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_false-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:00:25,359 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:00:25,362 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:00:25,378 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:00:25,378 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:00:25,379 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:00:25,381 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:00:25,383 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:00:25,385 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:00:25,385 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:00:25,386 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:00:25,387 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:00:25,388 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:00:25,389 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:00:25,390 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:00:25,391 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:00:25,392 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:00:25,394 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:00:25,395 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:00:25,397 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:00:25,398 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:00:25,399 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:00:25,401 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-22 16:00:25,411 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-22 16:00:25,440 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:00:25,440 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:00:25,443 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:00:25,443 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:00:25,443 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:00:25,444 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:00:25,446 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:00:25,446 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:00:25,446 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:00:25,446 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:00:25,447 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:00:25,447 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:00:25,448 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:00:25,448 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:00:25,448 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:00:25,448 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:00:25,449 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:00:25,449 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:00:25,449 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:00:25,449 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:00:25,449 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:00:25,449 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:00:25,451 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:00:25,452 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:00:25,452 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:00:25,452 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:00:25,452 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:00:25,452 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:00:25,452 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:00:25,453 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:00:25,453 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:00:25,453 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:00:25,453 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:00:25,454 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:00:25,512 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:00:25,525 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:00:25,530 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:00:25,532 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:00:25,532 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:00:25,533 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/functions_false-unreach-call1_true-termination.i [2018-10-22 16:00:25,602 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/d960e25a8/88a61c7bf96e4009b8e15a8b2ce6a578/FLAG1a428afc3 [2018-10-22 16:00:26,031 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:00:26,032 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/functions_false-unreach-call1_true-termination.i [2018-10-22 16:00:26,039 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/d960e25a8/88a61c7bf96e4009b8e15a8b2ce6a578/FLAG1a428afc3 [2018-10-22 16:00:26,055 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/d960e25a8/88a61c7bf96e4009b8e15a8b2ce6a578 [2018-10-22 16:00:26,069 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:00:26,071 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:00:26,074 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:00:26,074 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:00:26,078 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:00:26,079 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:00:26" (1/1) ... [2018-10-22 16:00:26,083 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ad6d500 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:26, skipping insertion in model container [2018-10-22 16:00:26,083 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:00:26" (1/1) ... [2018-10-22 16:00:26,095 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:00:26,123 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:00:26,363 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:00:26,367 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:00:26,384 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:00:26,400 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:00:26,401 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:26 WrapperNode [2018-10-22 16:00:26,401 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:00:26,402 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:00:26,402 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:00:26,402 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:00:26,412 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:26" (1/1) ... [2018-10-22 16:00:26,418 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:26" (1/1) ... [2018-10-22 16:00:26,424 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:00:26,425 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:00:26,425 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:00:26,425 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:00:26,435 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:26" (1/1) ... [2018-10-22 16:00:26,436 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:26" (1/1) ... [2018-10-22 16:00:26,436 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:26" (1/1) ... [2018-10-22 16:00:26,437 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:26" (1/1) ... [2018-10-22 16:00:26,440 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:26" (1/1) ... [2018-10-22 16:00:26,445 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:26" (1/1) ... [2018-10-22 16:00:26,446 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:26" (1/1) ... [2018-10-22 16:00:26,448 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:00:26,448 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:00:26,449 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:00:26,449 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:00:26,450 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:26" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:00:26,511 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:00:26,512 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:00:26,512 INFO L130 BoogieDeclarations]: Found specification of procedure f [2018-10-22 16:00:26,512 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2018-10-22 16:00:26,512 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:00:26,512 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:00:26,513 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:00:26,513 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:00:26,513 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:00:26,513 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:00:26,790 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:00:26,791 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:00:26 BoogieIcfgContainer [2018-10-22 16:00:26,791 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:00:26,792 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:00:26,793 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:00:26,796 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:00:26,797 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:00:26" (1/3) ... [2018-10-22 16:00:26,798 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a6499a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:00:26, skipping insertion in model container [2018-10-22 16:00:26,798 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:26" (2/3) ... [2018-10-22 16:00:26,798 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a6499a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:00:26, skipping insertion in model container [2018-10-22 16:00:26,799 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:00:26" (3/3) ... [2018-10-22 16:00:26,801 INFO L112 eAbstractionObserver]: Analyzing ICFG functions_false-unreach-call1_true-termination.i [2018-10-22 16:00:26,812 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:00:26,820 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:00:26,839 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:00:26,875 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:00:26,876 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:00:26,877 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:00:26,877 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:00:26,877 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:00:26,877 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:00:26,877 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:00:26,878 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:00:26,878 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:00:26,904 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2018-10-22 16:00:26,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-22 16:00:26,915 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:26,916 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:26,918 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:26,923 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:26,924 INFO L82 PathProgramCache]: Analyzing trace with hash 1196028990, now seen corresponding path program 1 times [2018-10-22 16:00:26,926 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:26,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:26,973 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:26,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:26,973 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:26,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:27,023 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:27,025 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:00:27,026 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:00:27,026 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:00:27,030 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:00:27,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:00:27,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:00:27,044 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 2 states. [2018-10-22 16:00:27,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:27,065 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-22 16:00:27,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:00:27,067 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-22 16:00:27,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:27,074 INFO L225 Difference]: With dead ends: 34 [2018-10-22 16:00:27,075 INFO L226 Difference]: Without dead ends: 17 [2018-10-22 16:00:27,080 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:00:27,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-10-22 16:00:27,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-10-22 16:00:27,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-22 16:00:27,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-22 16:00:27,117 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 10 [2018-10-22 16:00:27,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:27,117 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-22 16:00:27,117 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:00:27,118 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-22 16:00:27,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 16:00:27,118 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:27,119 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:27,119 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:27,119 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:27,120 INFO L82 PathProgramCache]: Analyzing trace with hash -1888530020, now seen corresponding path program 1 times [2018-10-22 16:00:27,120 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:27,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:27,121 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:27,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:27,122 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:27,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:27,238 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:27,238 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:00:27,238 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:00:27,238 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:00:27,240 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:00:27,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:00:27,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:00:27,241 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 3 states. [2018-10-22 16:00:27,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:27,294 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2018-10-22 16:00:27,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:00:27,295 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-22 16:00:27,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:27,298 INFO L225 Difference]: With dead ends: 26 [2018-10-22 16:00:27,298 INFO L226 Difference]: Without dead ends: 21 [2018-10-22 16:00:27,300 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:00:27,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-22 16:00:27,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2018-10-22 16:00:27,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-22 16:00:27,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-10-22 16:00:27,320 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 11 [2018-10-22 16:00:27,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:27,321 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-10-22 16:00:27,321 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:00:27,321 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-10-22 16:00:27,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-22 16:00:27,322 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:27,322 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:27,323 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:27,323 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:27,330 INFO L82 PathProgramCache]: Analyzing trace with hash 1261609818, now seen corresponding path program 1 times [2018-10-22 16:00:27,330 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:27,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:27,332 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:27,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:27,332 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:27,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:27,576 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:27,577 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:27,577 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:27,578 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-22 16:00:27,580 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [6], [10], [14], [16], [18], [24], [27], [29], [35], [36], [37], [39], [40], [41] [2018-10-22 16:00:27,629 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:00:27,629 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:00:27,749 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:00:28,227 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:00:28,229 INFO L272 AbstractInterpreter]: Visited 17 different actions 133 times. Merged at 5 different actions 49 times. Widened at 1 different actions 6 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-22 16:00:28,273 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:28,275 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:00:28,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:28,276 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:28,291 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:28,292 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:28,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:28,333 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:28,439 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:28,439 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:28,790 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:00:28,976 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:28,999 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:28,999 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:29,015 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:29,015 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:29,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:29,039 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:29,119 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:29,119 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:29,207 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:29,215 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:29,215 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-10-22 16:00:29,216 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:29,216 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 16:00:29,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 16:00:29,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:00:29,218 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 6 states. [2018-10-22 16:00:29,373 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-22 16:00:29,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:29,414 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-10-22 16:00:29,415 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 16:00:29,415 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2018-10-22 16:00:29,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:29,417 INFO L225 Difference]: With dead ends: 30 [2018-10-22 16:00:29,417 INFO L226 Difference]: Without dead ends: 25 [2018-10-22 16:00:29,418 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 62 SyntacticMatches, 7 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2018-10-22 16:00:29,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-22 16:00:29,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2018-10-22 16:00:29,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-22 16:00:29,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-10-22 16:00:29,425 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2018-10-22 16:00:29,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:29,426 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-10-22 16:00:29,426 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 16:00:29,426 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-10-22 16:00:29,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-22 16:00:29,428 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:29,428 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:29,428 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:29,429 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:29,429 INFO L82 PathProgramCache]: Analyzing trace with hash -1235124260, now seen corresponding path program 2 times [2018-10-22 16:00:29,429 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:29,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:29,430 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:29,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:29,430 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:29,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:29,694 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-22 16:00:29,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:29,695 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:29,695 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:29,695 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:29,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:29,696 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:29,711 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:29,712 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:29,728 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:29,728 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:29,731 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:29,844 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-22 16:00:29,844 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:30,526 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:00:30,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:30,547 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:30,564 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:30,564 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:30,594 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:30,594 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:30,599 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:30,668 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-22 16:00:30,669 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:30,782 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:00:30,784 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:30,784 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9, 8, 9] total 15 [2018-10-22 16:00:30,784 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:30,785 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 16:00:30,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 16:00:30,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:00:30,786 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 8 states. [2018-10-22 16:00:30,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:30,995 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-22 16:00:30,996 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:00:30,996 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2018-10-22 16:00:30,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:30,998 INFO L225 Difference]: With dead ends: 34 [2018-10-22 16:00:30,998 INFO L226 Difference]: Without dead ends: 29 [2018-10-22 16:00:30,999 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 84 SyntacticMatches, 11 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2018-10-22 16:00:30,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-22 16:00:31,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2018-10-22 16:00:31,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-22 16:00:31,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2018-10-22 16:00:31,005 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 25 [2018-10-22 16:00:31,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:31,006 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2018-10-22 16:00:31,006 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 16:00:31,006 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2018-10-22 16:00:31,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-22 16:00:31,007 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:31,008 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:31,008 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:31,008 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:31,008 INFO L82 PathProgramCache]: Analyzing trace with hash 1046211866, now seen corresponding path program 3 times [2018-10-22 16:00:31,008 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:31,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:31,010 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:31,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:31,010 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:31,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:31,312 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-22 16:00:31,313 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:31,313 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:31,313 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:31,314 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:31,314 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:31,314 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:31,330 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:31,330 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:31,517 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:00:31,517 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:31,523 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:31,553 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-22 16:00:31,553 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:32,071 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-22 16:00:32,091 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:32,091 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:32,112 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:32,112 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:32,166 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:00:32,166 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:32,171 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:32,273 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-22 16:00:32,273 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:32,446 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-22 16:00:32,448 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:32,448 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 12, 10, 12] total 20 [2018-10-22 16:00:32,448 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:32,449 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:00:32,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:00:32,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:00:32,451 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 10 states. [2018-10-22 16:00:32,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:32,647 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2018-10-22 16:00:32,648 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:00:32,648 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-22 16:00:32,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:32,650 INFO L225 Difference]: With dead ends: 38 [2018-10-22 16:00:32,650 INFO L226 Difference]: Without dead ends: 33 [2018-10-22 16:00:32,652 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 106 SyntacticMatches, 15 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=98, Invalid=408, Unknown=0, NotChecked=0, Total=506 [2018-10-22 16:00:32,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-22 16:00:32,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2018-10-22 16:00:32,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-22 16:00:32,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2018-10-22 16:00:32,659 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 32 [2018-10-22 16:00:32,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:32,659 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2018-10-22 16:00:32,659 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:00:32,659 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2018-10-22 16:00:32,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-22 16:00:32,661 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:32,661 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:32,661 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:32,661 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:32,661 INFO L82 PathProgramCache]: Analyzing trace with hash -1312440804, now seen corresponding path program 4 times [2018-10-22 16:00:32,662 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:32,662 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:32,663 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:32,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:32,663 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:32,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:32,905 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-22 16:00:32,906 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:32,906 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:32,906 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:32,906 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:32,906 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:32,906 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:32,914 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:32,915 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:32,961 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:32,961 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:32,965 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:33,074 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-22 16:00:33,074 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:33,984 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-22 16:00:34,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:34,005 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:34,021 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:34,021 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:34,056 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:34,057 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:34,061 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:34,226 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-22 16:00:34,227 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:34,487 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-22 16:00:34,490 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:34,490 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 15, 12, 15] total 25 [2018-10-22 16:00:34,490 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:34,490 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 16:00:34,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 16:00:34,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=508, Unknown=0, NotChecked=0, Total=600 [2018-10-22 16:00:34,491 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand 12 states. [2018-10-22 16:00:34,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:34,747 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2018-10-22 16:00:34,748 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 16:00:34,748 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2018-10-22 16:00:34,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:34,749 INFO L225 Difference]: With dead ends: 42 [2018-10-22 16:00:34,749 INFO L226 Difference]: Without dead ends: 37 [2018-10-22 16:00:34,750 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 128 SyntacticMatches, 19 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=144, Invalid=668, Unknown=0, NotChecked=0, Total=812 [2018-10-22 16:00:34,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-22 16:00:34,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2018-10-22 16:00:34,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-22 16:00:34,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2018-10-22 16:00:34,757 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 39 [2018-10-22 16:00:34,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:34,757 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2018-10-22 16:00:34,757 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 16:00:34,757 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2018-10-22 16:00:34,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-22 16:00:34,759 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:34,759 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:34,759 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:34,760 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:34,760 INFO L82 PathProgramCache]: Analyzing trace with hash -341760294, now seen corresponding path program 5 times [2018-10-22 16:00:34,760 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:34,761 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:34,761 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:34,761 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:34,761 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:34,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:35,072 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-22 16:00:35,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:35,073 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:35,073 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:35,073 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:35,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:35,074 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:35,081 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:35,082 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:35,133 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:00:35,133 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:35,137 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:35,251 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-22 16:00:35,252 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:36,359 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-10-22 16:00:36,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:36,386 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:36,402 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:36,403 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:36,486 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:00:36,486 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:36,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:36,591 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-22 16:00:36,591 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:36,827 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-10-22 16:00:36,833 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:36,833 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 18, 14, 18] total 30 [2018-10-22 16:00:36,834 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:36,834 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 16:00:36,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 16:00:36,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=747, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:00:36,835 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 14 states. [2018-10-22 16:00:37,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:37,765 INFO L93 Difference]: Finished difference Result 46 states and 52 transitions. [2018-10-22 16:00:37,766 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 16:00:37,766 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 46 [2018-10-22 16:00:37,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:37,767 INFO L225 Difference]: With dead ends: 46 [2018-10-22 16:00:37,767 INFO L226 Difference]: Without dead ends: 41 [2018-10-22 16:00:37,768 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 150 SyntacticMatches, 23 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=198, Invalid=992, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:00:37,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-22 16:00:37,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2018-10-22 16:00:37,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-22 16:00:37,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2018-10-22 16:00:37,774 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 46 [2018-10-22 16:00:37,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:37,775 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2018-10-22 16:00:37,775 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 16:00:37,775 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2018-10-22 16:00:37,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-22 16:00:37,776 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:37,777 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:37,777 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:37,777 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:37,777 INFO L82 PathProgramCache]: Analyzing trace with hash -2000679844, now seen corresponding path program 6 times [2018-10-22 16:00:37,777 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:37,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:37,778 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:37,779 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:37,779 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:37,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:38,124 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-22 16:00:38,124 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:38,124 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:38,125 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:38,125 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:38,125 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:38,125 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:38,135 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:00:38,135 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:00:38,372 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:00:38,372 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:38,376 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:38,422 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-22 16:00:38,423 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:40,020 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:00:40,043 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:40,044 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:40,059 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:00:40,059 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:00:40,160 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:00:40,160 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:40,165 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:40,227 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-22 16:00:40,227 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:40,436 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:00:40,438 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:40,439 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 21, 16, 21] total 35 [2018-10-22 16:00:40,439 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:40,439 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:00:40,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:00:40,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1032, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:00:40,441 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand 16 states. [2018-10-22 16:00:40,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:40,886 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2018-10-22 16:00:40,887 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:00:40,887 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 53 [2018-10-22 16:00:40,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:40,889 INFO L225 Difference]: With dead ends: 50 [2018-10-22 16:00:40,889 INFO L226 Difference]: Without dead ends: 45 [2018-10-22 16:00:40,890 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 172 SyntacticMatches, 27 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=260, Invalid=1380, Unknown=0, NotChecked=0, Total=1640 [2018-10-22 16:00:40,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-22 16:00:40,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2018-10-22 16:00:40,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-22 16:00:40,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2018-10-22 16:00:40,897 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 53 [2018-10-22 16:00:40,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:40,897 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2018-10-22 16:00:40,897 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:00:40,898 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2018-10-22 16:00:40,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-10-22 16:00:40,899 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:40,899 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:40,899 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:40,899 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:40,900 INFO L82 PathProgramCache]: Analyzing trace with hash -1151446886, now seen corresponding path program 7 times [2018-10-22 16:00:40,900 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:40,900 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:40,901 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:40,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:40,901 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:40,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:41,453 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-10-22 16:00:41,453 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:41,453 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:41,453 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:41,454 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:41,454 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:41,454 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:41,467 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:41,467 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:41,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:41,488 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:41,698 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-10-22 16:00:41,698 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:45,224 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-10-22 16:00:45,245 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:45,246 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:45,261 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:45,261 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:45,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:45,313 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:45,533 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-10-22 16:00:45,533 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:45,881 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-10-22 16:00:45,882 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:45,883 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 24, 18, 24] total 40 [2018-10-22 16:00:45,883 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:45,883 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:00:45,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:00:45,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1363, Unknown=1, NotChecked=0, Total=1560 [2018-10-22 16:00:45,885 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand 18 states. [2018-10-22 16:00:46,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:46,634 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2018-10-22 16:00:46,634 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 16:00:46,635 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 60 [2018-10-22 16:00:46,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:46,636 INFO L225 Difference]: With dead ends: 54 [2018-10-22 16:00:46,636 INFO L226 Difference]: Without dead ends: 49 [2018-10-22 16:00:46,638 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 194 SyntacticMatches, 31 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=329, Invalid=1832, Unknown=1, NotChecked=0, Total=2162 [2018-10-22 16:00:46,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-22 16:00:46,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2018-10-22 16:00:46,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-22 16:00:46,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 54 transitions. [2018-10-22 16:00:46,645 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 54 transitions. Word has length 60 [2018-10-22 16:00:46,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:46,645 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 54 transitions. [2018-10-22 16:00:46,646 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:00:46,646 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 54 transitions. [2018-10-22 16:00:46,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-22 16:00:46,647 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:46,648 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:46,648 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:46,648 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:46,648 INFO L82 PathProgramCache]: Analyzing trace with hash -210474340, now seen corresponding path program 8 times [2018-10-22 16:00:46,648 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:46,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:46,649 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:46,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:46,650 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:46,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:47,325 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:00:47,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:47,325 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:47,325 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:47,325 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:47,326 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:47,326 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:47,334 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:47,334 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:47,355 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:47,356 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:47,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:47,550 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:00:47,550 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:51,883 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 184 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-22 16:00:51,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:51,904 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:51,920 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:51,920 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:51,974 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:51,974 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:51,979 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:52,053 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:00:52,053 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:52,372 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 184 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-22 16:00:52,375 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:52,375 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 27, 20, 27] total 45 [2018-10-22 16:00:52,375 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:52,376 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 16:00:52,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 16:00:52,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=1740, Unknown=1, NotChecked=0, Total=1980 [2018-10-22 16:00:52,377 INFO L87 Difference]: Start difference. First operand 47 states and 54 transitions. Second operand 20 states. [2018-10-22 16:00:52,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:52,974 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2018-10-22 16:00:52,975 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-22 16:00:52,975 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2018-10-22 16:00:52,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:52,977 INFO L225 Difference]: With dead ends: 58 [2018-10-22 16:00:52,977 INFO L226 Difference]: Without dead ends: 53 [2018-10-22 16:00:52,978 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 216 SyntacticMatches, 35 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 371 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=407, Invalid=2348, Unknown=1, NotChecked=0, Total=2756 [2018-10-22 16:00:52,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-10-22 16:00:52,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2018-10-22 16:00:52,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-22 16:00:52,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 59 transitions. [2018-10-22 16:00:52,985 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 59 transitions. Word has length 67 [2018-10-22 16:00:52,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:52,985 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 59 transitions. [2018-10-22 16:00:52,985 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 16:00:52,985 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 59 transitions. [2018-10-22 16:00:52,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-22 16:00:52,987 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:52,987 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:52,987 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:52,987 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:52,987 INFO L82 PathProgramCache]: Analyzing trace with hash 1156541018, now seen corresponding path program 9 times [2018-10-22 16:00:52,987 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:52,988 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:52,988 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:52,988 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:52,989 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:53,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:53,790 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-22 16:00:53,790 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:53,791 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:53,791 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:53,791 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:53,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:53,791 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:53,802 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:53,803 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:01:00,819 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:01:00,820 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:00,827 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:00,864 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-22 16:01:00,865 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:03,138 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-10-22 16:01:03,160 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:03,160 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:03,176 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:01:03,176 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:01:03,355 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:01:03,355 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:03,360 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:03,630 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-22 16:01:03,630 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:04,054 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-10-22 16:01:04,056 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:04,057 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 30, 22, 30] total 50 [2018-10-22 16:01:04,057 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:04,057 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 16:01:04,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 16:01:04,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=2163, Unknown=0, NotChecked=0, Total=2450 [2018-10-22 16:01:04,058 INFO L87 Difference]: Start difference. First operand 51 states and 59 transitions. Second operand 22 states. [2018-10-22 16:01:05,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:05,016 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2018-10-22 16:01:05,017 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 16:01:05,017 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 74 [2018-10-22 16:01:05,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:05,019 INFO L225 Difference]: With dead ends: 62 [2018-10-22 16:01:05,019 INFO L226 Difference]: Without dead ends: 57 [2018-10-22 16:01:05,021 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 237 SyntacticMatches, 40 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 478 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=494, Invalid=2928, Unknown=0, NotChecked=0, Total=3422 [2018-10-22 16:01:05,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-22 16:01:05,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2018-10-22 16:01:05,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-10-22 16:01:05,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2018-10-22 16:01:05,028 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 74 [2018-10-22 16:01:05,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:05,028 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2018-10-22 16:01:05,029 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 16:01:05,029 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2018-10-22 16:01:05,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-10-22 16:01:05,030 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:05,030 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:05,031 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:05,031 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:05,031 INFO L82 PathProgramCache]: Analyzing trace with hash -1694050084, now seen corresponding path program 10 times [2018-10-22 16:01:05,031 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:05,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:05,032 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:05,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:05,032 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:05,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:05,477 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-10-22 16:01:05,478 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:05,478 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:05,478 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:05,478 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:05,478 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:05,478 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:01:05,486 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:01:05,487 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:01:05,512 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:01:05,512 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:05,516 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:05,590 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-10-22 16:01:05,590 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:09,019 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:01:09,127 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:01:10,814 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 290 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-22 16:01:10,834 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:10,835 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:10,849 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:01:10,850 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:01:10,915 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:01:10,915 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:10,922 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:11,013 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-10-22 16:01:11,013 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:11,391 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 290 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-22 16:01:11,393 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:11,393 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 33, 24, 33] total 55 [2018-10-22 16:01:11,393 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:11,394 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 16:01:11,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 16:01:11,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=2632, Unknown=1, NotChecked=0, Total=2970 [2018-10-22 16:01:11,396 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand 24 states. [2018-10-22 16:01:12,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:12,391 INFO L93 Difference]: Finished difference Result 66 states and 77 transitions. [2018-10-22 16:01:12,391 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-22 16:01:12,392 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 81 [2018-10-22 16:01:12,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:12,394 INFO L225 Difference]: With dead ends: 66 [2018-10-22 16:01:12,394 INFO L226 Difference]: Without dead ends: 61 [2018-10-22 16:01:12,396 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 366 GetRequests, 260 SyntacticMatches, 43 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 558 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=587, Invalid=3572, Unknown=1, NotChecked=0, Total=4160 [2018-10-22 16:01:12,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-22 16:01:12,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2018-10-22 16:01:12,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-22 16:01:12,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 69 transitions. [2018-10-22 16:01:12,404 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 69 transitions. Word has length 81 [2018-10-22 16:01:12,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:12,404 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 69 transitions. [2018-10-22 16:01:12,404 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 16:01:12,404 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 69 transitions. [2018-10-22 16:01:12,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-10-22 16:01:12,405 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:12,406 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:12,406 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:12,406 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:12,406 INFO L82 PathProgramCache]: Analyzing trace with hash 246445082, now seen corresponding path program 11 times [2018-10-22 16:01:12,406 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:12,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:12,407 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:12,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:12,408 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:12,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:12,921 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-22 16:01:12,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:12,921 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:12,922 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:12,922 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:12,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:12,922 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:01:12,930 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:01:12,930 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:17,865 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 16:01:17,866 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:17,869 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:17,946 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-22 16:01:17,946 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:21,419 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 352 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-10-22 16:01:21,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:21,441 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:21,456 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:01:21,457 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:21,787 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 16:01:21,787 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:21,795 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:21,861 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-22 16:01:21,861 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:22,229 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 352 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-10-22 16:01:22,230 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:22,231 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 36, 26, 36] total 60 [2018-10-22 16:01:22,231 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:22,231 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-22 16:01:22,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-22 16:01:22,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=393, Invalid=3147, Unknown=0, NotChecked=0, Total=3540 [2018-10-22 16:01:22,233 INFO L87 Difference]: Start difference. First operand 59 states and 69 transitions. Second operand 26 states. [2018-10-22 16:01:23,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:23,559 INFO L93 Difference]: Finished difference Result 70 states and 82 transitions. [2018-10-22 16:01:23,564 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-22 16:01:23,564 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 88 [2018-10-22 16:01:23,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:23,565 INFO L225 Difference]: With dead ends: 70 [2018-10-22 16:01:23,565 INFO L226 Difference]: Without dead ends: 65 [2018-10-22 16:01:23,567 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 282 SyntacticMatches, 47 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 705 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=690, Invalid=4280, Unknown=0, NotChecked=0, Total=4970 [2018-10-22 16:01:23,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-10-22 16:01:23,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2018-10-22 16:01:23,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-22 16:01:23,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2018-10-22 16:01:23,575 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 88 [2018-10-22 16:01:23,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:23,576 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2018-10-22 16:01:23,576 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-22 16:01:23,576 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2018-10-22 16:01:23,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-22 16:01:23,577 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:23,577 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:23,578 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:23,578 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:23,578 INFO L82 PathProgramCache]: Analyzing trace with hash 1503352604, now seen corresponding path program 12 times [2018-10-22 16:01:23,578 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:23,579 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:23,579 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:23,579 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:23,579 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:23,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:24,603 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-22 16:01:24,603 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:24,603 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:24,603 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:24,603 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:24,603 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:24,603 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:01:24,612 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:01:24,612 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:01:25,530 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 16:01:25,530 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:25,537 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:25,674 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-22 16:01:25,675 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:28,797 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:01:28,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:28,819 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:28,834 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:01:28,834 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:01:29,170 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 16:01:29,171 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:29,177 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:29,256 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-22 16:01:29,257 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:29,711 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:01:29,713 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:29,714 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 39, 28, 39] total 65 [2018-10-22 16:01:29,714 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:29,714 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-22 16:01:29,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-22 16:01:29,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=452, Invalid=3708, Unknown=0, NotChecked=0, Total=4160 [2018-10-22 16:01:29,716 INFO L87 Difference]: Start difference. First operand 63 states and 74 transitions. Second operand 28 states. [2018-10-22 16:01:30,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:30,852 INFO L93 Difference]: Finished difference Result 74 states and 87 transitions. [2018-10-22 16:01:30,853 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-22 16:01:30,853 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 95 [2018-10-22 16:01:30,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:30,855 INFO L225 Difference]: With dead ends: 74 [2018-10-22 16:01:30,855 INFO L226 Difference]: Without dead ends: 69 [2018-10-22 16:01:30,857 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 304 SyntacticMatches, 51 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 835 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=800, Invalid=5052, Unknown=0, NotChecked=0, Total=5852 [2018-10-22 16:01:30,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-22 16:01:30,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2018-10-22 16:01:30,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-10-22 16:01:30,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 79 transitions. [2018-10-22 16:01:30,864 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 79 transitions. Word has length 95 [2018-10-22 16:01:30,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:30,864 INFO L481 AbstractCegarLoop]: Abstraction has 67 states and 79 transitions. [2018-10-22 16:01:30,864 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-22 16:01:30,865 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 79 transitions. [2018-10-22 16:01:30,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-10-22 16:01:30,866 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:30,866 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:30,866 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:30,866 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:30,867 INFO L82 PathProgramCache]: Analyzing trace with hash 1308454362, now seen corresponding path program 13 times [2018-10-22 16:01:30,867 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:30,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:30,868 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:30,868 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:30,868 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:30,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:31,512 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-10-22 16:01:31,512 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:31,512 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:31,512 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:31,512 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:31,512 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:31,512 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:01:31,520 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:31,520 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:01:31,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:31,556 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:31,841 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-10-22 16:01:31,842 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:35,656 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 494 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-10-22 16:01:35,676 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:35,676 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:35,691 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:35,691 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:01:35,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:35,769 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:35,847 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-10-22 16:01:35,848 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:36,174 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 494 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-10-22 16:01:36,176 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:36,176 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 42, 30, 42] total 70 [2018-10-22 16:01:36,176 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:36,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-22 16:01:36,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-22 16:01:36,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=515, Invalid=4315, Unknown=0, NotChecked=0, Total=4830 [2018-10-22 16:01:36,179 INFO L87 Difference]: Start difference. First operand 67 states and 79 transitions. Second operand 30 states. [2018-10-22 16:01:37,032 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-22 16:01:37,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:37,794 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-10-22 16:01:37,794 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-22 16:01:37,794 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 102 [2018-10-22 16:01:37,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:37,796 INFO L225 Difference]: With dead ends: 78 [2018-10-22 16:01:37,796 INFO L226 Difference]: Without dead ends: 73 [2018-10-22 16:01:37,799 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 326 SyntacticMatches, 55 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 976 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=918, Invalid=5888, Unknown=0, NotChecked=0, Total=6806 [2018-10-22 16:01:37,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-22 16:01:37,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2018-10-22 16:01:37,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-10-22 16:01:37,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 84 transitions. [2018-10-22 16:01:37,805 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 84 transitions. Word has length 102 [2018-10-22 16:01:37,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:37,806 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 84 transitions. [2018-10-22 16:01:37,806 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-22 16:01:37,806 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 84 transitions. [2018-10-22 16:01:37,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-22 16:01:37,807 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:37,808 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:37,808 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:37,808 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:37,808 INFO L82 PathProgramCache]: Analyzing trace with hash 2052449628, now seen corresponding path program 14 times [2018-10-22 16:01:37,808 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:37,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:37,809 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:37,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:37,809 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:37,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:39,268 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-22 16:01:39,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:39,269 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:39,269 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:39,269 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:39,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:39,269 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:01:39,278 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:01:39,278 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:39,315 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:01:39,315 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:39,319 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:39,398 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-22 16:01:39,398 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:45,417 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 574 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-22 16:01:45,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:45,437 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:45,452 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:01:45,452 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:45,537 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:01:45,538 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:45,543 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:45,620 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-22 16:01:45,620 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:46,044 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 574 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-22 16:01:46,046 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:46,046 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 45, 32, 45] total 75 [2018-10-22 16:01:46,046 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:46,046 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-22 16:01:46,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-22 16:01:46,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=581, Invalid=4968, Unknown=1, NotChecked=0, Total=5550 [2018-10-22 16:01:46,049 INFO L87 Difference]: Start difference. First operand 71 states and 84 transitions. Second operand 32 states. [2018-10-22 16:01:48,240 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-22 16:01:48,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:48,751 INFO L93 Difference]: Finished difference Result 82 states and 97 transitions. [2018-10-22 16:01:48,751 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-22 16:01:48,751 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 109 [2018-10-22 16:01:48,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:48,753 INFO L225 Difference]: With dead ends: 82 [2018-10-22 16:01:48,753 INFO L226 Difference]: Without dead ends: 77 [2018-10-22 16:01:48,757 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 348 SyntacticMatches, 59 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1106 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=1043, Invalid=6788, Unknown=1, NotChecked=0, Total=7832 [2018-10-22 16:01:48,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-10-22 16:01:48,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2018-10-22 16:01:48,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-22 16:01:48,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 89 transitions. [2018-10-22 16:01:48,767 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 89 transitions. Word has length 109 [2018-10-22 16:01:48,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:48,768 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 89 transitions. [2018-10-22 16:01:48,768 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-22 16:01:48,768 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 89 transitions. [2018-10-22 16:01:48,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-22 16:01:48,769 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:48,769 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:48,770 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:48,770 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:48,770 INFO L82 PathProgramCache]: Analyzing trace with hash -1489872998, now seen corresponding path program 15 times [2018-10-22 16:01:48,770 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:48,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:48,771 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:48,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:48,771 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:48,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:49,799 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-22 16:01:49,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:49,799 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:49,799 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:49,799 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:49,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:49,800 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:01:49,806 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:01:49,806 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:03:47,609 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:03:47,609 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:48,444 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:48,528 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-22 16:03:48,529 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:54,533 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 660 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-10-22 16:03:54,538 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:54,538 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:03:54,554 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:03:54,554 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:03:55,073 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:03:55,073 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:55,081 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:55,243 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-22 16:03:55,243 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:56,046 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 660 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-10-22 16:03:56,048 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:56,048 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 48, 34, 48] total 80 [2018-10-22 16:03:56,048 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:56,049 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-22 16:03:56,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-22 16:03:56,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=653, Invalid=5667, Unknown=0, NotChecked=0, Total=6320 [2018-10-22 16:03:56,051 INFO L87 Difference]: Start difference. First operand 75 states and 89 transitions. Second operand 34 states. [2018-10-22 16:03:57,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:57,714 INFO L93 Difference]: Finished difference Result 86 states and 102 transitions. [2018-10-22 16:03:57,715 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-22 16:03:57,715 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 116 [2018-10-22 16:03:57,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:57,717 INFO L225 Difference]: With dead ends: 86 [2018-10-22 16:03:57,717 INFO L226 Difference]: Without dead ends: 81 [2018-10-22 16:03:57,718 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 370 SyntacticMatches, 63 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1291 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=1178, Invalid=7752, Unknown=0, NotChecked=0, Total=8930 [2018-10-22 16:03:57,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-22 16:03:57,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2018-10-22 16:03:57,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-22 16:03:57,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 94 transitions. [2018-10-22 16:03:57,725 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 94 transitions. Word has length 116 [2018-10-22 16:03:57,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:57,725 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 94 transitions. [2018-10-22 16:03:57,725 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-22 16:03:57,725 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 94 transitions. [2018-10-22 16:03:57,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-10-22 16:03:57,726 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:57,727 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:57,727 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:57,727 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:57,727 INFO L82 PathProgramCache]: Analyzing trace with hash -111508580, now seen corresponding path program 16 times [2018-10-22 16:03:57,727 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:57,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:57,728 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:57,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:57,728 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:57,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:58,823 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-10-22 16:03:58,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:58,824 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:58,824 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:58,824 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:58,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:58,824 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:03:58,833 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:03:58,834 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:03:58,874 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:03:58,875 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:58,881 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:58,982 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-10-22 16:03:58,982 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:04,767 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 752 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-22 16:04:04,787 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:04,788 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:04:04,804 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:04:04,804 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:04:04,909 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:04:04,909 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:04,916 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:05,015 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-10-22 16:04:05,015 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:05,505 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 752 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-22 16:04:05,508 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:04:05,508 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 51, 36, 51] total 85 [2018-10-22 16:04:05,508 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:04:05,509 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-22 16:04:05,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-22 16:04:05,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=728, Invalid=6412, Unknown=0, NotChecked=0, Total=7140 [2018-10-22 16:04:05,511 INFO L87 Difference]: Start difference. First operand 79 states and 94 transitions. Second operand 36 states. [2018-10-22 16:04:07,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:07,469 INFO L93 Difference]: Finished difference Result 90 states and 107 transitions. [2018-10-22 16:04:07,470 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-22 16:04:07,470 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 123 [2018-10-22 16:04:07,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:07,471 INFO L225 Difference]: With dead ends: 90 [2018-10-22 16:04:07,472 INFO L226 Difference]: Without dead ends: 85 [2018-10-22 16:04:07,473 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 558 GetRequests, 392 SyntacticMatches, 67 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1465 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=1320, Invalid=8780, Unknown=0, NotChecked=0, Total=10100 [2018-10-22 16:04:07,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-22 16:04:07,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2018-10-22 16:04:07,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-10-22 16:04:07,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2018-10-22 16:04:07,479 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 123 [2018-10-22 16:04:07,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:07,480 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2018-10-22 16:04:07,480 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-22 16:04:07,480 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2018-10-22 16:04:07,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2018-10-22 16:04:07,481 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:07,481 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:07,481 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:07,481 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:07,482 INFO L82 PathProgramCache]: Analyzing trace with hash -307547814, now seen corresponding path program 17 times [2018-10-22 16:04:07,482 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:07,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:07,482 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:04:07,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:07,483 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:07,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:08,464 INFO L134 CoverageAnalysis]: Checked inductivity of 986 backedges. 0 proven. 578 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2018-10-22 16:04:08,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:08,465 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:08,465 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:08,465 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:08,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:08,465 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:04:08,474 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:04:08,474 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown