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-acceleration/diamond_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:00:22,992 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:00:22,994 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:00:23,006 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:00:23,006 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:00:23,007 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:00:23,009 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:00:23,010 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:00:23,012 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:00:23,013 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:00:23,014 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:00:23,014 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:00:23,015 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:00:23,016 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:00:23,017 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:00:23,018 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:00:23,019 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:00:23,021 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:00:23,023 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:00:23,027 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:00:23,030 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:00:23,031 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:00:23,037 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-22 16:00:23,053 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 16:00:23,086 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:00:23,086 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:00:23,087 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:00:23,087 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:00:23,087 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:00:23,087 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:00:23,087 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:00:23,088 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:00:23,088 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:00:23,089 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:00:23,089 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:00:23,089 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:00:23,090 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:00:23,093 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:00:23,093 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:00:23,093 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:00:23,094 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:00:23,094 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:00:23,094 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:00:23,094 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:00:23,094 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:00:23,095 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:00:23,095 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:00:23,095 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:00:23,095 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:00:23,095 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:00:23,096 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:00:23,096 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:00:23,096 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:00:23,096 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:00:23,096 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:00:23,097 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:00:23,097 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:00:23,097 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:00:23,139 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:00:23,157 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:00:23,160 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:00:23,162 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:00:23,162 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:00:23,163 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/diamond_false-unreach-call1.i [2018-10-22 16:00:23,214 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/819bd1eae/15c114a6ef11418a819aeac398f2157e/FLAG0b4d5529f [2018-10-22 16:00:23,678 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:00:23,679 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_false-unreach-call1.i [2018-10-22 16:00:23,685 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/819bd1eae/15c114a6ef11418a819aeac398f2157e/FLAG0b4d5529f [2018-10-22 16:00:23,700 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/819bd1eae/15c114a6ef11418a819aeac398f2157e [2018-10-22 16:00:23,712 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:00:23,714 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:00:23,715 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:00:23,715 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:00:23,719 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:00:23,720 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:00:23" (1/1) ... [2018-10-22 16:00:23,723 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22d35362 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:23, skipping insertion in model container [2018-10-22 16:00:23,723 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:00:23" (1/1) ... [2018-10-22 16:00:23,732 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:00:23,750 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:00:23,985 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:00:23,991 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:00:24,013 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:00:24,031 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:00:24,032 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:24 WrapperNode [2018-10-22 16:00:24,032 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:00:24,033 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:00:24,033 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:00:24,033 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:00:24,044 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:24" (1/1) ... [2018-10-22 16:00:24,050 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:24" (1/1) ... [2018-10-22 16:00:24,057 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:00:24,058 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:00:24,058 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:00:24,058 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:00:24,069 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:24" (1/1) ... [2018-10-22 16:00:24,070 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:24" (1/1) ... [2018-10-22 16:00:24,070 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:24" (1/1) ... [2018-10-22 16:00:24,071 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:24" (1/1) ... [2018-10-22 16:00:24,075 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:24" (1/1) ... [2018-10-22 16:00:24,084 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:24" (1/1) ... [2018-10-22 16:00:24,086 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:24" (1/1) ... [2018-10-22 16:00:24,087 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:00:24,090 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:00:24,090 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:00:24,090 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:00:24,092 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:24" (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 16:00:24,230 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:00:24,230 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:00:24,230 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:00:24,230 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:00:24,230 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:00:24,231 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:00:24,231 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:00:24,231 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:00:24,454 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:00:24,455 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:00:24 BoogieIcfgContainer [2018-10-22 16:00:24,455 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:00:24,456 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:00:24,456 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:00:24,460 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:00:24,460 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:00:23" (1/3) ... [2018-10-22 16:00:24,461 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31d79aa7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:00:24, skipping insertion in model container [2018-10-22 16:00:24,461 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:24" (2/3) ... [2018-10-22 16:00:24,462 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31d79aa7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:00:24, skipping insertion in model container [2018-10-22 16:00:24,462 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:00:24" (3/3) ... [2018-10-22 16:00:24,464 INFO L112 eAbstractionObserver]: Analyzing ICFG diamond_false-unreach-call1.i [2018-10-22 16:00:24,473 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:00:24,480 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:00:24,494 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:00:24,529 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:00:24,530 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:00:24,530 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:00:24,530 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:00:24,530 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:00:24,531 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:00:24,531 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:00:24,531 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:00:24,531 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:00:24,551 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-10-22 16:00:24,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-22 16:00:24,558 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:24,559 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:24,561 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:24,567 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:24,567 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-10-22 16:00:24,569 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:24,617 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:24,618 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:24,618 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:24,618 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:24,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:24,693 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 16:00:24,696 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:00:24,696 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:00:24,697 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:00:24,702 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:00:24,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:00:24,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:00:24,722 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-10-22 16:00:24,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:24,759 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-22 16:00:24,759 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:00:24,760 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-22 16:00:24,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:24,772 INFO L225 Difference]: With dead ends: 30 [2018-10-22 16:00:24,772 INFO L226 Difference]: Without dead ends: 13 [2018-10-22 16:00:24,777 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 16:00:24,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-22 16:00:24,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-22 16:00:24,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-22 16:00:24,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-10-22 16:00:24,814 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-10-22 16:00:24,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:24,815 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-10-22 16:00:24,815 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:00:24,815 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-10-22 16:00:24,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 16:00:24,816 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:24,816 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:24,816 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:24,817 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:24,817 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-10-22 16:00:24,817 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:24,818 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:24,819 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:24,819 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:24,819 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:24,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:25,010 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 16:00:25,011 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:00:25,011 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:00:25,015 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:00:25,019 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:00:25,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:00:25,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:00:25,024 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-10-22 16:00:25,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:25,118 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2018-10-22 16:00:25,119 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:00:25,119 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-22 16:00:25,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:25,122 INFO L225 Difference]: With dead ends: 21 [2018-10-22 16:00:25,123 INFO L226 Difference]: Without dead ends: 16 [2018-10-22 16:00:25,124 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:00:25,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-22 16:00:25,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-10-22 16:00:25,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-22 16:00:25,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-10-22 16:00:25,131 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2018-10-22 16:00:25,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:25,132 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-10-22 16:00:25,132 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:00:25,132 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-10-22 16:00:25,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-22 16:00:25,133 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:25,133 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:25,134 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:25,134 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:25,134 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-10-22 16:00:25,135 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:25,136 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:25,137 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:25,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:25,137 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:25,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:25,284 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 16:00:25,284 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:25,284 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:25,285 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-22 16:00:25,287 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [26], [29], [31], [37], [38], [39], [41] [2018-10-22 16:00:25,337 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:00:25,337 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:00:25,456 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:00:25,987 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:00:25,990 INFO L272 AbstractInterpreter]: Visited 13 different actions 77 times. Merged at 4 different actions 34 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-10-22 16:00:26,038 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:26,040 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:00:26,040 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:26,040 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 16:00:26,057 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:26,058 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:26,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:26,108 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:26,149 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 16:00:26,149 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:26,293 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 16:00:26,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:26,315 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 16:00:26,334 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:26,334 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:26,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:26,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:26,413 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 16:00:26,413 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:26,457 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 16:00:26,461 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:26,461 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-10-22 16:00:26,461 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:26,462 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-22 16:00:26,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-22 16:00:26,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:00:26,463 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 4 states. [2018-10-22 16:00:26,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:26,573 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2018-10-22 16:00:26,574 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 16:00:26,574 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-22 16:00:26,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:26,575 INFO L225 Difference]: With dead ends: 24 [2018-10-22 16:00:26,575 INFO L226 Difference]: Without dead ends: 19 [2018-10-22 16:00:26,576 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:00:26,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-22 16:00:26,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2018-10-22 16:00:26,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-22 16:00:26,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-10-22 16:00:26,580 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-10-22 16:00:26,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:26,581 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-10-22 16:00:26,581 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-22 16:00:26,581 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-10-22 16:00:26,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-22 16:00:26,582 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:26,582 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:26,582 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:26,583 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:26,583 INFO L82 PathProgramCache]: Analyzing trace with hash -281914435, now seen corresponding path program 1 times [2018-10-22 16:00:26,583 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:26,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:26,584 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:26,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:26,584 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:26,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:26,762 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 16:00:26,762 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:26,762 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:26,763 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-22 16:00:26,763 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-22 16:00:26,769 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:00:26,770 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:00:26,778 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:00:27,042 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:00:27,043 INFO L272 AbstractInterpreter]: Visited 13 different actions 77 times. Merged at 4 different actions 34 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-22 16:00:27,082 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:27,082 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:00:27,082 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:27,083 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) [2018-10-22 16:00:27,099 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:27,099 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:27,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:27,128 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:27,203 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 16:00:27,204 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:27,481 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 16:00:27,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:27,518 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 16:00:27,548 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:27,548 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:27,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:27,571 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:27,644 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 16:00:27,645 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:27,702 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 16:00:27,706 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:27,706 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-10-22 16:00:27,706 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:27,707 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-22 16:00:27,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-22 16:00:27,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:00:27,707 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 4 states. [2018-10-22 16:00:27,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:27,881 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2018-10-22 16:00:27,881 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 16:00:27,882 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-22 16:00:27,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:27,883 INFO L225 Difference]: With dead ends: 26 [2018-10-22 16:00:27,883 INFO L226 Difference]: Without dead ends: 21 [2018-10-22 16:00:27,883 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:00:27,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-22 16:00:27,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2018-10-22 16:00:27,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-22 16:00:27,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-10-22 16:00:27,888 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-10-22 16:00:27,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:27,888 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-10-22 16:00:27,888 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-22 16:00:27,889 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-10-22 16:00:27,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 16:00:27,889 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:27,890 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:27,890 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:27,890 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:27,890 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-10-22 16:00:27,890 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:27,891 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:27,891 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:27,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:27,892 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:27,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:28,086 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 16:00:28,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:28,086 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:28,087 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:28,087 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:28,087 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:28,087 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 16:00:28,103 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:28,103 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:28,114 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:28,115 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:28,116 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:28,140 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 16:00:28,140 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:28,224 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 16:00:28,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:28,248 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 16:00:28,263 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:28,264 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:28,291 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:28,292 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:28,297 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:28,330 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 16:00:28,330 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:28,388 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 16:00:28,390 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:28,391 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-10-22 16:00:28,391 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:28,391 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 16:00:28,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 16:00:28,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:00:28,392 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2018-10-22 16:00:28,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:28,513 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2018-10-22 16:00:28,515 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:00:28,516 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-22 16:00:28,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:28,517 INFO L225 Difference]: With dead ends: 29 [2018-10-22 16:00:28,517 INFO L226 Difference]: Without dead ends: 24 [2018-10-22 16:00:28,518 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:00:28,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-22 16:00:28,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2018-10-22 16:00:28,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-22 16:00:28,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2018-10-22 16:00:28,524 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 17 [2018-10-22 16:00:28,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:28,525 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2018-10-22 16:00:28,525 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 16:00:28,525 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2018-10-22 16:00:28,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 16:00:28,525 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:28,526 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:28,526 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:28,526 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:28,526 INFO L82 PathProgramCache]: Analyzing trace with hash -849134272, now seen corresponding path program 1 times [2018-10-22 16:00:28,526 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:28,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:28,528 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:28,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:28,528 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:28,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:28,612 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 16:00:28,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:28,613 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:28,613 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 18 with the following transitions: [2018-10-22 16:00:28,613 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-22 16:00:28,615 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:00:28,615 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:00:28,619 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:00:28,818 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:00:28,818 INFO L272 AbstractInterpreter]: Visited 14 different actions 87 times. Merged at 5 different actions 34 times. Widened at 2 different actions 5 times. Found 11 fixpoints after 2 different actions. Largest state had 4 variables. [2018-10-22 16:00:28,858 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:28,858 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:00:28,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:28,859 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 16:00:28,873 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:28,873 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:28,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:28,902 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:29,167 WARN L179 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 5 [2018-10-22 16:00:29,186 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:29,187 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:29,379 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:29,411 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-22 16:00:29,412 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 6 [2018-10-22 16:00:29,412 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:00:29,412 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:00:29,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:00:29,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:00:29,413 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand 3 states. [2018-10-22 16:00:29,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:29,467 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2018-10-22 16:00:29,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:00:29,469 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-10-22 16:00:29,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:29,470 INFO L225 Difference]: With dead ends: 35 [2018-10-22 16:00:29,471 INFO L226 Difference]: Without dead ends: 27 [2018-10-22 16:00:29,471 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:00:29,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-22 16:00:29,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-22 16:00:29,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-22 16:00:29,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2018-10-22 16:00:29,483 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 17 [2018-10-22 16:00:29,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:29,483 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2018-10-22 16:00:29,483 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:00:29,483 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2018-10-22 16:00:29,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 16:00:29,484 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:29,485 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:29,487 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:29,487 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:29,488 INFO L82 PathProgramCache]: Analyzing trace with hash 1277798652, now seen corresponding path program 2 times [2018-10-22 16:00:29,488 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:29,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:29,489 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:29,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:29,489 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:29,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:29,703 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 16:00:29,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:29,703 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:29,704 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:29,704 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:29,704 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:29,704 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:29,713 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:29,713 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:29,748 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:29,748 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:29,750 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:29,842 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:29,842 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:29,962 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:29,997 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-22 16:00:29,997 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 6 [2018-10-22 16:00:29,998 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:00:29,998 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:00:29,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:00:29,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:00:29,999 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 3 states. [2018-10-22 16:00:30,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:30,051 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-10-22 16:00:30,055 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:00:30,058 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-10-22 16:00:30,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:30,059 INFO L225 Difference]: With dead ends: 35 [2018-10-22 16:00:30,059 INFO L226 Difference]: Without dead ends: 27 [2018-10-22 16:00:30,060 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:00:30,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-22 16:00:30,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-22 16:00:30,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-22 16:00:30,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2018-10-22 16:00:30,065 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 17 [2018-10-22 16:00:30,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:30,068 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2018-10-22 16:00:30,068 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:00:30,068 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2018-10-22 16:00:30,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 16:00:30,069 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:30,069 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:30,069 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:30,069 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:30,069 INFO L82 PathProgramCache]: Analyzing trace with hash -1242161282, now seen corresponding path program 2 times [2018-10-22 16:00:30,070 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:30,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:30,071 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:30,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:30,071 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:30,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:30,393 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 16:00:30,394 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:30,394 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:30,394 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:30,394 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:30,394 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:30,394 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 16:00:30,402 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:30,402 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:30,436 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:30,437 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:30,438 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:30,450 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 16:00:30,450 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:30,623 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 16:00:30,645 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:30,645 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 16:00:30,663 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:30,663 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:30,692 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:30,693 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:30,696 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:30,718 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 16:00:30,718 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:30,752 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 16:00:30,759 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:30,760 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-10-22 16:00:30,760 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:30,761 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 16:00:30,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 16:00:30,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:00:30,762 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 5 states. [2018-10-22 16:00:30,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:30,839 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2018-10-22 16:00:30,840 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:00:30,841 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-22 16:00:30,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:30,841 INFO L225 Difference]: With dead ends: 35 [2018-10-22 16:00:30,841 INFO L226 Difference]: Without dead ends: 30 [2018-10-22 16:00:30,842 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:00:30,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-22 16:00:30,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-22 16:00:30,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-22 16:00:30,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2018-10-22 16:00:30,847 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 17 [2018-10-22 16:00:30,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:30,848 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2018-10-22 16:00:30,848 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 16:00:30,848 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2018-10-22 16:00:30,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-22 16:00:30,849 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:30,849 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:30,849 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:30,849 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:30,849 INFO L82 PathProgramCache]: Analyzing trace with hash 26004059, now seen corresponding path program 3 times [2018-10-22 16:00:30,850 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:30,850 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:30,851 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:30,851 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:30,851 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:30,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:30,995 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 16:00:30,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:30,995 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:30,996 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:30,996 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:30,996 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:30,996 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 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 16:00:31,009 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:31,009 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:31,021 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:00:31,021 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:31,023 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:31,050 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 16:00:31,050 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:31,403 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 16:00:31,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:31,423 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 16:00:31,438 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:31,438 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:31,513 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:00:31,514 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:31,518 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:31,547 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 16:00:31,547 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:31,552 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 16:00:31,554 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:31,554 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-10-22 16:00:31,554 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:31,555 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 16:00:31,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 16:00:31,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:00:31,555 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 6 states. [2018-10-22 16:00:31,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:31,648 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2018-10-22 16:00:31,651 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 16:00:31,651 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-22 16:00:31,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:31,652 INFO L225 Difference]: With dead ends: 38 [2018-10-22 16:00:31,652 INFO L226 Difference]: Without dead ends: 33 [2018-10-22 16:00:31,653 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:00:31,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-22 16:00:31,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-10-22 16:00:31,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-22 16:00:31,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2018-10-22 16:00:31,658 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 20 [2018-10-22 16:00:31,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:31,659 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2018-10-22 16:00:31,659 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 16:00:31,659 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2018-10-22 16:00:31,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-22 16:00:31,660 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:31,660 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:31,660 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:31,661 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:31,661 INFO L82 PathProgramCache]: Analyzing trace with hash 821178397, now seen corresponding path program 3 times [2018-10-22 16:00:31,661 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:31,662 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:31,662 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:31,662 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:31,662 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:31,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:32,138 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 16:00:32,138 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:32,138 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:32,139 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:32,139 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:32,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:32,139 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 16:00:32,148 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:32,148 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:32,160 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:00:32,161 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:32,163 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:32,171 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 16:00:32,171 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:32,493 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 16:00:32,514 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:32,514 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 16:00:32,530 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:32,530 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:32,573 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:00:32,573 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:32,576 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:32,624 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 16:00:32,624 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:32,659 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 16:00:32,660 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:32,661 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-10-22 16:00:32,661 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:32,661 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 16:00:32,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 16:00:32,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:00:32,663 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 6 states. [2018-10-22 16:00:32,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:32,736 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2018-10-22 16:00:32,736 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 16:00:32,736 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-22 16:00:32,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:32,737 INFO L225 Difference]: With dead ends: 41 [2018-10-22 16:00:32,737 INFO L226 Difference]: Without dead ends: 36 [2018-10-22 16:00:32,737 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:00:32,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-22 16:00:32,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-10-22 16:00:32,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-22 16:00:32,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2018-10-22 16:00:32,744 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 20 [2018-10-22 16:00:32,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:32,745 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2018-10-22 16:00:32,745 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 16:00:32,745 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2018-10-22 16:00:32,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-22 16:00:32,746 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:32,746 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:32,746 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:32,746 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:32,746 INFO L82 PathProgramCache]: Analyzing trace with hash 427509150, now seen corresponding path program 4 times [2018-10-22 16:00:32,747 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:32,747 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:32,748 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:32,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:32,748 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:32,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:33,084 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 16:00:33,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:33,084 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:33,084 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:33,085 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:33,085 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:33,085 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 16:00:33,093 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:33,093 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:33,105 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:33,105 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:33,108 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:33,134 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 16:00:33,135 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:33,552 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 16:00:33,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:33,573 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 16:00:33,588 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:33,589 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:33,612 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:33,612 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:33,615 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:33,625 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 16:00:33,625 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:33,637 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 16:00:33,638 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:33,638 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-10-22 16:00:33,639 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:33,639 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 16:00:33,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 16:00:33,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:00:33,640 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 7 states. [2018-10-22 16:00:33,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:33,752 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2018-10-22 16:00:33,756 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 16:00:33,756 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-22 16:00:33,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:33,757 INFO L225 Difference]: With dead ends: 44 [2018-10-22 16:00:33,757 INFO L226 Difference]: Without dead ends: 39 [2018-10-22 16:00:33,758 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 85 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:00:33,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-22 16:00:33,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-22 16:00:33,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-22 16:00:33,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-10-22 16:00:33,763 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 23 [2018-10-22 16:00:33,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:33,764 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-10-22 16:00:33,764 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 16:00:33,764 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-10-22 16:00:33,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-22 16:00:33,765 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:33,765 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:33,765 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:33,765 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:33,766 INFO L82 PathProgramCache]: Analyzing trace with hash 201615134, now seen corresponding path program 4 times [2018-10-22 16:00:33,766 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:33,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:33,767 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:33,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:33,767 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:33,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:34,387 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 16:00:34,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:34,388 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:34,388 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:34,388 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:34,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:34,389 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 16:00:34,399 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:34,399 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:34,417 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:34,417 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:34,418 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:34,440 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 16:00:34,440 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:34,735 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 16:00:34,755 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:34,755 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 16:00:34,770 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:34,770 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:34,792 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:34,792 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:34,795 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:34,813 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 16:00:34,813 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:34,818 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 16:00:34,822 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:34,822 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-10-22 16:00:34,822 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:34,823 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 16:00:34,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 16:00:34,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:00:34,824 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 7 states. [2018-10-22 16:00:34,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:34,967 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2018-10-22 16:00:34,971 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 16:00:34,971 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-22 16:00:34,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:34,972 INFO L225 Difference]: With dead ends: 47 [2018-10-22 16:00:34,972 INFO L226 Difference]: Without dead ends: 42 [2018-10-22 16:00:34,973 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 85 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:00:34,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-22 16:00:34,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-10-22 16:00:34,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-22 16:00:34,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2018-10-22 16:00:34,980 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 23 [2018-10-22 16:00:34,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:34,980 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2018-10-22 16:00:34,980 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 16:00:34,980 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2018-10-22 16:00:34,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-22 16:00:34,981 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:34,981 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:34,982 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:34,982 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:34,982 INFO L82 PathProgramCache]: Analyzing trace with hash 181755771, now seen corresponding path program 5 times [2018-10-22 16:00:34,982 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:34,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:34,983 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:34,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:34,983 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:34,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:35,193 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 16:00:35,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:35,194 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:35,194 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:35,194 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:35,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:35,194 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 16:00:35,203 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:35,203 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:35,256 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:00:35,256 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:35,258 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:35,277 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 16:00:35,278 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:35,791 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 16:00:35,811 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:35,811 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 16:00:35,827 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:35,828 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:35,893 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:00:35,893 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:35,896 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:35,927 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 16:00:35,927 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:35,938 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 16:00:35,940 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:35,940 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-10-22 16:00:35,940 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:35,941 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 16:00:35,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 16:00:35,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:00:35,941 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 8 states. [2018-10-22 16:00:36,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:36,162 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2018-10-22 16:00:36,163 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:00:36,163 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-22 16:00:36,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:36,164 INFO L225 Difference]: With dead ends: 50 [2018-10-22 16:00:36,164 INFO L226 Difference]: Without dead ends: 45 [2018-10-22 16:00:36,164 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:00:36,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-22 16:00:36,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-10-22 16:00:36,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-22 16:00:36,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2018-10-22 16:00:36,169 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 26 [2018-10-22 16:00:36,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:36,170 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2018-10-22 16:00:36,170 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 16:00:36,170 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2018-10-22 16:00:36,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-22 16:00:36,171 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:36,171 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:36,171 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:36,172 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:36,172 INFO L82 PathProgramCache]: Analyzing trace with hash -1733081987, now seen corresponding path program 5 times [2018-10-22 16:00:36,172 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:36,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:36,173 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:36,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:36,173 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:36,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:36,305 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 16:00:36,305 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:36,305 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:36,306 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:36,306 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:36,306 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:36,306 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 16:00:36,319 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:36,320 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:36,386 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:00:36,387 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:36,388 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:36,406 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 16:00:36,406 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:37,304 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 16:00:37,326 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:37,326 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 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 16:00:37,341 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:37,341 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:37,426 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:00:37,426 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:37,430 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:37,498 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 16:00:37,498 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:37,556 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 16:00:37,558 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:37,558 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-10-22 16:00:37,558 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:37,559 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 16:00:37,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 16:00:37,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:00:37,559 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 8 states. [2018-10-22 16:00:38,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:38,174 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2018-10-22 16:00:38,174 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:00:38,175 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-22 16:00:38,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:38,176 INFO L225 Difference]: With dead ends: 53 [2018-10-22 16:00:38,176 INFO L226 Difference]: Without dead ends: 48 [2018-10-22 16:00:38,177 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:00:38,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-22 16:00:38,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2018-10-22 16:00:38,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-22 16:00:38,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2018-10-22 16:00:38,183 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 26 [2018-10-22 16:00:38,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:38,184 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2018-10-22 16:00:38,184 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 16:00:38,184 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2018-10-22 16:00:38,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-22 16:00:38,185 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:38,185 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:38,185 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:38,185 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:38,185 INFO L82 PathProgramCache]: Analyzing trace with hash 1862081662, now seen corresponding path program 6 times [2018-10-22 16:00:38,186 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:38,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:38,186 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:38,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:38,187 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:38,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:38,318 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 16:00:38,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:38,318 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:38,318 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:38,318 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:38,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:38,318 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 16:00:38,326 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:00:38,326 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:00:38,365 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:00:38,365 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:38,366 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:38,380 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 16:00:38,380 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:38,984 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 16:00:39,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:39,005 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 16:00:39,020 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:00:39,020 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:00:39,202 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:00:39,202 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:39,207 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:39,277 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 16:00:39,277 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:39,331 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 16:00:39,334 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:39,334 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 16 [2018-10-22 16:00:39,334 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:39,335 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 16:00:39,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 16:00:39,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-22 16:00:39,335 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 9 states. [2018-10-22 16:00:39,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:39,575 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2018-10-22 16:00:39,575 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:00:39,575 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-22 16:00:39,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:39,576 INFO L225 Difference]: With dead ends: 56 [2018-10-22 16:00:39,576 INFO L226 Difference]: Without dead ends: 51 [2018-10-22 16:00:39,577 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 107 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-22 16:00:39,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-22 16:00:39,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2018-10-22 16:00:39,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-22 16:00:39,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2018-10-22 16:00:39,585 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 29 [2018-10-22 16:00:39,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:39,585 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2018-10-22 16:00:39,585 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 16:00:39,585 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2018-10-22 16:00:39,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-22 16:00:39,586 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:39,586 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:39,586 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:39,587 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:39,587 INFO L82 PathProgramCache]: Analyzing trace with hash 166098622, now seen corresponding path program 6 times [2018-10-22 16:00:39,587 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:39,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:39,588 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:39,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:39,588 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:39,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:39,727 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 16:00:39,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:39,728 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:39,728 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:39,728 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:39,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:39,728 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 16:00:39,737 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:00:39,737 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:00:39,779 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:00:39,780 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:39,781 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:39,827 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 16:00:39,828 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:42,310 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 16:00:42,344 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:42,344 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 16:00:42,366 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:00:42,366 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:00:42,457 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:00:42,457 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:42,460 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:42,483 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 16:00:42,484 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:45,517 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 16:00:45,518 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:45,519 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 10, 9, 9] total 22 [2018-10-22 16:00:45,519 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:45,519 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 16:00:45,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 16:00:45,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=309, Unknown=0, NotChecked=0, Total=462 [2018-10-22 16:00:45,520 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 9 states. [2018-10-22 16:00:45,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:45,695 INFO L93 Difference]: Finished difference Result 59 states and 61 transitions. [2018-10-22 16:00:45,696 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:00:45,696 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-22 16:00:45,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:45,697 INFO L225 Difference]: With dead ends: 59 [2018-10-22 16:00:45,697 INFO L226 Difference]: Without dead ends: 54 [2018-10-22 16:00:45,698 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 100 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=153, Invalid=309, Unknown=0, NotChecked=0, Total=462 [2018-10-22 16:00:45,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-22 16:00:45,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-10-22 16:00:45,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-22 16:00:45,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2018-10-22 16:00:45,704 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 29 [2018-10-22 16:00:45,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:45,704 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2018-10-22 16:00:45,704 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 16:00:45,704 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2018-10-22 16:00:45,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-22 16:00:45,705 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:45,705 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:45,706 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:45,706 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:45,706 INFO L82 PathProgramCache]: Analyzing trace with hash -1688101733, now seen corresponding path program 7 times [2018-10-22 16:00:45,706 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:45,707 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:45,707 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:45,707 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:45,707 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:45,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:45,922 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 16:00:45,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:45,922 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:45,922 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:45,922 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:45,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:45,922 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 16:00:45,930 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:45,930 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:45,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:45,944 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:45,957 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 16:00:45,958 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:46,552 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 16:00:46,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:46,574 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 16:00:46,589 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:46,589 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:46,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:46,620 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:46,640 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 16:00:46,640 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:46,682 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 16:00:46,684 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:46,684 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-10-22 16:00:46,684 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:46,684 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:00:46,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:00:46,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:00:46,685 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 10 states. [2018-10-22 16:00:46,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:46,825 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2018-10-22 16:00:46,826 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:00:46,826 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-22 16:00:46,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:46,827 INFO L225 Difference]: With dead ends: 62 [2018-10-22 16:00:46,827 INFO L226 Difference]: Without dead ends: 57 [2018-10-22 16:00:46,828 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 118 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:00:46,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-22 16:00:46,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2018-10-22 16:00:46,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-22 16:00:46,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2018-10-22 16:00:46,840 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 32 [2018-10-22 16:00:46,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:46,841 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2018-10-22 16:00:46,842 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:00:46,842 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2018-10-22 16:00:46,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-22 16:00:46,843 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:46,843 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:46,843 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:46,843 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:46,843 INFO L82 PathProgramCache]: Analyzing trace with hash 1051431133, now seen corresponding path program 7 times [2018-10-22 16:00:46,843 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:46,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:46,844 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:46,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:46,844 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:46,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:47,049 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 16:00:47,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:47,050 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:47,050 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:47,050 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:47,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:47,050 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 16:00:47,058 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:47,059 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:47,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:47,070 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:47,079 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 16:00:47,079 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:48,437 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 16:00:48,457 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:48,457 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 16:00:48,472 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:48,473 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:48,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:48,498 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:48,510 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 16:00:48,510 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:48,519 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 16:00:48,520 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:48,520 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-10-22 16:00:48,521 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:48,521 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:00:48,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:00:48,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:00:48,522 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 10 states. [2018-10-22 16:00:48,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:48,651 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2018-10-22 16:00:48,652 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:00:48,652 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-22 16:00:48,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:48,653 INFO L225 Difference]: With dead ends: 65 [2018-10-22 16:00:48,653 INFO L226 Difference]: Without dead ends: 60 [2018-10-22 16:00:48,654 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 118 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:00:48,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-22 16:00:48,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2018-10-22 16:00:48,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-22 16:00:48,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2018-10-22 16:00:48,660 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 32 [2018-10-22 16:00:48,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:48,660 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2018-10-22 16:00:48,661 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:00:48,661 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2018-10-22 16:00:48,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-22 16:00:48,662 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:48,662 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:48,662 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:48,662 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:48,662 INFO L82 PathProgramCache]: Analyzing trace with hash -1631958178, now seen corresponding path program 8 times [2018-10-22 16:00:48,663 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:48,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:48,663 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:48,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:48,664 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:48,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:48,878 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 16:00:48,878 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:48,879 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:48,879 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:48,879 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:48,879 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:48,879 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 16:00:48,889 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:48,889 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:48,912 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:48,912 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:48,914 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:48,922 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 16:00:48,922 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:50,733 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 16:00:50,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:50,753 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 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 16:00:50,771 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:50,772 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:50,814 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:50,814 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:50,818 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:50,863 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 16:00:50,864 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:50,876 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 16:00:50,877 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:50,878 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-10-22 16:00:50,878 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:50,878 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 16:00:50,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 16:00:50,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:00:50,879 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 11 states. [2018-10-22 16:00:51,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:51,092 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2018-10-22 16:00:51,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 16:00:51,093 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-10-22 16:00:51,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:51,094 INFO L225 Difference]: With dead ends: 68 [2018-10-22 16:00:51,094 INFO L226 Difference]: Without dead ends: 63 [2018-10-22 16:00:51,095 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 129 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:00:51,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-22 16:00:51,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2018-10-22 16:00:51,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-22 16:00:51,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2018-10-22 16:00:51,100 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 35 [2018-10-22 16:00:51,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:51,100 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2018-10-22 16:00:51,100 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 16:00:51,100 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2018-10-22 16:00:51,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-22 16:00:51,101 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:51,101 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:51,101 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:51,102 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:51,102 INFO L82 PathProgramCache]: Analyzing trace with hash 598101598, now seen corresponding path program 8 times [2018-10-22 16:00:51,102 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:51,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:51,103 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:51,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:51,103 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:51,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:51,314 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 16:00:51,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:51,315 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:51,315 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:51,315 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:51,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:51,316 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 16:00:51,323 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:51,323 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:51,334 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:51,334 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:51,335 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:51,341 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 16:00:51,341 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:52,770 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 16:00:52,790 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:52,791 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 16:00:52,806 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:52,806 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:52,840 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:52,840 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:52,843 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:52,858 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 16:00:52,858 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:52,891 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 16:00:52,893 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:52,893 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-10-22 16:00:52,893 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:52,893 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 16:00:52,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 16:00:52,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:00:52,894 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 11 states. [2018-10-22 16:00:53,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:53,091 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2018-10-22 16:00:53,091 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 16:00:53,092 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-10-22 16:00:53,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:53,093 INFO L225 Difference]: With dead ends: 71 [2018-10-22 16:00:53,093 INFO L226 Difference]: Without dead ends: 66 [2018-10-22 16:00:53,094 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 129 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:00:53,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-22 16:00:53,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2018-10-22 16:00:53,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-22 16:00:53,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2018-10-22 16:00:53,099 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 35 [2018-10-22 16:00:53,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:53,099 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2018-10-22 16:00:53,099 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 16:00:53,099 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2018-10-22 16:00:53,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-22 16:00:53,100 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:53,100 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:53,100 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:53,101 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:53,101 INFO L82 PathProgramCache]: Analyzing trace with hash 198410683, now seen corresponding path program 9 times [2018-10-22 16:00:53,101 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:53,102 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:53,102 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:53,102 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:53,102 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:53,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:53,758 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 16:00:53,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:53,759 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:53,759 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:53,759 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:53,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:53,759 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 16:00:53,766 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:53,767 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:54,092 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:00:54,092 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:54,094 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:54,195 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 16:00:54,195 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:55,414 WARN L179 SmtUtils]: Spent 668.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:00:56,378 WARN L179 SmtUtils]: Spent 299.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:00:56,390 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 16:00:56,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:56,410 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 16:00:56,426 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:56,426 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:56,679 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:00:56,679 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:56,682 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:56,692 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 16:00:56,692 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:00,463 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 16:01:00,464 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:00,464 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 13, 12, 12] total 31 [2018-10-22 16:01:00,465 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:00,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 16:01:00,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 16:01:00,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=636, Unknown=0, NotChecked=0, Total=930 [2018-10-22 16:01:00,466 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand 12 states. [2018-10-22 16:01:00,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:00,671 INFO L93 Difference]: Finished difference Result 74 states and 76 transitions. [2018-10-22 16:01:00,672 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 16:01:00,672 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-10-22 16:01:00,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:00,673 INFO L225 Difference]: With dead ends: 74 [2018-10-22 16:01:00,673 INFO L226 Difference]: Without dead ends: 69 [2018-10-22 16:01:00,674 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 128 SyntacticMatches, 6 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=294, Invalid=636, Unknown=0, NotChecked=0, Total=930 [2018-10-22 16:01:00,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-22 16:01:00,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2018-10-22 16:01:00,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-10-22 16:01:00,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2018-10-22 16:01:00,679 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 38 [2018-10-22 16:01:00,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:00,679 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2018-10-22 16:01:00,680 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 16:01:00,680 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2018-10-22 16:01:00,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-22 16:01:00,680 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:00,681 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:00,681 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:00,681 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:00,681 INFO L82 PathProgramCache]: Analyzing trace with hash -1164896963, now seen corresponding path program 9 times [2018-10-22 16:01:00,681 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:00,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:00,682 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:00,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:00,682 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:00,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:00,932 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 16:01:00,933 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:00,933 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:00,933 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:00,933 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:00,933 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:00,933 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 16:01:00,940 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:01:00,940 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:01:01,204 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:01:01,204 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:01,206 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:01,230 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 16:01:01,230 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:04,254 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 16:01:04,274 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:04,274 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 16:01:04,289 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:01:04,289 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:01:04,416 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:01:04,416 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:04,420 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:04,475 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 16:01:04,475 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:04,488 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 16:01:04,489 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:04,489 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 22 [2018-10-22 16:01:04,489 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:04,489 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 16:01:04,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 16:01:04,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-22 16:01:04,490 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 12 states. [2018-10-22 16:01:04,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:04,674 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2018-10-22 16:01:04,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 16:01:04,675 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-10-22 16:01:04,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:04,676 INFO L225 Difference]: With dead ends: 77 [2018-10-22 16:01:04,677 INFO L226 Difference]: Without dead ends: 72 [2018-10-22 16:01:04,677 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 140 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-22 16:01:04,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-22 16:01:04,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2018-10-22 16:01:04,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-10-22 16:01:04,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2018-10-22 16:01:04,681 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 38 [2018-10-22 16:01:04,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:04,681 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2018-10-22 16:01:04,681 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 16:01:04,682 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2018-10-22 16:01:04,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-22 16:01:04,682 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:04,682 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:04,682 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:04,683 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:04,683 INFO L82 PathProgramCache]: Analyzing trace with hash -187641282, now seen corresponding path program 10 times [2018-10-22 16:01:04,683 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:04,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:04,684 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:04,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:04,684 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:04,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:05,065 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:05,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:05,066 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:05,066 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:05,066 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:05,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:05,066 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 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 16:01:05,078 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:01:05,078 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:01:05,092 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:01:05,092 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:05,093 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:05,100 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 16:01:05,101 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:09,176 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 16:01:09,196 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:09,196 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 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 16:01:09,211 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:01:09,211 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:01:09,247 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:01:09,247 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:09,250 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:09,259 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 16:01:09,259 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:09,311 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 16:01:09,313 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:09,314 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-10-22 16:01:09,314 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:09,314 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 16:01:09,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 16:01:09,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:01:09,315 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand 13 states. [2018-10-22 16:01:09,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:09,593 INFO L93 Difference]: Finished difference Result 80 states and 82 transitions. [2018-10-22 16:01:09,593 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 16:01:09,593 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-10-22 16:01:09,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:09,594 INFO L225 Difference]: With dead ends: 80 [2018-10-22 16:01:09,594 INFO L226 Difference]: Without dead ends: 75 [2018-10-22 16:01:09,595 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 151 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:01:09,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-22 16:01:09,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2018-10-22 16:01:09,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-22 16:01:09,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2018-10-22 16:01:09,599 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 41 [2018-10-22 16:01:09,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:09,599 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2018-10-22 16:01:09,599 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 16:01:09,599 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2018-10-22 16:01:09,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-22 16:01:09,600 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:09,600 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:09,600 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:09,601 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:09,601 INFO L82 PathProgramCache]: Analyzing trace with hash 500035070, now seen corresponding path program 10 times [2018-10-22 16:01:09,601 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:09,601 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:09,602 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:09,602 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:09,602 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:09,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:09,798 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 16:01:09,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:09,799 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:09,799 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:09,799 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:09,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:09,799 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 16:01:09,807 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:01:09,807 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:01:09,817 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:01:09,817 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:09,818 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:09,864 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 16:01:09,864 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:12,214 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 16:01:12,234 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:12,234 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 16:01:12,250 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:01:12,250 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:01:12,284 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:01:12,284 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:12,288 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:12,314 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 16:01:12,314 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:12,337 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 16:01:12,338 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:12,338 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-10-22 16:01:12,338 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:12,338 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 16:01:12,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 16:01:12,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:01:12,339 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 13 states. [2018-10-22 16:01:12,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:12,627 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2018-10-22 16:01:12,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 16:01:12,628 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-10-22 16:01:12,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:12,629 INFO L225 Difference]: With dead ends: 83 [2018-10-22 16:01:12,629 INFO L226 Difference]: Without dead ends: 78 [2018-10-22 16:01:12,630 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 151 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:01:12,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-22 16:01:12,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2018-10-22 16:01:12,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-22 16:01:12,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2018-10-22 16:01:12,634 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 41 [2018-10-22 16:01:12,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:12,634 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2018-10-22 16:01:12,635 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 16:01:12,635 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2018-10-22 16:01:12,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-22 16:01:12,635 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:12,635 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:12,635 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:12,635 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:12,636 INFO L82 PathProgramCache]: Analyzing trace with hash 860688091, now seen corresponding path program 11 times [2018-10-22 16:01:12,636 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:12,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:12,636 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:12,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:12,637 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:12,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:13,482 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 16:01:13,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:13,482 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:13,482 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:13,483 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:13,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:13,483 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 16:01:13,490 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:01:13,490 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:14,013 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 16:01:14,014 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:14,031 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:14,039 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 16:01:14,039 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:17,292 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 16:01:17,312 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:17,312 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 16:01:17,332 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:01:17,332 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:17,507 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 16:01:17,507 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:17,510 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:17,536 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 16:01:17,536 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:17,542 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 16:01:17,543 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:17,543 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 26 [2018-10-22 16:01:17,543 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:17,544 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 16:01:17,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 16:01:17,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:01:17,544 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand 14 states. [2018-10-22 16:01:18,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:18,215 INFO L93 Difference]: Finished difference Result 86 states and 88 transitions. [2018-10-22 16:01:18,216 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 16:01:18,216 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-22 16:01:18,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:18,217 INFO L225 Difference]: With dead ends: 86 [2018-10-22 16:01:18,217 INFO L226 Difference]: Without dead ends: 81 [2018-10-22 16:01:18,218 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 162 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:01:18,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-22 16:01:18,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2018-10-22 16:01:18,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-10-22 16:01:18,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2018-10-22 16:01:18,222 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 44 [2018-10-22 16:01:18,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:18,222 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2018-10-22 16:01:18,222 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 16:01:18,222 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2018-10-22 16:01:18,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-22 16:01:18,223 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:18,223 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:18,223 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:18,223 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:18,223 INFO L82 PathProgramCache]: Analyzing trace with hash -2087071331, now seen corresponding path program 11 times [2018-10-22 16:01:18,223 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:18,224 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:18,224 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:18,224 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:18,224 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:18,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:18,524 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 16:01:18,524 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:18,524 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:18,524 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:18,525 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:18,525 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:18,525 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 16:01:18,533 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:01:18,533 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:20,038 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 16:01:20,038 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:20,041 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:20,075 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 16:01:20,075 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:22,996 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 16:01:23,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:23,016 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 16:01:23,032 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:01:23,032 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:23,191 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 16:01:23,192 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:23,195 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:23,206 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 16:01:23,206 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:23,212 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 16:01:23,213 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:23,213 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 26 [2018-10-22 16:01:23,213 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:23,213 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 16:01:23,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 16:01:23,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:01:23,214 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 14 states. [2018-10-22 16:01:23,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:23,444 INFO L93 Difference]: Finished difference Result 89 states and 91 transitions. [2018-10-22 16:01:23,444 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 16:01:23,444 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-22 16:01:23,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:23,445 INFO L225 Difference]: With dead ends: 89 [2018-10-22 16:01:23,445 INFO L226 Difference]: Without dead ends: 84 [2018-10-22 16:01:23,446 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 162 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:01:23,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-22 16:01:23,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2018-10-22 16:01:23,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-10-22 16:01:23,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2018-10-22 16:01:23,450 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 44 [2018-10-22 16:01:23,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:23,450 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2018-10-22 16:01:23,450 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 16:01:23,451 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2018-10-22 16:01:23,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-22 16:01:23,451 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:23,451 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:23,452 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:23,452 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:23,452 INFO L82 PathProgramCache]: Analyzing trace with hash -1361137378, now seen corresponding path program 12 times [2018-10-22 16:01:23,452 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:23,453 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:23,453 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:23,453 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:23,453 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:23,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:24,157 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 16:01:24,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:24,158 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:24,158 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:24,158 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:24,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:24,158 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 16:01:24,166 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:01:24,167 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:01:25,055 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 16:01:25,055 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:25,062 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:25,090 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 16:01:25,090 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:28,559 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 16:01:28,579 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:28,579 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 16:01:28,596 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:01:28,596 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:01:28,985 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 16:01:28,985 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:28,989 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:29,001 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 16:01:29,001 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:29,020 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 16:01:29,022 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:29,022 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-10-22 16:01:29,022 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:29,022 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 16:01:29,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 16:01:29,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:01:29,023 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand 15 states. [2018-10-22 16:01:29,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:29,376 INFO L93 Difference]: Finished difference Result 92 states and 94 transitions. [2018-10-22 16:01:29,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:01:29,376 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-10-22 16:01:29,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:29,377 INFO L225 Difference]: With dead ends: 92 [2018-10-22 16:01:29,378 INFO L226 Difference]: Without dead ends: 87 [2018-10-22 16:01:29,379 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 173 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:01:29,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-22 16:01:29,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2018-10-22 16:01:29,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-10-22 16:01:29,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2018-10-22 16:01:29,384 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 47 [2018-10-22 16:01:29,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:29,384 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2018-10-22 16:01:29,384 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 16:01:29,384 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2018-10-22 16:01:29,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-22 16:01:29,385 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:29,385 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:29,385 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:29,385 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:29,386 INFO L82 PathProgramCache]: Analyzing trace with hash -1385736802, now seen corresponding path program 12 times [2018-10-22 16:01:29,386 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:29,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:29,386 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:29,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:29,387 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:29,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:29,722 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 16:01:29,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:29,722 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:29,723 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:29,723 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:29,723 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:29,723 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 16:01:29,730 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:01:29,730 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:01:36,378 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 16:01:36,378 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:36,381 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:36,405 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 16:01:36,406 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:39,170 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 16:01:39,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:39,192 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 16:01:39,207 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:01:39,207 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:01:39,424 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 16:01:39,424 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:39,427 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:39,443 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 16:01:39,444 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:39,456 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 16:01:39,458 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:39,458 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-10-22 16:01:39,458 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:39,458 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 16:01:39,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 16:01:39,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:01:39,459 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 15 states. [2018-10-22 16:01:39,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:39,718 INFO L93 Difference]: Finished difference Result 95 states and 97 transitions. [2018-10-22 16:01:39,719 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:01:39,719 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-10-22 16:01:39,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:39,720 INFO L225 Difference]: With dead ends: 95 [2018-10-22 16:01:39,720 INFO L226 Difference]: Without dead ends: 90 [2018-10-22 16:01:39,721 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 173 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:01:39,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-22 16:01:39,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2018-10-22 16:01:39,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-22 16:01:39,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2018-10-22 16:01:39,726 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 47 [2018-10-22 16:01:39,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:39,727 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2018-10-22 16:01:39,727 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 16:01:39,727 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2018-10-22 16:01:39,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-22 16:01:39,727 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:39,728 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:39,728 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:39,728 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:39,728 INFO L82 PathProgramCache]: Analyzing trace with hash -2022685701, now seen corresponding path program 13 times [2018-10-22 16:01:39,728 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:39,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:39,729 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:39,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:39,729 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:39,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:39,947 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 16:01:39,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:39,948 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:39,948 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:39,948 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:39,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:39,948 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 16:01:39,957 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:39,957 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:01:39,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:39,974 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:39,982 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 16:01:39,982 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:44,799 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 16:01:44,819 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:44,820 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 16:01:44,835 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:44,835 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:01:44,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:44,877 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:44,885 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 16:01:44,885 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:44,894 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 16:01:44,895 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:44,895 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-10-22 16:01:44,895 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:44,895 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:01:44,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:01:44,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:01:44,896 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand 16 states. [2018-10-22 16:01:45,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:45,558 INFO L93 Difference]: Finished difference Result 98 states and 100 transitions. [2018-10-22 16:01:45,558 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:01:45,558 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-10-22 16:01:45,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:45,560 INFO L225 Difference]: With dead ends: 98 [2018-10-22 16:01:45,560 INFO L226 Difference]: Without dead ends: 93 [2018-10-22 16:01:45,561 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 184 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:01:45,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-22 16:01:45,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2018-10-22 16:01:45,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-10-22 16:01:45,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2018-10-22 16:01:45,566 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 50 [2018-10-22 16:01:45,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:45,566 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2018-10-22 16:01:45,566 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:01:45,566 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2018-10-22 16:01:45,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-22 16:01:45,567 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:45,567 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:45,567 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:45,567 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:45,567 INFO L82 PathProgramCache]: Analyzing trace with hash 1350288893, now seen corresponding path program 13 times [2018-10-22 16:01:45,567 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:45,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:45,568 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:45,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:45,568 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:45,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:46,452 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 16:01:46,452 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:46,453 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:46,453 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:46,453 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:46,453 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:46,453 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 16:01:46,460 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:46,460 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:01:46,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:46,474 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:46,482 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 16:01:46,482 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:52,160 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 16:01:52,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:52,181 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 16:01:52,196 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:52,196 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:01:52,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:52,233 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:52,253 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 16:01:52,253 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:52,305 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 16:01:52,306 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:52,307 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-10-22 16:01:52,307 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:52,307 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:01:52,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:01:52,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:01:52,308 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand 16 states. [2018-10-22 16:01:52,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:52,647 INFO L93 Difference]: Finished difference Result 101 states and 103 transitions. [2018-10-22 16:01:52,647 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:01:52,647 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-10-22 16:01:52,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:52,649 INFO L225 Difference]: With dead ends: 101 [2018-10-22 16:01:52,649 INFO L226 Difference]: Without dead ends: 96 [2018-10-22 16:01:52,650 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 184 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:01:52,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-22 16:01:52,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2018-10-22 16:01:52,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-10-22 16:01:52,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2018-10-22 16:01:52,654 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 50 [2018-10-22 16:01:52,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:52,654 INFO L481 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2018-10-22 16:01:52,654 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:01:52,654 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2018-10-22 16:01:52,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-22 16:01:52,655 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:52,655 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:52,655 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:52,655 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:52,655 INFO L82 PathProgramCache]: Analyzing trace with hash -603854850, now seen corresponding path program 14 times [2018-10-22 16:01:52,655 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:52,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:52,656 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:52,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:52,656 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:52,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:53,309 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 16:01:53,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:53,310 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:53,310 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:53,310 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:53,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:53,310 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 16:01:53,318 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:01:53,318 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:53,336 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:01:53,336 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:53,338 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:53,348 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 16:01:53,349 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:59,556 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 16:01:59,576 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:59,577 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 16:01:59,591 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:01:59,591 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:59,638 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:01:59,639 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:59,642 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:59,651 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 16:01:59,651 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:59,664 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 16:01:59,665 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:59,665 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 32 [2018-10-22 16:01:59,665 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:59,666 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 16:01:59,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 16:01:59,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-22 16:01:59,666 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand 17 states. [2018-10-22 16:02:00,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:00,095 INFO L93 Difference]: Finished difference Result 104 states and 106 transitions. [2018-10-22 16:02:00,095 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 16:02:00,095 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-10-22 16:02:00,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:00,096 INFO L225 Difference]: With dead ends: 104 [2018-10-22 16:02:00,096 INFO L226 Difference]: Without dead ends: 99 [2018-10-22 16:02:00,098 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 195 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-22 16:02:00,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-22 16:02:00,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2018-10-22 16:02:00,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-10-22 16:02:00,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 100 transitions. [2018-10-22 16:02:00,102 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 100 transitions. Word has length 53 [2018-10-22 16:02:00,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:00,103 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 100 transitions. [2018-10-22 16:02:00,103 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 16:02:00,103 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 100 transitions. [2018-10-22 16:02:00,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-22 16:02:00,103 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:00,104 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:00,104 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:00,104 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:00,104 INFO L82 PathProgramCache]: Analyzing trace with hash 402425150, now seen corresponding path program 14 times [2018-10-22 16:02:00,104 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:00,105 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:00,105 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:00,105 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:00,105 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:00,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:00,327 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 16:02:00,327 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:00,327 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:00,327 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:00,327 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:00,327 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:00,327 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 16:02:00,336 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:02:00,336 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:00,354 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:02:00,354 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:00,355 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:00,375 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 16:02:00,375 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:05,725 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 16:02:05,746 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:05,746 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 16:02:05,761 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:02:05,761 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:05,802 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:02:05,802 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:05,805 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:05,817 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 16:02:05,818 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:05,847 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 16:02:05,848 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:05,848 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 32 [2018-10-22 16:02:05,849 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:05,849 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 16:02:05,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 16:02:05,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-22 16:02:05,849 INFO L87 Difference]: Start difference. First operand 98 states and 100 transitions. Second operand 17 states. [2018-10-22 16:02:06,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:06,173 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2018-10-22 16:02:06,173 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 16:02:06,173 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-10-22 16:02:06,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:06,174 INFO L225 Difference]: With dead ends: 107 [2018-10-22 16:02:06,174 INFO L226 Difference]: Without dead ends: 102 [2018-10-22 16:02:06,175 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 195 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-22 16:02:06,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-10-22 16:02:06,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2018-10-22 16:02:06,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-10-22 16:02:06,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2018-10-22 16:02:06,181 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 53 [2018-10-22 16:02:06,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:06,181 INFO L481 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2018-10-22 16:02:06,181 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 16:02:06,181 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2018-10-22 16:02:06,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-22 16:02:06,182 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:06,182 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:06,183 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:06,183 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:06,183 INFO L82 PathProgramCache]: Analyzing trace with hash 1012867355, now seen corresponding path program 15 times [2018-10-22 16:02:06,183 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:06,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:06,184 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:06,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:06,184 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:06,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:06,439 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 16:02:06,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:06,440 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:06,440 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:06,440 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:06,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:06,440 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 16:02:06,447 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:06,448 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:26,204 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:02:26,204 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:26,249 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:26,370 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 16:02:26,370 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:28,747 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:02:34,185 WARN L179 SmtUtils]: Spent 1.65 s on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:02:34,884 WARN L179 SmtUtils]: Spent 279.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:02:34,893 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 16:02:34,913 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:34,913 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 16:02:34,928 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:34,928 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:35,529 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:02:35,529 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:35,533 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:35,552 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 16:02:35,553 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:53,375 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 342 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:53,376 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:53,376 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 19, 18, 18] total 46 [2018-10-22 16:02:53,376 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:53,376 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:02:53,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:02:53,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=615, Invalid=1454, Unknown=1, NotChecked=0, Total=2070 [2018-10-22 16:02:53,377 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand 18 states. [2018-10-22 16:02:53,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:53,819 INFO L93 Difference]: Finished difference Result 110 states and 112 transitions. [2018-10-22 16:02:53,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 16:02:53,820 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-10-22 16:02:53,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:53,821 INFO L225 Difference]: With dead ends: 110 [2018-10-22 16:02:53,821 INFO L226 Difference]: Without dead ends: 105 [2018-10-22 16:02:53,823 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 193 SyntacticMatches, 4 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 26.6s TimeCoverageRelationStatistics Valid=615, Invalid=1454, Unknown=1, NotChecked=0, Total=2070 [2018-10-22 16:02:53,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-22 16:02:53,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2018-10-22 16:02:53,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2018-10-22 16:02:53,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 106 transitions. [2018-10-22 16:02:53,828 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 106 transitions. Word has length 56 [2018-10-22 16:02:53,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:53,828 INFO L481 AbstractCegarLoop]: Abstraction has 104 states and 106 transitions. [2018-10-22 16:02:53,828 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:02:53,828 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 106 transitions. [2018-10-22 16:02:53,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-22 16:02:53,829 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:53,829 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:53,829 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:53,830 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:53,830 INFO L82 PathProgramCache]: Analyzing trace with hash 2003628637, now seen corresponding path program 15 times [2018-10-22 16:02:53,830 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:53,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:53,830 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:53,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:53,831 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:53,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:54,247 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 16:02:54,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:54,247 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:54,247 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:54,247 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:54,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:54,247 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 16:02:54,255 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:54,256 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:57,954 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:02:57,954 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:57,959 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:57,968 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 16:02:57,968 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:07,783 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 16:03:07,804 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:07,805 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 16:03:07,822 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:03:07,822 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:03:08,128 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:03:08,128 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:08,132 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:08,155 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 16:03:08,155 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:08,184 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 16:03:08,185 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:08,185 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 34 [2018-10-22 16:03:08,185 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:08,186 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:03:08,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:03:08,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-22 16:03:08,187 INFO L87 Difference]: Start difference. First operand 104 states and 106 transitions. Second operand 18 states. [2018-10-22 16:03:08,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:08,586 INFO L93 Difference]: Finished difference Result 113 states and 115 transitions. [2018-10-22 16:03:08,586 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 16:03:08,586 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-10-22 16:03:08,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:08,587 INFO L225 Difference]: With dead ends: 113 [2018-10-22 16:03:08,587 INFO L226 Difference]: Without dead ends: 108 [2018-10-22 16:03:08,588 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 206 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-22 16:03:08,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2018-10-22 16:03:08,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2018-10-22 16:03:08,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-10-22 16:03:08,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2018-10-22 16:03:08,593 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 56 [2018-10-22 16:03:08,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:08,594 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2018-10-22 16:03:08,594 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:03:08,594 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2018-10-22 16:03:08,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-22 16:03:08,594 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:08,594 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:08,594 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:08,595 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:08,595 INFO L82 PathProgramCache]: Analyzing trace with hash 1020819166, now seen corresponding path program 16 times [2018-10-22 16:03:08,595 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:08,595 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:08,595 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:08,595 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:08,595 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:08,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:09,818 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 16:03:09,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:09,819 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:09,819 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:09,819 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:09,819 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:09,819 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 16:03:09,828 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:03:09,828 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:03:09,847 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:03:09,847 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:09,848 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:09,858 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 16:03:09,858 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:17,834 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 16:03:17,853 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:17,853 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 16:03:17,868 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:03:17,868 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:03:17,915 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:03:17,916 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:17,919 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:17,937 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 16:03:17,937 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:17,963 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 16:03:17,965 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:17,965 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 36 [2018-10-22 16:03:17,965 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:17,965 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 16:03:17,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 16:03:17,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:03:17,966 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand 19 states. [2018-10-22 16:03:18,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:18,497 INFO L93 Difference]: Finished difference Result 116 states and 118 transitions. [2018-10-22 16:03:18,497 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:03:18,497 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-10-22 16:03:18,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:18,498 INFO L225 Difference]: With dead ends: 116 [2018-10-22 16:03:18,499 INFO L226 Difference]: Without dead ends: 111 [2018-10-22 16:03:18,499 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 217 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:03:18,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-10-22 16:03:18,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 110. [2018-10-22 16:03:18,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-10-22 16:03:18,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 112 transitions. [2018-10-22 16:03:18,504 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 112 transitions. Word has length 59 [2018-10-22 16:03:18,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:18,505 INFO L481 AbstractCegarLoop]: Abstraction has 110 states and 112 transitions. [2018-10-22 16:03:18,505 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 16:03:18,505 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 112 transitions. [2018-10-22 16:03:18,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-22 16:03:18,505 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:18,506 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:18,506 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:18,506 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:18,506 INFO L82 PathProgramCache]: Analyzing trace with hash -745046818, now seen corresponding path program 16 times [2018-10-22 16:03:18,506 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:18,506 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:18,507 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:18,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:18,507 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:18,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:18,987 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 16:03:18,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:18,987 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:18,988 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:18,988 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:18,988 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:18,988 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) [2018-10-22 16:03:18,999 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:03:18,999 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:03:19,022 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:03:19,022 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:19,024 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:19,042 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 16:03:19,042 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:26,804 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 16:03:26,823 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:26,823 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 16:03:26,838 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:03:26,838 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:03:26,879 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:03:26,879 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:26,882 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:26,891 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 16:03:26,892 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:26,905 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 16:03:26,906 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:26,907 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 36 [2018-10-22 16:03:26,907 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:26,907 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 16:03:26,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 16:03:26,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:03:26,908 INFO L87 Difference]: Start difference. First operand 110 states and 112 transitions. Second operand 19 states. [2018-10-22 16:03:27,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:27,340 INFO L93 Difference]: Finished difference Result 119 states and 121 transitions. [2018-10-22 16:03:27,340 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:03:27,340 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-10-22 16:03:27,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:27,341 INFO L225 Difference]: With dead ends: 119 [2018-10-22 16:03:27,342 INFO L226 Difference]: Without dead ends: 114 [2018-10-22 16:03:27,342 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 217 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:03:27,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-22 16:03:27,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2018-10-22 16:03:27,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2018-10-22 16:03:27,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2018-10-22 16:03:27,347 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 59 [2018-10-22 16:03:27,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:27,348 INFO L481 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2018-10-22 16:03:27,348 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 16:03:27,348 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2018-10-22 16:03:27,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-22 16:03:27,349 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:27,349 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:27,349 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:27,349 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:27,349 INFO L82 PathProgramCache]: Analyzing trace with hash 1690019387, now seen corresponding path program 17 times [2018-10-22 16:03:27,349 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:27,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:27,350 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:27,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:27,350 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:27,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:27,683 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 16:03:27,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:27,683 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:27,683 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:27,683 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:27,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:27,684 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 16:03:27,690 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:03:27,690 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:03:58,262 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 16:03:58,263 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:58,638 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:58,657 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 16:03:58,658 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:08,596 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 439 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:08,617 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:08,617 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 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 16:04:08,632 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:04:08,632 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:04:09,079 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 16:04:09,079 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:09,085 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:09,126 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 16:04:09,127 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:09,174 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 439 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:09,178 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:04:09,178 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 38 [2018-10-22 16:04:09,178 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:04:09,179 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 16:04:09,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 16:04:09,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1007, Unknown=2, NotChecked=0, Total=1406 [2018-10-22 16:04:09,180 INFO L87 Difference]: Start difference. First operand 113 states and 115 transitions. Second operand 20 states. [2018-10-22 16:04:09,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:09,868 INFO L93 Difference]: Finished difference Result 122 states and 124 transitions. [2018-10-22 16:04:09,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-22 16:04:09,869 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-10-22 16:04:09,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:09,870 INFO L225 Difference]: With dead ends: 122 [2018-10-22 16:04:09,870 INFO L226 Difference]: Without dead ends: 117 [2018-10-22 16:04:09,871 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 228 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=397, Invalid=1007, Unknown=2, NotChecked=0, Total=1406 [2018-10-22 16:04:09,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-22 16:04:09,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2018-10-22 16:04:09,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2018-10-22 16:04:09,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 118 transitions. [2018-10-22 16:04:09,878 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 118 transitions. Word has length 62 [2018-10-22 16:04:09,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:09,878 INFO L481 AbstractCegarLoop]: Abstraction has 116 states and 118 transitions. [2018-10-22 16:04:09,878 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 16:04:09,878 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 118 transitions. [2018-10-22 16:04:09,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-22 16:04:09,879 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:09,879 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:09,879 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:09,879 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:09,880 INFO L82 PathProgramCache]: Analyzing trace with hash 1310938813, now seen corresponding path program 17 times [2018-10-22 16:04:09,880 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:09,880 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:09,880 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:04:09,880 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:09,881 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:09,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:10,502 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 16:04:10,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:10,502 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:10,502 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:10,502 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:10,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:10,502 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 16:04:10,511 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:04:10,511 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:04:47,098 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 16:04:47,098 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:47,111 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:47,130 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 16:04:47,130 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:54,269 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 16:04:54,273 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:54,273 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 16:04:54,287 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:04:54,288 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) Received shutdown request... [2018-10-22 16:04:54,741 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 16:04:54,741 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:54,745 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:54,779 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-22 16:04:54,979 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:04:54,980 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-22 16:04:54,985 WARN L205 ceAbstractionStarter]: Timeout [2018-10-22 16:04:54,985 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 04:04:54 BoogieIcfgContainer [2018-10-22 16:04:54,985 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-22 16:04:54,986 INFO L168 Benchmark]: Toolchain (without parser) took 271273.51 ms. Allocated memory was 1.5 GB in the beginning and 2.5 GB in the end (delta: 958.9 MB). Free memory was 1.4 GB in the beginning and 1.6 GB in the end (delta: -193.6 MB). Peak memory consumption was 765.3 MB. Max. memory is 7.1 GB. [2018-10-22 16:04:54,987 INFO L168 Benchmark]: CDTParser took 0.20 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 16:04:54,987 INFO L168 Benchmark]: CACSL2BoogieTranslator took 317.50 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 16:04:54,988 INFO L168 Benchmark]: Boogie Procedure Inliner took 25.05 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 16:04:54,988 INFO L168 Benchmark]: Boogie Preprocessor took 29.55 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 16:04:54,989 INFO L168 Benchmark]: RCFGBuilder took 365.60 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 742.4 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -805.5 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. [2018-10-22 16:04:54,989 INFO L168 Benchmark]: TraceAbstraction took 270529.42 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 216.5 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 601.4 MB). Peak memory consumption was 817.9 MB. Max. memory is 7.1 GB. [2018-10-22 16:04:54,992 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 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 317.50 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 25.05 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 29.55 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 365.60 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 742.4 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -805.5 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 270529.42 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 216.5 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 601.4 MB). Peak memory consumption was 817.9 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 63 with TraceHistMax 18,while TraceCheckSpWp was constructing forward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 38 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. TIMEOUT Result, 270.4s OverallTime, 38 OverallIterations, 18 TraceHistogramMax, 9.9s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 715 SDtfs, 36 SDslu, 6193 SDs, 0 SdLazy, 9747 SolverSat, 72 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 8.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5359 GetRequests, 4570 SyntacticMatches, 109 SemanticMatches, 680 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 138.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=116occurred in iteration=37, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 1.3s AbstIntTime, 3 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 37 MinimizatonAttempts, 40 StatesRemovedByMinimization, 36 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 68.7s SatisfiabilityAnalysisTime, 142.7s InterpolantComputationTime, 3779 NumberOfCodeBlocks, 3779 NumberOfCodeBlocksAsserted, 408 NumberOfCheckSat, 6100 ConstructedInterpolants, 0 QuantifiedInterpolants, 1489720 SizeOfPredicates, 70 NumberOfNonLiveVariables, 4918 ConjunctsInSsa, 1362 ConjunctsInUnsatCore, 173 InterpolantComputations, 6 PerfectInterpolantSequences, 28/25372 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown