java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/diamond_true-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-0fd1304 [2018-10-23 16:06:24,375 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-23 16:06:24,377 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-23 16:06:24,390 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-23 16:06:24,390 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-23 16:06:24,391 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-23 16:06:24,394 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-23 16:06:24,396 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-23 16:06:24,399 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-23 16:06:24,402 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-23 16:06:24,404 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-23 16:06:24,404 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-23 16:06:24,405 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-23 16:06:24,409 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-23 16:06:24,410 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-23 16:06:24,417 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-23 16:06:24,418 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-23 16:06:24,423 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-23 16:06:24,426 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-23 16:06:24,431 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-23 16:06:24,433 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-23 16:06:24,434 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-23 16:06:24,438 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-23 16:06:24,439 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-23 16:06:24,439 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-23 16:06:24,444 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-23 16:06:24,445 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-23 16:06:24,448 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-23 16:06:24,450 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-23 16:06:24,451 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-23 16:06:24,451 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-23 16:06:24,452 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-23 16:06:24,454 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 [2018-10-23 16:06:24,475 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-23 16:06:24,475 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-23 16:06:24,476 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-23 16:06:24,476 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-23 16:06:24,476 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-23 16:06:24,477 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-23 16:06:24,477 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-23 16:06:24,477 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-23 16:06:24,477 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-23 16:06:24,477 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-23 16:06:24,478 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-23 16:06:24,478 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-23 16:06:24,479 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-23 16:06:24,479 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-23 16:06:24,479 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-23 16:06:24,479 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-23 16:06:24,479 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-23 16:06:24,480 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-23 16:06:24,480 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-23 16:06:24,480 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-23 16:06:24,480 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-23 16:06:24,480 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-23 16:06:24,481 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-23 16:06:24,481 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-23 16:06:24,481 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-23 16:06:24,481 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-23 16:06:24,481 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-23 16:06:24,482 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-23 16:06:24,482 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-23 16:06:24,482 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-23 16:06:24,482 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-23 16:06:24,482 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-23 16:06:24,483 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-23 16:06:24,483 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-23 16:06:24,528 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-23 16:06:24,546 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-23 16:06:24,550 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-23 16:06:24,552 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-23 16:06:24,552 INFO L276 PluginConnector]: CDTParser initialized [2018-10-23 16:06:24,553 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/diamond_true-unreach-call1_true-termination.i [2018-10-23 16:06:24,607 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/757936961/55888867bf5e492899bb01dd796775c4/FLAGa890ae746 [2018-10-23 16:06:25,032 INFO L298 CDTParser]: Found 1 translation units. [2018-10-23 16:06:25,033 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_true-unreach-call1_true-termination.i [2018-10-23 16:06:25,040 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/757936961/55888867bf5e492899bb01dd796775c4/FLAGa890ae746 [2018-10-23 16:06:25,058 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/757936961/55888867bf5e492899bb01dd796775c4 [2018-10-23 16:06:25,072 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-23 16:06:25,073 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-23 16:06:25,074 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-23 16:06:25,074 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-23 16:06:25,077 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-23 16:06:25,078 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 04:06:25" (1/1) ... [2018-10-23 16:06:25,081 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ba9c3c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:06:25, skipping insertion in model container [2018-10-23 16:06:25,081 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 04:06:25" (1/1) ... [2018-10-23 16:06:25,091 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-23 16:06:25,114 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-23 16:06:25,299 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-23 16:06:25,306 INFO L189 MainTranslator]: Completed pre-run [2018-10-23 16:06:25,328 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-23 16:06:25,348 INFO L193 MainTranslator]: Completed translation [2018-10-23 16:06:25,349 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:06:25 WrapperNode [2018-10-23 16:06:25,349 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-23 16:06:25,350 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-23 16:06:25,350 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-23 16:06:25,350 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-23 16:06:25,360 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:06:25" (1/1) ... [2018-10-23 16:06:25,368 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:06:25" (1/1) ... [2018-10-23 16:06:25,375 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-23 16:06:25,376 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-23 16:06:25,377 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-23 16:06:25,377 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-23 16:06:25,385 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:06:25" (1/1) ... [2018-10-23 16:06:25,385 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:06:25" (1/1) ... [2018-10-23 16:06:25,386 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:06:25" (1/1) ... [2018-10-23 16:06:25,386 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:06:25" (1/1) ... [2018-10-23 16:06:25,389 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:06:25" (1/1) ... [2018-10-23 16:06:25,394 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:06:25" (1/1) ... [2018-10-23 16:06:25,395 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:06:25" (1/1) ... [2018-10-23 16:06:25,397 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-23 16:06:25,397 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-23 16:06:25,397 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-23 16:06:25,397 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-23 16:06:25,398 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:06:25" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-23 16:06:25,534 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-23 16:06:25,534 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-23 16:06:25,534 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-23 16:06:25,534 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-23 16:06:25,535 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-23 16:06:25,535 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-23 16:06:25,535 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-23 16:06:25,535 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-23 16:06:25,797 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-23 16:06:25,797 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 04:06:25 BoogieIcfgContainer [2018-10-23 16:06:25,798 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-23 16:06:25,799 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-23 16:06:25,799 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-23 16:06:25,802 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-23 16:06:25,803 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 04:06:25" (1/3) ... [2018-10-23 16:06:25,804 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ed55355 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 04:06:25, skipping insertion in model container [2018-10-23 16:06:25,804 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:06:25" (2/3) ... [2018-10-23 16:06:25,804 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ed55355 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 04:06:25, skipping insertion in model container [2018-10-23 16:06:25,805 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 04:06:25" (3/3) ... [2018-10-23 16:06:25,808 INFO L112 eAbstractionObserver]: Analyzing ICFG diamond_true-unreach-call1_true-termination.i [2018-10-23 16:06:25,818 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-23 16:06:25,826 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-23 16:06:25,844 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-23 16:06:25,883 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-23 16:06:25,883 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-23 16:06:25,883 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-23 16:06:25,883 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-23 16:06:25,884 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-23 16:06:25,884 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-23 16:06:25,884 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-23 16:06:25,884 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-23 16:06:25,904 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-10-23 16:06:25,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-23 16:06:25,911 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:06:25,913 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:06:25,915 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:06:25,922 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:06:25,923 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-10-23 16:06:25,926 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:06:25,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:25,980 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:06:25,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:25,980 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:06:26,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:26,038 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:26,040 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 16:06:26,041 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-23 16:06:26,041 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-23 16:06:26,046 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-23 16:06:26,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-23 16:06:26,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-23 16:06:26,065 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-10-23 16:06:26,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:06:26,095 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-23 16:06:26,096 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-23 16:06:26,097 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-23 16:06:26,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:06:26,105 INFO L225 Difference]: With dead ends: 30 [2018-10-23 16:06:26,106 INFO L226 Difference]: Without dead ends: 13 [2018-10-23 16:06:26,110 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-23 16:06:26,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-23 16:06:26,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-23 16:06:26,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-23 16:06:26,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-10-23 16:06:26,149 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-10-23 16:06:26,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:06:26,149 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-10-23 16:06:26,149 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-23 16:06:26,150 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-10-23 16:06:26,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-23 16:06:26,150 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:06:26,151 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:06:26,151 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:06:26,152 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:06:26,152 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-10-23 16:06:26,152 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:06:26,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:26,153 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:06:26,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:26,154 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:06:26,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:26,356 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:26,357 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 16:06:26,357 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-23 16:06:26,358 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-23 16:06:26,360 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-23 16:06:26,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-23 16:06:26,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 16:06:26,365 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-10-23 16:06:26,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:06:26,527 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2018-10-23 16:06:26,527 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-23 16:06:26,528 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-23 16:06:26,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:06:26,531 INFO L225 Difference]: With dead ends: 21 [2018-10-23 16:06:26,531 INFO L226 Difference]: Without dead ends: 16 [2018-10-23 16:06:26,532 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 16:06:26,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-23 16:06:26,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-10-23 16:06:26,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-23 16:06:26,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-10-23 16:06:26,539 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2018-10-23 16:06:26,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:06:26,539 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-10-23 16:06:26,539 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-23 16:06:26,540 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-10-23 16:06:26,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-23 16:06:26,540 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:06:26,541 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:06:26,541 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:06:26,541 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:06:26,542 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-10-23 16:06:26,542 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:06:26,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:26,543 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:06:26,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:26,544 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:06:26,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:26,737 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:26,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:26,738 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:06:26,739 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-23 16:06:26,741 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [26], [29], [31], [37], [38], [39], [41] [2018-10-23 16:06:26,788 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-23 16:06:26,788 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-23 16:06:26,910 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-23 16:06:27,448 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-23 16:06:27,449 INFO L272 AbstractInterpreter]: Visited 13 different actions 77 times. Merged at 4 different actions 34 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-23 16:06:27,468 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:06:27,469 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-23 16:06:27,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:27,470 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:06:27,491 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:06:27,492 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 16:06:27,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:27,526 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:06:27,599 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:27,599 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:06:27,678 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:27,699 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:06:27,699 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-23 16:06:27,700 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:06:27,701 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-23 16:06:27,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-23 16:06:27,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-23 16:06:27,702 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 4 states. [2018-10-23 16:06:27,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:06:27,837 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2018-10-23 16:06:27,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-23 16:06:27,838 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-23 16:06:27,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:06:27,839 INFO L225 Difference]: With dead ends: 24 [2018-10-23 16:06:27,839 INFO L226 Difference]: Without dead ends: 19 [2018-10-23 16:06:27,840 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-23 16:06:27,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-23 16:06:27,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2018-10-23 16:06:27,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-23 16:06:27,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-10-23 16:06:27,845 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-10-23 16:06:27,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:06:27,846 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-10-23 16:06:27,846 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-23 16:06:27,846 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-10-23 16:06:27,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-23 16:06:27,847 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:06:27,847 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:06:27,847 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:06:27,848 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:06:27,848 INFO L82 PathProgramCache]: Analyzing trace with hash -281914435, now seen corresponding path program 1 times [2018-10-23 16:06:27,848 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:06:27,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:27,849 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:06:27,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:27,850 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:06:27,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:27,999 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:28,000 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:28,000 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:06:28,000 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-23 16:06:28,001 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-23 16:06:28,003 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-23 16:06:28,003 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-23 16:06:28,009 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-23 16:06:28,247 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-23 16:06:28,247 INFO L272 AbstractInterpreter]: Visited 13 different actions 77 times. Merged at 4 different actions 34 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-10-23 16:06:28,275 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:06:28,276 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-23 16:06:28,276 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:28,276 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:06:28,293 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:06:28,293 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 16:06:28,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:28,318 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:06:28,389 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:28,390 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:06:28,659 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:28,698 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:06:28,698 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-23 16:06:28,698 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:06:28,699 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-23 16:06:28,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-23 16:06:28,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-23 16:06:28,701 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 4 states. [2018-10-23 16:06:28,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:06:28,973 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2018-10-23 16:06:28,973 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-23 16:06:28,974 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-23 16:06:28,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:06:28,975 INFO L225 Difference]: With dead ends: 26 [2018-10-23 16:06:28,975 INFO L226 Difference]: Without dead ends: 21 [2018-10-23 16:06:28,975 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-23 16:06:28,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-23 16:06:28,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2018-10-23 16:06:28,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-23 16:06:28,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-10-23 16:06:28,980 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-10-23 16:06:28,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:06:28,981 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-10-23 16:06:28,981 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-23 16:06:28,981 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-10-23 16:06:28,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-23 16:06:28,982 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:06:28,982 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:06:28,982 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:06:28,983 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:06:28,983 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-10-23 16:06:28,983 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:06:28,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:28,984 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:06:28,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:28,985 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:06:28,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:29,384 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:29,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:29,385 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:06:29,385 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:06:29,386 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:06:29,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:29,386 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:06:29,403 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 16:06:29,404 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-23 16:06:29,458 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-23 16:06:29,458 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:06:29,461 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:06:29,538 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:29,539 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:06:29,634 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:29,662 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:06:29,662 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-23 16:06:29,663 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:06:29,663 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-23 16:06:29,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-23 16:06:29,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-23 16:06:29,664 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2018-10-23 16:06:29,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:06:29,858 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2018-10-23 16:06:29,859 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-23 16:06:29,859 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-23 16:06:29,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:06:29,860 INFO L225 Difference]: With dead ends: 29 [2018-10-23 16:06:29,860 INFO L226 Difference]: Without dead ends: 24 [2018-10-23 16:06:29,861 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-23 16:06:29,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-23 16:06:29,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2018-10-23 16:06:29,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-23 16:06:29,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2018-10-23 16:06:29,868 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 17 [2018-10-23 16:06:29,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:06:29,868 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2018-10-23 16:06:29,868 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-23 16:06:29,868 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2018-10-23 16:06:29,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-23 16:06:29,869 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:06:29,869 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:06:29,870 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:06:29,870 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:06:29,870 INFO L82 PathProgramCache]: Analyzing trace with hash -849134272, now seen corresponding path program 1 times [2018-10-23 16:06:29,870 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:06:29,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:29,871 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:06:29,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:29,872 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:06:29,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:29,999 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:29,999 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:30,000 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:06:30,000 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 18 with the following transitions: [2018-10-23 16:06:30,000 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-23 16:06:30,002 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-23 16:06:30,003 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-23 16:06:30,007 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-23 16:06:30,268 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-23 16:06:30,269 INFO L272 AbstractInterpreter]: Visited 14 different actions 87 times. Merged at 5 different actions 34 times. Widened at 1 different actions 5 times. Found 11 fixpoints after 2 different actions. Largest state had 4 variables. [2018-10-23 16:06:30,307 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:06:30,307 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-23 16:06:30,308 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:30,308 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:06:30,324 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:06:30,324 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 16:06:30,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:30,353 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:06:30,595 WARN L179 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 5 [2018-10-23 16:06:30,617 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:30,617 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:06:30,713 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:30,735 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-23 16:06:30,735 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 6 [2018-10-23 16:06:30,735 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-23 16:06:30,735 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-23 16:06:30,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-23 16:06:30,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-23 16:06:30,736 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand 3 states. [2018-10-23 16:06:30,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:06:30,762 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2018-10-23 16:06:30,764 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-23 16:06:30,764 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-10-23 16:06:30,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:06:30,766 INFO L225 Difference]: With dead ends: 35 [2018-10-23 16:06:30,766 INFO L226 Difference]: Without dead ends: 27 [2018-10-23 16:06:30,766 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-23 16:06:30,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-23 16:06:30,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-23 16:06:30,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-23 16:06:30,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2018-10-23 16:06:30,779 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 17 [2018-10-23 16:06:30,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:06:30,779 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2018-10-23 16:06:30,779 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-23 16:06:30,780 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2018-10-23 16:06:30,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-23 16:06:30,780 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:06:30,780 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:06:30,781 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:06:30,781 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:06:30,781 INFO L82 PathProgramCache]: Analyzing trace with hash 1277798652, now seen corresponding path program 2 times [2018-10-23 16:06:30,781 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:06:30,782 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:30,782 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:06:30,782 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:30,782 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:06:30,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:30,969 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:30,969 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:30,969 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:06:30,969 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:06:30,969 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:06:30,970 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:30,970 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:06:30,978 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 16:06:30,979 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-23 16:06:31,004 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-23 16:06:31,005 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:06:31,007 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:06:31,260 WARN L179 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 6 [2018-10-23 16:06:31,276 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:31,277 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:06:31,426 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:31,460 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-23 16:06:31,460 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 6 [2018-10-23 16:06:31,461 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-23 16:06:31,461 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-23 16:06:31,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-23 16:06:31,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-23 16:06:31,462 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 3 states. [2018-10-23 16:06:31,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:06:31,508 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-10-23 16:06:31,508 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-23 16:06:31,508 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-10-23 16:06:31,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:06:31,509 INFO L225 Difference]: With dead ends: 35 [2018-10-23 16:06:31,509 INFO L226 Difference]: Without dead ends: 27 [2018-10-23 16:06:31,510 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-23 16:06:31,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-23 16:06:31,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-23 16:06:31,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-23 16:06:31,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2018-10-23 16:06:31,515 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 17 [2018-10-23 16:06:31,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:06:31,516 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2018-10-23 16:06:31,516 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-23 16:06:31,516 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2018-10-23 16:06:31,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-23 16:06:31,517 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:06:31,517 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:06:31,517 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:06:31,517 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:06:31,517 INFO L82 PathProgramCache]: Analyzing trace with hash -1242161282, now seen corresponding path program 2 times [2018-10-23 16:06:31,517 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:06:31,518 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:31,518 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:06:31,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:31,519 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:06:31,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:31,701 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:31,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:31,702 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:06:31,702 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:06:31,702 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:06:31,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:31,702 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:06:31,718 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 16:06:31,719 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-23 16:06:43,749 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-23 16:06:43,749 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:06:43,751 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:06:43,776 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:43,776 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:06:43,867 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:43,888 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:06:43,888 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-23 16:06:43,888 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:06:43,889 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-23 16:06:43,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-23 16:06:43,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-23 16:06:43,889 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 5 states. [2018-10-23 16:06:43,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:06:43,936 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2018-10-23 16:06:43,936 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-23 16:06:43,936 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-23 16:06:43,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:06:43,937 INFO L225 Difference]: With dead ends: 35 [2018-10-23 16:06:43,938 INFO L226 Difference]: Without dead ends: 30 [2018-10-23 16:06:43,938 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-23 16:06:43,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-23 16:06:43,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-23 16:06:43,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-23 16:06:43,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2018-10-23 16:06:43,944 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 17 [2018-10-23 16:06:43,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:06:43,944 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2018-10-23 16:06:43,944 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-23 16:06:43,944 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2018-10-23 16:06:43,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-23 16:06:43,945 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:06:43,945 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:06:43,945 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:06:43,945 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:06:43,945 INFO L82 PathProgramCache]: Analyzing trace with hash 26004059, now seen corresponding path program 3 times [2018-10-23 16:06:43,946 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:06:43,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:43,946 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:06:43,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:43,947 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:06:43,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:44,075 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:44,075 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:44,075 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:06:44,076 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:06:44,076 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:06:44,076 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:44,076 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:06:44,091 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 16:06:44,091 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 16:06:44,101 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 16:06:44,102 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:06:44,104 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:06:44,128 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:44,129 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:06:44,397 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:44,418 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:06:44,419 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-23 16:06:44,419 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:06:44,419 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-23 16:06:44,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-23 16:06:44,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-23 16:06:44,420 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 6 states. [2018-10-23 16:06:44,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:06:44,512 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2018-10-23 16:06:44,512 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-23 16:06:44,513 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-23 16:06:44,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:06:44,514 INFO L225 Difference]: With dead ends: 38 [2018-10-23 16:06:44,514 INFO L226 Difference]: Without dead ends: 33 [2018-10-23 16:06:44,514 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-23 16:06:44,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-23 16:06:44,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-10-23 16:06:44,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-23 16:06:44,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2018-10-23 16:06:44,521 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 20 [2018-10-23 16:06:44,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:06:44,521 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2018-10-23 16:06:44,521 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-23 16:06:44,521 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2018-10-23 16:06:44,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-23 16:06:44,522 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:06:44,522 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:06:44,523 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:06:44,523 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:06:44,523 INFO L82 PathProgramCache]: Analyzing trace with hash 821178397, now seen corresponding path program 3 times [2018-10-23 16:06:44,523 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:06:44,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:44,524 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:06:44,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:44,524 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:06:44,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:44,981 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:44,981 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:44,981 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:06:44,982 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:06:44,982 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:06:44,982 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:44,982 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:06:44,998 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 16:06:44,998 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 16:06:45,021 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 16:06:45,021 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:06:45,023 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:06:45,034 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:45,034 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:06:45,470 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:45,491 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:06:45,492 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-23 16:06:45,492 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:06:45,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-23 16:06:45,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-23 16:06:45,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-23 16:06:45,494 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 6 states. [2018-10-23 16:06:45,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:06:45,561 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2018-10-23 16:06:45,561 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-23 16:06:45,561 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-23 16:06:45,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:06:45,563 INFO L225 Difference]: With dead ends: 41 [2018-10-23 16:06:45,563 INFO L226 Difference]: Without dead ends: 36 [2018-10-23 16:06:45,564 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-23 16:06:45,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-23 16:06:45,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-10-23 16:06:45,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-23 16:06:45,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2018-10-23 16:06:45,570 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 20 [2018-10-23 16:06:45,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:06:45,570 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2018-10-23 16:06:45,571 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-23 16:06:45,571 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2018-10-23 16:06:45,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-23 16:06:45,572 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:06:45,572 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:06:45,572 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:06:45,573 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:06:45,573 INFO L82 PathProgramCache]: Analyzing trace with hash 427509150, now seen corresponding path program 4 times [2018-10-23 16:06:45,573 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:06:45,574 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:45,574 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:06:45,574 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:45,574 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:06:45,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:45,921 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:45,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:45,922 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:06:45,922 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:06:45,922 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:06:45,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:45,922 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:06:45,932 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:06:45,932 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 16:06:45,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:45,944 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:06:45,966 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:45,967 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:06:46,772 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:46,793 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:06:46,793 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-23 16:06:46,793 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:06:46,794 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-23 16:06:46,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-23 16:06:46,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-23 16:06:46,795 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 7 states. [2018-10-23 16:06:46,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:06:46,879 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2018-10-23 16:06:46,880 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-23 16:06:46,880 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-23 16:06:46,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:06:46,881 INFO L225 Difference]: With dead ends: 44 [2018-10-23 16:06:46,882 INFO L226 Difference]: Without dead ends: 39 [2018-10-23 16:06:46,883 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-23 16:06:46,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-23 16:06:46,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-23 16:06:46,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-23 16:06:46,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-10-23 16:06:46,889 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 23 [2018-10-23 16:06:46,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:06:46,890 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-10-23 16:06:46,890 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-23 16:06:46,890 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-10-23 16:06:46,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-23 16:06:46,891 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:06:46,891 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:06:46,891 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:06:46,891 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:06:46,891 INFO L82 PathProgramCache]: Analyzing trace with hash 201615134, now seen corresponding path program 4 times [2018-10-23 16:06:46,891 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:06:46,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:46,892 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:06:46,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:46,892 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:06:46,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:46,984 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:46,984 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:46,984 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:06:46,985 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:06:46,985 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:06:46,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:46,985 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:06:46,996 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:06:46,996 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 16:06:47,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:47,010 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:06:47,036 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:47,036 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:06:47,472 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:47,492 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:06:47,492 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-23 16:06:47,492 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:06:47,493 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-23 16:06:47,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-23 16:06:47,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-23 16:06:47,494 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 7 states. [2018-10-23 16:06:47,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:06:47,667 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2018-10-23 16:06:47,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-23 16:06:47,668 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-23 16:06:47,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:06:47,669 INFO L225 Difference]: With dead ends: 47 [2018-10-23 16:06:47,669 INFO L226 Difference]: Without dead ends: 42 [2018-10-23 16:06:47,670 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-23 16:06:47,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-23 16:06:47,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-10-23 16:06:47,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-23 16:06:47,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2018-10-23 16:06:47,674 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 23 [2018-10-23 16:06:47,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:06:47,675 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2018-10-23 16:06:47,675 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-23 16:06:47,675 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2018-10-23 16:06:47,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-23 16:06:47,676 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:06:47,676 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:06:47,676 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:06:47,676 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:06:47,676 INFO L82 PathProgramCache]: Analyzing trace with hash 181755771, now seen corresponding path program 5 times [2018-10-23 16:06:47,677 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:06:47,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:47,677 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:06:47,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:47,678 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:06:47,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:47,884 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:47,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:47,885 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:06:47,885 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:06:47,885 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:06:47,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:47,886 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:06:47,894 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 16:06:47,894 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-23 16:06:47,979 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-23 16:06:47,979 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:06:47,981 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:06:48,014 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:48,014 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:06:48,384 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:48,406 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:06:48,406 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-23 16:06:48,406 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:06:48,407 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-23 16:06:48,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-23 16:06:48,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-23 16:06:48,408 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 8 states. [2018-10-23 16:06:48,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:06:48,524 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2018-10-23 16:06:48,525 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-23 16:06:48,525 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-23 16:06:48,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:06:48,526 INFO L225 Difference]: With dead ends: 50 [2018-10-23 16:06:48,526 INFO L226 Difference]: Without dead ends: 45 [2018-10-23 16:06:48,527 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-23 16:06:48,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-23 16:06:48,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-10-23 16:06:48,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-23 16:06:48,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2018-10-23 16:06:48,534 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 26 [2018-10-23 16:06:48,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:06:48,534 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2018-10-23 16:06:48,534 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-23 16:06:48,534 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2018-10-23 16:06:48,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-23 16:06:48,535 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:06:48,536 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:06:48,536 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:06:48,536 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:06:48,536 INFO L82 PathProgramCache]: Analyzing trace with hash -1733081987, now seen corresponding path program 5 times [2018-10-23 16:06:48,536 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:06:48,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:48,537 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:06:48,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:06:48,538 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:06:48,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:06:48,732 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:06:48,733 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:48,733 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:06:48,733 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:06:48,733 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:06:48,733 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:06:48,733 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:06:48,744 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 16:06:48,745 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-23 16:07:00,777 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-23 16:07:00,777 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:07:00,779 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:07:01,391 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 16:07:01,391 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:07:19,766 WARN L179 SmtUtils]: Spent 4.05 s on a formula simplification. DAG size of input: 43 DAG size of output: 21 [2018-10-23 16:07:25,809 WARN L832 $PredicateComparison]: unable to prove that (forall ((main_~x~0 Int) (v_prenex_1 Int)) (let ((.cse1 (+ main_~x~0 1)) (.cse0 (mod v_prenex_1 2))) (or (= .cse0 (mod .cse1 2)) (= .cse0 0) (< (mod .cse1 4294967296) 99) (<= 99 (mod main_~x~0 4294967296)) (= 0 (mod (+ .cse0 4294967294) 4294967296))))) is different from false [2018-10-23 16:07:27,822 WARN L854 $PredicateComparison]: unable to prove that (forall ((main_~x~0 Int) (v_prenex_1 Int)) (let ((.cse1 (+ main_~x~0 1)) (.cse0 (mod v_prenex_1 2))) (or (= .cse0 (mod .cse1 2)) (= .cse0 0) (< (mod .cse1 4294967296) 99) (<= 99 (mod main_~x~0 4294967296)) (= 0 (mod (+ .cse0 4294967294) 4294967296))))) is different from true [2018-10-23 16:07:27,834 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 1 not checked. [2018-10-23 16:07:27,856 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-10-23 16:07:27,856 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [8, 8] total 19 [2018-10-23 16:07:27,857 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-23 16:07:27,857 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-23 16:07:27,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-23 16:07:27,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=244, Unknown=8, NotChecked=32, Total=342 [2018-10-23 16:07:27,858 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 7 states. [2018-10-23 16:07:29,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:07:29,999 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-10-23 16:07:29,999 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-23 16:07:30,000 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 26 [2018-10-23 16:07:30,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:07:30,001 INFO L225 Difference]: With dead ends: 49 [2018-10-23 16:07:30,001 INFO L226 Difference]: Without dead ends: 30 [2018-10-23 16:07:30,002 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 24.8s TimeCoverageRelationStatistics Valid=70, Invalid=305, Unknown=9, NotChecked=36, Total=420 [2018-10-23 16:07:30,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-23 16:07:30,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-23 16:07:30,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-23 16:07:30,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-23 16:07:30,010 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 26 [2018-10-23 16:07:30,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:07:30,010 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-23 16:07:30,010 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-23 16:07:30,010 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-23 16:07:30,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-23 16:07:30,011 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:07:30,011 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:07:30,011 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:07:30,011 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:07:30,012 INFO L82 PathProgramCache]: Analyzing trace with hash 1862081662, now seen corresponding path program 6 times [2018-10-23 16:07:30,012 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:07:30,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:07:30,013 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:07:30,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:07:30,013 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:07:30,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:07:30,263 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:07:30,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:07:30,264 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:07:30,264 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:07:30,264 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:07:30,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:07:30,265 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:07:30,272 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 16:07:30,272 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 16:07:30,286 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 16:07:30,286 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:07:30,287 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:07:30,309 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:07:30,309 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:07:31,583 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:07:31,603 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:07:31,604 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-23 16:07:31,604 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:07:31,604 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-23 16:07:31,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-23 16:07:31,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-23 16:07:31,606 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 9 states. [2018-10-23 16:07:31,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:07:31,741 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-23 16:07:31,741 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-23 16:07:31,742 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-23 16:07:31,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:07:31,743 INFO L225 Difference]: With dead ends: 39 [2018-10-23 16:07:31,743 INFO L226 Difference]: Without dead ends: 34 [2018-10-23 16:07:31,744 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-23 16:07:31,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-23 16:07:31,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-10-23 16:07:31,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-23 16:07:31,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-23 16:07:31,749 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 29 [2018-10-23 16:07:31,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:07:31,749 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-23 16:07:31,749 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-23 16:07:31,749 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-23 16:07:31,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-23 16:07:31,750 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:07:31,750 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:07:31,750 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:07:31,751 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:07:31,751 INFO L82 PathProgramCache]: Analyzing trace with hash -1688101733, now seen corresponding path program 7 times [2018-10-23 16:07:31,751 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:07:31,752 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:07:31,752 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:07:31,752 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:07:31,752 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:07:31,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:07:31,903 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:07:31,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:07:31,904 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:07:31,904 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:07:31,904 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:07:31,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:07:31,904 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:07:31,912 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:07:31,912 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 16:07:31,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:07:31,924 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:07:31,932 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:07:31,933 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:07:32,931 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:07:32,956 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:07:32,956 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-23 16:07:32,957 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:07:32,957 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-23 16:07:32,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-23 16:07:32,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-23 16:07:32,958 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 10 states. [2018-10-23 16:07:33,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:07:33,194 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-23 16:07:33,194 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-23 16:07:33,194 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-23 16:07:33,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:07:33,195 INFO L225 Difference]: With dead ends: 42 [2018-10-23 16:07:33,195 INFO L226 Difference]: Without dead ends: 37 [2018-10-23 16:07:33,197 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-23 16:07:33,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-23 16:07:33,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2018-10-23 16:07:33,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-23 16:07:33,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-23 16:07:33,209 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 32 [2018-10-23 16:07:33,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:07:33,209 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-23 16:07:33,209 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-23 16:07:33,209 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-23 16:07:33,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-23 16:07:33,210 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:07:33,211 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:07:33,213 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:07:33,213 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:07:33,213 INFO L82 PathProgramCache]: Analyzing trace with hash -1631958178, now seen corresponding path program 8 times [2018-10-23 16:07:33,214 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:07:33,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:07:33,215 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:07:33,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:07:33,215 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:07:33,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:07:33,403 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:07:33,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:07:33,403 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:07:33,403 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:07:33,404 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:07:33,404 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:07:33,404 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:07:33,416 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 16:07:33,416 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-23 16:07:36,583 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-23 16:07:36,583 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:07:36,586 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:07:36,598 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:07:36,599 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:07:38,835 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:07:38,856 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:07:38,856 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-23 16:07:38,856 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:07:38,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-23 16:07:38,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-23 16:07:38,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-23 16:07:38,857 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 11 states. [2018-10-23 16:07:39,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:07:39,016 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-23 16:07:39,018 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-23 16:07:39,018 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-10-23 16:07:39,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:07:39,019 INFO L225 Difference]: With dead ends: 45 [2018-10-23 16:07:39,019 INFO L226 Difference]: Without dead ends: 40 [2018-10-23 16:07:39,020 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-23 16:07:39,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-23 16:07:39,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-10-23 16:07:39,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-23 16:07:39,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-23 16:07:39,025 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 35 [2018-10-23 16:07:39,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:07:39,025 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-23 16:07:39,025 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-23 16:07:39,025 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-23 16:07:39,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-23 16:07:39,026 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:07:39,027 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:07:39,027 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:07:39,027 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:07:39,027 INFO L82 PathProgramCache]: Analyzing trace with hash 198410683, now seen corresponding path program 9 times [2018-10-23 16:07:39,027 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:07:39,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:07:39,028 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:07:39,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:07:39,029 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:07:39,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:07:39,227 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:07:39,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:07:39,227 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:07:39,227 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:07:39,227 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:07:39,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:07:39,227 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:07:39,234 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 16:07:39,235 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 16:07:39,247 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 16:07:39,247 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:07:39,249 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:07:39,282 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:07:39,283 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:07:43,827 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:07:43,847 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:07:43,847 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-23 16:07:43,847 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:07:43,847 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-23 16:07:43,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-23 16:07:43,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-23 16:07:43,848 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 12 states. [2018-10-23 16:07:44,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:07:44,052 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-23 16:07:44,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-23 16:07:44,052 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-10-23 16:07:44,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:07:44,053 INFO L225 Difference]: With dead ends: 48 [2018-10-23 16:07:44,054 INFO L226 Difference]: Without dead ends: 43 [2018-10-23 16:07:44,055 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-23 16:07:44,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-23 16:07:44,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-10-23 16:07:44,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-23 16:07:44,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-23 16:07:44,060 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 38 [2018-10-23 16:07:44,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:07:44,060 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-23 16:07:44,061 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-23 16:07:44,061 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-23 16:07:44,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-23 16:07:44,062 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:07:44,062 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:07:44,062 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:07:44,062 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:07:44,063 INFO L82 PathProgramCache]: Analyzing trace with hash -187641282, now seen corresponding path program 10 times [2018-10-23 16:07:44,063 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:07:44,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:07:44,063 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:07:44,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:07:44,064 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:07:44,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:07:44,272 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:07:44,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:07:44,272 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:07:44,272 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:07:44,272 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:07:44,273 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:07:44,273 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:07:44,280 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:07:44,280 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 16:07:44,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:07:44,296 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:07:44,361 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:07:44,361 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:07:47,687 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:07:47,707 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:07:47,708 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-23 16:07:47,708 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:07:47,708 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-23 16:07:47,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-23 16:07:47,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-23 16:07:47,709 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 13 states. [2018-10-23 16:07:47,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:07:47,954 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-23 16:07:47,955 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-23 16:07:47,955 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-10-23 16:07:47,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:07:47,956 INFO L225 Difference]: With dead ends: 51 [2018-10-23 16:07:47,957 INFO L226 Difference]: Without dead ends: 46 [2018-10-23 16:07:47,958 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-23 16:07:47,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-23 16:07:47,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-10-23 16:07:47,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-23 16:07:47,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-10-23 16:07:47,962 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 41 [2018-10-23 16:07:47,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:07:47,962 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-10-23 16:07:47,962 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-23 16:07:47,962 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-10-23 16:07:47,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-23 16:07:47,963 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:07:47,963 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:07:47,963 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:07:47,964 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:07:47,964 INFO L82 PathProgramCache]: Analyzing trace with hash 860688091, now seen corresponding path program 11 times [2018-10-23 16:07:47,964 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:07:47,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:07:47,965 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:07:47,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:07:47,965 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:07:47,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:07:48,211 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:07:48,212 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:07:48,212 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:07:48,212 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:07:48,212 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:07:48,212 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:07:48,212 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:07:48,221 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 16:07:48,221 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-23 16:07:54,552 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-23 16:07:54,553 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:07:54,626 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:07:54,635 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:07:54,635 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:07:59,117 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:07:59,137 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:07:59,137 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-23 16:07:59,137 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:07:59,138 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-23 16:07:59,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-23 16:07:59,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-23 16:07:59,138 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 14 states. [2018-10-23 16:07:59,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:07:59,441 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-23 16:07:59,442 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-23 16:07:59,442 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-23 16:07:59,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:07:59,443 INFO L225 Difference]: With dead ends: 54 [2018-10-23 16:07:59,443 INFO L226 Difference]: Without dead ends: 49 [2018-10-23 16:07:59,444 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-23 16:07:59,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-23 16:07:59,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2018-10-23 16:07:59,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-23 16:07:59,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-23 16:07:59,450 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 44 [2018-10-23 16:07:59,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:07:59,451 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-23 16:07:59,451 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-23 16:07:59,451 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-23 16:07:59,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-23 16:07:59,451 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:07:59,451 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:07:59,452 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:07:59,452 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:07:59,452 INFO L82 PathProgramCache]: Analyzing trace with hash -1361137378, now seen corresponding path program 12 times [2018-10-23 16:07:59,452 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:07:59,452 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:07:59,453 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:07:59,453 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:07:59,453 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:07:59,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:08:00,247 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:08:00,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:08:00,248 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:08:00,248 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:08:00,248 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:08:00,248 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:08:00,248 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 16:08:00,256 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 16:08:00,256 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 16:08:00,272 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 16:08:00,272 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:08:00,274 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:08:00,306 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:08:00,307 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:08:04,412 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:08:04,432 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:08:04,433 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-23 16:08:04,433 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:08:04,433 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-23 16:08:04,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-23 16:08:04,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-23 16:08:04,434 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 15 states. [2018-10-23 16:08:04,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:08:04,743 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-23 16:08:04,744 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-23 16:08:04,744 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-10-23 16:08:04,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:08:04,745 INFO L225 Difference]: With dead ends: 57 [2018-10-23 16:08:04,745 INFO L226 Difference]: Without dead ends: 52 [2018-10-23 16:08:04,746 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-23 16:08:04,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-23 16:08:04,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2018-10-23 16:08:04,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-23 16:08:04,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-10-23 16:08:04,750 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 47 [2018-10-23 16:08:04,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:08:04,751 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-10-23 16:08:04,751 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-23 16:08:04,751 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-10-23 16:08:04,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-23 16:08:04,752 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:08:04,752 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:08:04,752 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:08:04,752 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:08:04,753 INFO L82 PathProgramCache]: Analyzing trace with hash -2022685701, now seen corresponding path program 13 times [2018-10-23 16:08:04,753 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:08:04,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:08:04,754 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:08:04,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:08:04,754 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:08:04,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:08:05,285 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:08:05,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:08:05,285 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:08:05,285 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:08:05,286 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:08:05,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:08:05,286 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:08:05,302 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:08:05,303 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 16:08:05,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:08:05,333 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:08:05,412 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:08:05,412 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:08:10,026 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:08:10,046 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:08:10,046 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-23 16:08:10,046 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:08:10,046 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-23 16:08:10,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-23 16:08:10,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-23 16:08:10,047 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 16 states. [2018-10-23 16:08:10,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:08:10,367 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-23 16:08:10,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-23 16:08:10,368 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-10-23 16:08:10,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:08:10,369 INFO L225 Difference]: With dead ends: 60 [2018-10-23 16:08:10,370 INFO L226 Difference]: Without dead ends: 55 [2018-10-23 16:08:10,370 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-23 16:08:10,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-23 16:08:10,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-10-23 16:08:10,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-23 16:08:10,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-23 16:08:10,374 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 50 [2018-10-23 16:08:10,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:08:10,374 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-23 16:08:10,374 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-23 16:08:10,374 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-23 16:08:10,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-23 16:08:10,375 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:08:10,375 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:08:10,375 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:08:10,375 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:08:10,376 INFO L82 PathProgramCache]: Analyzing trace with hash -603854850, now seen corresponding path program 14 times [2018-10-23 16:08:10,376 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:08:10,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:08:10,376 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:08:10,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:08:10,376 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:08:10,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:08:10,663 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:08:10,663 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:08:10,663 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:08:10,663 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:08:10,663 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:08:10,663 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:08:10,663 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 16:08:10,672 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 16:08:10,672 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-23 16:09:08,609 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-23 16:09:08,610 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:09:08,674 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:09:08,700 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:08,700 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:09:14,619 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:14,640 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:09:14,641 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-23 16:09:14,641 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:09:14,641 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-23 16:09:14,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-23 16:09:14,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-23 16:09:14,642 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 17 states. [2018-10-23 16:09:15,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:09:15,210 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-23 16:09:15,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-23 16:09:15,218 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-10-23 16:09:15,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:09:15,218 INFO L225 Difference]: With dead ends: 63 [2018-10-23 16:09:15,219 INFO L226 Difference]: Without dead ends: 58 [2018-10-23 16:09:15,219 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-23 16:09:15,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-23 16:09:15,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-10-23 16:09:15,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-23 16:09:15,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-10-23 16:09:15,223 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 53 [2018-10-23 16:09:15,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:09:15,223 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-10-23 16:09:15,223 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-23 16:09:15,223 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-10-23 16:09:15,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-23 16:09:15,224 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:09:15,224 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:09:15,224 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:09:15,225 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:09:15,225 INFO L82 PathProgramCache]: Analyzing trace with hash 1012867355, now seen corresponding path program 15 times [2018-10-23 16:09:15,226 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:09:15,226 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:15,226 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:09:15,226 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:15,227 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:09:15,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:09:15,802 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:15,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:15,803 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:09:15,803 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:09:15,803 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:09:15,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:15,803 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:09:15,820 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 16:09:15,821 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 16:09:15,843 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 16:09:15,843 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:09:15,845 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:09:15,870 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:15,870 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:09:21,705 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:21,725 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:09:21,725 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-23 16:09:21,725 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:09:21,726 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-23 16:09:21,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-23 16:09:21,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-23 16:09:21,726 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 18 states. [2018-10-23 16:09:22,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:09:22,113 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-23 16:09:22,114 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-23 16:09:22,115 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-10-23 16:09:22,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:09:22,115 INFO L225 Difference]: With dead ends: 66 [2018-10-23 16:09:22,115 INFO L226 Difference]: Without dead ends: 61 [2018-10-23 16:09:22,116 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-23 16:09:22,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-23 16:09:22,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2018-10-23 16:09:22,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-23 16:09:22,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-10-23 16:09:22,120 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 56 [2018-10-23 16:09:22,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:09:22,121 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-10-23 16:09:22,121 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-23 16:09:22,121 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-10-23 16:09:22,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-23 16:09:22,121 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:09:22,122 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:09:22,122 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:09:22,122 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:09:22,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1020819166, now seen corresponding path program 16 times [2018-10-23 16:09:22,122 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:09:22,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:22,123 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:09:22,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:22,123 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:09:22,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:09:23,058 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:23,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:23,058 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:09:23,059 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:09:23,059 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:09:23,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:23,059 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 16:09:23,066 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:09:23,066 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 16:09:23,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:09:23,086 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:09:23,098 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:23,098 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:09:30,841 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:30,861 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:09:30,861 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-23 16:09:30,861 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:09:30,862 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-23 16:09:30,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-23 16:09:30,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-23 16:09:30,863 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 19 states. [2018-10-23 16:09:31,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:09:31,321 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-23 16:09:31,322 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-23 16:09:31,322 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-10-23 16:09:31,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:09:31,323 INFO L225 Difference]: With dead ends: 69 [2018-10-23 16:09:31,323 INFO L226 Difference]: Without dead ends: 64 [2018-10-23 16:09:31,324 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-23 16:09:31,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-23 16:09:31,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2018-10-23 16:09:31,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-23 16:09:31,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-10-23 16:09:31,328 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 59 [2018-10-23 16:09:31,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:09:31,328 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-10-23 16:09:31,328 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-23 16:09:31,328 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-10-23 16:09:31,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-23 16:09:31,329 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:09:31,329 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:09:31,329 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:09:31,329 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:09:31,329 INFO L82 PathProgramCache]: Analyzing trace with hash 1690019387, now seen corresponding path program 17 times [2018-10-23 16:09:31,329 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:09:31,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:31,330 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:09:31,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:31,330 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:09:31,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:09:32,552 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:32,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:32,553 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:09:32,553 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:09:32,553 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:09:32,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:32,553 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:09:32,561 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 16:09:32,561 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-23 16:09:53,310 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-23 16:09:53,310 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:09:53,392 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:09:53,421 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:53,421 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:10:01,135 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:01,156 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:10:01,156 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-23 16:10:01,156 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:10:01,156 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-23 16:10:01,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-23 16:10:01,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-23 16:10:01,158 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 20 states. [2018-10-23 16:10:01,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:10:01,854 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-23 16:10:01,854 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-23 16:10:01,854 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-10-23 16:10:01,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:10:01,856 INFO L225 Difference]: With dead ends: 72 [2018-10-23 16:10:01,856 INFO L226 Difference]: Without dead ends: 67 [2018-10-23 16:10:01,857 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-23 16:10:01,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-23 16:10:01,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2018-10-23 16:10:01,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-23 16:10:01,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-10-23 16:10:01,861 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 62 [2018-10-23 16:10:01,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:10:01,861 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-10-23 16:10:01,861 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-23 16:10:01,861 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-10-23 16:10:01,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-23 16:10:01,862 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:10:01,862 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:10:01,862 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:10:01,863 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:10:01,863 INFO L82 PathProgramCache]: Analyzing trace with hash 595615166, now seen corresponding path program 18 times [2018-10-23 16:10:01,863 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:10:01,863 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:10:01,863 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:10:01,863 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:10:01,864 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:10:01,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:10:02,186 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:02,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:10:02,186 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:10:02,186 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:10:02,186 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:10:02,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:10:02,186 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 16:10:02,194 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 16:10:02,194 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 16:10:02,216 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 16:10:02,216 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:10:02,218 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:10:02,242 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:02,243 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:10:11,729 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:11,750 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:10:11,750 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-23 16:10:11,750 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:10:11,750 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-23 16:10:11,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-23 16:10:11,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-10-23 16:10:11,752 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 21 states. [2018-10-23 16:10:12,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:10:12,269 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-23 16:10:12,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-23 16:10:12,269 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-10-23 16:10:12,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:10:12,270 INFO L225 Difference]: With dead ends: 75 [2018-10-23 16:10:12,270 INFO L226 Difference]: Without dead ends: 70 [2018-10-23 16:10:12,271 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-10-23 16:10:12,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-23 16:10:12,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2018-10-23 16:10:12,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-23 16:10:12,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-10-23 16:10:12,274 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 65 [2018-10-23 16:10:12,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:10:12,274 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-10-23 16:10:12,274 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-23 16:10:12,274 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-10-23 16:10:12,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-23 16:10:12,274 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:10:12,274 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:10:12,275 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:10:12,275 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:10:12,275 INFO L82 PathProgramCache]: Analyzing trace with hash 296211291, now seen corresponding path program 19 times [2018-10-23 16:10:12,275 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:10:12,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:10:12,276 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:10:12,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:10:12,276 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:10:12,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:10:12,680 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:12,680 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:10:12,681 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:10:12,681 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:10:12,681 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:10:12,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:10:12,681 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:10:12,695 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:10:12,696 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 16:10:12,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:10:12,726 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:10:12,793 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:12,794 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:10:26,126 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:26,146 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:10:26,147 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-23 16:10:26,147 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:10:26,147 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-23 16:10:26,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-23 16:10:26,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-23 16:10:26,148 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 22 states. [2018-10-23 16:10:26,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:10:26,717 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-23 16:10:26,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-23 16:10:26,717 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-10-23 16:10:26,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:10:26,718 INFO L225 Difference]: With dead ends: 78 [2018-10-23 16:10:26,718 INFO L226 Difference]: Without dead ends: 73 [2018-10-23 16:10:26,719 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-23 16:10:26,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-23 16:10:26,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2018-10-23 16:10:26,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-23 16:10:26,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2018-10-23 16:10:26,723 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 68 [2018-10-23 16:10:26,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:10:26,723 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2018-10-23 16:10:26,723 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-23 16:10:26,723 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2018-10-23 16:10:26,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-23 16:10:26,724 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:10:26,724 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:10:26,724 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:10:26,724 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:10:26,724 INFO L82 PathProgramCache]: Analyzing trace with hash 1402444958, now seen corresponding path program 20 times [2018-10-23 16:10:26,724 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:10:26,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:10:26,725 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:10:26,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:10:26,725 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:10:26,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:10:27,866 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:27,866 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:10:27,866 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:10:27,866 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:10:27,866 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:10:27,866 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:10:27,867 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 16:10:27,874 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 16:10:27,874 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-23 16:10:50,802 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-23 16:10:50,803 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:10:50,837 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:10:51,121 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:51,121 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:10:51,813 WARN L179 SmtUtils]: Spent 239.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:10:54,759 WARN L179 SmtUtils]: Spent 512.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:10:55,055 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:10:59,497 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:10:59,516 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:59,543 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:10:59,543 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 24] total 45 [2018-10-23 16:10:59,543 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:10:59,543 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-23 16:10:59,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-23 16:10:59,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2018-10-23 16:10:59,544 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand 23 states. [2018-10-23 16:11:00,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:11:00,221 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-23 16:11:00,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-23 16:11:00,222 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2018-10-23 16:11:00,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:11:00,223 INFO L225 Difference]: With dead ends: 81 [2018-10-23 16:11:00,223 INFO L226 Difference]: Without dead ends: 76 [2018-10-23 16:11:00,225 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 111 SyntacticMatches, 11 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2018-10-23 16:11:00,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-23 16:11:00,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2018-10-23 16:11:00,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-23 16:11:00,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-10-23 16:11:00,233 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 71 [2018-10-23 16:11:00,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:11:00,233 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-10-23 16:11:00,233 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-23 16:11:00,233 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-10-23 16:11:00,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-23 16:11:00,234 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:11:00,234 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:11:00,234 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:11:00,234 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:11:00,235 INFO L82 PathProgramCache]: Analyzing trace with hash 1925556347, now seen corresponding path program 21 times [2018-10-23 16:11:00,235 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:11:00,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:11:00,235 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:11:00,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:11:00,236 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:11:00,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:11:00,644 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:11:00,645 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:11:00,645 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:11:00,645 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:11:00,645 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:11:00,645 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:11:00,645 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:11:00,653 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 16:11:00,653 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 16:11:00,677 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 16:11:00,678 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:11:00,679 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:11:00,693 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:11:00,694 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-10-23 16:11:00,720 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-23 16:11:00,921 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:11:00,921 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-23 16:11:00,928 WARN L205 ceAbstractionStarter]: Timeout [2018-10-23 16:11:00,928 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 04:11:00 BoogieIcfgContainer [2018-10-23 16:11:00,928 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-23 16:11:00,929 INFO L168 Benchmark]: Toolchain (without parser) took 275856.64 ms. Allocated memory was 1.5 GB in the beginning and 2.5 GB in the end (delta: 951.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -814.6 MB). Peak memory consumption was 136.5 MB. Max. memory is 7.1 GB. [2018-10-23 16:11:00,930 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-23 16:11:00,930 INFO L168 Benchmark]: CACSL2BoogieTranslator took 275.17 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-23 16:11:00,931 INFO L168 Benchmark]: Boogie Procedure Inliner took 25.93 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-23 16:11:00,931 INFO L168 Benchmark]: Boogie Preprocessor took 20.27 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-23 16:11:00,931 INFO L168 Benchmark]: RCFGBuilder took 400.78 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 748.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -787.9 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. [2018-10-23 16:11:00,932 INFO L168 Benchmark]: TraceAbstraction took 275129.43 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 202.9 MB). Free memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: -37.2 MB). Peak memory consumption was 165.7 MB. Max. memory is 7.1 GB. [2018-10-23 16:11:00,936 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 275.17 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 25.93 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 20.27 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 400.78 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 748.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -787.9 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 275129.43 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 202.9 MB). Free memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: -37.2 MB). Peak memory consumption was 165.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 75 with TraceHistMax 22,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 24 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. TIMEOUT Result, 275.0s OverallTime, 30 OverallIterations, 22 TraceHistogramMax, 9.5s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 557 SDtfs, 31 SDslu, 5148 SDs, 0 SdLazy, 7346 SolverSat, 5 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 6.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2286 GetRequests, 1706 SyntacticMatches, 63 SemanticMatches, 517 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 121.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=75occurred in iteration=29, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 1.3s AbstIntTime, 3 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 29 MinimizatonAttempts, 31 StatesRemovedByMinimization, 27 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 135.8s SatisfiabilityAnalysisTime, 126.0s InterpolantComputationTime, 1989 NumberOfCodeBlocks, 1980 NumberOfCodeBlocksAsserted, 146 NumberOfCheckSat, 2890 ConstructedInterpolants, 2 QuantifiedInterpolants, 787822 SizeOfPredicates, 32 NumberOfNonLiveVariables, 2017 ConjunctsInSsa, 532 ConjunctsInUnsatCore, 83 InterpolantComputations, 7 PerfectInterpolantSequences, 107/13542 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown