRequests, 666 SyntacticMatches, 2 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 576 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=6919, Invalid=8087, Unknown=0, NotChecked=0, Total=15006 [2018-10-22 16:12:39,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-22 16:12:39,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 186. [2018-10-22 16:12:39,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-10-22 16:12:39,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 186 transitions. [2018-10-22 16:12:39,679 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 186 transitions. Word has length 182 [2018-10-22 16:12:39,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:39,680 INFO L481 AbstractCegarLoop]: Abstraction has 186 states and 186 transitions. [2018-10-22 16:12:39,680 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-10-22 16:12:39,680 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 186 transitions. [2018-10-22 16:12:39,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-10-22 16:12:39,681 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:39,681 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:39,681 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:39,681 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:39,681 INFO L82 PathProgramCache]: Analyzing trace with hash 174893309, now seen corresponding path program 58 times [2018-10-22 16:12:39,682 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:39,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:39,682 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:39,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:39,682 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:39,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:41,223 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:41,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:41,223 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:41,223 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:41,223 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:41,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:41,223 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:41,231 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:12:41,231 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:12:41,319 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:12:41,320 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:41,323 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:41,415 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:41,415 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:45,185 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:45,205 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:45,205 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 117 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 117 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:45,220 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:12:45,220 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:12:45,413 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:12:45,413 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:45,421 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:45,491 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:45,491 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:45,528 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:45,529 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:45,529 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63, 63, 63] total 124 [2018-10-22 16:12:45,529 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:45,530 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-22 16:12:45,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-22 16:12:45,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7150, Invalid=8102, Unknown=0, NotChecked=0, Total=15252 [2018-10-22 16:12:45,531 INFO L87 Difference]: Start difference. First operand 186 states and 186 transitions. Second operand 63 states. [2018-10-22 16:12:45,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:45,665 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2018-10-22 16:12:45,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-22 16:12:45,666 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 185 [2018-10-22 16:12:45,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:45,667 INFO L225 Difference]: With dead ends: 195 [2018-10-22 16:12:45,668 INFO L226 Difference]: Without dead ends: 190 [2018-10-22 16:12:45,669 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 802 GetRequests, 677 SyntacticMatches, 2 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 586 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=7156, Invalid=8344, Unknown=0, NotChecked=0, Total=15500 [2018-10-22 16:12:45,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-10-22 16:12:45,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 189. [2018-10-22 16:12:45,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-10-22 16:12:45,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 189 transitions. [2018-10-22 16:12:45,672 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 189 transitions. Word has length 185 [2018-10-22 16:12:45,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:45,673 INFO L481 AbstractCegarLoop]: Abstraction has 189 states and 189 transitions. [2018-10-22 16:12:45,673 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-22 16:12:45,673 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 189 transitions. [2018-10-22 16:12:45,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-10-22 16:12:45,674 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:45,674 INFO L375 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:45,674 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:45,674 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:45,674 INFO L82 PathProgramCache]: Analyzing trace with hash 1090498173, now seen corresponding path program 59 times [2018-10-22 16:12:45,674 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:45,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:45,675 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:45,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:45,675 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:45,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:47,803 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:47,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:47,804 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:47,804 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:47,804 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:47,804 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:47,804 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:47,812 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:12:47,812 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:12:47,952 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 60 check-sat command(s) [2018-10-22 16:12:47,952 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:47,956 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:48,033 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:48,033 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:51,867 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:51,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:51,887 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 119 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 119 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:51,902 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:12:51,903 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:12:53,260 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 60 check-sat command(s) [2018-10-22 16:12:53,261 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:53,270 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:53,353 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:53,353 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:53,400 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:53,401 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:53,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64, 64, 64] total 126 [2018-10-22 16:12:53,402 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:53,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-10-22 16:12:53,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-10-22 16:12:53,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7391, Invalid=8359, Unknown=0, NotChecked=0, Total=15750 [2018-10-22 16:12:53,403 INFO L87 Difference]: Start difference. First operand 189 states and 189 transitions. Second operand 64 states. [2018-10-22 16:12:53,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:53,605 INFO L93 Difference]: Finished difference Result 198 states and 198 transitions. [2018-10-22 16:12:53,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-10-22 16:12:53,605 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 188 [2018-10-22 16:12:53,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:53,607 INFO L225 Difference]: With dead ends: 198 [2018-10-22 16:12:53,607 INFO L226 Difference]: Without dead ends: 193 [2018-10-22 16:12:53,608 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 815 GetRequests, 688 SyntacticMatches, 2 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 596 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=7397, Invalid=8605, Unknown=0, NotChecked=0, Total=16002 [2018-10-22 16:12:53,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-10-22 16:12:53,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 192. [2018-10-22 16:12:53,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-10-22 16:12:53,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 192 transitions. [2018-10-22 16:12:53,612 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 192 transitions. Word has length 188 [2018-10-22 16:12:53,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:53,612 INFO L481 AbstractCegarLoop]: Abstraction has 192 states and 192 transitions. [2018-10-22 16:12:53,612 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-10-22 16:12:53,612 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 192 transitions. [2018-10-22 16:12:53,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-10-22 16:12:53,613 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:53,613 INFO L375 BasicCegarLoop]: trace histogram [61, 60, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:53,613 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:53,613 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:53,613 INFO L82 PathProgramCache]: Analyzing trace with hash 537704701, now seen corresponding path program 60 times [2018-10-22 16:12:53,614 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:53,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:53,614 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:53,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:53,614 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:53,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:55,028 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:55,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:55,029 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:55,029 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:55,029 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:55,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:55,029 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:55,036 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:12:55,036 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:12:55,176 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 61 check-sat command(s) [2018-10-22 16:12:55,176 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:55,179 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:55,259 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:55,259 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:59,280 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:59,300 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:59,300 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 121 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 121 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:59,315 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:12:59,315 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:13:00,769 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 61 check-sat command(s) [2018-10-22 16:13:00,769 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:00,776 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:00,839 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:00,839 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:00,877 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:00,879 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:13:00,879 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65, 65, 65] total 128 [2018-10-22 16:13:00,879 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:13:00,879 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-10-22 16:13:00,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-10-22 16:13:00,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7636, Invalid=8620, Unknown=0, NotChecked=0, Total=16256 [2018-10-22 16:13:00,880 INFO L87 Difference]: Start difference. First operand 192 states and 192 transitions. Second operand 65 states. [2018-10-22 16:13:01,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:13:01,039 INFO L93 Difference]: Finished difference Result 201 states and 201 transitions. [2018-10-22 16:13:01,039 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-22 16:13:01,039 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 191 [2018-10-22 16:13:01,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:13:01,040 INFO L225 Difference]: With dead ends: 201 [2018-10-22 16:13:01,040 INFO L226 Difference]: Without dead ends: 196 [2018-10-22 16:13:01,041 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 828 GetRequests, 699 SyntacticMatches, 2 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 606 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=7642, Invalid=8870, Unknown=0, NotChecked=0, Total=16512 [2018-10-22 16:13:01,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-10-22 16:13:01,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 195. [2018-10-22 16:13:01,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-10-22 16:13:01,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 195 transitions. [2018-10-22 16:13:01,045 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 195 transitions. Word has length 191 [2018-10-22 16:13:01,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:13:01,045 INFO L481 AbstractCegarLoop]: Abstraction has 195 states and 195 transitions. [2018-10-22 16:13:01,046 INFO L482 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-10-22 16:13:01,046 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 195 transitions. [2018-10-22 16:13:01,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-10-22 16:13:01,047 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:13:01,047 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:13:01,047 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:13:01,047 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:13:01,047 INFO L82 PathProgramCache]: Analyzing trace with hash -828006787, now seen corresponding path program 61 times [2018-10-22 16:13:01,048 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:13:01,048 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:01,048 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:13:01,048 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:01,048 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:13:01,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:13:02,561 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:02,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:02,561 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:13:02,561 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:13:02,561 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:13:02,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:02,561 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:13:02,569 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:13:02,570 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:13:02,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:13:02,671 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:02,757 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:02,757 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:06,907 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:06,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:06,929 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 123 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 123 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:13:06,944 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:13:06,944 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:13:07,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:13:07,157 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:07,226 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:07,227 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:07,268 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:07,269 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:13:07,270 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66, 66, 66] total 130 [2018-10-22 16:13:07,270 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:13:07,270 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-22 16:13:07,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-22 16:13:07,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7885, Invalid=8885, Unknown=0, NotChecked=0, Total=16770 [2018-10-22 16:13:07,271 INFO L87 Difference]: Start difference. First operand 195 states and 195 transitions. Second operand 66 states. [2018-10-22 16:13:07,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:13:07,437 INFO L93 Difference]: Finished difference Result 204 states and 204 transitions. [2018-10-22 16:13:07,437 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-10-22 16:13:07,437 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 194 [2018-10-22 16:13:07,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:13:07,438 INFO L225 Difference]: With dead ends: 204 [2018-10-22 16:13:07,438 INFO L226 Difference]: Without dead ends: 199 [2018-10-22 16:13:07,438 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 841 GetRequests, 710 SyntacticMatches, 2 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 616 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=7891, Invalid=9139, Unknown=0, NotChecked=0, Total=17030 [2018-10-22 16:13:07,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-22 16:13:07,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 198. [2018-10-22 16:13:07,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-10-22 16:13:07,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 198 transitions. [2018-10-22 16:13:07,442 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 198 transitions. Word has length 194 [2018-10-22 16:13:07,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:13:07,443 INFO L481 AbstractCegarLoop]: Abstraction has 198 states and 198 transitions. [2018-10-22 16:13:07,443 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-22 16:13:07,443 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 198 transitions. [2018-10-22 16:13:07,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-10-22 16:13:07,444 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:13:07,444 INFO L375 BasicCegarLoop]: trace histogram [63, 62, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:13:07,444 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:13:07,444 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:13:07,444 INFO L82 PathProgramCache]: Analyzing trace with hash -513750787, now seen corresponding path program 62 times [2018-10-22 16:13:07,445 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:13:07,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:07,445 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:13:07,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:07,445 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:13:07,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:13:09,104 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:09,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:09,104 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:13:09,104 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:13:09,105 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:13:09,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:09,105 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:13:09,112 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:13:09,112 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:13:09,211 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:13:09,211 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:09,214 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:09,294 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:09,294 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:13,555 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:13,575 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:13,575 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 125 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 125 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:13:13,595 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:13:13,595 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:13:13,801 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:13:13,801 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:13,808 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:13,866 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:13,867 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:13,903 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:13,905 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:13:13,905 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67, 67, 67] total 132 [2018-10-22 16:13:13,905 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:13:13,906 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-22 16:13:13,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-22 16:13:13,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8138, Invalid=9154, Unknown=0, NotChecked=0, Total=17292 [2018-10-22 16:13:13,908 INFO L87 Difference]: Start difference. First operand 198 states and 198 transitions. Second operand 67 states. [2018-10-22 16:13:14,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:13:14,131 INFO L93 Difference]: Finished difference Result 207 states and 207 transitions. [2018-10-22 16:13:14,131 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-22 16:13:14,131 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 197 [2018-10-22 16:13:14,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:13:14,132 INFO L225 Difference]: With dead ends: 207 [2018-10-22 16:13:14,132 INFO L226 Difference]: Without dead ends: 202 [2018-10-22 16:13:14,133 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 854 GetRequests, 721 SyntacticMatches, 2 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 626 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=8144, Invalid=9412, Unknown=0, NotChecked=0, Total=17556 [2018-10-22 16:13:14,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2018-10-22 16:13:14,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 201. [2018-10-22 16:13:14,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-10-22 16:13:14,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 201 transitions. [2018-10-22 16:13:14,137 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 201 transitions. Word has length 197 [2018-10-22 16:13:14,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:13:14,137 INFO L481 AbstractCegarLoop]: Abstraction has 201 states and 201 transitions. [2018-10-22 16:13:14,137 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-22 16:13:14,137 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 201 transitions. [2018-10-22 16:13:14,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-10-22 16:13:14,138 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:13:14,138 INFO L375 BasicCegarLoop]: trace histogram [64, 63, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:13:14,139 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:13:14,139 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:13:14,139 INFO L82 PathProgramCache]: Analyzing trace with hash -1541960067, now seen corresponding path program 63 times [2018-10-22 16:13:14,139 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:13:14,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:14,140 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:13:14,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:14,140 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:13:14,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:13:15,740 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:15,740 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:15,740 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:13:15,740 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:13:15,740 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:13:15,740 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:15,740 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:13:15,749 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:13:15,749 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:13:16,012 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 64 check-sat command(s) [2018-10-22 16:13:16,013 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:16,016 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:16,097 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:16,097 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:20,519 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:20,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:20,540 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 127 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 127 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:13:20,554 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:13:20,554 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:13:22,153 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 64 check-sat command(s) [2018-10-22 16:13:22,153 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:22,163 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:22,246 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:22,246 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:22,289 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:22,291 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:13:22,291 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68, 68, 68] total 134 [2018-10-22 16:13:22,291 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:13:22,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-10-22 16:13:22,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-10-22 16:13:22,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8395, Invalid=9427, Unknown=0, NotChecked=0, Total=17822 [2018-10-22 16:13:22,292 INFO L87 Difference]: Start difference. First operand 201 states and 201 transitions. Second operand 68 states. [2018-10-22 16:13:22,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:13:22,522 INFO L93 Difference]: Finished difference Result 210 states and 210 transitions. [2018-10-22 16:13:22,522 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-10-22 16:13:22,522 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 200 [2018-10-22 16:13:22,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:13:22,523 INFO L225 Difference]: With dead ends: 210 [2018-10-22 16:13:22,523 INFO L226 Difference]: Without dead ends: 205 [2018-10-22 16:13:22,524 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 867 GetRequests, 732 SyntacticMatches, 2 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 636 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=8401, Invalid=9689, Unknown=0, NotChecked=0, Total=18090 [2018-10-22 16:13:22,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-10-22 16:13:22,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 204. [2018-10-22 16:13:22,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2018-10-22 16:13:22,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 204 transitions. [2018-10-22 16:13:22,529 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 204 transitions. Word has length 200 [2018-10-22 16:13:22,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:13:22,529 INFO L481 AbstractCegarLoop]: Abstraction has 204 states and 204 transitions. [2018-10-22 16:13:22,529 INFO L482 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-10-22 16:13:22,529 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 204 transitions. [2018-10-22 16:13:22,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2018-10-22 16:13:22,530 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:13:22,530 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:13:22,530 INFO L424 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:13:22,530 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:13:22,530 INFO L82 PathProgramCache]: Analyzing trace with hash -1217865475, now seen corresponding path program 64 times [2018-10-22 16:13:22,530 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:13:22,531 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:22,531 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:13:22,531 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:22,531 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:13:22,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:13:24,186 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:24,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:24,186 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:13:24,186 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:13:24,187 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:13:24,187 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:24,187 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 128 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 128 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:13:24,197 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:13:24,197 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:13:24,299 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:13:24,299 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:24,302 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:24,388 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:24,388 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:28,934 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:28,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:28,954 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 129 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 129 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:13:28,969 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:13:28,970 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:13:29,193 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:13:29,194 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:29,204 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:29,287 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:29,287 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:29,356 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:29,358 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:13:29,358 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69, 69, 69] total 136 [2018-10-22 16:13:29,358 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:13:29,359 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-22 16:13:29,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-22 16:13:29,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8656, Invalid=9704, Unknown=0, NotChecked=0, Total=18360 [2018-10-22 16:13:29,360 INFO L87 Difference]: Start difference. First operand 204 states and 204 transitions. Second operand 69 states. [2018-10-22 16:13:29,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:13:29,599 INFO L93 Difference]: Finished difference Result 213 states and 213 transitions. [2018-10-22 16:13:29,599 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-22 16:13:29,599 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 203 [2018-10-22 16:13:29,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:13:29,600 INFO L225 Difference]: With dead ends: 213 [2018-10-22 16:13:29,600 INFO L226 Difference]: Without dead ends: 208 [2018-10-22 16:13:29,600 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 880 GetRequests, 743 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 646 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=8662, Invalid=9970, Unknown=0, NotChecked=0, Total=18632 [2018-10-22 16:13:29,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2018-10-22 16:13:29,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 207. [2018-10-22 16:13:29,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-10-22 16:13:29,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 207 transitions. [2018-10-22 16:13:29,604 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 207 transitions. Word has length 203 [2018-10-22 16:13:29,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:13:29,604 INFO L481 AbstractCegarLoop]: Abstraction has 207 states and 207 transitions. [2018-10-22 16:13:29,604 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-22 16:13:29,605 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 207 transitions. [2018-10-22 16:13:29,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-10-22 16:13:29,605 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:13:29,605 INFO L375 BasicCegarLoop]: trace histogram [66, 65, 65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:13:29,606 INFO L424 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:13:29,606 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:13:29,606 INFO L82 PathProgramCache]: Analyzing trace with hash -1202356611, now seen corresponding path program 65 times [2018-10-22 16:13:29,606 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:13:29,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:29,607 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:13:29,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:29,607 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:13:29,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:13:31,281 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:31,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:31,282 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:13:31,282 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:13:31,282 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:13:31,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:31,282 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 130 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 130 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:13:31,306 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:13:31,306 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:13:31,467 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 66 check-sat command(s) [2018-10-22 16:13:31,467 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:31,471 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:31,552 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:31,552 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:36,246 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:36,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:36,267 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 131 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 131 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:13:36,281 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:13:36,282 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:13:37,948 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 66 check-sat command(s) [2018-10-22 16:13:37,948 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:37,957 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:38,037 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:38,037 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:38,074 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:38,076 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:13:38,076 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70, 70, 70] total 138 [2018-10-22 16:13:38,076 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:13:38,076 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-22 16:13:38,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-22 16:13:38,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8921, Invalid=9985, Unknown=0, NotChecked=0, Total=18906 [2018-10-22 16:13:38,078 INFO L87 Difference]: Start difference. First operand 207 states and 207 transitions. Second operand 70 states. [2018-10-22 16:13:38,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:13:38,259 INFO L93 Difference]: Finished difference Result 216 states and 216 transitions. [2018-10-22 16:13:38,260 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-22 16:13:38,260 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 206 [2018-10-22 16:13:38,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:13:38,261 INFO L225 Difference]: With dead ends: 216 [2018-10-22 16:13:38,262 INFO L226 Difference]: Without dead ends: 211 [2018-10-22 16:13:38,262 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 893 GetRequests, 754 SyntacticMatches, 2 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 656 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=8927, Invalid=10255, Unknown=0, NotChecked=0, Total=19182 [2018-10-22 16:13:38,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-10-22 16:13:38,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 210. [2018-10-22 16:13:38,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-10-22 16:13:38,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 210 transitions. [2018-10-22 16:13:38,267 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 210 transitions. Word has length 206 [2018-10-22 16:13:38,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:13:38,267 INFO L481 AbstractCegarLoop]: Abstraction has 210 states and 210 transitions. [2018-10-22 16:13:38,267 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-22 16:13:38,267 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 210 transitions. [2018-10-22 16:13:38,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-10-22 16:13:38,268 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:13:38,269 INFO L375 BasicCegarLoop]: trace histogram [67, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:13:38,269 INFO L424 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:13:38,269 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:13:38,269 INFO L82 PathProgramCache]: Analyzing trace with hash 1260710141, now seen corresponding path program 66 times [2018-10-22 16:13:38,269 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:13:38,270 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:38,270 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:13:38,270 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:38,270 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:13:38,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Received shutdown request... [2018-10-22 16:13:38,979 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-22 16:13:38,983 WARN L205 ceAbstractionStarter]: Timeout [2018-10-22 16:13:38,983 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 04:13:38 BoogieIcfgContainer [2018-10-22 16:13:38,983 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-22 16:13:38,984 INFO L168 Benchmark]: Toolchain (without parser) took 234504.10 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 634.9 MB). Free memory was 1.4 GB in the beginning and 2.0 GB in the end (delta: -603.8 MB). Peak memory consumption was 31.1 MB. Max. memory is 7.1 GB. [2018-10-22 16:13:38,985 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:13:38,985 INFO L168 Benchmark]: CACSL2BoogieTranslator took 316.19 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-22 16:13:38,985 INFO L168 Benchmark]: Boogie Procedure Inliner took 21.85 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:13:38,985 INFO L168 Benchmark]: Boogie Preprocessor took 24.95 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:13:38,986 INFO L168 Benchmark]: RCFGBuilder took 354.76 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 738.7 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -778.5 MB). Peak memory consumption was 26.7 MB. Max. memory is 7.1 GB. [2018-10-22 16:13:38,986 INFO L168 Benchmark]: TraceAbstraction took 233781.60 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -103.8 MB). Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 164.1 MB). Peak memory consumption was 60.3 MB. Max. memory is 7.1 GB. [2018-10-22 16:13:38,987 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 316.19 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 21.85 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 24.95 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 354.76 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 738.7 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -778.5 MB). Peak memory consumption was 26.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 233781.60 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -103.8 MB). Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 164.1 MB). Peak memory consumption was 60.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 210 with TraceHistMax 67,while InterpolatingTraceCheckCraig was constructing Craig interpolants,while PredicateComparison was comparing new predicate (quantifier-free) to 43 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. TIMEOUT Result, 233.7s OverallTime, 68 OverallIterations, 67 TraceHistogramMax, 9.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 747 SDtfs, 2275 SDslu, 15643 SDs, 0 SdLazy, 3971 SolverSat, 107 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 31007 GetRequests, 26136 SyntacticMatches, 132 SemanticMatches, 4739 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21826 ImplicationChecksByTransitivity, 180.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=210occurred in iteration=67, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.5s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 67 MinimizatonAttempts, 65 StatesRemovedByMinimization, 65 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 1.4s SsaConstructionTime, 29.0s SatisfiabilityAnalysisTime, 188.0s InterpolantComputationTime, 21471 NumberOfCodeBlocks, 21471 NumberOfCodeBlocksAsserted, 2397 NumberOfCheckSat, 35444 ConstructedInterpolants, 0 QuantifiedInterpolants, 14346644 SizeOfPredicates, 262 NumberOfNonLiveVariables, 54730 ConjunctsInSsa, 5192 ConjunctsInUnsatCore, 327 InterpolantComputations, 2 PerfectInterpolantSequences, 0/707850 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown