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/functions_true-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:13:22,356 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:13:22,358 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:13:22,377 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:13:22,377 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:13:22,378 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:13:22,380 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:13:22,383 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:13:22,385 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:13:22,393 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:13:22,394 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:13:22,394 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:13:22,397 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:13:22,398 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:13:22,401 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:13:22,403 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:13:22,403 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:13:22,408 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:13:22,414 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:13:22,417 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:13:22,418 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:13:22,420 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:13:22,423 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-24 12:13:22,441 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 [2018-10-24 12:13:22,464 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:13:22,464 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:13:22,465 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:13:22,465 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:13:22,466 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:13:22,466 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:13:22,466 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:13:22,466 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:13:22,467 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:13:22,467 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:13:22,467 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:13:22,467 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:13:22,468 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:13:22,468 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:13:22,469 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:13:22,469 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:13:22,469 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:13:22,469 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:13:22,469 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:13:22,470 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:13:22,470 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:13:22,470 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:13:22,470 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:13:22,470 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:13:22,471 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:13:22,471 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:13:22,471 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:13:22,471 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:13:22,471 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:13:22,472 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:13:22,472 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:13:22,472 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:13:22,472 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:13:22,472 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:13:22,518 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:13:22,532 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:13:22,537 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:13:22,539 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:13:22,539 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:13:22,541 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/functions_true-unreach-call1_true-termination.i [2018-10-24 12:13:22,609 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/c82b27cae/b47f311215874ef1b88ff9d4d8ce343d/FLAG2ccfd5791 [2018-10-24 12:13:23,112 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:13:23,113 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/functions_true-unreach-call1_true-termination.i [2018-10-24 12:13:23,120 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/c82b27cae/b47f311215874ef1b88ff9d4d8ce343d/FLAG2ccfd5791 [2018-10-24 12:13:23,135 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/c82b27cae/b47f311215874ef1b88ff9d4d8ce343d [2018-10-24 12:13:23,146 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:13:23,147 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:13:23,148 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:13:23,149 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:13:23,153 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:13:23,154 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:13:23" (1/1) ... [2018-10-24 12:13:23,157 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6b38e11 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:13:23, skipping insertion in model container [2018-10-24 12:13:23,157 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:13:23" (1/1) ... [2018-10-24 12:13:23,168 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:13:23,189 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:13:23,351 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:13:23,355 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:13:23,369 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:13:23,384 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:13:23,384 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:13:23 WrapperNode [2018-10-24 12:13:23,385 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:13:23,385 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:13:23,386 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:13:23,386 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:13:23,393 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:13:23" (1/1) ... [2018-10-24 12:13:23,398 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:13:23" (1/1) ... [2018-10-24 12:13:23,405 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:13:23,405 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:13:23,405 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:13:23,405 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:13:23,414 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:13:23" (1/1) ... [2018-10-24 12:13:23,414 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:13:23" (1/1) ... [2018-10-24 12:13:23,415 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:13:23" (1/1) ... [2018-10-24 12:13:23,415 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:13:23" (1/1) ... [2018-10-24 12:13:23,419 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:13:23" (1/1) ... [2018-10-24 12:13:23,424 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:13:23" (1/1) ... [2018-10-24 12:13:23,425 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:13:23" (1/1) ... [2018-10-24 12:13:23,427 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:13:23,427 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:13:23,427 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:13:23,428 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:13:23,429 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:13:23" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:13:23,491 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:13:23,492 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:13:23,492 INFO L130 BoogieDeclarations]: Found specification of procedure f [2018-10-24 12:13:23,492 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2018-10-24 12:13:23,492 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:13:23,492 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:13:23,492 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:13:23,492 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:13:23,493 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:13:23,493 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:13:23,768 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:13:23,769 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:13:23 BoogieIcfgContainer [2018-10-24 12:13:23,769 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:13:23,770 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:13:23,770 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:13:23,773 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:13:23,774 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:13:23" (1/3) ... [2018-10-24 12:13:23,774 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@edc1512 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:13:23, skipping insertion in model container [2018-10-24 12:13:23,775 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:13:23" (2/3) ... [2018-10-24 12:13:23,775 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@edc1512 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:13:23, skipping insertion in model container [2018-10-24 12:13:23,775 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:13:23" (3/3) ... [2018-10-24 12:13:23,777 INFO L112 eAbstractionObserver]: Analyzing ICFG functions_true-unreach-call1_true-termination.i [2018-10-24 12:13:23,788 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:13:23,796 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:13:23,811 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:13:23,846 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:13:23,847 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:13:23,847 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:13:23,847 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:13:23,847 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:13:23,847 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:13:23,848 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:13:23,848 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:13:23,866 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2018-10-24 12:13:23,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-24 12:13:23,873 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:23,874 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:23,876 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:23,881 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:23,882 INFO L82 PathProgramCache]: Analyzing trace with hash 1196028990, now seen corresponding path program 1 times [2018-10-24 12:13:23,884 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:23,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:23,937 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:23,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:23,937 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:23,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:23,999 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:24,001 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:13:24,002 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:13:24,002 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:13:24,006 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:13:24,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:13:24,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:13:24,020 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 2 states. [2018-10-24 12:13:24,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:24,041 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-24 12:13:24,041 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:13:24,043 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-24 12:13:24,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:24,050 INFO L225 Difference]: With dead ends: 34 [2018-10-24 12:13:24,050 INFO L226 Difference]: Without dead ends: 17 [2018-10-24 12:13:24,054 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:13:24,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-10-24 12:13:24,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-10-24 12:13:24,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-24 12:13:24,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-24 12:13:24,091 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 10 [2018-10-24 12:13:24,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:24,092 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-24 12:13:24,092 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:13:24,092 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-24 12:13:24,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-24 12:13:24,093 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:24,093 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:24,093 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:24,094 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:24,094 INFO L82 PathProgramCache]: Analyzing trace with hash -1888530020, now seen corresponding path program 1 times [2018-10-24 12:13:24,094 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:24,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:24,096 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:24,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:24,096 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:24,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:24,216 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:24,217 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:13:24,217 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:13:24,217 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:13:24,219 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:13:24,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:13:24,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:13:24,220 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 3 states. [2018-10-24 12:13:24,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:24,276 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2018-10-24 12:13:24,277 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:13:24,277 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-24 12:13:24,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:24,279 INFO L225 Difference]: With dead ends: 26 [2018-10-24 12:13:24,279 INFO L226 Difference]: Without dead ends: 21 [2018-10-24 12:13:24,280 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:13:24,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-24 12:13:24,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2018-10-24 12:13:24,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-24 12:13:24,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-10-24 12:13:24,291 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 11 [2018-10-24 12:13:24,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:24,292 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-10-24 12:13:24,292 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:13:24,292 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-10-24 12:13:24,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-24 12:13:24,293 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:24,293 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:24,293 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:24,294 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:24,294 INFO L82 PathProgramCache]: Analyzing trace with hash 1261609818, now seen corresponding path program 1 times [2018-10-24 12:13:24,294 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:24,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:24,295 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:24,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:24,296 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:24,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:24,806 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:24,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:24,807 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:24,808 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-24 12:13:24,810 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [6], [10], [14], [16], [18], [24], [27], [29], [35], [36], [37], [39], [40], [41] [2018-10-24 12:13:24,858 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:13:24,859 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:13:24,964 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:13:25,314 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:13:25,316 INFO L272 AbstractInterpreter]: Visited 17 different actions 121 times. Merged at 5 different actions 44 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-24 12:13:25,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:25,362 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:13:25,362 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:25,363 INFO L194 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 [2018-10-24 12:13:25,379 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:25,380 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:13:25,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:25,419 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:25,519 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:25,520 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:25,887 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:13:26,098 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:26,120 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:26,121 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-24 12:13:26,121 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:26,121 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:13:26,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:13:26,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:13:26,123 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 6 states. [2018-10-24 12:13:26,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:26,218 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-10-24 12:13:26,219 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:13:26,219 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2018-10-24 12:13:26,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:26,221 INFO L225 Difference]: With dead ends: 30 [2018-10-24 12:13:26,221 INFO L226 Difference]: Without dead ends: 25 [2018-10-24 12:13:26,222 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 30 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:13:26,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-24 12:13:26,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2018-10-24 12:13:26,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-24 12:13:26,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-10-24 12:13:26,231 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2018-10-24 12:13:26,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:26,231 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-10-24 12:13:26,231 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:13:26,232 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-10-24 12:13:26,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 12:13:26,233 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:26,233 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:26,234 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:26,234 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:26,234 INFO L82 PathProgramCache]: Analyzing trace with hash -1235124260, now seen corresponding path program 2 times [2018-10-24 12:13:26,234 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:26,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:26,236 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:26,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:26,236 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:26,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:26,568 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-24 12:13:26,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:26,569 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:26,569 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:26,569 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:26,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:26,570 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:13:26,581 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:13:26,581 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:13:26,599 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:13:26,599 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:13:26,602 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:26,717 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-24 12:13:26,717 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:27,480 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-24 12:13:27,511 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:27,512 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 15 [2018-10-24 12:13:27,512 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:27,512 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:13:27,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:13:27,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:13:27,513 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 8 states. [2018-10-24 12:13:27,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:27,686 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-24 12:13:27,687 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:13:27,688 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2018-10-24 12:13:27,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:27,690 INFO L225 Difference]: With dead ends: 34 [2018-10-24 12:13:27,690 INFO L226 Difference]: Without dead ends: 29 [2018-10-24 12:13:27,691 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 40 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:13:27,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-24 12:13:27,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2018-10-24 12:13:27,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-24 12:13:27,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2018-10-24 12:13:27,698 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 25 [2018-10-24 12:13:27,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:27,699 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2018-10-24 12:13:27,699 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:13:27,699 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2018-10-24 12:13:27,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-24 12:13:27,700 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:27,701 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:27,701 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:27,701 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:27,701 INFO L82 PathProgramCache]: Analyzing trace with hash 1046211866, now seen corresponding path program 3 times [2018-10-24 12:13:27,702 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:27,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:27,703 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:13:27,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:27,703 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:27,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:27,946 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-24 12:13:27,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:27,946 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:27,947 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:27,947 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:27,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:27,947 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:13:27,955 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:13:27,956 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:13:27,970 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:13:27,970 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:13:27,974 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:28,051 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-24 12:13:28,051 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:28,583 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-24 12:13:28,613 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:28,613 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 12] total 20 [2018-10-24 12:13:28,613 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:28,614 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:13:28,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:13:28,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:13:28,616 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 10 states. [2018-10-24 12:13:28,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:28,885 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2018-10-24 12:13:28,891 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:13:28,891 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-24 12:13:28,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:28,892 INFO L225 Difference]: With dead ends: 38 [2018-10-24 12:13:28,892 INFO L226 Difference]: Without dead ends: 33 [2018-10-24 12:13:28,893 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 50 SyntacticMatches, 8 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=98, Invalid=408, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:13:28,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-24 12:13:28,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2018-10-24 12:13:28,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-24 12:13:28,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2018-10-24 12:13:28,900 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 32 [2018-10-24 12:13:28,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:28,900 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2018-10-24 12:13:28,900 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:13:28,900 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2018-10-24 12:13:28,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-24 12:13:28,902 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:28,902 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:28,902 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:28,902 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:28,903 INFO L82 PathProgramCache]: Analyzing trace with hash -1312440804, now seen corresponding path program 4 times [2018-10-24 12:13:28,903 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:28,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:28,904 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:13:28,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:28,904 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:28,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:29,180 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-24 12:13:29,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:29,180 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:29,180 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:29,181 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:29,181 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:29,181 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:13:29,189 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:29,189 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:13:29,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:29,209 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:29,273 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-24 12:13:29,273 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:30,600 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-24 12:13:30,620 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:30,620 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 15] total 25 [2018-10-24 12:13:30,620 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:30,621 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:13:30,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:13:30,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=508, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:13:30,623 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand 12 states. [2018-10-24 12:13:30,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:30,934 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2018-10-24 12:13:30,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:13:30,935 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2018-10-24 12:13:30,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:30,936 INFO L225 Difference]: With dead ends: 42 [2018-10-24 12:13:30,936 INFO L226 Difference]: Without dead ends: 37 [2018-10-24 12:13:30,937 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 60 SyntacticMatches, 10 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=144, Invalid=668, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:13:30,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-24 12:13:30,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2018-10-24 12:13:30,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-24 12:13:30,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2018-10-24 12:13:30,945 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 39 [2018-10-24 12:13:30,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:30,945 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2018-10-24 12:13:30,945 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:13:30,946 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2018-10-24 12:13:30,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-24 12:13:30,947 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:30,947 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:30,948 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:30,948 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:30,948 INFO L82 PathProgramCache]: Analyzing trace with hash -341760294, now seen corresponding path program 5 times [2018-10-24 12:13:30,948 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:30,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:30,949 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:30,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:30,950 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:30,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:31,232 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-24 12:13:31,232 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:31,233 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:31,233 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:31,233 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:31,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:31,233 INFO L194 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 [2018-10-24 12:13:31,244 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:13:31,245 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:13:31,294 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:13:31,294 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:13:31,299 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:31,382 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-24 12:13:31,383 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:32,585 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-10-24 12:13:32,606 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:32,606 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 18] total 30 [2018-10-24 12:13:32,606 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:32,607 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:13:32,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:13:32,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=747, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:13:32,609 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 14 states. [2018-10-24 12:13:33,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:33,076 INFO L93 Difference]: Finished difference Result 46 states and 52 transitions. [2018-10-24 12:13:33,076 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:13:33,076 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 46 [2018-10-24 12:13:33,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:33,078 INFO L225 Difference]: With dead ends: 46 [2018-10-24 12:13:33,078 INFO L226 Difference]: Without dead ends: 41 [2018-10-24 12:13:33,079 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 70 SyntacticMatches, 12 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=198, Invalid=992, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:13:33,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-24 12:13:33,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2018-10-24 12:13:33,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-24 12:13:33,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2018-10-24 12:13:33,086 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 46 [2018-10-24 12:13:33,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:33,087 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2018-10-24 12:13:33,087 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:13:33,087 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2018-10-24 12:13:33,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-24 12:13:33,089 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:33,089 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:33,089 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:33,089 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:33,090 INFO L82 PathProgramCache]: Analyzing trace with hash -2000679844, now seen corresponding path program 6 times [2018-10-24 12:13:33,090 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:33,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:33,091 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:13:33,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:33,091 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:33,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:33,386 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 12:13:33,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:33,387 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:33,387 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:33,387 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:33,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:33,388 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:13:33,397 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:13:33,398 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:13:33,418 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:13:33,419 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:13:33,425 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:33,543 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 12:13:33,543 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:34,891 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:13:35,001 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:13:38,364 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:13:38,385 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:38,385 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 21] total 35 [2018-10-24 12:13:38,385 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:38,386 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:13:38,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:13:38,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1032, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:13:38,388 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand 16 states. [2018-10-24 12:13:38,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:38,869 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2018-10-24 12:13:38,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:13:38,870 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 53 [2018-10-24 12:13:38,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:38,871 INFO L225 Difference]: With dead ends: 50 [2018-10-24 12:13:38,872 INFO L226 Difference]: Without dead ends: 45 [2018-10-24 12:13:38,873 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 80 SyntacticMatches, 14 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=260, Invalid=1380, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:13:38,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-24 12:13:38,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2018-10-24 12:13:38,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-24 12:13:38,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2018-10-24 12:13:38,880 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 53 [2018-10-24 12:13:38,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:38,880 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2018-10-24 12:13:38,880 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:13:38,880 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2018-10-24 12:13:38,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-10-24 12:13:38,881 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:38,882 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:38,882 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:38,882 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:38,882 INFO L82 PathProgramCache]: Analyzing trace with hash -1151446886, now seen corresponding path program 7 times [2018-10-24 12:13:38,882 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:38,883 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:38,883 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:13:38,883 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:38,883 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:38,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:39,232 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-10-24 12:13:39,232 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:39,232 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:39,232 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:39,233 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:39,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:39,233 INFO L194 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 [2018-10-24 12:13:39,241 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:39,242 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:13:39,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:39,266 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:39,368 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-10-24 12:13:39,368 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:40,803 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-10-24 12:13:40,826 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:40,827 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 24] total 40 [2018-10-24 12:13:40,827 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:40,827 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:13:40,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:13:40,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1363, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:13:40,828 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand 18 states. [2018-10-24 12:13:41,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:41,376 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2018-10-24 12:13:41,377 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:13:41,377 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 60 [2018-10-24 12:13:41,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:41,379 INFO L225 Difference]: With dead ends: 54 [2018-10-24 12:13:41,379 INFO L226 Difference]: Without dead ends: 49 [2018-10-24 12:13:41,380 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 90 SyntacticMatches, 16 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=330, Invalid=1832, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:13:41,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-24 12:13:41,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2018-10-24 12:13:41,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-24 12:13:41,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 54 transitions. [2018-10-24 12:13:41,387 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 54 transitions. Word has length 60 [2018-10-24 12:13:41,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:41,388 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 54 transitions. [2018-10-24 12:13:41,388 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:13:41,388 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 54 transitions. [2018-10-24 12:13:41,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-24 12:13:41,389 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:41,389 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:41,390 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:41,390 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:41,390 INFO L82 PathProgramCache]: Analyzing trace with hash -210474340, now seen corresponding path program 8 times [2018-10-24 12:13:41,390 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:41,391 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:41,391 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:41,391 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:41,391 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:41,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:41,714 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:13:41,715 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:41,715 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:41,715 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:41,715 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:41,715 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:41,715 INFO L194 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 [2018-10-24 12:13:41,726 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:13:41,726 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:14:03,303 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:14:03,304 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:03,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:03,584 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:14:03,584 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:05,267 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 184 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-24 12:14:05,289 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:05,289 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 27] total 45 [2018-10-24 12:14:05,289 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:05,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:14:05,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:14:05,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=1740, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:14:05,292 INFO L87 Difference]: Start difference. First operand 47 states and 54 transitions. Second operand 20 states. [2018-10-24 12:14:06,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:06,022 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2018-10-24 12:14:06,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:14:06,023 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2018-10-24 12:14:06,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:06,025 INFO L225 Difference]: With dead ends: 58 [2018-10-24 12:14:06,025 INFO L226 Difference]: Without dead ends: 53 [2018-10-24 12:14:06,026 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 100 SyntacticMatches, 18 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=408, Invalid=2348, Unknown=0, NotChecked=0, Total=2756 [2018-10-24 12:14:06,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-10-24 12:14:06,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2018-10-24 12:14:06,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-24 12:14:06,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 59 transitions. [2018-10-24 12:14:06,034 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 59 transitions. Word has length 67 [2018-10-24 12:14:06,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:06,034 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 59 transitions. [2018-10-24 12:14:06,034 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:14:06,034 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 59 transitions. [2018-10-24 12:14:06,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-24 12:14:06,036 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:06,036 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:06,036 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:06,036 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:06,037 INFO L82 PathProgramCache]: Analyzing trace with hash 1156541018, now seen corresponding path program 9 times [2018-10-24 12:14:06,037 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:06,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:06,038 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:14:06,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:06,038 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:06,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:06,634 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-24 12:14:06,634 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:06,634 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:06,634 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:06,634 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:06,634 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:06,634 INFO L194 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 [2018-10-24 12:14:06,642 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:14:06,642 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:14:06,662 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:14:06,662 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:06,668 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:06,736 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-24 12:14:06,736 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:11,066 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-10-24 12:14:11,088 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:11,088 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 30] total 50 [2018-10-24 12:14:11,088 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:11,089 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:14:11,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:14:11,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=2163, Unknown=1, NotChecked=0, Total=2450 [2018-10-24 12:14:11,090 INFO L87 Difference]: Start difference. First operand 51 states and 59 transitions. Second operand 22 states. [2018-10-24 12:14:11,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:11,998 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2018-10-24 12:14:11,998 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:14:11,999 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 74 [2018-10-24 12:14:11,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:12,000 INFO L225 Difference]: With dead ends: 62 [2018-10-24 12:14:12,001 INFO L226 Difference]: Without dead ends: 57 [2018-10-24 12:14:12,002 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 110 SyntacticMatches, 20 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 287 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=493, Invalid=2928, Unknown=1, NotChecked=0, Total=3422 [2018-10-24 12:14:12,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-24 12:14:12,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2018-10-24 12:14:12,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-10-24 12:14:12,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2018-10-24 12:14:12,011 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 74 [2018-10-24 12:14:12,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:12,012 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2018-10-24 12:14:12,012 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:14:12,012 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2018-10-24 12:14:12,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-10-24 12:14:12,013 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:12,014 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:12,014 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:12,014 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:12,014 INFO L82 PathProgramCache]: Analyzing trace with hash -1694050084, now seen corresponding path program 10 times [2018-10-24 12:14:12,014 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:12,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:12,015 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:14:12,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:12,015 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:12,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:13,307 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-10-24 12:14:13,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:13,307 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:13,307 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:13,308 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:13,308 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:13,308 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:14:13,318 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:13,318 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:14:13,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:13,344 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:13,589 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-10-24 12:14:13,589 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:16,856 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 290 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 12:14:16,878 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:16,878 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 33] total 55 [2018-10-24 12:14:16,878 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:16,879 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:14:16,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:14:16,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=338, Invalid=2632, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:14:16,881 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand 24 states. [2018-10-24 12:14:17,925 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-24 12:14:18,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:18,172 INFO L93 Difference]: Finished difference Result 66 states and 77 transitions. [2018-10-24 12:14:18,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 12:14:18,173 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 81 [2018-10-24 12:14:18,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:18,174 INFO L225 Difference]: With dead ends: 66 [2018-10-24 12:14:18,174 INFO L226 Difference]: Without dead ends: 61 [2018-10-24 12:14:18,176 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 120 SyntacticMatches, 22 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=588, Invalid=3572, Unknown=0, NotChecked=0, Total=4160 [2018-10-24 12:14:18,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-24 12:14:18,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2018-10-24 12:14:18,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-24 12:14:18,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 69 transitions. [2018-10-24 12:14:18,183 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 69 transitions. Word has length 81 [2018-10-24 12:14:18,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:18,184 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 69 transitions. [2018-10-24 12:14:18,184 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:14:18,184 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 69 transitions. [2018-10-24 12:14:18,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-10-24 12:14:18,185 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:18,186 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:18,186 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:18,186 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:18,186 INFO L82 PathProgramCache]: Analyzing trace with hash 246445082, now seen corresponding path program 11 times [2018-10-24 12:14:18,186 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:18,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:18,187 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:18,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:18,188 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:18,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:18,724 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-24 12:14:18,725 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:18,725 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:18,725 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:18,725 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:18,725 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:18,725 INFO L194 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 [2018-10-24 12:14:18,733 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:14:18,734 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:14:51,601 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:14:51,602 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:52,015 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:52,364 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-24 12:14:52,364 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:54,814 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:14:54,938 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:14:59,773 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 352 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-10-24 12:14:59,796 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:59,796 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 37] total 61 [2018-10-24 12:14:59,796 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:59,796 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:14:59,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:14:59,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=3252, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:14:59,798 INFO L87 Difference]: Start difference. First operand 59 states and 69 transitions. Second operand 26 states. [2018-10-24 12:15:01,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:01,641 INFO L93 Difference]: Finished difference Result 70 states and 82 transitions. [2018-10-24 12:15:01,642 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:15:01,642 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 88 [2018-10-24 12:15:01,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:01,644 INFO L225 Difference]: With dead ends: 70 [2018-10-24 12:15:01,644 INFO L226 Difference]: Without dead ends: 65 [2018-10-24 12:15:01,646 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 124 SyntacticMatches, 29 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 487 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=716, Invalid=4396, Unknown=0, NotChecked=0, Total=5112 [2018-10-24 12:15:01,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-10-24 12:15:01,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2018-10-24 12:15:01,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-24 12:15:01,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2018-10-24 12:15:01,653 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 88 [2018-10-24 12:15:01,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:01,653 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2018-10-24 12:15:01,653 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:15:01,654 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2018-10-24 12:15:01,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-24 12:15:01,655 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:01,655 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:01,656 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:01,656 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:01,656 INFO L82 PathProgramCache]: Analyzing trace with hash 1503352604, now seen corresponding path program 12 times [2018-10-24 12:15:01,656 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:01,657 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:01,657 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:01,657 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:01,657 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:01,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:02,209 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-24 12:15:02,210 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:02,210 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:02,210 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:02,210 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:02,210 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:02,210 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:02,219 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:15:02,219 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:15:02,248 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:15:02,248 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:02,253 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:02,387 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-24 12:15:02,387 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:05,784 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-24 12:15:05,805 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:05,805 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 39] total 65 [2018-10-24 12:15:05,806 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:05,806 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:15:05,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:15:05,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=452, Invalid=3708, Unknown=0, NotChecked=0, Total=4160 [2018-10-24 12:15:05,808 INFO L87 Difference]: Start difference. First operand 63 states and 74 transitions. Second operand 28 states. [2018-10-24 12:15:07,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:07,032 INFO L93 Difference]: Finished difference Result 74 states and 87 transitions. [2018-10-24 12:15:07,032 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:15:07,033 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 95 [2018-10-24 12:15:07,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:07,035 INFO L225 Difference]: With dead ends: 74 [2018-10-24 12:15:07,035 INFO L226 Difference]: Without dead ends: 69 [2018-10-24 12:15:07,038 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 140 SyntacticMatches, 26 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=800, Invalid=5052, Unknown=0, NotChecked=0, Total=5852 [2018-10-24 12:15:07,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-24 12:15:07,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2018-10-24 12:15:07,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-10-24 12:15:07,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 79 transitions. [2018-10-24 12:15:07,048 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 79 transitions. Word has length 95 [2018-10-24 12:15:07,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:07,048 INFO L481 AbstractCegarLoop]: Abstraction has 67 states and 79 transitions. [2018-10-24 12:15:07,048 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:15:07,048 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 79 transitions. [2018-10-24 12:15:07,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-10-24 12:15:07,050 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:07,050 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:07,050 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:07,050 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:07,050 INFO L82 PathProgramCache]: Analyzing trace with hash 1308454362, now seen corresponding path program 13 times [2018-10-24 12:15:07,051 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:07,051 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:07,051 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:07,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:07,052 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:07,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:08,086 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-10-24 12:15:08,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:08,086 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:08,087 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:08,087 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:08,087 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:08,087 INFO L194 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 [2018-10-24 12:15:08,095 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:08,095 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:15:08,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:08,131 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:08,262 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-10-24 12:15:08,262 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:14,715 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 494 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-10-24 12:15:14,736 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:14,737 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 42] total 70 [2018-10-24 12:15:14,737 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:14,737 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:15:14,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:15:14,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=514, Invalid=4315, Unknown=1, NotChecked=0, Total=4830 [2018-10-24 12:15:14,739 INFO L87 Difference]: Start difference. First operand 67 states and 79 transitions. Second operand 30 states. [2018-10-24 12:15:16,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:16,104 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-10-24 12:15:16,104 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-24 12:15:16,104 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 102 [2018-10-24 12:15:16,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:16,106 INFO L225 Difference]: With dead ends: 78 [2018-10-24 12:15:16,106 INFO L226 Difference]: Without dead ends: 73 [2018-10-24 12:15:16,109 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 150 SyntacticMatches, 28 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 601 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=917, Invalid=5888, Unknown=1, NotChecked=0, Total=6806 [2018-10-24 12:15:16,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-24 12:15:16,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2018-10-24 12:15:16,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-10-24 12:15:16,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 84 transitions. [2018-10-24 12:15:16,116 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 84 transitions. Word has length 102 [2018-10-24 12:15:16,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:16,117 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 84 transitions. [2018-10-24 12:15:16,117 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:15:16,117 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 84 transitions. [2018-10-24 12:15:16,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:15:16,118 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:16,119 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:16,119 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:16,119 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:16,119 INFO L82 PathProgramCache]: Analyzing trace with hash 2052449628, now seen corresponding path program 14 times [2018-10-24 12:15:16,119 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:16,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:16,120 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:16,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:16,120 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:16,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:17,035 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-24 12:15:17,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:17,036 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:17,036 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:17,036 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:17,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:17,036 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:17,045 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:15:17,045 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:26,296 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-24 12:16:26,296 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:26,821 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:26,919 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-24 12:16:26,919 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:33,167 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 574 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-24 12:16:33,188 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:33,189 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 45] total 75 [2018-10-24 12:16:33,189 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:33,189 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:16:33,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:16:33,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=581, Invalid=4968, Unknown=1, NotChecked=0, Total=5550 [2018-10-24 12:16:33,192 INFO L87 Difference]: Start difference. First operand 71 states and 84 transitions. Second operand 32 states. [2018-10-24 12:16:34,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:34,836 INFO L93 Difference]: Finished difference Result 82 states and 97 transitions. [2018-10-24 12:16:34,836 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:16:34,837 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 109 [2018-10-24 12:16:34,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:34,838 INFO L225 Difference]: With dead ends: 82 [2018-10-24 12:16:34,838 INFO L226 Difference]: Without dead ends: 77 [2018-10-24 12:16:34,841 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 160 SyntacticMatches, 30 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 695 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=1043, Invalid=6788, Unknown=1, NotChecked=0, Total=7832 [2018-10-24 12:16:34,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-10-24 12:16:34,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2018-10-24 12:16:34,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-24 12:16:34,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 89 transitions. [2018-10-24 12:16:34,848 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 89 transitions. Word has length 109 [2018-10-24 12:16:34,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:34,849 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 89 transitions. [2018-10-24 12:16:34,849 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:16:34,849 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 89 transitions. [2018-10-24 12:16:34,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-24 12:16:34,850 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:34,850 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:34,850 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:34,851 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:34,851 INFO L82 PathProgramCache]: Analyzing trace with hash -1489872998, now seen corresponding path program 15 times [2018-10-24 12:16:34,851 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:34,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:34,852 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:34,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:34,852 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:34,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:36,017 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-24 12:16:36,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:36,017 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:36,018 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:36,018 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:36,018 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:36,018 INFO L194 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 [2018-10-24 12:16:36,025 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:36,025 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:36,062 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:36,062 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:36,066 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:36,242 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-24 12:16:36,242 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:45,212 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 660 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-10-24 12:16:45,233 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:45,233 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 48] total 80 [2018-10-24 12:16:45,233 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:45,234 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:16:45,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:16:45,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=652, Invalid=5667, Unknown=1, NotChecked=0, Total=6320 [2018-10-24 12:16:45,235 INFO L87 Difference]: Start difference. First operand 75 states and 89 transitions. Second operand 34 states. [2018-10-24 12:16:46,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:46,966 INFO L93 Difference]: Finished difference Result 86 states and 102 transitions. [2018-10-24 12:16:46,966 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:16:46,966 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 116 [2018-10-24 12:16:46,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:46,968 INFO L225 Difference]: With dead ends: 86 [2018-10-24 12:16:46,968 INFO L226 Difference]: Without dead ends: 81 [2018-10-24 12:16:46,969 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 170 SyntacticMatches, 32 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 796 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=1177, Invalid=7752, Unknown=1, NotChecked=0, Total=8930 [2018-10-24 12:16:46,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-24 12:16:46,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2018-10-24 12:16:46,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-24 12:16:46,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 94 transitions. [2018-10-24 12:16:46,976 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 94 transitions. Word has length 116 [2018-10-24 12:16:46,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:46,977 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 94 transitions. [2018-10-24 12:16:46,977 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:16:46,977 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 94 transitions. [2018-10-24 12:16:46,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-10-24 12:16:46,978 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:46,978 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:46,978 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:46,979 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:46,979 INFO L82 PathProgramCache]: Analyzing trace with hash -111508580, now seen corresponding path program 16 times [2018-10-24 12:16:46,979 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:46,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:46,980 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:46,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:46,980 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:46,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:48,190 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-10-24 12:16:48,190 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:48,190 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:48,190 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:48,190 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:48,190 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:48,190 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:48,199 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:48,200 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:48,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:48,242 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:48,435 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-10-24 12:16:48,435 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:01,279 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 752 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-24 12:17:01,301 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:01,301 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 51] total 85 [2018-10-24 12:17:01,301 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:01,302 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:17:01,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:17:01,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=725, Invalid=6412, Unknown=3, NotChecked=0, Total=7140 [2018-10-24 12:17:01,303 INFO L87 Difference]: Start difference. First operand 79 states and 94 transitions. Second operand 36 states. [2018-10-24 12:17:03,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:03,516 INFO L93 Difference]: Finished difference Result 90 states and 107 transitions. [2018-10-24 12:17:03,517 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-24 12:17:03,517 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 123 [2018-10-24 12:17:03,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:03,518 INFO L225 Difference]: With dead ends: 90 [2018-10-24 12:17:03,518 INFO L226 Difference]: Without dead ends: 85 [2018-10-24 12:17:03,520 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 180 SyntacticMatches, 34 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 880 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=1317, Invalid=8780, Unknown=3, NotChecked=0, Total=10100 [2018-10-24 12:17:03,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-24 12:17:03,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2018-10-24 12:17:03,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-10-24 12:17:03,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2018-10-24 12:17:03,526 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 123 [2018-10-24 12:17:03,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:03,526 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2018-10-24 12:17:03,526 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:17:03,526 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2018-10-24 12:17:03,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2018-10-24 12:17:03,527 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:03,527 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:03,527 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:03,528 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:03,528 INFO L82 PathProgramCache]: Analyzing trace with hash -307547814, now seen corresponding path program 17 times [2018-10-24 12:17:03,528 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:03,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:03,529 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:03,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:03,529 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:03,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:04,942 INFO L134 CoverageAnalysis]: Checked inductivity of 986 backedges. 0 proven. 578 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2018-10-24 12:17:04,942 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:04,942 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:04,942 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:04,942 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:04,942 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:04,942 INFO L194 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 [2018-10-24 12:17:04,951 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:04,952 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown