java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT-LIM.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_true-unreach-call2_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 22:06:13,614 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 22:06:13,616 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 22:06:13,628 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 22:06:13,628 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 22:06:13,629 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 22:06:13,630 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 22:06:13,632 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 22:06:13,635 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 22:06:13,639 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 22:06:13,640 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 22:06:13,640 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 22:06:13,641 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 22:06:13,644 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 22:06:13,646 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 22:06:13,647 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 22:06:13,648 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 22:06:13,651 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 22:06:13,653 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 22:06:13,655 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 22:06:13,656 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 22:06:13,659 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 22:06:13,665 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-11-07 22:06:13,676 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT-LIM.epf [2018-11-07 22:06:13,696 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 22:06:13,697 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 22:06:13,697 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 22:06:13,698 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 22:06:13,698 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 22:06:13,698 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 22:06:13,698 INFO L133 SettingsManager]: * Maximum recursion depth of evaluation operations=6 [2018-11-07 22:06:13,698 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 22:06:13,699 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 22:06:13,699 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 22:06:13,700 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 22:06:13,700 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 22:06:13,700 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 22:06:13,701 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 22:06:13,701 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 22:06:13,701 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 22:06:13,701 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 22:06:13,701 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 22:06:13,703 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 22:06:13,703 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 22:06:13,704 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 22:06:13,704 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 22:06:13,704 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 22:06:13,704 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 22:06:13,704 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 22:06:13,705 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 22:06:13,705 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 22:06:13,705 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 22:06:13,705 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 22:06:13,706 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 22:06:13,706 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 22:06:13,706 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 22:06:13,706 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 22:06:13,707 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 22:06:13,707 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 22:06:13,769 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 22:06:13,784 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 22:06:13,788 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 22:06:13,790 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 22:06:13,790 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 22:06:13,791 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_true-unreach-call2_true-termination.i [2018-11-07 22:06:13,860 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6c5c9340c/bafba4885bd04071afbd4094ddb42b76/FLAG68dff9969 [2018-11-07 22:06:14,315 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 22:06:14,315 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_true-unreach-call2_true-termination.i [2018-11-07 22:06:14,322 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6c5c9340c/bafba4885bd04071afbd4094ddb42b76/FLAG68dff9969 [2018-11-07 22:06:14,337 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6c5c9340c/bafba4885bd04071afbd4094ddb42b76 [2018-11-07 22:06:14,348 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 22:06:14,350 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 22:06:14,351 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 22:06:14,351 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 22:06:14,355 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 22:06:14,356 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:06:14" (1/1) ... [2018-11-07 22:06:14,359 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a760589 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:06:14, skipping insertion in model container [2018-11-07 22:06:14,359 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:06:14" (1/1) ... [2018-11-07 22:06:14,369 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 22:06:14,390 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 22:06:14,613 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:06:14,617 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 22:06:14,639 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:06:14,661 INFO L193 MainTranslator]: Completed translation [2018-11-07 22:06:14,661 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:06:14 WrapperNode [2018-11-07 22:06:14,662 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 22:06:14,662 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 22:06:14,663 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 22:06:14,663 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 22:06:14,673 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:06:14" (1/1) ... [2018-11-07 22:06:14,682 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:06:14" (1/1) ... [2018-11-07 22:06:14,689 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 22:06:14,690 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 22:06:14,690 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 22:06:14,690 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 22:06:14,700 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:06:14" (1/1) ... [2018-11-07 22:06:14,701 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:06:14" (1/1) ... [2018-11-07 22:06:14,702 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:06:14" (1/1) ... [2018-11-07 22:06:14,703 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:06:14" (1/1) ... [2018-11-07 22:06:14,709 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:06:14" (1/1) ... [2018-11-07 22:06:14,716 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:06:14" (1/1) ... [2018-11-07 22:06:14,718 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:06:14" (1/1) ... [2018-11-07 22:06:14,726 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 22:06:14,727 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 22:06:14,727 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 22:06:14,728 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 22:06:14,729 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:06:14" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:14,863 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2018-11-07 22:06:14,864 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 22:06:14,864 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 22:06:14,864 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-11-07 22:06:14,864 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 22:06:14,864 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 22:06:14,865 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 22:06:14,865 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 22:06:14,865 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2018-11-07 22:06:14,865 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 22:06:14,865 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 22:06:14,866 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-11-07 22:06:15,223 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 22:06:15,223 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:06:15 BoogieIcfgContainer [2018-11-07 22:06:15,224 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 22:06:15,225 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 22:06:15,225 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 22:06:15,228 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 22:06:15,228 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 10:06:14" (1/3) ... [2018-11-07 22:06:15,229 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@242e2112 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:06:15, skipping insertion in model container [2018-11-07 22:06:15,229 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:06:14" (2/3) ... [2018-11-07 22:06:15,230 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@242e2112 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:06:15, skipping insertion in model container [2018-11-07 22:06:15,230 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:06:15" (3/3) ... [2018-11-07 22:06:15,232 INFO L112 eAbstractionObserver]: Analyzing ICFG array_true-unreach-call2_true-termination.i [2018-11-07 22:06:15,242 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 22:06:15,250 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 22:06:15,268 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 22:06:15,299 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 22:06:15,299 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 22:06:15,299 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 22:06:15,300 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 22:06:15,300 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 22:06:15,300 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 22:06:15,300 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 22:06:15,300 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 22:06:15,319 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2018-11-07 22:06:15,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-11-07 22:06:15,326 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:15,327 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:15,329 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:15,335 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:15,335 INFO L82 PathProgramCache]: Analyzing trace with hash 1453247475, now seen corresponding path program 1 times [2018-11-07 22:06:15,338 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:15,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:15,387 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:15,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:15,388 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:15,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:15,471 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:15,473 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:06:15,473 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 22:06:15,474 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:06:15,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 22:06:15,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 22:06:15,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 22:06:15,493 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 2 states. [2018-11-07 22:06:15,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:15,514 INFO L93 Difference]: Finished difference Result 50 states and 53 transitions. [2018-11-07 22:06:15,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 22:06:15,515 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-11-07 22:06:15,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:15,523 INFO L225 Difference]: With dead ends: 50 [2018-11-07 22:06:15,523 INFO L226 Difference]: Without dead ends: 21 [2018-11-07 22:06:15,526 INFO L604 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 [2018-11-07 22:06:15,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-11-07 22:06:15,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-11-07 22:06:15,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-07 22:06:15,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-11-07 22:06:15,566 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 15 [2018-11-07 22:06:15,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:15,567 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-11-07 22:06:15,567 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 22:06:15,567 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-11-07 22:06:15,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-11-07 22:06:15,568 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:15,568 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:15,569 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:15,569 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:15,569 INFO L82 PathProgramCache]: Analyzing trace with hash 1440079151, now seen corresponding path program 1 times [2018-11-07 22:06:15,569 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:15,571 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:15,571 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:15,571 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:15,571 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:15,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:15,662 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:15,663 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:06:15,663 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-07 22:06:15,663 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:06:15,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 22:06:15,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 22:06:15,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 22:06:15,666 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 3 states. [2018-11-07 22:06:15,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:15,741 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-11-07 22:06:15,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 22:06:15,742 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2018-11-07 22:06:15,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:15,743 INFO L225 Difference]: With dead ends: 34 [2018-11-07 22:06:15,743 INFO L226 Difference]: Without dead ends: 27 [2018-11-07 22:06:15,744 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 22:06:15,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-11-07 22:06:15,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2018-11-07 22:06:15,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-11-07 22:06:15,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-11-07 22:06:15,751 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 16 [2018-11-07 22:06:15,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:15,751 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-11-07 22:06:15,751 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 22:06:15,751 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-11-07 22:06:15,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-11-07 22:06:15,752 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:15,753 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:15,753 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:15,753 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:15,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1634508201, now seen corresponding path program 1 times [2018-11-07 22:06:15,754 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:15,759 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:15,759 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:15,759 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:15,759 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:15,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:15,885 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:15,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:15,886 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:15,887 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 23 with the following transitions: [2018-11-07 22:06:15,888 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [6], [7], [11], [14], [16], [17], [18], [19], [21], [25], [26], [34], [37], [39], [45], [46], [47], [49] [2018-11-07 22:06:15,917 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 22:06:15,917 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 22:06:16,155 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 22:06:16,156 INFO L272 AbstractInterpreter]: Visited 21 different actions 56 times. Merged at 6 different actions 30 times. Widened at 1 different actions 1 times. Found 1 fixpoints after 1 different actions. Largest state had 20 variables. [2018-11-07 22:06:16,173 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:16,174 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 22:06:16,174 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:16,174 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:16,186 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:16,187 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:06:16,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:16,224 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:16,285 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:16,285 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:16,392 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:16,422 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:16,422 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2018-11-07 22:06:16,423 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:16,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-07 22:06:16,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-07 22:06:16,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-11-07 22:06:16,424 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 5 states. [2018-11-07 22:06:16,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:16,513 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-11-07 22:06:16,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-07 22:06:16,514 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 22 [2018-11-07 22:06:16,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:16,516 INFO L225 Difference]: With dead ends: 40 [2018-11-07 22:06:16,516 INFO L226 Difference]: Without dead ends: 33 [2018-11-07 22:06:16,517 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-11-07 22:06:16,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-07 22:06:16,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 29. [2018-11-07 22:06:16,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-11-07 22:06:16,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-11-07 22:06:16,523 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 22 [2018-11-07 22:06:16,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:16,524 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-11-07 22:06:16,524 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-07 22:06:16,524 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-11-07 22:06:16,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-11-07 22:06:16,525 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:16,525 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:16,525 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:16,525 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:16,526 INFO L82 PathProgramCache]: Analyzing trace with hash -2041419393, now seen corresponding path program 2 times [2018-11-07 22:06:16,526 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:16,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:16,527 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:16,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:16,527 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:16,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:16,757 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:16,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:16,758 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:16,759 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:16,759 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:16,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:16,759 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:16,773 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:06:16,774 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:06:16,813 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 22:06:16,813 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:16,816 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:16,844 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:16,844 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:16,992 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:17,012 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:17,012 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-11-07 22:06:17,012 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:17,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 22:06:17,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 22:06:17,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-11-07 22:06:17,014 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 6 states. [2018-11-07 22:06:17,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:17,077 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-11-07 22:06:17,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 22:06:17,077 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2018-11-07 22:06:17,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:17,079 INFO L225 Difference]: With dead ends: 46 [2018-11-07 22:06:17,079 INFO L226 Difference]: Without dead ends: 39 [2018-11-07 22:06:17,079 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-11-07 22:06:17,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-11-07 22:06:17,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 35. [2018-11-07 22:06:17,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-11-07 22:06:17,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-11-07 22:06:17,085 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 28 [2018-11-07 22:06:17,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:17,086 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-11-07 22:06:17,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 22:06:17,086 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-11-07 22:06:17,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-11-07 22:06:17,087 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:17,087 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:17,087 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:17,088 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:17,088 INFO L82 PathProgramCache]: Analyzing trace with hash -227970393, now seen corresponding path program 3 times [2018-11-07 22:06:17,088 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:17,089 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:17,089 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:17,089 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:17,089 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:17,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:17,266 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:17,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:17,267 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:17,267 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:17,268 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:17,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:17,268 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:17,283 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:06:17,283 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:06:17,322 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:06:17,322 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:17,326 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:17,351 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:17,351 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:17,478 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:17,498 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:17,499 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2018-11-07 22:06:17,499 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:17,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 22:06:17,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 22:06:17,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-11-07 22:06:17,502 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 7 states. [2018-11-07 22:06:17,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:17,568 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-11-07 22:06:17,570 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 22:06:17,570 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 34 [2018-11-07 22:06:17,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:17,571 INFO L225 Difference]: With dead ends: 52 [2018-11-07 22:06:17,571 INFO L226 Difference]: Without dead ends: 45 [2018-11-07 22:06:17,572 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-11-07 22:06:17,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-07 22:06:17,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 41. [2018-11-07 22:06:17,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-11-07 22:06:17,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-11-07 22:06:17,578 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 34 [2018-11-07 22:06:17,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:17,581 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-11-07 22:06:17,581 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 22:06:17,581 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-11-07 22:06:17,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-11-07 22:06:17,584 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:17,584 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:17,584 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:17,584 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:17,585 INFO L82 PathProgramCache]: Analyzing trace with hash 223280591, now seen corresponding path program 4 times [2018-11-07 22:06:17,585 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:17,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:17,586 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:17,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:17,586 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:17,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:17,899 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:17,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:17,900 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:17,901 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:17,901 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:17,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:17,901 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:17,917 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:17,917 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:06:17,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:17,964 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:18,049 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:18,049 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:18,165 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:18,185 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:18,185 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-11-07 22:06:18,185 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:18,186 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-07 22:06:18,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-07 22:06:18,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-11-07 22:06:18,186 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 8 states. [2018-11-07 22:06:18,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:18,277 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-11-07 22:06:18,277 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-07 22:06:18,278 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 40 [2018-11-07 22:06:18,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:18,279 INFO L225 Difference]: With dead ends: 58 [2018-11-07 22:06:18,279 INFO L226 Difference]: Without dead ends: 51 [2018-11-07 22:06:18,279 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-11-07 22:06:18,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-11-07 22:06:18,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 47. [2018-11-07 22:06:18,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-11-07 22:06:18,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-11-07 22:06:18,286 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 40 [2018-11-07 22:06:18,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:18,286 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-11-07 22:06:18,286 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-07 22:06:18,286 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-11-07 22:06:18,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-11-07 22:06:18,288 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:18,288 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:18,288 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:18,288 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:18,289 INFO L82 PathProgramCache]: Analyzing trace with hash -291927305, now seen corresponding path program 5 times [2018-11-07 22:06:18,289 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:18,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:18,290 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:18,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:18,290 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:18,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:18,414 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:18,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:18,415 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:18,415 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:18,415 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:18,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:18,416 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:18,427 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:06:18,427 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:06:18,490 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 22:06:18,490 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:18,495 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:18,517 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:18,518 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:18,730 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:18,750 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:18,750 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-11-07 22:06:18,750 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:18,751 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 22:06:18,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 22:06:18,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-11-07 22:06:18,752 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 9 states. [2018-11-07 22:06:18,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:18,852 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2018-11-07 22:06:18,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-07 22:06:18,852 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 46 [2018-11-07 22:06:18,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:18,854 INFO L225 Difference]: With dead ends: 64 [2018-11-07 22:06:18,854 INFO L226 Difference]: Without dead ends: 57 [2018-11-07 22:06:18,855 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-11-07 22:06:18,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-07 22:06:18,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 53. [2018-11-07 22:06:18,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-11-07 22:06:18,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-11-07 22:06:18,861 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 46 [2018-11-07 22:06:18,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:18,861 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-11-07 22:06:18,862 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 22:06:18,862 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-11-07 22:06:18,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-11-07 22:06:18,863 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:18,863 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:18,864 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:18,864 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:18,864 INFO L82 PathProgramCache]: Analyzing trace with hash 1124047391, now seen corresponding path program 6 times [2018-11-07 22:06:18,864 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:18,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:18,865 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:18,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:18,866 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:18,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:19,088 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:19,088 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:19,088 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:19,089 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:19,089 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:19,089 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:19,089 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:19,097 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:06:19,097 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:06:19,153 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:06:19,153 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:19,157 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:19,252 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:19,253 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:19,690 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:19,710 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:19,710 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2018-11-07 22:06:19,710 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:19,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 22:06:19,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 22:06:19,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-11-07 22:06:19,712 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 10 states. [2018-11-07 22:06:19,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:19,875 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2018-11-07 22:06:19,876 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-07 22:06:19,876 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 52 [2018-11-07 22:06:19,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:19,878 INFO L225 Difference]: With dead ends: 70 [2018-11-07 22:06:19,878 INFO L226 Difference]: Without dead ends: 63 [2018-11-07 22:06:19,879 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-11-07 22:06:19,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-11-07 22:06:19,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 59. [2018-11-07 22:06:19,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-11-07 22:06:19,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-11-07 22:06:19,885 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 52 [2018-11-07 22:06:19,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:19,885 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-11-07 22:06:19,886 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 22:06:19,886 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-11-07 22:06:19,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-11-07 22:06:19,887 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:19,887 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:19,887 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:19,887 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:19,887 INFO L82 PathProgramCache]: Analyzing trace with hash -195581113, now seen corresponding path program 7 times [2018-11-07 22:06:19,888 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:19,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:19,889 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:19,889 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:19,889 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:19,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:20,141 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:20,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:20,142 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:20,142 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:20,142 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:20,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:20,142 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:20,150 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:20,151 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:06:20,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:20,179 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:20,204 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:20,205 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:20,411 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:20,434 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:20,435 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-11-07 22:06:20,435 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:20,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-07 22:06:20,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-07 22:06:20,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-11-07 22:06:20,436 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 11 states. [2018-11-07 22:06:20,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:20,513 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2018-11-07 22:06:20,513 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 22:06:20,514 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 58 [2018-11-07 22:06:20,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:20,516 INFO L225 Difference]: With dead ends: 76 [2018-11-07 22:06:20,516 INFO L226 Difference]: Without dead ends: 69 [2018-11-07 22:06:20,517 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-11-07 22:06:20,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-11-07 22:06:20,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 65. [2018-11-07 22:06:20,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-11-07 22:06:20,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-11-07 22:06:20,524 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 58 [2018-11-07 22:06:20,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:20,524 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-11-07 22:06:20,524 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-07 22:06:20,525 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-11-07 22:06:20,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-11-07 22:06:20,526 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:20,526 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:20,526 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:20,526 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:20,527 INFO L82 PathProgramCache]: Analyzing trace with hash -778551697, now seen corresponding path program 8 times [2018-11-07 22:06:20,527 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:20,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:20,528 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:20,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:20,528 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:20,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:20,721 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 0 proven. 184 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:20,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:20,722 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:20,722 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:20,722 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:20,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:20,722 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:20,733 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:06:20,733 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:06:20,778 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 22:06:20,779 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:20,783 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:20,817 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 0 proven. 184 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:20,817 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:21,034 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 0 proven. 184 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:21,054 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:21,054 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-11-07 22:06:21,054 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:21,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-07 22:06:21,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-07 22:06:21,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-11-07 22:06:21,056 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 12 states. [2018-11-07 22:06:21,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:21,158 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2018-11-07 22:06:21,159 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 22:06:21,159 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 64 [2018-11-07 22:06:21,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:21,160 INFO L225 Difference]: With dead ends: 82 [2018-11-07 22:06:21,160 INFO L226 Difference]: Without dead ends: 75 [2018-11-07 22:06:21,162 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-11-07 22:06:21,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-11-07 22:06:21,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 71. [2018-11-07 22:06:21,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-11-07 22:06:21,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2018-11-07 22:06:21,168 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 64 [2018-11-07 22:06:21,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:21,169 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2018-11-07 22:06:21,169 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-07 22:06:21,169 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2018-11-07 22:06:21,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-11-07 22:06:21,170 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:21,170 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:21,170 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:21,170 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:21,171 INFO L82 PathProgramCache]: Analyzing trace with hash 920114071, now seen corresponding path program 9 times [2018-11-07 22:06:21,171 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:21,171 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:21,171 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:21,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:21,172 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:21,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:21,643 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:21,644 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:21,644 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:21,644 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:21,644 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:21,644 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:21,644 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:21,655 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:06:21,655 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:06:21,694 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:06:21,695 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:21,698 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:21,724 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:21,724 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:22,214 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:22,233 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:22,234 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2018-11-07 22:06:22,234 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:22,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 22:06:22,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 22:06:22,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-07 22:06:22,236 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 13 states. [2018-11-07 22:06:22,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:22,345 INFO L93 Difference]: Finished difference Result 88 states and 88 transitions. [2018-11-07 22:06:22,346 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-07 22:06:22,346 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 70 [2018-11-07 22:06:22,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:22,348 INFO L225 Difference]: With dead ends: 88 [2018-11-07 22:06:22,348 INFO L226 Difference]: Without dead ends: 81 [2018-11-07 22:06:22,349 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-07 22:06:22,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-11-07 22:06:22,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 77. [2018-11-07 22:06:22,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-11-07 22:06:22,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2018-11-07 22:06:22,356 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 70 [2018-11-07 22:06:22,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:22,356 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2018-11-07 22:06:22,356 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 22:06:22,357 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2018-11-07 22:06:22,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-11-07 22:06:22,358 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:22,358 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:22,358 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:22,359 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:22,359 INFO L82 PathProgramCache]: Analyzing trace with hash -1253250369, now seen corresponding path program 10 times [2018-11-07 22:06:22,359 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:22,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:22,360 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:22,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:22,360 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:22,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:22,588 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 0 proven. 290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:22,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:22,589 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:22,589 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:22,589 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:22,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:22,590 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:22,603 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:22,603 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:06:22,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:22,630 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:22,667 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 0 proven. 290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:22,667 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:23,009 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 0 proven. 290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:23,030 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:23,030 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-11-07 22:06:23,030 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:23,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 22:06:23,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 22:06:23,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-11-07 22:06:23,033 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 14 states. [2018-11-07 22:06:23,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:23,124 INFO L93 Difference]: Finished difference Result 94 states and 94 transitions. [2018-11-07 22:06:23,125 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 22:06:23,125 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 76 [2018-11-07 22:06:23,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:23,126 INFO L225 Difference]: With dead ends: 94 [2018-11-07 22:06:23,126 INFO L226 Difference]: Without dead ends: 87 [2018-11-07 22:06:23,127 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-11-07 22:06:23,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-11-07 22:06:23,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 83. [2018-11-07 22:06:23,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-11-07 22:06:23,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2018-11-07 22:06:23,132 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 76 [2018-11-07 22:06:23,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:23,132 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2018-11-07 22:06:23,133 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 22:06:23,133 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2018-11-07 22:06:23,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-11-07 22:06:23,134 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:23,134 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:23,134 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:23,134 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:23,135 INFO L82 PathProgramCache]: Analyzing trace with hash -1152515097, now seen corresponding path program 11 times [2018-11-07 22:06:23,135 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:23,136 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:23,136 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:23,136 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:23,136 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:23,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:23,502 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 0 proven. 352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:23,503 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:23,503 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:23,503 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:23,503 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:23,503 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:23,503 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:23,512 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:06:23,513 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:06:23,636 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 22:06:23,636 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:23,639 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:23,670 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 0 proven. 352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:23,670 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:24,469 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 0 proven. 352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:24,497 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:24,497 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-11-07 22:06:24,498 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:24,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-07 22:06:24,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-07 22:06:24,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-11-07 22:06:24,499 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 15 states. [2018-11-07 22:06:24,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:24,606 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2018-11-07 22:06:24,606 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 22:06:24,607 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 82 [2018-11-07 22:06:24,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:24,608 INFO L225 Difference]: With dead ends: 100 [2018-11-07 22:06:24,608 INFO L226 Difference]: Without dead ends: 93 [2018-11-07 22:06:24,609 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-11-07 22:06:24,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-11-07 22:06:24,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 89. [2018-11-07 22:06:24,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-11-07 22:06:24,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2018-11-07 22:06:24,614 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 82 [2018-11-07 22:06:24,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:24,615 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2018-11-07 22:06:24,615 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-07 22:06:24,615 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2018-11-07 22:06:24,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-11-07 22:06:24,616 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:24,616 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:24,617 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:24,617 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:24,617 INFO L82 PathProgramCache]: Analyzing trace with hash 1011982095, now seen corresponding path program 12 times [2018-11-07 22:06:24,617 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:24,618 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:24,618 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:24,618 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:24,618 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:24,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:24,886 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:24,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:24,886 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:24,886 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:24,886 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:24,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:24,886 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:24,895 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:06:24,895 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:06:24,955 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:06:24,955 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:24,958 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:25,054 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:25,055 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:25,424 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:25,444 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:25,444 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2018-11-07 22:06:25,444 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:25,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 22:06:25,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 22:06:25,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-11-07 22:06:25,446 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 16 states. [2018-11-07 22:06:25,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:25,685 INFO L93 Difference]: Finished difference Result 106 states and 106 transitions. [2018-11-07 22:06:25,685 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 22:06:25,685 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 88 [2018-11-07 22:06:25,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:25,686 INFO L225 Difference]: With dead ends: 106 [2018-11-07 22:06:25,686 INFO L226 Difference]: Without dead ends: 99 [2018-11-07 22:06:25,687 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 163 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-11-07 22:06:25,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-11-07 22:06:25,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 95. [2018-11-07 22:06:25,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-11-07 22:06:25,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2018-11-07 22:06:25,697 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 88 [2018-11-07 22:06:25,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:25,698 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2018-11-07 22:06:25,698 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 22:06:25,698 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2018-11-07 22:06:25,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-11-07 22:06:25,702 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:25,702 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:25,703 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:25,703 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:25,703 INFO L82 PathProgramCache]: Analyzing trace with hash 1492007991, now seen corresponding path program 13 times [2018-11-07 22:06:25,703 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:25,705 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:25,706 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:25,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:25,706 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:25,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:26,705 INFO L134 CoverageAnalysis]: Checked inductivity of 494 backedges. 0 proven. 494 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:26,706 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:26,706 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:26,706 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:26,706 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:26,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:26,707 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:26,717 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:26,718 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:06:26,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:26,753 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:26,786 INFO L134 CoverageAnalysis]: Checked inductivity of 494 backedges. 0 proven. 494 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:26,786 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:27,347 INFO L134 CoverageAnalysis]: Checked inductivity of 494 backedges. 0 proven. 494 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:27,366 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:27,366 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-11-07 22:06:27,366 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:27,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-07 22:06:27,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-07 22:06:27,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-11-07 22:06:27,368 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 17 states. [2018-11-07 22:06:27,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:27,467 INFO L93 Difference]: Finished difference Result 112 states and 112 transitions. [2018-11-07 22:06:27,467 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 22:06:27,467 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 94 [2018-11-07 22:06:27,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:27,469 INFO L225 Difference]: With dead ends: 112 [2018-11-07 22:06:27,469 INFO L226 Difference]: Without dead ends: 105 [2018-11-07 22:06:27,470 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-11-07 22:06:27,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-11-07 22:06:27,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 101. [2018-11-07 22:06:27,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-11-07 22:06:27,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2018-11-07 22:06:27,475 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 94 [2018-11-07 22:06:27,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:27,475 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2018-11-07 22:06:27,475 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-07 22:06:27,475 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2018-11-07 22:06:27,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-11-07 22:06:27,477 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:27,477 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:27,477 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:27,477 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:27,477 INFO L82 PathProgramCache]: Analyzing trace with hash 114973535, now seen corresponding path program 14 times [2018-11-07 22:06:27,477 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:27,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:27,478 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:27,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:27,478 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:27,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:27,752 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 0 proven. 574 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:27,752 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:27,752 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:27,753 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:27,753 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:27,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:27,753 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:27,762 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:06:27,762 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:06:27,910 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-07 22:06:27,911 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:27,915 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:27,947 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 0 proven. 574 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:27,947 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:28,237 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 0 proven. 574 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:28,257 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:28,257 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-11-07 22:06:28,257 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:28,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 22:06:28,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 22:06:28,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 22:06:28,258 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 18 states. [2018-11-07 22:06:28,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:28,391 INFO L93 Difference]: Finished difference Result 118 states and 118 transitions. [2018-11-07 22:06:28,392 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 22:06:28,392 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 100 [2018-11-07 22:06:28,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:28,393 INFO L225 Difference]: With dead ends: 118 [2018-11-07 22:06:28,393 INFO L226 Difference]: Without dead ends: 111 [2018-11-07 22:06:28,394 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 22:06:28,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-11-07 22:06:28,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 107. [2018-11-07 22:06:28,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-11-07 22:06:28,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2018-11-07 22:06:28,397 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 100 [2018-11-07 22:06:28,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:28,398 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2018-11-07 22:06:28,398 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 22:06:28,398 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2018-11-07 22:06:28,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2018-11-07 22:06:28,399 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:28,399 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:28,400 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:28,400 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:28,400 INFO L82 PathProgramCache]: Analyzing trace with hash -1192461177, now seen corresponding path program 15 times [2018-11-07 22:06:28,400 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:28,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:28,401 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:28,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:28,401 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:28,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:29,496 INFO L134 CoverageAnalysis]: Checked inductivity of 660 backedges. 0 proven. 660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:29,496 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:29,496 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:29,497 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:29,497 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:29,497 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:29,497 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:29,505 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:06:29,505 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:06:29,615 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:06:29,615 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:29,619 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:29,650 INFO L134 CoverageAnalysis]: Checked inductivity of 660 backedges. 0 proven. 660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:29,650 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:30,489 INFO L134 CoverageAnalysis]: Checked inductivity of 660 backedges. 0 proven. 660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:30,509 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:30,510 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2018-11-07 22:06:30,510 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:30,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 22:06:30,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 22:06:30,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 22:06:30,511 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 19 states. [2018-11-07 22:06:30,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:30,616 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2018-11-07 22:06:30,616 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-07 22:06:30,617 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 106 [2018-11-07 22:06:30,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:30,618 INFO L225 Difference]: With dead ends: 124 [2018-11-07 22:06:30,618 INFO L226 Difference]: Without dead ends: 117 [2018-11-07 22:06:30,619 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 196 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 22:06:30,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-11-07 22:06:30,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 113. [2018-11-07 22:06:30,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2018-11-07 22:06:30,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2018-11-07 22:06:30,623 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 106 [2018-11-07 22:06:30,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:30,623 INFO L480 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2018-11-07 22:06:30,623 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 22:06:30,623 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2018-11-07 22:06:30,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2018-11-07 22:06:30,624 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:30,624 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:30,625 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:30,625 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:30,625 INFO L82 PathProgramCache]: Analyzing trace with hash 119218095, now seen corresponding path program 16 times [2018-11-07 22:06:30,625 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:30,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:30,626 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:30,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:30,626 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:30,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:30,841 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 0 proven. 752 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:30,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:30,841 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:30,842 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:30,842 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:30,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:30,842 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:30,851 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:30,851 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:06:30,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:30,895 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:30,990 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 0 proven. 752 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:30,990 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:31,826 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 0 proven. 752 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:31,845 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:31,846 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-11-07 22:06:31,846 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:31,846 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-07 22:06:31,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-07 22:06:31,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-11-07 22:06:31,847 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 20 states. [2018-11-07 22:06:31,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:31,994 INFO L93 Difference]: Finished difference Result 130 states and 130 transitions. [2018-11-07 22:06:31,996 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 22:06:31,996 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 112 [2018-11-07 22:06:31,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:31,997 INFO L225 Difference]: With dead ends: 130 [2018-11-07 22:06:31,997 INFO L226 Difference]: Without dead ends: 123 [2018-11-07 22:06:31,998 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 207 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-11-07 22:06:31,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-11-07 22:06:32,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 119. [2018-11-07 22:06:32,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-11-07 22:06:32,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2018-11-07 22:06:32,001 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 112 [2018-11-07 22:06:32,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:32,002 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2018-11-07 22:06:32,002 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-07 22:06:32,002 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2018-11-07 22:06:32,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2018-11-07 22:06:32,003 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:32,003 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:32,003 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:32,003 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:32,003 INFO L82 PathProgramCache]: Analyzing trace with hash 1451017431, now seen corresponding path program 17 times [2018-11-07 22:06:32,004 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:32,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:32,004 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:32,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:32,005 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:32,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:32,356 INFO L134 CoverageAnalysis]: Checked inductivity of 850 backedges. 0 proven. 850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:32,356 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:32,357 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:32,357 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:32,357 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:32,357 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:32,357 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:32,365 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:06:32,365 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:06:32,645 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-11-07 22:06:32,646 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:32,649 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:32,726 INFO L134 CoverageAnalysis]: Checked inductivity of 850 backedges. 0 proven. 850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:32,726 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:33,147 INFO L134 CoverageAnalysis]: Checked inductivity of 850 backedges. 0 proven. 850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:33,168 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:33,168 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-11-07 22:06:33,168 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:33,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-07 22:06:33,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-07 22:06:33,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-11-07 22:06:33,169 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 21 states. [2018-11-07 22:06:33,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:33,310 INFO L93 Difference]: Finished difference Result 136 states and 136 transitions. [2018-11-07 22:06:33,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-07 22:06:33,311 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 118 [2018-11-07 22:06:33,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:33,312 INFO L225 Difference]: With dead ends: 136 [2018-11-07 22:06:33,313 INFO L226 Difference]: Without dead ends: 129 [2018-11-07 22:06:33,314 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 218 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-11-07 22:06:33,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-11-07 22:06:33,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 125. [2018-11-07 22:06:33,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-11-07 22:06:33,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2018-11-07 22:06:33,319 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 118 [2018-11-07 22:06:33,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:33,319 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2018-11-07 22:06:33,319 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-07 22:06:33,319 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2018-11-07 22:06:33,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2018-11-07 22:06:33,320 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:33,320 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:33,320 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:33,320 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:33,321 INFO L82 PathProgramCache]: Analyzing trace with hash -2125992961, now seen corresponding path program 18 times [2018-11-07 22:06:33,321 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:33,321 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:33,321 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:33,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:33,322 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:33,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:33,818 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 0 proven. 954 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:33,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:33,818 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:33,818 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:33,818 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:33,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:33,818 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:33,827 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:06:33,827 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:06:34,860 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:06:34,860 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:34,864 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:34,901 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 0 proven. 954 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:34,901 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:35,358 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 0 proven. 954 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:35,379 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:35,379 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2018-11-07 22:06:35,379 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:35,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 22:06:35,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 22:06:35,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-11-07 22:06:35,380 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 22 states. [2018-11-07 22:06:35,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:35,530 INFO L93 Difference]: Finished difference Result 142 states and 142 transitions. [2018-11-07 22:06:35,531 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-07 22:06:35,531 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 124 [2018-11-07 22:06:35,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:35,532 INFO L225 Difference]: With dead ends: 142 [2018-11-07 22:06:35,532 INFO L226 Difference]: Without dead ends: 135 [2018-11-07 22:06:35,533 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 229 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-11-07 22:06:35,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-11-07 22:06:35,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 131. [2018-11-07 22:06:35,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-11-07 22:06:35,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 131 transitions. [2018-11-07 22:06:35,537 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 131 transitions. Word has length 124 [2018-11-07 22:06:35,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:35,537 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 131 transitions. [2018-11-07 22:06:35,537 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 22:06:35,538 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 131 transitions. [2018-11-07 22:06:35,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2018-11-07 22:06:35,538 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:35,539 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:35,539 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:35,539 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:35,539 INFO L82 PathProgramCache]: Analyzing trace with hash 2127762727, now seen corresponding path program 19 times [2018-11-07 22:06:35,539 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:35,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:35,540 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:35,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:35,540 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:35,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:35,798 INFO L134 CoverageAnalysis]: Checked inductivity of 1064 backedges. 0 proven. 1064 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:35,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:35,798 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:35,798 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:35,798 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:35,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:35,798 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:35,809 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:35,809 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:06:35,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:35,845 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:35,920 INFO L134 CoverageAnalysis]: Checked inductivity of 1064 backedges. 0 proven. 1064 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:35,920 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:36,673 INFO L134 CoverageAnalysis]: Checked inductivity of 1064 backedges. 0 proven. 1064 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:36,692 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:36,693 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-11-07 22:06:36,693 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:36,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-07 22:06:36,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-07 22:06:36,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-11-07 22:06:36,694 INFO L87 Difference]: Start difference. First operand 131 states and 131 transitions. Second operand 23 states. [2018-11-07 22:06:36,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:36,814 INFO L93 Difference]: Finished difference Result 148 states and 148 transitions. [2018-11-07 22:06:36,814 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 22:06:36,814 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 130 [2018-11-07 22:06:36,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:36,816 INFO L225 Difference]: With dead ends: 148 [2018-11-07 22:06:36,816 INFO L226 Difference]: Without dead ends: 141 [2018-11-07 22:06:36,818 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 240 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-11-07 22:06:36,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2018-11-07 22:06:36,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 137. [2018-11-07 22:06:36,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2018-11-07 22:06:36,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 137 transitions. [2018-11-07 22:06:36,822 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 137 transitions. Word has length 130 [2018-11-07 22:06:36,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:36,822 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 137 transitions. [2018-11-07 22:06:36,822 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-07 22:06:36,823 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 137 transitions. [2018-11-07 22:06:36,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2018-11-07 22:06:36,823 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:36,824 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:36,824 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:36,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:36,824 INFO L82 PathProgramCache]: Analyzing trace with hash 194297935, now seen corresponding path program 20 times [2018-11-07 22:06:36,824 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:36,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:36,825 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:36,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:36,825 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:36,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:37,145 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 0 proven. 1180 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:37,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:37,145 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:37,146 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:37,146 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:37,146 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:37,146 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:37,155 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:06:37,155 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:06:37,635 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-11-07 22:06:37,635 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:37,639 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:37,665 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 0 proven. 1180 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:37,665 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:38,175 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 0 proven. 1180 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:38,195 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:38,195 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-11-07 22:06:38,196 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:38,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-07 22:06:38,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-07 22:06:38,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 22:06:38,197 INFO L87 Difference]: Start difference. First operand 137 states and 137 transitions. Second operand 24 states. [2018-11-07 22:06:38,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:38,345 INFO L93 Difference]: Finished difference Result 154 states and 154 transitions. [2018-11-07 22:06:38,352 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-07 22:06:38,352 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 136 [2018-11-07 22:06:38,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:38,353 INFO L225 Difference]: With dead ends: 154 [2018-11-07 22:06:38,353 INFO L226 Difference]: Without dead ends: 147 [2018-11-07 22:06:38,354 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 251 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 22:06:38,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-11-07 22:06:38,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 143. [2018-11-07 22:06:38,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2018-11-07 22:06:38,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 143 transitions. [2018-11-07 22:06:38,360 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 143 transitions. Word has length 136 [2018-11-07 22:06:38,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:38,360 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 143 transitions. [2018-11-07 22:06:38,360 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-07 22:06:38,360 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 143 transitions. [2018-11-07 22:06:38,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2018-11-07 22:06:38,361 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:38,361 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:38,362 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:38,362 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:38,362 INFO L82 PathProgramCache]: Analyzing trace with hash 1361276279, now seen corresponding path program 21 times [2018-11-07 22:06:38,362 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:38,363 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:38,363 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:38,363 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:38,363 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:38,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:38,657 INFO L134 CoverageAnalysis]: Checked inductivity of 1302 backedges. 0 proven. 1302 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:38,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:38,657 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:38,658 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:38,658 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:38,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:38,658 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:38,666 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:06:38,666 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:06:39,041 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:06:39,041 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:39,045 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:39,076 INFO L134 CoverageAnalysis]: Checked inductivity of 1302 backedges. 0 proven. 1302 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:39,076 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:39,715 INFO L134 CoverageAnalysis]: Checked inductivity of 1302 backedges. 0 proven. 1302 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:39,735 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:39,735 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2018-11-07 22:06:39,735 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:39,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-07 22:06:39,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-07 22:06:39,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-11-07 22:06:39,738 INFO L87 Difference]: Start difference. First operand 143 states and 143 transitions. Second operand 25 states. [2018-11-07 22:06:39,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:39,884 INFO L93 Difference]: Finished difference Result 160 states and 160 transitions. [2018-11-07 22:06:39,885 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-07 22:06:39,885 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 142 [2018-11-07 22:06:39,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:39,887 INFO L225 Difference]: With dead ends: 160 [2018-11-07 22:06:39,887 INFO L226 Difference]: Without dead ends: 153 [2018-11-07 22:06:39,888 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 262 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-11-07 22:06:39,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2018-11-07 22:06:39,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 149. [2018-11-07 22:06:39,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-11-07 22:06:39,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 149 transitions. [2018-11-07 22:06:39,893 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 149 transitions. Word has length 142 [2018-11-07 22:06:39,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:39,893 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 149 transitions. [2018-11-07 22:06:39,893 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-07 22:06:39,893 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 149 transitions. [2018-11-07 22:06:39,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2018-11-07 22:06:39,894 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:39,894 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:39,895 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:39,895 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:39,895 INFO L82 PathProgramCache]: Analyzing trace with hash -1909089121, now seen corresponding path program 22 times [2018-11-07 22:06:39,895 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:39,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:39,896 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:39,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:39,896 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:39,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:40,329 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 0 proven. 1430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:40,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:40,330 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:40,330 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:40,330 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:40,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:40,330 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:40,338 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:40,338 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:06:40,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:40,379 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:40,421 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 0 proven. 1430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:40,422 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:41,053 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 0 proven. 1430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:41,072 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:41,073 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-11-07 22:06:41,073 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:41,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-07 22:06:41,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-07 22:06:41,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-11-07 22:06:41,074 INFO L87 Difference]: Start difference. First operand 149 states and 149 transitions. Second operand 26 states. [2018-11-07 22:06:41,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:41,285 INFO L93 Difference]: Finished difference Result 166 states and 166 transitions. [2018-11-07 22:06:41,290 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 22:06:41,290 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 148 [2018-11-07 22:06:41,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:41,291 INFO L225 Difference]: With dead ends: 166 [2018-11-07 22:06:41,291 INFO L226 Difference]: Without dead ends: 159 [2018-11-07 22:06:41,292 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 273 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-11-07 22:06:41,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2018-11-07 22:06:41,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 155. [2018-11-07 22:06:41,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2018-11-07 22:06:41,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 155 transitions. [2018-11-07 22:06:41,296 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 155 transitions. Word has length 148 [2018-11-07 22:06:41,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:41,297 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 155 transitions. [2018-11-07 22:06:41,297 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-07 22:06:41,297 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 155 transitions. [2018-11-07 22:06:41,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2018-11-07 22:06:41,298 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:41,298 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:41,298 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:41,298 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:41,298 INFO L82 PathProgramCache]: Analyzing trace with hash -1096692281, now seen corresponding path program 23 times [2018-11-07 22:06:41,299 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:41,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:41,299 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:41,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:41,299 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:41,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:41,636 INFO L134 CoverageAnalysis]: Checked inductivity of 1564 backedges. 0 proven. 1564 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:41,636 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:41,637 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:41,637 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:41,637 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:41,637 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:41,637 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:41,645 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:06:41,645 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:06:42,900 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-11-07 22:06:42,900 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:42,905 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:42,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1564 backedges. 0 proven. 1564 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:42,932 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:43,564 INFO L134 CoverageAnalysis]: Checked inductivity of 1564 backedges. 0 proven. 1564 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:43,584 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:43,585 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-11-07 22:06:43,585 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:43,585 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-11-07 22:06:43,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-11-07 22:06:43,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-11-07 22:06:43,586 INFO L87 Difference]: Start difference. First operand 155 states and 155 transitions. Second operand 27 states. [2018-11-07 22:06:43,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:43,799 INFO L93 Difference]: Finished difference Result 172 states and 172 transitions. [2018-11-07 22:06:43,799 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-07 22:06:43,799 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 154 [2018-11-07 22:06:43,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:43,801 INFO L225 Difference]: With dead ends: 172 [2018-11-07 22:06:43,801 INFO L226 Difference]: Without dead ends: 165 [2018-11-07 22:06:43,802 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 284 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-11-07 22:06:43,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2018-11-07 22:06:43,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 161. [2018-11-07 22:06:43,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2018-11-07 22:06:43,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 161 transitions. [2018-11-07 22:06:43,806 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 161 transitions. Word has length 154 [2018-11-07 22:06:43,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:43,807 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 161 transitions. [2018-11-07 22:06:43,807 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-11-07 22:06:43,807 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 161 transitions. [2018-11-07 22:06:43,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2018-11-07 22:06:43,808 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:43,808 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:43,808 INFO L423 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:43,809 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:43,809 INFO L82 PathProgramCache]: Analyzing trace with hash 1130266863, now seen corresponding path program 24 times [2018-11-07 22:06:43,809 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:43,810 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:43,810 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:43,810 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:43,811 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:43,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:44,243 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 0 proven. 1704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:44,244 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:44,244 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:44,244 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:44,244 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:44,244 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:44,244 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:44,253 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:06:44,253 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:06:44,499 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:06:44,500 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:44,504 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:44,534 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 0 proven. 1704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:44,534 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:45,215 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 0 proven. 1704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:45,236 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:45,236 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 53 [2018-11-07 22:06:45,236 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:45,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-07 22:06:45,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-07 22:06:45,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-11-07 22:06:45,238 INFO L87 Difference]: Start difference. First operand 161 states and 161 transitions. Second operand 28 states. [2018-11-07 22:06:45,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:45,414 INFO L93 Difference]: Finished difference Result 178 states and 178 transitions. [2018-11-07 22:06:45,414 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-11-07 22:06:45,414 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 160 [2018-11-07 22:06:45,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:45,416 INFO L225 Difference]: With dead ends: 178 [2018-11-07 22:06:45,416 INFO L226 Difference]: Without dead ends: 171 [2018-11-07 22:06:45,418 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 295 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-11-07 22:06:45,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2018-11-07 22:06:45,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 167. [2018-11-07 22:06:45,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-11-07 22:06:45,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 167 transitions. [2018-11-07 22:06:45,422 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 167 transitions. Word has length 160 [2018-11-07 22:06:45,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:45,422 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 167 transitions. [2018-11-07 22:06:45,422 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-07 22:06:45,422 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 167 transitions. [2018-11-07 22:06:45,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2018-11-07 22:06:45,423 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:45,423 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:45,424 INFO L423 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:45,424 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:45,424 INFO L82 PathProgramCache]: Analyzing trace with hash -1971177961, now seen corresponding path program 25 times [2018-11-07 22:06:45,424 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:45,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:45,425 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:45,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:45,425 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:45,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:45,837 INFO L134 CoverageAnalysis]: Checked inductivity of 1850 backedges. 0 proven. 1850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:45,838 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:45,838 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:45,838 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:45,838 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:45,838 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:45,838 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:45,846 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:45,846 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:06:45,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:45,901 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:46,033 INFO L134 CoverageAnalysis]: Checked inductivity of 1850 backedges. 0 proven. 1850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:46,033 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:48,181 INFO L134 CoverageAnalysis]: Checked inductivity of 1850 backedges. 0 proven. 1850 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:48,200 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:48,201 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-11-07 22:06:48,201 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:48,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-11-07 22:06:48,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-11-07 22:06:48,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-11-07 22:06:48,203 INFO L87 Difference]: Start difference. First operand 167 states and 167 transitions. Second operand 29 states. [2018-11-07 22:06:48,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:48,359 INFO L93 Difference]: Finished difference Result 184 states and 184 transitions. [2018-11-07 22:06:48,360 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-07 22:06:48,360 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 166 [2018-11-07 22:06:48,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:48,362 INFO L225 Difference]: With dead ends: 184 [2018-11-07 22:06:48,362 INFO L226 Difference]: Without dead ends: 177 [2018-11-07 22:06:48,364 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 306 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-11-07 22:06:48,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-11-07 22:06:48,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 173. [2018-11-07 22:06:48,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2018-11-07 22:06:48,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 173 transitions. [2018-11-07 22:06:48,368 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 173 transitions. Word has length 166 [2018-11-07 22:06:48,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:48,368 INFO L480 AbstractCegarLoop]: Abstraction has 173 states and 173 transitions. [2018-11-07 22:06:48,368 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-11-07 22:06:48,368 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 173 transitions. [2018-11-07 22:06:48,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2018-11-07 22:06:48,369 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:48,370 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:48,370 INFO L423 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:48,370 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:48,370 INFO L82 PathProgramCache]: Analyzing trace with hash -1220317889, now seen corresponding path program 26 times [2018-11-07 22:06:48,370 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:48,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:48,371 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:48,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:48,371 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:48,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:49,380 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 0 proven. 2002 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:49,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:49,380 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:49,380 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:49,380 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:49,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:49,380 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:49,388 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:06:49,388 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:06:50,808 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-11-07 22:06:50,808 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:50,813 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:50,894 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 0 proven. 2002 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:50,895 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:51,899 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 0 proven. 2002 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:51,919 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:51,919 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-11-07 22:06:51,919 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:51,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-11-07 22:06:51,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-11-07 22:06:51,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-11-07 22:06:51,921 INFO L87 Difference]: Start difference. First operand 173 states and 173 transitions. Second operand 30 states. [2018-11-07 22:06:52,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:52,199 INFO L93 Difference]: Finished difference Result 190 states and 190 transitions. [2018-11-07 22:06:52,199 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-07 22:06:52,199 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 172 [2018-11-07 22:06:52,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:52,201 INFO L225 Difference]: With dead ends: 190 [2018-11-07 22:06:52,201 INFO L226 Difference]: Without dead ends: 183 [2018-11-07 22:06:52,203 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 317 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-11-07 22:06:52,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2018-11-07 22:06:52,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 179. [2018-11-07 22:06:52,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2018-11-07 22:06:52,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 179 transitions. [2018-11-07 22:06:52,208 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 179 transitions. Word has length 172 [2018-11-07 22:06:52,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:52,208 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 179 transitions. [2018-11-07 22:06:52,208 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-11-07 22:06:52,208 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 179 transitions. [2018-11-07 22:06:52,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2018-11-07 22:06:52,209 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:52,209 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:52,210 INFO L423 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:52,210 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:52,210 INFO L82 PathProgramCache]: Analyzing trace with hash 1241032295, now seen corresponding path program 27 times [2018-11-07 22:06:52,210 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:52,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:52,211 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:52,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:52,211 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:52,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:54,875 INFO L134 CoverageAnalysis]: Checked inductivity of 2160 backedges. 0 proven. 2160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:54,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:54,876 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:54,876 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:54,876 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:54,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:54,877 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:54,887 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:06:54,887 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:06:55,971 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:06:55,972 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:55,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:56,020 INFO L134 CoverageAnalysis]: Checked inductivity of 2160 backedges. 0 proven. 2160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:56,020 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:57,999 INFO L134 CoverageAnalysis]: Checked inductivity of 2160 backedges. 0 proven. 2160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:58,020 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:58,020 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 59 [2018-11-07 22:06:58,021 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:58,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-11-07 22:06:58,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-11-07 22:06:58,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-11-07 22:06:58,022 INFO L87 Difference]: Start difference. First operand 179 states and 179 transitions. Second operand 31 states. [2018-11-07 22:06:58,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:58,533 INFO L93 Difference]: Finished difference Result 196 states and 196 transitions. [2018-11-07 22:06:58,533 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-11-07 22:06:58,533 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 178 [2018-11-07 22:06:58,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:58,534 INFO L225 Difference]: With dead ends: 196 [2018-11-07 22:06:58,534 INFO L226 Difference]: Without dead ends: 189 [2018-11-07 22:06:58,535 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 385 GetRequests, 328 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-11-07 22:06:58,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2018-11-07 22:06:58,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 185. [2018-11-07 22:06:58,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 185 states. [2018-11-07 22:06:58,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 185 transitions. [2018-11-07 22:06:58,542 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 185 transitions. Word has length 178 [2018-11-07 22:06:58,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:58,542 INFO L480 AbstractCegarLoop]: Abstraction has 185 states and 185 transitions. [2018-11-07 22:06:58,542 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-11-07 22:06:58,543 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 185 transitions. [2018-11-07 22:06:58,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2018-11-07 22:06:58,544 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:58,545 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:58,546 INFO L423 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:58,546 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:58,546 INFO L82 PathProgramCache]: Analyzing trace with hash -937926257, now seen corresponding path program 28 times [2018-11-07 22:06:58,546 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:58,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:58,547 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:58,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:58,547 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:58,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:59,975 INFO L134 CoverageAnalysis]: Checked inductivity of 2324 backedges. 0 proven. 2324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:59,975 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:59,975 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:59,975 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:59,976 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:59,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:59,976 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:59,985 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:59,985 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:07:00,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:07:00,038 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:07:00,108 INFO L134 CoverageAnalysis]: Checked inductivity of 2324 backedges. 0 proven. 2324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:00,109 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:07:01,062 INFO L134 CoverageAnalysis]: Checked inductivity of 2324 backedges. 0 proven. 2324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:01,082 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:07:01,082 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-11-07 22:07:01,082 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:07:01,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-11-07 22:07:01,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-11-07 22:07:01,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-11-07 22:07:01,083 INFO L87 Difference]: Start difference. First operand 185 states and 185 transitions. Second operand 32 states. [2018-11-07 22:07:01,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:07:01,411 INFO L93 Difference]: Finished difference Result 202 states and 202 transitions. [2018-11-07 22:07:01,412 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-07 22:07:01,412 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 184 [2018-11-07 22:07:01,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:07:01,414 INFO L225 Difference]: With dead ends: 202 [2018-11-07 22:07:01,414 INFO L226 Difference]: Without dead ends: 195 [2018-11-07 22:07:01,415 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 339 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-11-07 22:07:01,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2018-11-07 22:07:01,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 191. [2018-11-07 22:07:01,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 191 states. [2018-11-07 22:07:01,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 191 transitions. [2018-11-07 22:07:01,420 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 191 transitions. Word has length 184 [2018-11-07 22:07:01,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:07:01,420 INFO L480 AbstractCegarLoop]: Abstraction has 191 states and 191 transitions. [2018-11-07 22:07:01,420 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-11-07 22:07:01,420 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 191 transitions. [2018-11-07 22:07:01,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2018-11-07 22:07:01,421 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:07:01,422 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:07:01,422 INFO L423 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:07:01,422 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:07:01,422 INFO L82 PathProgramCache]: Analyzing trace with hash 1681465015, now seen corresponding path program 29 times [2018-11-07 22:07:01,422 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:07:01,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:01,423 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:07:01,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:01,423 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:07:01,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:07:02,229 INFO L134 CoverageAnalysis]: Checked inductivity of 2494 backedges. 0 proven. 2494 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:02,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:02,230 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:07:02,230 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:07:02,230 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:07:02,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:02,230 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:07:02,238 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:07:02,238 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:07:05,813 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-11-07 22:07:05,814 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:07:05,820 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:07:05,952 INFO L134 CoverageAnalysis]: Checked inductivity of 2494 backedges. 0 proven. 2494 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:05,952 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:07:07,295 INFO L134 CoverageAnalysis]: Checked inductivity of 2494 backedges. 0 proven. 2494 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:07,316 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:07:07,316 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-11-07 22:07:07,317 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:07:07,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-11-07 22:07:07,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-11-07 22:07:07,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-11-07 22:07:07,318 INFO L87 Difference]: Start difference. First operand 191 states and 191 transitions. Second operand 33 states. [2018-11-07 22:07:07,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:07:07,513 INFO L93 Difference]: Finished difference Result 208 states and 208 transitions. [2018-11-07 22:07:07,513 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-11-07 22:07:07,513 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 190 [2018-11-07 22:07:07,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:07:07,516 INFO L225 Difference]: With dead ends: 208 [2018-11-07 22:07:07,516 INFO L226 Difference]: Without dead ends: 201 [2018-11-07 22:07:07,517 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 350 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-11-07 22:07:07,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2018-11-07 22:07:07,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 197. [2018-11-07 22:07:07,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2018-11-07 22:07:07,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 197 transitions. [2018-11-07 22:07:07,523 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 197 transitions. Word has length 190 [2018-11-07 22:07:07,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:07:07,524 INFO L480 AbstractCegarLoop]: Abstraction has 197 states and 197 transitions. [2018-11-07 22:07:07,524 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-11-07 22:07:07,524 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 197 transitions. [2018-11-07 22:07:07,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2018-11-07 22:07:07,525 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:07:07,525 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:07:07,526 INFO L423 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:07:07,526 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:07:07,526 INFO L82 PathProgramCache]: Analyzing trace with hash -1508811297, now seen corresponding path program 30 times [2018-11-07 22:07:07,526 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:07:07,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:07,527 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:07:07,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:07,527 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:07:07,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:07:08,386 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 0 proven. 2670 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:08,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:08,387 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:07:08,387 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:07:08,387 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:07:08,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:08,387 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:07:08,396 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:07:08,396 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:07:08,565 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:07:08,566 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:07:08,572 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:07:08,633 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 0 proven. 2670 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:08,633 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:07:09,693 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 0 proven. 2670 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:09,714 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:07:09,714 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 65 [2018-11-07 22:07:09,714 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:07:09,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-07 22:07:09,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-07 22:07:09,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-11-07 22:07:09,715 INFO L87 Difference]: Start difference. First operand 197 states and 197 transitions. Second operand 34 states. [2018-11-07 22:07:09,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:07:09,939 INFO L93 Difference]: Finished difference Result 214 states and 214 transitions. [2018-11-07 22:07:09,940 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-11-07 22:07:09,940 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 196 [2018-11-07 22:07:09,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:07:09,942 INFO L225 Difference]: With dead ends: 214 [2018-11-07 22:07:09,942 INFO L226 Difference]: Without dead ends: 207 [2018-11-07 22:07:09,943 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 361 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-11-07 22:07:09,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-11-07 22:07:09,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 203. [2018-11-07 22:07:09,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 203 states. [2018-11-07 22:07:09,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 203 transitions. [2018-11-07 22:07:09,948 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 203 transitions. Word has length 196 [2018-11-07 22:07:09,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:07:09,949 INFO L480 AbstractCegarLoop]: Abstraction has 203 states and 203 transitions. [2018-11-07 22:07:09,949 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-07 22:07:09,949 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 203 transitions. [2018-11-07 22:07:09,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2018-11-07 22:07:09,950 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:07:09,950 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:07:09,950 INFO L423 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:07:09,950 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:07:09,951 INFO L82 PathProgramCache]: Analyzing trace with hash 309829383, now seen corresponding path program 31 times [2018-11-07 22:07:09,951 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:07:09,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:09,952 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:07:09,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:09,952 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:07:09,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:07:10,563 INFO L134 CoverageAnalysis]: Checked inductivity of 2852 backedges. 0 proven. 2852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:10,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:10,563 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:07:10,563 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:07:10,564 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:07:10,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:10,564 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:07:10,573 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:07:10,573 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:07:10,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:07:10,629 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:07:10,681 INFO L134 CoverageAnalysis]: Checked inductivity of 2852 backedges. 0 proven. 2852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:10,682 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:07:11,903 INFO L134 CoverageAnalysis]: Checked inductivity of 2852 backedges. 0 proven. 2852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:11,922 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:07:11,922 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2018-11-07 22:07:11,922 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:07:11,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-11-07 22:07:11,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-11-07 22:07:11,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-11-07 22:07:11,924 INFO L87 Difference]: Start difference. First operand 203 states and 203 transitions. Second operand 35 states. [2018-11-07 22:07:12,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:07:12,458 INFO L93 Difference]: Finished difference Result 220 states and 220 transitions. [2018-11-07 22:07:12,459 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-07 22:07:12,459 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 202 [2018-11-07 22:07:12,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:07:12,460 INFO L225 Difference]: With dead ends: 220 [2018-11-07 22:07:12,460 INFO L226 Difference]: Without dead ends: 213 [2018-11-07 22:07:12,461 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 372 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-11-07 22:07:12,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2018-11-07 22:07:12,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 209. [2018-11-07 22:07:12,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2018-11-07 22:07:12,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 209 transitions. [2018-11-07 22:07:12,466 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 209 transitions. Word has length 202 [2018-11-07 22:07:12,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:07:12,466 INFO L480 AbstractCegarLoop]: Abstraction has 209 states and 209 transitions. [2018-11-07 22:07:12,466 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-11-07 22:07:12,466 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 209 transitions. [2018-11-07 22:07:12,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2018-11-07 22:07:12,468 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:07:12,468 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:07:12,468 INFO L423 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:07:12,468 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:07:12,468 INFO L82 PathProgramCache]: Analyzing trace with hash -748527057, now seen corresponding path program 32 times [2018-11-07 22:07:12,468 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:07:12,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:12,469 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:07:12,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:12,470 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:07:12,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:07:14,119 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 0 proven. 3040 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:14,119 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:14,119 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:07:14,119 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:07:14,119 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:07:14,120 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:14,120 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:07:14,127 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:07:14,128 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:07:16,843 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-11-07 22:07:16,844 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:07:16,850 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:07:16,897 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 0 proven. 3040 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:16,897 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:07:18,134 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 0 proven. 3040 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:18,155 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:07:18,155 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-11-07 22:07:18,156 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:07:18,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-07 22:07:18,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-07 22:07:18,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-11-07 22:07:18,157 INFO L87 Difference]: Start difference. First operand 209 states and 209 transitions. Second operand 36 states. [2018-11-07 22:07:18,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:07:18,452 INFO L93 Difference]: Finished difference Result 226 states and 226 transitions. [2018-11-07 22:07:18,453 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-07 22:07:18,453 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 208 [2018-11-07 22:07:18,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:07:18,454 INFO L225 Difference]: With dead ends: 226 [2018-11-07 22:07:18,454 INFO L226 Difference]: Without dead ends: 219 [2018-11-07 22:07:18,455 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 383 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-11-07 22:07:18,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-11-07 22:07:18,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 215. [2018-11-07 22:07:18,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2018-11-07 22:07:18,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 215 transitions. [2018-11-07 22:07:18,460 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 215 transitions. Word has length 208 [2018-11-07 22:07:18,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:07:18,460 INFO L480 AbstractCegarLoop]: Abstraction has 215 states and 215 transitions. [2018-11-07 22:07:18,460 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-07 22:07:18,460 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 215 transitions. [2018-11-07 22:07:18,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2018-11-07 22:07:18,461 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:07:18,461 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:07:18,462 INFO L423 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:07:18,462 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:07:18,462 INFO L82 PathProgramCache]: Analyzing trace with hash 1609049943, now seen corresponding path program 33 times [2018-11-07 22:07:18,462 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:07:18,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:18,463 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:07:18,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:18,463 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:07:18,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:07:19,061 INFO L134 CoverageAnalysis]: Checked inductivity of 3234 backedges. 0 proven. 3234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:19,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:19,062 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:07:19,062 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:07:19,062 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:07:19,062 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:19,062 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:07:19,070 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:07:19,070 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:07:20,934 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:07:20,934 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:07:20,941 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:07:20,985 INFO L134 CoverageAnalysis]: Checked inductivity of 3234 backedges. 0 proven. 3234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:20,985 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:07:22,380 INFO L134 CoverageAnalysis]: Checked inductivity of 3234 backedges. 0 proven. 3234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:22,402 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:07:22,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2018-11-07 22:07:22,403 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:07:22,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-11-07 22:07:22,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-11-07 22:07:22,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2485, Invalid=2485, Unknown=0, NotChecked=0, Total=4970 [2018-11-07 22:07:22,404 INFO L87 Difference]: Start difference. First operand 215 states and 215 transitions. Second operand 37 states. [2018-11-07 22:07:22,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:07:22,600 INFO L93 Difference]: Finished difference Result 232 states and 232 transitions. [2018-11-07 22:07:22,601 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-11-07 22:07:22,601 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 214 [2018-11-07 22:07:22,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:07:22,602 INFO L225 Difference]: With dead ends: 232 [2018-11-07 22:07:22,603 INFO L226 Difference]: Without dead ends: 225 [2018-11-07 22:07:22,603 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 463 GetRequests, 394 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2485, Invalid=2485, Unknown=0, NotChecked=0, Total=4970 [2018-11-07 22:07:22,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2018-11-07 22:07:22,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 221. [2018-11-07 22:07:22,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 221 states. [2018-11-07 22:07:22,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 221 transitions. [2018-11-07 22:07:22,608 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 221 transitions. Word has length 214 [2018-11-07 22:07:22,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:07:22,609 INFO L480 AbstractCegarLoop]: Abstraction has 221 states and 221 transitions. [2018-11-07 22:07:22,609 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-11-07 22:07:22,609 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 221 transitions. [2018-11-07 22:07:22,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2018-11-07 22:07:22,610 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:07:22,610 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:07:22,611 INFO L423 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:07:22,611 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:07:22,611 INFO L82 PathProgramCache]: Analyzing trace with hash 608136831, now seen corresponding path program 34 times [2018-11-07 22:07:22,611 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:07:22,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:22,612 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:07:22,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:22,612 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:07:22,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:07:23,323 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 0 proven. 3434 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:23,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:23,323 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:07:23,323 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:07:23,323 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:07:23,324 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:23,324 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:07:23,331 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:07:23,331 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:07:23,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:07:23,388 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:07:23,433 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 0 proven. 3434 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:23,433 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:07:24,839 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 0 proven. 3434 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:24,859 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:07:24,859 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-11-07 22:07:24,859 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:07:24,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-11-07 22:07:24,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-11-07 22:07:24,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-11-07 22:07:24,861 INFO L87 Difference]: Start difference. First operand 221 states and 221 transitions. Second operand 38 states. [2018-11-07 22:07:25,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:07:25,087 INFO L93 Difference]: Finished difference Result 238 states and 238 transitions. [2018-11-07 22:07:25,087 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-11-07 22:07:25,087 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 220 [2018-11-07 22:07:25,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:07:25,088 INFO L225 Difference]: With dead ends: 238 [2018-11-07 22:07:25,088 INFO L226 Difference]: Without dead ends: 231 [2018-11-07 22:07:25,089 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 405 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-11-07 22:07:25,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2018-11-07 22:07:25,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 227. [2018-11-07 22:07:25,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 227 states. [2018-11-07 22:07:25,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 227 transitions. [2018-11-07 22:07:25,095 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 227 transitions. Word has length 220 [2018-11-07 22:07:25,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:07:25,095 INFO L480 AbstractCegarLoop]: Abstraction has 227 states and 227 transitions. [2018-11-07 22:07:25,095 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-11-07 22:07:25,095 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 227 transitions. [2018-11-07 22:07:25,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2018-11-07 22:07:25,097 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:07:25,097 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:07:25,097 INFO L423 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:07:25,097 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:07:25,098 INFO L82 PathProgramCache]: Analyzing trace with hash 700364711, now seen corresponding path program 35 times [2018-11-07 22:07:25,098 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:07:25,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:25,098 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:07:25,099 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:25,099 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:07:25,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:07:25,749 INFO L134 CoverageAnalysis]: Checked inductivity of 3640 backedges. 0 proven. 3640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:25,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:25,750 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:07:25,750 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:07:25,750 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:07:25,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:25,750 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:07:25,759 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:07:25,759 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:07:34,923 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-11-07 22:07:34,923 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:07:34,932 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:07:35,029 INFO L134 CoverageAnalysis]: Checked inductivity of 3640 backedges. 0 proven. 3640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:35,029 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:07:36,582 INFO L134 CoverageAnalysis]: Checked inductivity of 3640 backedges. 0 proven. 3640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:36,605 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:07:36,605 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2018-11-07 22:07:36,605 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:07:36,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-11-07 22:07:36,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-11-07 22:07:36,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-11-07 22:07:36,607 INFO L87 Difference]: Start difference. First operand 227 states and 227 transitions. Second operand 39 states. [2018-11-07 22:07:36,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:07:36,812 INFO L93 Difference]: Finished difference Result 244 states and 244 transitions. [2018-11-07 22:07:36,814 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-11-07 22:07:36,814 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 226 [2018-11-07 22:07:36,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:07:36,815 INFO L225 Difference]: With dead ends: 244 [2018-11-07 22:07:36,816 INFO L226 Difference]: Without dead ends: 237 [2018-11-07 22:07:36,816 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 416 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-11-07 22:07:36,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2018-11-07 22:07:36,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 233. [2018-11-07 22:07:36,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2018-11-07 22:07:36,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 233 transitions. [2018-11-07 22:07:36,821 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 233 transitions. Word has length 226 [2018-11-07 22:07:36,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:07:36,821 INFO L480 AbstractCegarLoop]: Abstraction has 233 states and 233 transitions. [2018-11-07 22:07:36,821 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-11-07 22:07:36,821 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 233 transitions. [2018-11-07 22:07:36,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 233 [2018-11-07 22:07:36,822 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:07:36,823 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:07:36,823 INFO L423 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:07:36,823 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:07:36,823 INFO L82 PathProgramCache]: Analyzing trace with hash -1092844849, now seen corresponding path program 36 times [2018-11-07 22:07:36,823 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:07:36,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:36,824 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:07:36,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:36,824 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:07:36,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:07:37,467 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 0 proven. 3852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:37,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:37,468 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:07:37,468 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:07:37,468 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:07:37,468 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:37,468 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:07:37,477 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:07:37,477 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:07:38,881 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:07:38,881 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:07:38,889 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:07:38,997 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 0 proven. 3852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:38,997 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:07:41,145 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 0 proven. 3852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:41,168 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:07:41,168 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 77 [2018-11-07 22:07:41,168 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:07:41,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-07 22:07:41,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-07 22:07:41,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2926, Invalid=2926, Unknown=0, NotChecked=0, Total=5852 [2018-11-07 22:07:41,170 INFO L87 Difference]: Start difference. First operand 233 states and 233 transitions. Second operand 40 states. [2018-11-07 22:07:41,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:07:41,389 INFO L93 Difference]: Finished difference Result 250 states and 250 transitions. [2018-11-07 22:07:41,389 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-11-07 22:07:41,390 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 232 [2018-11-07 22:07:41,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:07:41,391 INFO L225 Difference]: With dead ends: 250 [2018-11-07 22:07:41,391 INFO L226 Difference]: Without dead ends: 243 [2018-11-07 22:07:41,392 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 427 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2926, Invalid=2926, Unknown=0, NotChecked=0, Total=5852 [2018-11-07 22:07:41,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2018-11-07 22:07:41,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 239. [2018-11-07 22:07:41,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2018-11-07 22:07:41,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 239 transitions. [2018-11-07 22:07:41,397 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 239 transitions. Word has length 232 [2018-11-07 22:07:41,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:07:41,398 INFO L480 AbstractCegarLoop]: Abstraction has 239 states and 239 transitions. [2018-11-07 22:07:41,398 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-07 22:07:41,398 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 239 transitions. [2018-11-07 22:07:41,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2018-11-07 22:07:41,399 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:07:41,399 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:07:41,400 INFO L423 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:07:41,400 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:07:41,400 INFO L82 PathProgramCache]: Analyzing trace with hash 523194359, now seen corresponding path program 37 times [2018-11-07 22:07:41,400 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:07:41,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:41,401 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:07:41,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:41,401 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:07:41,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:07:42,210 INFO L134 CoverageAnalysis]: Checked inductivity of 4070 backedges. 0 proven. 4070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:42,210 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:42,210 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:07:42,211 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:07:42,211 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:07:42,211 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:42,211 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:07:42,219 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:07:42,219 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:07:42,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:07:42,283 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:07:42,444 INFO L134 CoverageAnalysis]: Checked inductivity of 4070 backedges. 0 proven. 4070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:42,444 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:07:44,342 INFO L134 CoverageAnalysis]: Checked inductivity of 4070 backedges. 0 proven. 4070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:44,362 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:07:44,362 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2018-11-07 22:07:44,362 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:07:44,363 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-11-07 22:07:44,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-11-07 22:07:44,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-11-07 22:07:44,364 INFO L87 Difference]: Start difference. First operand 239 states and 239 transitions. Second operand 41 states. [2018-11-07 22:07:44,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:07:44,590 INFO L93 Difference]: Finished difference Result 256 states and 256 transitions. [2018-11-07 22:07:44,598 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-11-07 22:07:44,598 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 238 [2018-11-07 22:07:44,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:07:44,599 INFO L225 Difference]: With dead ends: 256 [2018-11-07 22:07:44,600 INFO L226 Difference]: Without dead ends: 249 [2018-11-07 22:07:44,600 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 515 GetRequests, 438 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-11-07 22:07:44,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2018-11-07 22:07:44,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 245. [2018-11-07 22:07:44,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245 states. [2018-11-07 22:07:44,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 245 transitions. [2018-11-07 22:07:44,605 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 245 transitions. Word has length 238 [2018-11-07 22:07:44,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:07:44,606 INFO L480 AbstractCegarLoop]: Abstraction has 245 states and 245 transitions. [2018-11-07 22:07:44,606 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-11-07 22:07:44,606 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 245 transitions. [2018-11-07 22:07:44,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2018-11-07 22:07:44,607 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:07:44,607 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:07:44,608 INFO L423 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:07:44,608 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:07:44,608 INFO L82 PathProgramCache]: Analyzing trace with hash 460168991, now seen corresponding path program 38 times [2018-11-07 22:07:44,608 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:07:44,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:44,609 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:07:44,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:44,609 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:07:44,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:07:45,364 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 0 proven. 4294 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:45,364 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:45,364 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:07:45,364 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:07:45,364 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:07:45,364 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:45,364 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:07:45,372 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:07:45,372 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:08:05,513 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-11-07 22:08:05,513 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:08:05,525 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:08:05,614 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 0 proven. 4294 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:05,615 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:08:07,254 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 0 proven. 4294 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:07,278 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:08:07,278 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-11-07 22:08:07,278 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:08:07,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-11-07 22:08:07,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-11-07 22:08:07,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2018-11-07 22:08:07,280 INFO L87 Difference]: Start difference. First operand 245 states and 245 transitions. Second operand 42 states. [2018-11-07 22:08:07,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:08:07,540 INFO L93 Difference]: Finished difference Result 262 states and 262 transitions. [2018-11-07 22:08:07,540 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-11-07 22:08:07,540 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 244 [2018-11-07 22:08:07,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:08:07,541 INFO L225 Difference]: With dead ends: 262 [2018-11-07 22:08:07,541 INFO L226 Difference]: Without dead ends: 255 [2018-11-07 22:08:07,542 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 449 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2018-11-07 22:08:07,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2018-11-07 22:08:07,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 251. [2018-11-07 22:08:07,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 251 states. [2018-11-07 22:08:07,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 251 transitions. [2018-11-07 22:08:07,548 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 251 transitions. Word has length 244 [2018-11-07 22:08:07,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:08:07,548 INFO L480 AbstractCegarLoop]: Abstraction has 251 states and 251 transitions. [2018-11-07 22:08:07,548 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-11-07 22:08:07,548 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 251 transitions. [2018-11-07 22:08:07,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2018-11-07 22:08:07,550 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:08:07,550 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:08:07,550 INFO L423 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:08:07,550 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:08:07,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1049759673, now seen corresponding path program 39 times [2018-11-07 22:08:07,551 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:08:07,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:07,551 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:08:07,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:07,551 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:08:07,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:08:08,355 INFO L134 CoverageAnalysis]: Checked inductivity of 4524 backedges. 0 proven. 4524 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:08,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:08,355 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:08:08,355 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:08:08,356 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:08:08,356 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:08,356 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:08:08,364 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:08:08,364 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:08:08,742 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:08:08,742 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:08:08,750 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:08:08,867 INFO L134 CoverageAnalysis]: Checked inductivity of 4524 backedges. 0 proven. 4524 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:08,867 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:08:10,814 INFO L134 CoverageAnalysis]: Checked inductivity of 4524 backedges. 0 proven. 4524 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:10,838 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:08:10,838 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 83 [2018-11-07 22:08:10,838 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:08:10,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-11-07 22:08:10,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-11-07 22:08:10,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3403, Invalid=3403, Unknown=0, NotChecked=0, Total=6806 [2018-11-07 22:08:10,839 INFO L87 Difference]: Start difference. First operand 251 states and 251 transitions. Second operand 43 states. [2018-11-07 22:08:11,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:08:11,113 INFO L93 Difference]: Finished difference Result 268 states and 268 transitions. [2018-11-07 22:08:11,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-11-07 22:08:11,114 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 250 [2018-11-07 22:08:11,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:08:11,116 INFO L225 Difference]: With dead ends: 268 [2018-11-07 22:08:11,116 INFO L226 Difference]: Without dead ends: 261 [2018-11-07 22:08:11,117 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 460 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3403, Invalid=3403, Unknown=0, NotChecked=0, Total=6806 [2018-11-07 22:08:11,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2018-11-07 22:08:11,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 257. [2018-11-07 22:08:11,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 257 states. [2018-11-07 22:08:11,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 257 transitions. [2018-11-07 22:08:11,121 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 257 transitions. Word has length 250 [2018-11-07 22:08:11,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:08:11,122 INFO L480 AbstractCegarLoop]: Abstraction has 257 states and 257 transitions. [2018-11-07 22:08:11,122 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-11-07 22:08:11,122 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 257 transitions. [2018-11-07 22:08:11,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2018-11-07 22:08:11,123 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:08:11,123 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:08:11,124 INFO L423 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:08:11,124 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:08:11,124 INFO L82 PathProgramCache]: Analyzing trace with hash 69649263, now seen corresponding path program 40 times [2018-11-07 22:08:11,124 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:08:11,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:11,125 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:08:11,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:11,125 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:08:11,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:08:12,007 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 0 proven. 4760 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:12,008 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:12,008 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:08:12,008 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:08:12,008 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:08:12,008 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:12,008 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:08:12,016 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:08:12,016 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:08:12,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:08:12,083 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:08:12,160 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 0 proven. 4760 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:12,161 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:08:14,035 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 0 proven. 4760 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:14,054 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:08:14,054 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2018-11-07 22:08:14,054 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:08:14,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-11-07 22:08:14,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-11-07 22:08:14,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3570, Invalid=3570, Unknown=0, NotChecked=0, Total=7140 [2018-11-07 22:08:14,055 INFO L87 Difference]: Start difference. First operand 257 states and 257 transitions. Second operand 44 states. [2018-11-07 22:08:14,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:08:14,338 INFO L93 Difference]: Finished difference Result 274 states and 274 transitions. [2018-11-07 22:08:14,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-07 22:08:14,338 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 256 [2018-11-07 22:08:14,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:08:14,340 INFO L225 Difference]: With dead ends: 274 [2018-11-07 22:08:14,340 INFO L226 Difference]: Without dead ends: 267 [2018-11-07 22:08:14,341 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 554 GetRequests, 471 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3570, Invalid=3570, Unknown=0, NotChecked=0, Total=7140 [2018-11-07 22:08:14,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2018-11-07 22:08:14,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 263. [2018-11-07 22:08:14,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 263 states. [2018-11-07 22:08:14,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 263 transitions. [2018-11-07 22:08:14,346 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 263 transitions. Word has length 256 [2018-11-07 22:08:14,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:08:14,346 INFO L480 AbstractCegarLoop]: Abstraction has 263 states and 263 transitions. [2018-11-07 22:08:14,346 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-11-07 22:08:14,346 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 263 transitions. [2018-11-07 22:08:14,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2018-11-07 22:08:14,347 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:08:14,348 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:08:14,348 INFO L423 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:08:14,348 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:08:14,348 INFO L82 PathProgramCache]: Analyzing trace with hash 1672386711, now seen corresponding path program 41 times [2018-11-07 22:08:14,348 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:08:14,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:14,349 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:08:14,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:14,349 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:08:14,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:08:15,165 INFO L134 CoverageAnalysis]: Checked inductivity of 5002 backedges. 0 proven. 5002 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:15,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:15,166 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:08:15,166 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:08:15,166 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:08:15,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:15,166 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:08:15,174 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:08:15,174 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:08:46,548 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-11-07 22:08:46,548 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:08:46,564 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:08:46,657 INFO L134 CoverageAnalysis]: Checked inductivity of 5002 backedges. 0 proven. 5002 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:46,657 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:08:48,530 INFO L134 CoverageAnalysis]: Checked inductivity of 5002 backedges. 0 proven. 5002 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:48,555 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:08:48,555 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2018-11-07 22:08:48,556 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:08:48,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-11-07 22:08:48,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-11-07 22:08:48,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3741, Invalid=3741, Unknown=0, NotChecked=0, Total=7482 [2018-11-07 22:08:48,557 INFO L87 Difference]: Start difference. First operand 263 states and 263 transitions. Second operand 45 states. [2018-11-07 22:08:48,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:08:48,840 INFO L93 Difference]: Finished difference Result 280 states and 280 transitions. [2018-11-07 22:08:48,842 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-11-07 22:08:48,842 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 262 [2018-11-07 22:08:48,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:08:48,844 INFO L225 Difference]: With dead ends: 280 [2018-11-07 22:08:48,844 INFO L226 Difference]: Without dead ends: 273 [2018-11-07 22:08:48,844 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 567 GetRequests, 482 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=3741, Invalid=3741, Unknown=0, NotChecked=0, Total=7482 [2018-11-07 22:08:48,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2018-11-07 22:08:48,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 269. [2018-11-07 22:08:48,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2018-11-07 22:08:48,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 269 transitions. [2018-11-07 22:08:48,849 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 269 transitions. Word has length 262 [2018-11-07 22:08:48,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:08:48,849 INFO L480 AbstractCegarLoop]: Abstraction has 269 states and 269 transitions. [2018-11-07 22:08:48,849 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-11-07 22:08:48,850 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 269 transitions. [2018-11-07 22:08:48,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2018-11-07 22:08:48,851 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:08:48,851 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:08:48,852 INFO L423 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:08:48,852 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:08:48,852 INFO L82 PathProgramCache]: Analyzing trace with hash -1791234113, now seen corresponding path program 42 times [2018-11-07 22:08:48,852 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:08:48,853 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:48,853 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:08:48,853 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:48,853 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:08:48,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:08:49,699 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 0 proven. 5250 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:49,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:49,699 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:08:49,699 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:08:49,699 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:08:49,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:49,700 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:08:49,708 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:08:49,708 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:08:55,097 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:08:55,098 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:08:55,107 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:08:55,177 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 0 proven. 5250 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:55,178 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:08:57,321 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 0 proven. 5250 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:57,345 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:08:57,345 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 89 [2018-11-07 22:08:57,345 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:08:57,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-11-07 22:08:57,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-11-07 22:08:57,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3916, Invalid=3916, Unknown=0, NotChecked=0, Total=7832 [2018-11-07 22:08:57,347 INFO L87 Difference]: Start difference. First operand 269 states and 269 transitions. Second operand 46 states. [2018-11-07 22:08:57,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:08:57,608 INFO L93 Difference]: Finished difference Result 286 states and 286 transitions. [2018-11-07 22:08:57,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-11-07 22:08:57,608 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 268 [2018-11-07 22:08:57,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:08:57,609 INFO L225 Difference]: With dead ends: 286 [2018-11-07 22:08:57,609 INFO L226 Difference]: Without dead ends: 279 [2018-11-07 22:08:57,610 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 580 GetRequests, 493 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3916, Invalid=3916, Unknown=0, NotChecked=0, Total=7832 [2018-11-07 22:08:57,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2018-11-07 22:08:57,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 275. [2018-11-07 22:08:57,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 275 states. [2018-11-07 22:08:57,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 275 transitions. [2018-11-07 22:08:57,615 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 275 transitions. Word has length 268 [2018-11-07 22:08:57,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:08:57,616 INFO L480 AbstractCegarLoop]: Abstraction has 275 states and 275 transitions. [2018-11-07 22:08:57,616 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-11-07 22:08:57,616 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 275 transitions. [2018-11-07 22:08:57,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2018-11-07 22:08:57,617 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:08:57,618 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:08:57,618 INFO L423 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:08:57,618 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:08:57,618 INFO L82 PathProgramCache]: Analyzing trace with hash 723863783, now seen corresponding path program 43 times [2018-11-07 22:08:57,618 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:08:57,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:57,619 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:08:57,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:57,619 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:08:57,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:08:58,502 INFO L134 CoverageAnalysis]: Checked inductivity of 5504 backedges. 0 proven. 5504 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:58,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:58,502 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:08:58,502 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:08:58,502 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:08:58,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:58,502 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:08:58,512 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:08:58,513 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:08:58,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:08:58,586 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:08:58,652 INFO L134 CoverageAnalysis]: Checked inductivity of 5504 backedges. 0 proven. 5504 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:58,653 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:09:00,915 INFO L134 CoverageAnalysis]: Checked inductivity of 5504 backedges. 0 proven. 5504 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:09:00,936 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:09:00,936 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 91 [2018-11-07 22:09:00,936 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:09:00,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-11-07 22:09:00,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-11-07 22:09:00,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4095, Invalid=4095, Unknown=0, NotChecked=0, Total=8190 [2018-11-07 22:09:00,938 INFO L87 Difference]: Start difference. First operand 275 states and 275 transitions. Second operand 47 states. [2018-11-07 22:09:01,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:09:01,216 INFO L93 Difference]: Finished difference Result 292 states and 292 transitions. [2018-11-07 22:09:01,216 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-11-07 22:09:01,216 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 274 [2018-11-07 22:09:01,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:09:01,218 INFO L225 Difference]: With dead ends: 292 [2018-11-07 22:09:01,218 INFO L226 Difference]: Without dead ends: 285 [2018-11-07 22:09:01,219 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 593 GetRequests, 504 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=4095, Invalid=4095, Unknown=0, NotChecked=0, Total=8190 [2018-11-07 22:09:01,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2018-11-07 22:09:01,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 281. [2018-11-07 22:09:01,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 281 states. [2018-11-07 22:09:01,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 281 transitions. [2018-11-07 22:09:01,240 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 281 transitions. Word has length 274 [2018-11-07 22:09:01,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:09:01,241 INFO L480 AbstractCegarLoop]: Abstraction has 281 states and 281 transitions. [2018-11-07 22:09:01,241 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-11-07 22:09:01,241 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 281 transitions. [2018-11-07 22:09:01,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 281 [2018-11-07 22:09:01,242 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:09:01,243 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:09:01,243 INFO L423 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:09:01,243 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:09:01,243 INFO L82 PathProgramCache]: Analyzing trace with hash 1021387791, now seen corresponding path program 44 times [2018-11-07 22:09:01,243 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:09:01,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:09:01,244 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:09:01,245 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:09:01,245 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:09:01,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:09:02,169 INFO L134 CoverageAnalysis]: Checked inductivity of 5764 backedges. 0 proven. 5764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:09:02,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:09:02,170 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:09:02,170 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:09:02,170 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:09:02,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:09:02,170 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:09:02,181 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:09:02,182 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:09:40,494 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-11-07 22:09:40,494 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:09:40,507 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:09:40,588 INFO L134 CoverageAnalysis]: Checked inductivity of 5764 backedges. 0 proven. 5764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:09:40,588 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:09:42,786 INFO L134 CoverageAnalysis]: Checked inductivity of 5764 backedges. 0 proven. 5764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:09:42,812 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:09:42,812 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-11-07 22:09:42,812 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:09:42,813 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-11-07 22:09:42,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-11-07 22:09:42,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2018-11-07 22:09:42,813 INFO L87 Difference]: Start difference. First operand 281 states and 281 transitions. Second operand 48 states. [2018-11-07 22:09:43,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:09:43,136 INFO L93 Difference]: Finished difference Result 298 states and 298 transitions. [2018-11-07 22:09:43,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-11-07 22:09:43,137 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 280 [2018-11-07 22:09:43,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:09:43,139 INFO L225 Difference]: With dead ends: 298 [2018-11-07 22:09:43,139 INFO L226 Difference]: Without dead ends: 291 [2018-11-07 22:09:43,139 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 606 GetRequests, 515 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2018-11-07 22:09:43,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2018-11-07 22:09:43,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 287. [2018-11-07 22:09:43,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2018-11-07 22:09:43,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 287 transitions. [2018-11-07 22:09:43,144 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 287 transitions. Word has length 280 [2018-11-07 22:09:43,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:09:43,144 INFO L480 AbstractCegarLoop]: Abstraction has 287 states and 287 transitions. [2018-11-07 22:09:43,144 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-11-07 22:09:43,144 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 287 transitions. [2018-11-07 22:09:43,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2018-11-07 22:09:43,146 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:09:43,146 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:09:43,146 INFO L423 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:09:43,146 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:09:43,146 INFO L82 PathProgramCache]: Analyzing trace with hash 252051767, now seen corresponding path program 45 times [2018-11-07 22:09:43,147 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:09:43,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:09:43,147 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:09:43,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:09:43,148 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:09:43,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:09:44,520 INFO L134 CoverageAnalysis]: Checked inductivity of 6030 backedges. 0 proven. 6030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:09:44,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:09:44,521 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:09:44,521 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:09:44,521 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:09:44,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:09:44,521 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:09:44,531 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:09:44,531 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:09:44,882 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:09:44,882 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:09:44,890 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:09:44,953 INFO L134 CoverageAnalysis]: Checked inductivity of 6030 backedges. 0 proven. 6030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:09:44,953 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:09:47,226 INFO L134 CoverageAnalysis]: Checked inductivity of 6030 backedges. 0 proven. 6030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:09:47,249 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:09:47,249 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2018-11-07 22:09:47,249 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:09:47,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-11-07 22:09:47,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-11-07 22:09:47,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4465, Invalid=4465, Unknown=0, NotChecked=0, Total=8930 [2018-11-07 22:09:47,251 INFO L87 Difference]: Start difference. First operand 287 states and 287 transitions. Second operand 49 states. [2018-11-07 22:09:47,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:09:47,980 INFO L93 Difference]: Finished difference Result 304 states and 304 transitions. [2018-11-07 22:09:47,980 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-11-07 22:09:47,981 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 286 [2018-11-07 22:09:47,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:09:47,982 INFO L225 Difference]: With dead ends: 304 [2018-11-07 22:09:47,982 INFO L226 Difference]: Without dead ends: 297 [2018-11-07 22:09:47,983 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 619 GetRequests, 526 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4465, Invalid=4465, Unknown=0, NotChecked=0, Total=8930 [2018-11-07 22:09:47,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2018-11-07 22:09:47,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 293. [2018-11-07 22:09:47,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 293 states. [2018-11-07 22:09:47,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 293 transitions. [2018-11-07 22:09:47,990 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 293 transitions. Word has length 286 [2018-11-07 22:09:47,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:09:47,991 INFO L480 AbstractCegarLoop]: Abstraction has 293 states and 293 transitions. [2018-11-07 22:09:47,991 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-11-07 22:09:47,991 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 293 transitions. [2018-11-07 22:09:47,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2018-11-07 22:09:47,993 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:09:47,993 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:09:47,993 INFO L423 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:09:47,993 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:09:47,993 INFO L82 PathProgramCache]: Analyzing trace with hash -1152753569, now seen corresponding path program 46 times [2018-11-07 22:09:47,994 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:09:47,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:09:47,994 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:09:47,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:09:47,995 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:09:48,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:09:50,602 INFO L134 CoverageAnalysis]: Checked inductivity of 6302 backedges. 0 proven. 6302 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:09:50,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:09:50,602 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:09:50,603 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:09:50,603 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:09:50,603 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:09:50,603 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:09:50,612 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:09:50,612 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:09:50,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:09:50,689 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:09:50,764 INFO L134 CoverageAnalysis]: Checked inductivity of 6302 backedges. 0 proven. 6302 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:09:50,764 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:09:53,301 INFO L134 CoverageAnalysis]: Checked inductivity of 6302 backedges. 0 proven. 6302 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:09:53,321 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:09:53,321 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2018-11-07 22:09:53,321 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:09:53,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-11-07 22:09:53,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-11-07 22:09:53,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4656, Invalid=4656, Unknown=0, NotChecked=0, Total=9312 [2018-11-07 22:09:53,323 INFO L87 Difference]: Start difference. First operand 293 states and 293 transitions. Second operand 50 states. [2018-11-07 22:09:53,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:09:53,625 INFO L93 Difference]: Finished difference Result 310 states and 310 transitions. [2018-11-07 22:09:53,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-11-07 22:09:53,625 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 292 [2018-11-07 22:09:53,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:09:53,627 INFO L225 Difference]: With dead ends: 310 [2018-11-07 22:09:53,627 INFO L226 Difference]: Without dead ends: 303 [2018-11-07 22:09:53,628 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 537 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=4656, Invalid=4656, Unknown=0, NotChecked=0, Total=9312 [2018-11-07 22:09:53,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2018-11-07 22:09:53,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 299. [2018-11-07 22:09:53,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 299 states. [2018-11-07 22:09:53,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 299 transitions. [2018-11-07 22:09:53,633 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 299 transitions. Word has length 292 [2018-11-07 22:09:53,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:09:53,634 INFO L480 AbstractCegarLoop]: Abstraction has 299 states and 299 transitions. [2018-11-07 22:09:53,634 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-11-07 22:09:53,634 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 299 transitions. [2018-11-07 22:09:53,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2018-11-07 22:09:53,635 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:09:53,636 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:09:53,636 INFO L423 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:09:53,636 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:09:53,636 INFO L82 PathProgramCache]: Analyzing trace with hash -662388345, now seen corresponding path program 47 times [2018-11-07 22:09:53,636 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:09:53,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:09:53,637 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:09:53,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:09:53,637 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:09:53,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:09:54,741 INFO L134 CoverageAnalysis]: Checked inductivity of 6580 backedges. 0 proven. 6580 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:09:54,742 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:09:54,742 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:09:54,742 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:09:54,742 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:09:54,742 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:09:54,742 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:09:54,752 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:09:54,752 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown