java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_true-unreach-call2_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:29:22,507 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:29:22,509 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:29:22,528 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:29:22,528 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:29:22,529 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:29:22,532 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:29:22,535 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:29:22,538 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:29:22,540 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:29:22,541 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:29:22,541 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:29:22,544 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:29:22,545 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:29:22,546 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:29:22,549 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:29:22,550 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:29:22,560 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:29:22,564 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:29:22,566 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:29:22,567 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:29:22,571 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:29:22,575 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:29:22,575 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:29:22,576 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:29:22,577 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:29:22,579 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:29:22,580 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:29:22,582 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:29:22,584 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:29:22,584 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:29:22,584 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:29:22,589 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-24 12:29:22,614 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:29:22,614 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:29:22,615 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:29:22,616 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:29:22,616 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:29:22,616 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:29:22,616 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-24 12:29:22,616 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:29:22,617 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-24 12:29:22,617 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:29:22,617 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:29:22,617 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:29:22,617 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:29:22,617 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:29:22,619 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:29:22,619 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:29:22,619 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:29:22,619 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:29:22,620 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:29:22,621 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:29:22,621 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:29:22,621 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:29:22,622 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:29:22,622 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:29:22,622 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:29:22,622 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:29:22,622 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:29:22,623 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:29:22,623 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:29:22,623 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:29:22,624 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:29:22,624 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:29:22,624 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:29:22,624 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:29:22,624 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:29:22,624 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:29:22,687 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:29:22,703 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:29:22,708 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:29:22,709 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:29:22,710 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:29:22,711 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/array_true-unreach-call2_true-termination.i [2018-10-24 12:29:22,771 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/44331d156/a007a855b87e45c9af7043f2ac9ac8b0/FLAG6efb9de62 [2018-10-24 12:29:23,196 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:29:23,197 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_true-unreach-call2_true-termination.i [2018-10-24 12:29:23,202 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/44331d156/a007a855b87e45c9af7043f2ac9ac8b0/FLAG6efb9de62 [2018-10-24 12:29:23,220 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/44331d156/a007a855b87e45c9af7043f2ac9ac8b0 [2018-10-24 12:29:23,231 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:29:23,232 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:29:23,233 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:29:23,233 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:29:23,237 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:29:23,238 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:29:23" (1/1) ... [2018-10-24 12:29:23,241 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5f637f1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:29:23, skipping insertion in model container [2018-10-24 12:29:23,241 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:29:23" (1/1) ... [2018-10-24 12:29:23,251 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:29:23,275 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:29:23,480 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:29:23,485 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:29:23,509 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:29:23,534 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:29:23,534 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:29:23 WrapperNode [2018-10-24 12:29:23,534 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:29:23,535 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:29:23,535 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:29:23,536 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:29:23,546 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:29:23" (1/1) ... [2018-10-24 12:29:23,558 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:29:23" (1/1) ... [2018-10-24 12:29:23,586 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:29:23,586 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:29:23,587 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:29:23,587 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:29:23,598 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:29:23" (1/1) ... [2018-10-24 12:29:23,598 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:29:23" (1/1) ... [2018-10-24 12:29:23,600 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:29:23" (1/1) ... [2018-10-24 12:29:23,600 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:29:23" (1/1) ... [2018-10-24 12:29:23,606 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:29:23" (1/1) ... [2018-10-24 12:29:23,611 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:29:23" (1/1) ... [2018-10-24 12:29:23,612 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:29:23" (1/1) ... [2018-10-24 12:29:23,614 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:29:23,615 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:29:23,615 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:29:23,615 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:29:23,616 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:29:23" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:29:23,749 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:29:23,750 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:29:23,750 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:29:23,750 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:29:23,750 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:29:23,750 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:29:23,750 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:29:23,751 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:29:24,079 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:29:24,079 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:29:24 BoogieIcfgContainer [2018-10-24 12:29:24,080 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:29:24,080 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:29:24,080 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:29:24,084 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:29:24,084 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:29:23" (1/3) ... [2018-10-24 12:29:24,085 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77ef926 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:29:24, skipping insertion in model container [2018-10-24 12:29:24,085 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:29:23" (2/3) ... [2018-10-24 12:29:24,085 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77ef926 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:29:24, skipping insertion in model container [2018-10-24 12:29:24,086 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:29:24" (3/3) ... [2018-10-24 12:29:24,087 INFO L112 eAbstractionObserver]: Analyzing ICFG array_true-unreach-call2_true-termination.i [2018-10-24 12:29:24,096 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:29:24,104 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:29:24,121 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:29:24,156 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:29:24,156 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:29:24,156 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:29:24,157 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:29:24,157 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:29:24,157 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:29:24,157 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:29:24,157 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:29:24,176 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-10-24 12:29:24,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-24 12:29:24,182 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:24,183 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:24,185 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:24,192 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:24,193 INFO L82 PathProgramCache]: Analyzing trace with hash -173834890, now seen corresponding path program 1 times [2018-10-24 12:29:24,196 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:24,245 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:24,245 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:24,245 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:24,245 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:24,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:24,331 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:24,333 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:29:24,334 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:29:24,334 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:29:24,338 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:29:24,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:29:24,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:29:24,356 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2018-10-24 12:29:24,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:24,379 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-10-24 12:29:24,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:29:24,380 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2018-10-24 12:29:24,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:24,389 INFO L225 Difference]: With dead ends: 35 [2018-10-24 12:29:24,390 INFO L226 Difference]: Without dead ends: 15 [2018-10-24 12:29:24,393 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:29:24,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-24 12:29:24,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-24 12:29:24,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-24 12:29:24,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-24 12:29:24,431 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-10-24 12:29:24,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:24,432 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-24 12:29:24,432 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:29:24,432 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-24 12:29:24,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 12:29:24,433 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:24,433 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:24,433 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:24,434 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:24,434 INFO L82 PathProgramCache]: Analyzing trace with hash -737648989, now seen corresponding path program 1 times [2018-10-24 12:29:24,434 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:24,435 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:24,436 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:24,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:24,436 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:24,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:24,525 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:24,526 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:29:24,526 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:29:24,526 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:29:24,528 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:29:24,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:29:24,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:29:24,529 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 3 states. [2018-10-24 12:29:24,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:24,596 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-24 12:29:24,597 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:29:24,597 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2018-10-24 12:29:24,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:24,598 INFO L225 Difference]: With dead ends: 24 [2018-10-24 12:29:24,598 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 12:29:24,599 INFO L605 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 [2018-10-24 12:29:24,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 12:29:24,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-10-24 12:29:24,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-24 12:29:24,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-24 12:29:24,604 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2018-10-24 12:29:24,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:24,605 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-24 12:29:24,605 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:29:24,605 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-24 12:29:24,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-24 12:29:24,606 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:24,606 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:24,610 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:24,610 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:24,610 INFO L82 PathProgramCache]: Analyzing trace with hash -1154592614, now seen corresponding path program 1 times [2018-10-24 12:29:24,610 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:24,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:24,611 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:24,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:24,613 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:24,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:24,729 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:24,730 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:24,730 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:24,731 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-10-24 12:29:24,733 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [29], [35], [36], [37], [39] [2018-10-24 12:29:24,769 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:29:24,769 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:29:25,083 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:29:25,084 INFO L272 AbstractInterpreter]: Visited 15 different actions 31 times. Merged at 5 different actions 10 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 34 variables. [2018-10-24 12:29:25,108 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:25,109 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:29:25,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:25,110 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:25,119 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:25,119 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:25,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:25,177 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:25,234 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:25,235 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:25,342 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:25,366 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:25,367 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2018-10-24 12:29:25,367 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:25,367 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:29:25,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:29:25,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:29:25,369 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 5 states. [2018-10-24 12:29:25,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:25,453 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-24 12:29:25,454 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:29:25,454 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2018-10-24 12:29:25,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:25,455 INFO L225 Difference]: With dead ends: 27 [2018-10-24 12:29:25,455 INFO L226 Difference]: Without dead ends: 21 [2018-10-24 12:29:25,456 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:29:25,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-24 12:29:25,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2018-10-24 12:29:25,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-24 12:29:25,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-24 12:29:25,461 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2018-10-24 12:29:25,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:25,461 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-24 12:29:25,461 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:29:25,461 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-24 12:29:25,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-24 12:29:25,462 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:25,462 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:25,463 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:25,463 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:25,463 INFO L82 PathProgramCache]: Analyzing trace with hash -1276704957, now seen corresponding path program 2 times [2018-10-24 12:29:25,463 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:25,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:25,464 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:25,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:25,465 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:25,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:25,579 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:25,579 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:25,580 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:25,580 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:25,580 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:25,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:25,580 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-10-24 12:29:25,596 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:25,597 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:25,686 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:29:25,686 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:25,690 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:25,784 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:25,785 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:25,921 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:25,941 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:25,941 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-10-24 12:29:25,941 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:25,942 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:29:25,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:29:25,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:29:25,943 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 6 states. [2018-10-24 12:29:26,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:26,005 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-24 12:29:26,005 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:29:26,006 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-10-24 12:29:26,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:26,007 INFO L225 Difference]: With dead ends: 30 [2018-10-24 12:29:26,007 INFO L226 Difference]: Without dead ends: 24 [2018-10-24 12:29:26,007 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:29:26,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-24 12:29:26,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2018-10-24 12:29:26,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-24 12:29:26,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-24 12:29:26,012 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2018-10-24 12:29:26,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:26,013 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-24 12:29:26,013 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:29:26,013 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-24 12:29:26,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-24 12:29:26,014 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:26,014 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:26,014 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:26,015 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:26,015 INFO L82 PathProgramCache]: Analyzing trace with hash -1288215558, now seen corresponding path program 3 times [2018-10-24 12:29:26,015 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:26,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:26,016 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:26,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:26,016 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:26,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:26,200 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:26,200 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:26,200 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:26,201 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:26,201 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:26,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:26,202 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:26,216 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:26,216 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:26,259 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:26,259 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:26,262 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:26,284 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:26,285 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:26,388 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:26,418 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:26,419 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2018-10-24 12:29:26,419 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:26,419 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:29:26,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:29:26,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:29:26,420 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 7 states. [2018-10-24 12:29:26,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:26,484 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-24 12:29:26,486 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:29:26,486 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2018-10-24 12:29:26,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:26,487 INFO L225 Difference]: With dead ends: 33 [2018-10-24 12:29:26,488 INFO L226 Difference]: Without dead ends: 27 [2018-10-24 12:29:26,488 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:29:26,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-24 12:29:26,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-24 12:29:26,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 12:29:26,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-24 12:29:26,494 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2018-10-24 12:29:26,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:26,495 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-24 12:29:26,495 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:29:26,495 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-24 12:29:26,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 12:29:26,496 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:26,496 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:26,496 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:26,496 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:26,497 INFO L82 PathProgramCache]: Analyzing trace with hash -603146269, now seen corresponding path program 4 times [2018-10-24 12:29:26,497 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:26,498 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:26,498 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:26,498 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:26,498 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:26,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:26,713 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:26,714 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:26,714 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:26,714 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:26,714 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:26,714 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:26,715 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:26,733 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:26,733 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:26,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:26,788 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:26,899 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:26,899 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:27,165 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:27,189 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:27,189 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-10-24 12:29:27,189 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:27,190 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:29:27,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:29:27,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:29:27,190 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 8 states. [2018-10-24 12:29:27,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:27,240 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-24 12:29:27,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:29:27,242 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2018-10-24 12:29:27,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:27,243 INFO L225 Difference]: With dead ends: 36 [2018-10-24 12:29:27,243 INFO L226 Difference]: Without dead ends: 30 [2018-10-24 12:29:27,244 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:29:27,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-24 12:29:27,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-24 12:29:27,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-24 12:29:27,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-10-24 12:29:27,249 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2018-10-24 12:29:27,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:27,250 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-10-24 12:29:27,250 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:29:27,250 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-10-24 12:29:27,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-24 12:29:27,251 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:27,251 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:27,251 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:27,252 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:27,252 INFO L82 PathProgramCache]: Analyzing trace with hash -1388548262, now seen corresponding path program 5 times [2018-10-24 12:29:27,252 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:27,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:27,253 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:27,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:27,253 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:27,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:27,386 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:27,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:27,386 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:27,387 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:27,387 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:27,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:27,387 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:27,403 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:27,404 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:27,473 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:29:27,473 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:27,476 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:27,496 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:27,496 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:27,733 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:27,755 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:27,756 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-10-24 12:29:27,756 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:27,756 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:29:27,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:29:27,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:29:27,757 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 9 states. [2018-10-24 12:29:27,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:27,841 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-24 12:29:27,842 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:29:27,842 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2018-10-24 12:29:27,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:27,843 INFO L225 Difference]: With dead ends: 39 [2018-10-24 12:29:27,843 INFO L226 Difference]: Without dead ends: 33 [2018-10-24 12:29:27,844 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:29:27,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-24 12:29:27,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-10-24 12:29:27,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-24 12:29:27,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-24 12:29:27,848 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2018-10-24 12:29:27,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:27,849 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-24 12:29:27,849 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:29:27,849 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-24 12:29:27,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-24 12:29:27,850 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:27,850 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:27,850 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:27,851 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:27,851 INFO L82 PathProgramCache]: Analyzing trace with hash -317493117, now seen corresponding path program 6 times [2018-10-24 12:29:27,851 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:27,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:27,852 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:27,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:27,852 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:27,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:28,099 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:28,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:28,100 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:28,100 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:28,100 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:28,101 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:28,101 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:28,108 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:28,108 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:28,172 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:28,172 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:28,175 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:28,279 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:28,279 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:28,770 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:28,790 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:28,790 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2018-10-24 12:29:28,791 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:28,791 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:29:28,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:29:28,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:29:28,792 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 10 states. [2018-10-24 12:29:28,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:28,840 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-24 12:29:28,841 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:29:28,841 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2018-10-24 12:29:28,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:28,842 INFO L225 Difference]: With dead ends: 42 [2018-10-24 12:29:28,843 INFO L226 Difference]: Without dead ends: 36 [2018-10-24 12:29:28,843 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:29:28,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-24 12:29:28,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-10-24 12:29:28,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-24 12:29:28,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-10-24 12:29:28,850 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2018-10-24 12:29:28,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:28,851 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-10-24 12:29:28,851 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:29:28,851 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-10-24 12:29:28,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-24 12:29:28,852 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:28,852 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:28,852 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:28,853 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:28,853 INFO L82 PathProgramCache]: Analyzing trace with hash 174289594, now seen corresponding path program 7 times [2018-10-24 12:29:28,853 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:28,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:28,854 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:28,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:28,855 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:28,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:29,020 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:29,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:29,021 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:29,021 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:29,021 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:29,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:29,021 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:29,029 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:29,029 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:29,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:29,073 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:29,088 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:29,089 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:29,296 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:29,317 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:29,318 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-10-24 12:29:29,318 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:29,318 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:29:29,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:29:29,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:29:29,319 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 11 states. [2018-10-24 12:29:29,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:29,375 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-24 12:29:29,377 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:29:29,377 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 34 [2018-10-24 12:29:29,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:29,378 INFO L225 Difference]: With dead ends: 45 [2018-10-24 12:29:29,379 INFO L226 Difference]: Without dead ends: 39 [2018-10-24 12:29:29,379 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:29:29,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-24 12:29:29,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-24 12:29:29,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-24 12:29:29,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-24 12:29:29,384 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2018-10-24 12:29:29,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:29,385 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-24 12:29:29,385 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:29:29,385 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-24 12:29:29,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-24 12:29:29,386 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:29,386 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:29,387 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:29,387 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:29,387 INFO L82 PathProgramCache]: Analyzing trace with hash 739586339, now seen corresponding path program 8 times [2018-10-24 12:29:29,387 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:29,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:29,388 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:29,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:29,388 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:29,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:29,535 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:29,535 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:29,535 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:29,535 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:29,536 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:29,536 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:29,536 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:29,546 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:29,547 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:29,663 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:29:29,663 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:29,667 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:29,723 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:29,723 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:29,980 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:30,002 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:30,002 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-10-24 12:29:30,003 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:30,003 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:29:30,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:29:30,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:29:30,004 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 12 states. [2018-10-24 12:29:30,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:30,124 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-24 12:29:30,126 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:29:30,126 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 37 [2018-10-24 12:29:30,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:30,127 INFO L225 Difference]: With dead ends: 48 [2018-10-24 12:29:30,127 INFO L226 Difference]: Without dead ends: 42 [2018-10-24 12:29:30,128 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:29:30,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-24 12:29:30,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-10-24 12:29:30,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-24 12:29:30,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-10-24 12:29:30,133 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2018-10-24 12:29:30,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:30,133 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-10-24 12:29:30,134 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:29:30,134 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-10-24 12:29:30,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-24 12:29:30,135 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:30,135 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:30,135 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:30,136 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:30,136 INFO L82 PathProgramCache]: Analyzing trace with hash 928149018, now seen corresponding path program 9 times [2018-10-24 12:29:30,136 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:30,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:30,137 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:30,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:30,137 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:30,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:30,433 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:30,433 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:30,433 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:30,434 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:30,434 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:30,434 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:30,434 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:30,441 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:30,442 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:30,495 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:30,496 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:30,499 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:30,572 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:30,572 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:30,920 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:30,942 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:30,942 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2018-10-24 12:29:30,942 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:30,942 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:29:30,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:29:30,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:29:30,943 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 13 states. [2018-10-24 12:29:30,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:30,998 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-24 12:29:30,999 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:29:30,999 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 40 [2018-10-24 12:29:31,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:31,001 INFO L225 Difference]: With dead ends: 51 [2018-10-24 12:29:31,001 INFO L226 Difference]: Without dead ends: 45 [2018-10-24 12:29:31,002 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:29:31,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-24 12:29:31,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-10-24 12:29:31,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-24 12:29:31,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-24 12:29:31,007 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2018-10-24 12:29:31,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:31,007 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-24 12:29:31,007 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:29:31,007 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-24 12:29:31,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-24 12:29:31,008 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:31,009 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:31,009 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:31,009 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:31,009 INFO L82 PathProgramCache]: Analyzing trace with hash 581695939, now seen corresponding path program 10 times [2018-10-24 12:29:31,009 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:31,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:31,010 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:31,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:31,011 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:31,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:31,689 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:31,689 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:31,689 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:31,689 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:31,690 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:31,690 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:31,690 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:31,709 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:31,710 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:31,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:31,766 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:31,881 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:31,881 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:32,143 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:32,166 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:32,167 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-10-24 12:29:32,167 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:32,167 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:29:32,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:29:32,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:29:32,168 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 14 states. [2018-10-24 12:29:32,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:32,225 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-24 12:29:32,227 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:29:32,227 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 43 [2018-10-24 12:29:32,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:32,229 INFO L225 Difference]: With dead ends: 54 [2018-10-24 12:29:32,229 INFO L226 Difference]: Without dead ends: 48 [2018-10-24 12:29:32,230 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:29:32,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-24 12:29:32,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2018-10-24 12:29:32,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-24 12:29:32,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-10-24 12:29:32,235 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2018-10-24 12:29:32,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:32,235 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-10-24 12:29:32,236 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:29:32,236 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-10-24 12:29:32,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-24 12:29:32,237 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:32,237 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:32,237 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:32,237 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:32,237 INFO L82 PathProgramCache]: Analyzing trace with hash 204431738, now seen corresponding path program 11 times [2018-10-24 12:29:32,238 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:32,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:32,238 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:32,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:32,239 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:32,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:32,778 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:32,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:32,779 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:32,779 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:32,779 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:32,779 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:32,779 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:32,788 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:32,788 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:32,953 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:29:32,953 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:32,957 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:32,986 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:32,986 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:33,279 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:33,311 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:33,312 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-10-24 12:29:33,312 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:33,312 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:29:33,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:29:33,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:29:33,313 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 15 states. [2018-10-24 12:29:33,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:33,493 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-24 12:29:33,493 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:29:33,493 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 46 [2018-10-24 12:29:33,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:33,495 INFO L225 Difference]: With dead ends: 57 [2018-10-24 12:29:33,495 INFO L226 Difference]: Without dead ends: 51 [2018-10-24 12:29:33,496 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:29:33,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-24 12:29:33,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2018-10-24 12:29:33,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-24 12:29:33,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-24 12:29:33,502 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 46 [2018-10-24 12:29:33,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:33,502 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-24 12:29:33,503 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:29:33,503 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-24 12:29:33,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 12:29:33,504 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:33,504 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:33,504 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:33,504 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:33,504 INFO L82 PathProgramCache]: Analyzing trace with hash 1056033379, now seen corresponding path program 12 times [2018-10-24 12:29:33,505 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:33,505 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:33,506 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:33,506 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:33,506 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:33,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:33,871 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:33,871 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:33,871 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:33,871 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:33,872 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:33,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:33,872 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:33,880 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:33,880 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:33,929 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:33,930 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:33,933 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:33,958 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:33,959 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:34,194 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:34,215 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:34,216 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2018-10-24 12:29:34,216 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:34,216 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:29:34,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:29:34,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:29:34,217 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 16 states. [2018-10-24 12:29:34,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:34,355 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-24 12:29:34,356 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:29:34,356 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 49 [2018-10-24 12:29:34,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:34,357 INFO L225 Difference]: With dead ends: 60 [2018-10-24 12:29:34,357 INFO L226 Difference]: Without dead ends: 54 [2018-10-24 12:29:34,358 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:29:34,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-24 12:29:34,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-10-24 12:29:34,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-24 12:29:34,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-10-24 12:29:34,363 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 49 [2018-10-24 12:29:34,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:34,363 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-10-24 12:29:34,363 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:29:34,363 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-10-24 12:29:34,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-24 12:29:34,364 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:34,365 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:34,367 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:34,367 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:34,367 INFO L82 PathProgramCache]: Analyzing trace with hash 748702938, now seen corresponding path program 13 times [2018-10-24 12:29:34,367 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:34,370 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:34,370 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:34,370 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:34,370 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:34,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:34,633 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:34,633 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:34,633 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:34,634 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:34,634 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:34,634 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:34,634 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:34,641 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:34,642 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:34,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:34,710 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:34,799 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:34,799 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:35,217 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:35,239 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:35,239 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-10-24 12:29:35,239 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:35,240 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:29:35,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:29:35,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:29:35,241 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 17 states. [2018-10-24 12:29:35,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:35,347 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-24 12:29:35,347 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:29:35,347 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 52 [2018-10-24 12:29:35,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:35,348 INFO L225 Difference]: With dead ends: 63 [2018-10-24 12:29:35,348 INFO L226 Difference]: Without dead ends: 57 [2018-10-24 12:29:35,349 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:29:35,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-24 12:29:35,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2018-10-24 12:29:35,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-24 12:29:35,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-24 12:29:35,356 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 52 [2018-10-24 12:29:35,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:35,356 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-24 12:29:35,356 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:29:35,356 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-24 12:29:35,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-24 12:29:35,357 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:35,357 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:35,357 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:35,358 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:35,358 INFO L82 PathProgramCache]: Analyzing trace with hash 1937810179, now seen corresponding path program 14 times [2018-10-24 12:29:35,358 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:35,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:35,359 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:35,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:35,359 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:35,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:35,605 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:35,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:35,605 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:35,606 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:35,606 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:35,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:35,606 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:35,615 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:35,615 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:35,929 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-24 12:29:35,929 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:35,933 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:35,951 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:35,952 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:36,434 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:36,456 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:36,456 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-10-24 12:29:36,456 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:36,456 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:29:36,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:29:36,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:29:36,457 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 18 states. [2018-10-24 12:29:36,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:36,542 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-24 12:29:36,542 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:29:36,542 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 55 [2018-10-24 12:29:36,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:36,543 INFO L225 Difference]: With dead ends: 66 [2018-10-24 12:29:36,543 INFO L226 Difference]: Without dead ends: 60 [2018-10-24 12:29:36,544 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:29:36,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-24 12:29:36,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2018-10-24 12:29:36,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-24 12:29:36,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-10-24 12:29:36,549 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 55 [2018-10-24 12:29:36,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:36,549 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-10-24 12:29:36,549 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:29:36,550 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-10-24 12:29:36,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-24 12:29:36,550 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:36,550 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:36,551 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:36,551 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:36,551 INFO L82 PathProgramCache]: Analyzing trace with hash 1741369402, now seen corresponding path program 15 times [2018-10-24 12:29:36,551 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:36,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:36,552 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:36,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:36,552 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:36,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:36,789 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:36,789 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:36,789 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:36,789 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:36,790 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:36,790 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:36,790 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:36,797 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:36,797 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:36,863 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:36,863 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:36,866 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:36,912 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:36,912 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:38,069 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:38,090 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:38,090 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2018-10-24 12:29:38,090 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:38,091 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:29:38,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:29:38,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:29:38,092 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 19 states. [2018-10-24 12:29:38,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:38,227 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-24 12:29:38,230 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:29:38,230 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 58 [2018-10-24 12:29:38,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:38,231 INFO L225 Difference]: With dead ends: 69 [2018-10-24 12:29:38,231 INFO L226 Difference]: Without dead ends: 63 [2018-10-24 12:29:38,232 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:29:38,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-24 12:29:38,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2018-10-24 12:29:38,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-24 12:29:38,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2018-10-24 12:29:38,237 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 58 [2018-10-24 12:29:38,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:38,237 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2018-10-24 12:29:38,237 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:29:38,238 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2018-10-24 12:29:38,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-24 12:29:38,238 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:38,239 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:38,239 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:38,239 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:38,239 INFO L82 PathProgramCache]: Analyzing trace with hash -680361053, now seen corresponding path program 16 times [2018-10-24 12:29:38,239 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:38,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:38,240 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:38,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:38,241 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:38,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:38,551 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:38,551 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:38,551 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:38,551 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:38,552 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:38,552 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:38,552 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:38,559 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:38,559 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:38,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:38,644 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:38,668 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:38,668 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:39,593 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:39,617 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:39,617 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-10-24 12:29:39,617 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:39,618 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:29:39,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:29:39,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:29:39,619 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand 20 states. [2018-10-24 12:29:39,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:39,727 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-24 12:29:39,727 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:29:39,728 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 61 [2018-10-24 12:29:39,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:39,729 INFO L225 Difference]: With dead ends: 72 [2018-10-24 12:29:39,729 INFO L226 Difference]: Without dead ends: 66 [2018-10-24 12:29:39,730 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:29:39,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-24 12:29:39,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2018-10-24 12:29:39,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-24 12:29:39,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-10-24 12:29:39,735 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 61 [2018-10-24 12:29:39,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:39,735 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-10-24 12:29:39,735 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:29:39,735 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-10-24 12:29:39,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-24 12:29:39,736 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:39,736 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:39,736 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:39,736 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:39,737 INFO L82 PathProgramCache]: Analyzing trace with hash 408292250, now seen corresponding path program 17 times [2018-10-24 12:29:39,737 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:39,737 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:39,737 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:39,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:39,738 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:39,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:40,796 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:40,796 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:40,796 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:40,796 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:40,797 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:40,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:40,797 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:40,806 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:40,807 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:41,356 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-24 12:29:41,356 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:41,360 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:41,395 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:41,395 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:41,780 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:41,804 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:41,804 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-10-24 12:29:41,804 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:41,805 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:29:41,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:29:41,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:29:41,806 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 21 states. [2018-10-24 12:29:41,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:41,914 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-24 12:29:41,914 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:29:41,915 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 64 [2018-10-24 12:29:41,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:41,916 INFO L225 Difference]: With dead ends: 75 [2018-10-24 12:29:41,916 INFO L226 Difference]: Without dead ends: 69 [2018-10-24 12:29:41,917 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:29:41,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-24 12:29:41,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2018-10-24 12:29:41,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-10-24 12:29:41,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2018-10-24 12:29:41,922 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 64 [2018-10-24 12:29:41,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:41,923 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2018-10-24 12:29:41,923 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:29:41,923 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2018-10-24 12:29:41,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-24 12:29:41,923 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:41,924 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:41,924 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:41,924 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:41,924 INFO L82 PathProgramCache]: Analyzing trace with hash 1180789827, now seen corresponding path program 18 times [2018-10-24 12:29:41,924 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:41,925 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:41,925 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:41,925 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:41,925 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:41,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:42,607 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:42,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:42,608 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:42,608 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:42,608 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:42,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:42,608 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:42,618 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:42,618 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:42,696 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:42,697 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:42,699 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:42,723 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:42,723 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:43,471 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:43,491 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:43,491 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2018-10-24 12:29:43,491 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:43,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:29:43,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:29:43,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:29:43,493 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 22 states. [2018-10-24 12:29:43,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:43,591 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-24 12:29:43,591 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:29:43,591 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 67 [2018-10-24 12:29:43,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:43,592 INFO L225 Difference]: With dead ends: 78 [2018-10-24 12:29:43,593 INFO L226 Difference]: Without dead ends: 72 [2018-10-24 12:29:43,594 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:29:43,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-24 12:29:43,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2018-10-24 12:29:43,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-10-24 12:29:43,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2018-10-24 12:29:43,598 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 67 [2018-10-24 12:29:43,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:43,599 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2018-10-24 12:29:43,599 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:29:43,599 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2018-10-24 12:29:43,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-10-24 12:29:43,599 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:43,599 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:43,600 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:43,600 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:43,600 INFO L82 PathProgramCache]: Analyzing trace with hash -2073633030, now seen corresponding path program 19 times [2018-10-24 12:29:43,600 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:43,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:43,600 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:43,601 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:43,601 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:43,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:43,931 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:43,931 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:43,931 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:43,931 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:43,931 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:43,931 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:43,931 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:43,940 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:43,941 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:44,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:44,021 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:44,041 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:44,041 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:44,562 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:44,583 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:44,583 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-10-24 12:29:44,583 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:44,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:29:44,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:29:44,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:29:44,585 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 23 states. [2018-10-24 12:29:44,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:44,684 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-24 12:29:44,685 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:29:44,685 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 70 [2018-10-24 12:29:44,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:44,686 INFO L225 Difference]: With dead ends: 81 [2018-10-24 12:29:44,686 INFO L226 Difference]: Without dead ends: 75 [2018-10-24 12:29:44,688 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:29:44,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-24 12:29:44,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2018-10-24 12:29:44,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-24 12:29:44,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 74 transitions. [2018-10-24 12:29:44,691 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 74 transitions. Word has length 70 [2018-10-24 12:29:44,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:44,691 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 74 transitions. [2018-10-24 12:29:44,691 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:29:44,692 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 74 transitions. [2018-10-24 12:29:44,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-24 12:29:44,692 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:44,692 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:44,693 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:44,693 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:44,693 INFO L82 PathProgramCache]: Analyzing trace with hash 6773987, now seen corresponding path program 20 times [2018-10-24 12:29:44,693 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:44,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:44,694 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:44,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:44,694 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:44,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:44,999 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:44,999 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:44,999 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:44,999 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:45,000 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:45,000 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:45,000 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:45,007 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:45,007 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:46,708 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-24 12:29:46,708 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:46,715 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:46,739 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:46,739 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:47,496 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:47,518 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:47,518 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-10-24 12:29:47,518 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:47,519 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:29:47,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:29:47,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:29:47,520 INFO L87 Difference]: Start difference. First operand 74 states and 74 transitions. Second operand 24 states. [2018-10-24 12:29:47,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:47,621 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2018-10-24 12:29:47,624 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:29:47,624 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 73 [2018-10-24 12:29:47,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:47,625 INFO L225 Difference]: With dead ends: 84 [2018-10-24 12:29:47,626 INFO L226 Difference]: Without dead ends: 78 [2018-10-24 12:29:47,627 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:29:47,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-24 12:29:47,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2018-10-24 12:29:47,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-24 12:29:47,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2018-10-24 12:29:47,630 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 73 [2018-10-24 12:29:47,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:47,630 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2018-10-24 12:29:47,630 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:29:47,630 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2018-10-24 12:29:47,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-24 12:29:47,630 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:47,631 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:47,631 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:47,631 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:47,631 INFO L82 PathProgramCache]: Analyzing trace with hash 1034136154, now seen corresponding path program 21 times [2018-10-24 12:29:47,631 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:47,632 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:47,632 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:47,632 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:47,632 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:47,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:48,188 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:48,189 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:48,189 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:48,189 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:48,189 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:48,189 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:48,189 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:48,197 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:48,198 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:48,276 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:48,277 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:48,280 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:48,306 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:48,307 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:48,997 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:49,017 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:49,017 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2018-10-24 12:29:49,018 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:49,018 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:29:49,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:29:49,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:29:49,019 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 25 states. [2018-10-24 12:29:49,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:49,141 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-10-24 12:29:49,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 12:29:49,143 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 76 [2018-10-24 12:29:49,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:49,145 INFO L225 Difference]: With dead ends: 87 [2018-10-24 12:29:49,145 INFO L226 Difference]: Without dead ends: 81 [2018-10-24 12:29:49,146 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:29:49,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-24 12:29:49,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2018-10-24 12:29:49,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-10-24 12:29:49,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 80 transitions. [2018-10-24 12:29:49,148 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 80 transitions. Word has length 76 [2018-10-24 12:29:49,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:49,148 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 80 transitions. [2018-10-24 12:29:49,148 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:29:49,148 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 80 transitions. [2018-10-24 12:29:49,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:29:49,149 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:49,149 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:49,149 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:49,150 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:49,150 INFO L82 PathProgramCache]: Analyzing trace with hash 1243501955, now seen corresponding path program 22 times [2018-10-24 12:29:49,150 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:49,151 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:49,151 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:49,151 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:49,151 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:49,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:49,480 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:49,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:49,481 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:49,481 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:49,481 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:49,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:49,481 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:49,489 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:49,489 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:49,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:49,579 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:49,637 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:49,637 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:50,231 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:50,252 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:50,253 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-10-24 12:29:50,253 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:50,253 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:29:50,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:29:50,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:29:50,254 INFO L87 Difference]: Start difference. First operand 80 states and 80 transitions. Second operand 26 states. [2018-10-24 12:29:50,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:50,404 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2018-10-24 12:29:50,404 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:29:50,404 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 79 [2018-10-24 12:29:50,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:50,405 INFO L225 Difference]: With dead ends: 90 [2018-10-24 12:29:50,405 INFO L226 Difference]: Without dead ends: 84 [2018-10-24 12:29:50,406 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:29:50,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-24 12:29:50,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2018-10-24 12:29:50,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-10-24 12:29:50,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2018-10-24 12:29:50,409 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 79 [2018-10-24 12:29:50,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:50,410 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2018-10-24 12:29:50,410 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:29:50,410 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2018-10-24 12:29:50,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-10-24 12:29:50,411 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:50,411 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:50,411 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:50,411 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:50,411 INFO L82 PathProgramCache]: Analyzing trace with hash -2127401542, now seen corresponding path program 23 times [2018-10-24 12:29:50,411 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:50,412 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:50,412 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:50,412 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:50,412 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:50,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:50,862 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:50,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:50,862 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:50,862 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:50,862 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:50,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:50,862 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:50,870 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:50,870 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:30:01,318 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-24 12:30:01,319 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:01,327 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:01,357 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:01,357 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:02,152 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:02,175 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:02,175 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-10-24 12:30:02,175 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:02,175 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:30:02,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:30:02,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:30:02,177 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 27 states. [2018-10-24 12:30:02,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:02,272 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-10-24 12:30:02,272 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:30:02,272 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 82 [2018-10-24 12:30:02,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:02,274 INFO L225 Difference]: With dead ends: 93 [2018-10-24 12:30:02,274 INFO L226 Difference]: Without dead ends: 87 [2018-10-24 12:30:02,276 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:30:02,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-24 12:30:02,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2018-10-24 12:30:02,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-10-24 12:30:02,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 86 transitions. [2018-10-24 12:30:02,279 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 86 transitions. Word has length 82 [2018-10-24 12:30:02,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:02,280 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 86 transitions. [2018-10-24 12:30:02,280 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:30:02,280 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 86 transitions. [2018-10-24 12:30:02,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-10-24 12:30:02,281 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:02,281 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:02,281 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:02,281 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:02,281 INFO L82 PathProgramCache]: Analyzing trace with hash 211834403, now seen corresponding path program 24 times [2018-10-24 12:30:02,282 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:02,282 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:02,282 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:02,282 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:02,282 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:02,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:02,806 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:02,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:02,806 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:02,806 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:02,807 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:02,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:02,807 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:02,815 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:30:02,815 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:30:02,902 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:30:02,902 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:02,906 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:02,948 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:02,948 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:04,041 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:04,061 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:04,062 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 53 [2018-10-24 12:30:04,062 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:04,062 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:30:04,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:30:04,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-24 12:30:04,063 INFO L87 Difference]: Start difference. First operand 86 states and 86 transitions. Second operand 28 states. [2018-10-24 12:30:04,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:04,192 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2018-10-24 12:30:04,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:30:04,193 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 85 [2018-10-24 12:30:04,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:04,194 INFO L225 Difference]: With dead ends: 96 [2018-10-24 12:30:04,194 INFO L226 Difference]: Without dead ends: 90 [2018-10-24 12:30:04,196 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-24 12:30:04,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-24 12:30:04,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2018-10-24 12:30:04,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-24 12:30:04,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2018-10-24 12:30:04,199 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 85 [2018-10-24 12:30:04,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:04,199 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2018-10-24 12:30:04,200 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:30:04,200 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2018-10-24 12:30:04,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-10-24 12:30:04,200 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:04,201 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:04,201 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:04,201 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:04,201 INFO L82 PathProgramCache]: Analyzing trace with hash -1749472998, now seen corresponding path program 25 times [2018-10-24 12:30:04,201 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:04,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:04,202 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:04,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:04,202 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:04,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:04,574 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:04,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:04,574 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:04,574 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:04,575 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:04,575 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:04,575 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:04,581 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:04,582 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:30:04,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:04,675 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:04,705 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:04,705 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:05,902 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:05,923 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:05,923 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-10-24 12:30:05,923 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:05,923 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:30:05,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:30:05,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:30:05,925 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 29 states. [2018-10-24 12:30:06,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:06,023 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-10-24 12:30:06,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:30:06,023 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 88 [2018-10-24 12:30:06,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:06,025 INFO L225 Difference]: With dead ends: 99 [2018-10-24 12:30:06,025 INFO L226 Difference]: Without dead ends: 93 [2018-10-24 12:30:06,026 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:30:06,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-24 12:30:06,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2018-10-24 12:30:06,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-10-24 12:30:06,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 92 transitions. [2018-10-24 12:30:06,030 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 92 transitions. Word has length 88 [2018-10-24 12:30:06,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:06,030 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 92 transitions. [2018-10-24 12:30:06,030 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:30:06,030 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 92 transitions. [2018-10-24 12:30:06,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-10-24 12:30:06,031 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:06,031 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:06,031 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:06,031 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:06,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1971805891, now seen corresponding path program 26 times [2018-10-24 12:30:06,031 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:06,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:06,032 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:06,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:06,032 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:06,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:07,160 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:07,161 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:07,161 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:07,161 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:07,161 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:07,161 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:07,161 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:07,168 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:30:07,168 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:30:15,560 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-24 12:30:15,560 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:15,568 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:15,609 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:15,609 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:16,639 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:16,663 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:16,663 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-10-24 12:30:16,663 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:16,664 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:30:16,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:30:16,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:30:16,665 INFO L87 Difference]: Start difference. First operand 92 states and 92 transitions. Second operand 30 states. [2018-10-24 12:30:16,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:16,773 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2018-10-24 12:30:16,777 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:30:16,777 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 91 [2018-10-24 12:30:16,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:16,778 INFO L225 Difference]: With dead ends: 102 [2018-10-24 12:30:16,778 INFO L226 Difference]: Without dead ends: 96 [2018-10-24 12:30:16,780 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:30:16,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-24 12:30:16,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2018-10-24 12:30:16,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-10-24 12:30:16,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2018-10-24 12:30:16,783 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 91 [2018-10-24 12:30:16,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:16,783 INFO L481 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2018-10-24 12:30:16,783 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:30:16,783 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2018-10-24 12:30:16,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-10-24 12:30:16,784 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:16,784 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:16,784 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:16,784 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:16,785 INFO L82 PathProgramCache]: Analyzing trace with hash 895343738, now seen corresponding path program 27 times [2018-10-24 12:30:16,785 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:16,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:16,785 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:16,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:16,786 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:16,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:17,626 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:17,627 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:17,627 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:17,627 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:17,627 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:17,627 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:17,627 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-10-24 12:30:17,642 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:30:17,642 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:17,743 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:30:17,744 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:17,747 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:17,790 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:17,790 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:19,023 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:19,043 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:19,043 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 59 [2018-10-24 12:30:19,044 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:19,044 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:30:19,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:30:19,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-24 12:30:19,045 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 31 states. [2018-10-24 12:30:19,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:19,244 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-10-24 12:30:19,244 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-24 12:30:19,245 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 94 [2018-10-24 12:30:19,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:19,246 INFO L225 Difference]: With dead ends: 105 [2018-10-24 12:30:19,246 INFO L226 Difference]: Without dead ends: 99 [2018-10-24 12:30:19,247 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-24 12:30:19,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-24 12:30:19,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2018-10-24 12:30:19,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-10-24 12:30:19,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 98 transitions. [2018-10-24 12:30:19,251 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 98 transitions. Word has length 94 [2018-10-24 12:30:19,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:19,253 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 98 transitions. [2018-10-24 12:30:19,253 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:30:19,253 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 98 transitions. [2018-10-24 12:30:19,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-10-24 12:30:19,254 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:19,254 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:19,254 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:19,254 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:19,254 INFO L82 PathProgramCache]: Analyzing trace with hash -1762824349, now seen corresponding path program 28 times [2018-10-24 12:30:19,255 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:19,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:19,255 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:19,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:19,255 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:19,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:20,093 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:20,093 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:20,094 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:20,094 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:20,094 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:20,094 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:20,094 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:20,101 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:20,101 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:30:20,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:20,196 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:20,218 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:20,218 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:21,156 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:21,176 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:21,176 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-10-24 12:30:21,176 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:21,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:30:21,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:30:21,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:30:21,178 INFO L87 Difference]: Start difference. First operand 98 states and 98 transitions. Second operand 32 states. [2018-10-24 12:30:21,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:21,311 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2018-10-24 12:30:21,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:30:21,312 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 97 [2018-10-24 12:30:21,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:21,312 INFO L225 Difference]: With dead ends: 108 [2018-10-24 12:30:21,313 INFO L226 Difference]: Without dead ends: 102 [2018-10-24 12:30:21,313 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:30:21,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-10-24 12:30:21,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2018-10-24 12:30:21,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-10-24 12:30:21,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2018-10-24 12:30:21,317 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 97 [2018-10-24 12:30:21,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:21,318 INFO L481 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2018-10-24 12:30:21,318 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:30:21,318 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2018-10-24 12:30:21,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-10-24 12:30:21,318 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:21,319 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:21,319 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:21,319 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:21,319 INFO L82 PathProgramCache]: Analyzing trace with hash -641300518, now seen corresponding path program 29 times [2018-10-24 12:30:21,319 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:21,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:21,320 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:21,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:21,320 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:21,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:22,839 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:22,839 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:22,839 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:22,839 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:22,839 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:22,839 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:22,839 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:22,854 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:30:22,855 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:30:43,284 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-24 12:30:43,284 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:43,295 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:43,327 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:43,327 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:44,529 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:44,553 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:44,553 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-10-24 12:30:44,553 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:44,553 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:30:44,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:30:44,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:30:44,554 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 33 states. [2018-10-24 12:30:44,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:44,751 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-10-24 12:30:44,751 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:30:44,751 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 100 [2018-10-24 12:30:44,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:44,752 INFO L225 Difference]: With dead ends: 111 [2018-10-24 12:30:44,752 INFO L226 Difference]: Without dead ends: 105 [2018-10-24 12:30:44,753 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:30:44,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-24 12:30:44,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2018-10-24 12:30:44,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2018-10-24 12:30:44,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 104 transitions. [2018-10-24 12:30:44,757 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 104 transitions. Word has length 100 [2018-10-24 12:30:44,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:44,757 INFO L481 AbstractCegarLoop]: Abstraction has 104 states and 104 transitions. [2018-10-24 12:30:44,757 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:30:44,758 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 104 transitions. [2018-10-24 12:30:44,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-10-24 12:30:44,758 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:44,758 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:44,759 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:44,759 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:44,759 INFO L82 PathProgramCache]: Analyzing trace with hash 124553219, now seen corresponding path program 30 times [2018-10-24 12:30:44,759 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:44,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:44,760 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:44,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:44,760 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:44,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:45,858 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:45,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:45,858 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:45,859 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:45,859 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:45,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:45,859 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-24 12:30:45,869 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:30:45,870 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:30:45,981 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:30:45,981 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:45,985 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:46,092 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:46,093 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:47,722 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:47,745 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:47,746 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 65 [2018-10-24 12:30:47,746 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:47,746 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:30:47,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:30:47,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-10-24 12:30:47,748 INFO L87 Difference]: Start difference. First operand 104 states and 104 transitions. Second operand 34 states. [2018-10-24 12:30:47,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:47,910 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2018-10-24 12:30:47,910 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-24 12:30:47,910 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 103 [2018-10-24 12:30:47,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:47,912 INFO L225 Difference]: With dead ends: 114 [2018-10-24 12:30:47,912 INFO L226 Difference]: Without dead ends: 108 [2018-10-24 12:30:47,913 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-10-24 12:30:47,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2018-10-24 12:30:47,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2018-10-24 12:30:47,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-10-24 12:30:47,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2018-10-24 12:30:47,917 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 103 [2018-10-24 12:30:47,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:47,917 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2018-10-24 12:30:47,917 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:30:47,917 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2018-10-24 12:30:47,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2018-10-24 12:30:47,918 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:47,918 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:47,918 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:47,918 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:47,919 INFO L82 PathProgramCache]: Analyzing trace with hash 806955834, now seen corresponding path program 31 times [2018-10-24 12:30:47,919 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:47,919 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:47,919 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:47,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:47,920 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:47,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:48,472 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:48,472 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:48,472 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:48,472 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:48,473 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:48,473 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:48,473 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:48,480 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:48,480 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:30:48,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:48,592 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:48,631 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:48,631 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:50,034 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:50,055 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:50,055 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2018-10-24 12:30:50,055 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:50,056 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:30:50,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:30:50,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:30:50,056 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 35 states. [2018-10-24 12:30:50,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:50,207 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2018-10-24 12:30:50,209 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:30:50,209 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 106 [2018-10-24 12:30:50,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:50,210 INFO L225 Difference]: With dead ends: 117 [2018-10-24 12:30:50,210 INFO L226 Difference]: Without dead ends: 111 [2018-10-24 12:30:50,210 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:30:50,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-10-24 12:30:50,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 110. [2018-10-24 12:30:50,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-10-24 12:30:50,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 110 transitions. [2018-10-24 12:30:50,214 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 110 transitions. Word has length 106 [2018-10-24 12:30:50,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:50,215 INFO L481 AbstractCegarLoop]: Abstraction has 110 states and 110 transitions. [2018-10-24 12:30:50,215 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:30:50,215 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 110 transitions. [2018-10-24 12:30:50,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:30:50,216 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:50,216 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:50,216 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:50,216 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:50,216 INFO L82 PathProgramCache]: Analyzing trace with hash -2111919965, now seen corresponding path program 32 times [2018-10-24 12:30:50,216 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:50,217 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:50,217 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:50,217 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:50,217 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:50,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:50,767 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:50,767 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:50,767 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:50,767 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:50,767 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:50,767 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:50,768 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-24 12:30:50,775 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:30:50,776 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:31:21,951 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-24 12:31:21,951 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:31:21,966 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:31:22,080 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:22,081 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:31:23,267 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:23,290 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:31:23,290 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-10-24 12:31:23,290 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:31:23,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:31:23,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:31:23,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:31:23,292 INFO L87 Difference]: Start difference. First operand 110 states and 110 transitions. Second operand 36 states. [2018-10-24 12:31:23,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:31:23,429 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2018-10-24 12:31:23,429 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:31:23,429 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 109 [2018-10-24 12:31:23,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:31:23,430 INFO L225 Difference]: With dead ends: 120 [2018-10-24 12:31:23,431 INFO L226 Difference]: Without dead ends: 114 [2018-10-24 12:31:23,432 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:31:23,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-24 12:31:23,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2018-10-24 12:31:23,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2018-10-24 12:31:23,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2018-10-24 12:31:23,436 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 109 [2018-10-24 12:31:23,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:31:23,436 INFO L481 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2018-10-24 12:31:23,436 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:31:23,436 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2018-10-24 12:31:23,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2018-10-24 12:31:23,437 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:31:23,437 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:31:23,437 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:31:23,438 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:31:23,438 INFO L82 PathProgramCache]: Analyzing trace with hash 1861994138, now seen corresponding path program 33 times [2018-10-24 12:31:23,438 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:31:23,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:23,439 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:31:23,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:23,439 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:31:23,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:23,999 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:23,999 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:23,999 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:31:23,999 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:31:23,999 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:31:23,999 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:24,000 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:31:24,006 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:31:24,006 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:31:24,125 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:31:24,125 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:31:24,128 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:31:24,155 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:24,155 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:31:25,566 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:25,586 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:31:25,586 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2018-10-24 12:31:25,586 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:31:25,587 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:31:25,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:31:25,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2485, Invalid=2485, Unknown=0, NotChecked=0, Total=4970 [2018-10-24 12:31:25,587 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 37 states. [2018-10-24 12:31:25,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:31:25,863 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-10-24 12:31:25,864 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-24 12:31:25,864 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 112 [2018-10-24 12:31:25,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:31:25,865 INFO L225 Difference]: With dead ends: 123 [2018-10-24 12:31:25,865 INFO L226 Difference]: Without dead ends: 117 [2018-10-24 12:31:25,866 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2485, Invalid=2485, Unknown=0, NotChecked=0, Total=4970 [2018-10-24 12:31:25,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-24 12:31:25,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2018-10-24 12:31:25,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2018-10-24 12:31:25,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 116 transitions. [2018-10-24 12:31:25,870 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 116 transitions. Word has length 112 [2018-10-24 12:31:25,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:31:25,870 INFO L481 AbstractCegarLoop]: Abstraction has 116 states and 116 transitions. [2018-10-24 12:31:25,870 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:31:25,870 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 116 transitions. [2018-10-24 12:31:25,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-10-24 12:31:25,871 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:31:25,871 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:31:25,871 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:31:25,871 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:31:25,872 INFO L82 PathProgramCache]: Analyzing trace with hash -2036477629, now seen corresponding path program 34 times [2018-10-24 12:31:25,872 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:31:25,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:25,872 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:31:25,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:25,873 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:31:25,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:26,481 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:26,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:26,482 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:31:26,482 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:31:26,482 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:31:26,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:26,482 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-24 12:31:26,489 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:31:26,489 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:31:26,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:26,617 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:31:26,719 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:26,719 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:31:28,132 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:28,154 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:31:28,154 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-10-24 12:31:28,154 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:31:28,155 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:31:28,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:31:28,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-24 12:31:28,156 INFO L87 Difference]: Start difference. First operand 116 states and 116 transitions. Second operand 38 states. [2018-10-24 12:31:28,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:31:28,279 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2018-10-24 12:31:28,279 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:31:28,279 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 115 [2018-10-24 12:31:28,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:31:28,281 INFO L225 Difference]: With dead ends: 126 [2018-10-24 12:31:28,281 INFO L226 Difference]: Without dead ends: 120 [2018-10-24 12:31:28,281 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-24 12:31:28,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-10-24 12:31:28,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2018-10-24 12:31:28,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-10-24 12:31:28,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2018-10-24 12:31:28,285 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 115 [2018-10-24 12:31:28,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:31:28,285 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2018-10-24 12:31:28,285 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:31:28,286 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2018-10-24 12:31:28,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2018-10-24 12:31:28,286 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:31:28,286 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:31:28,286 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:31:28,287 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:31:28,287 INFO L82 PathProgramCache]: Analyzing trace with hash -1198237190, now seen corresponding path program 35 times [2018-10-24 12:31:28,287 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:31:28,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:28,287 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:31:28,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:28,288 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:31:28,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:28,928 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:28,928 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:28,928 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:31:28,928 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:31:28,928 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:31:28,928 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:28,928 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:31:28,936 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:31:28,936 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:32:20,002 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-10-24 12:32:20,002 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:32:20,017 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:32:20,133 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:20,133 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:32:21,823 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:21,849 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:32:21,849 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2018-10-24 12:32:21,849 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:32:21,850 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:32:21,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:32:21,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-24 12:32:21,850 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 39 states. [2018-10-24 12:32:22,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:32:22,001 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2018-10-24 12:32:22,003 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:32:22,003 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 118 [2018-10-24 12:32:22,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:32:22,003 INFO L225 Difference]: With dead ends: 129 [2018-10-24 12:32:22,004 INFO L226 Difference]: Without dead ends: 123 [2018-10-24 12:32:22,004 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-24 12:32:22,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-24 12:32:22,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2018-10-24 12:32:22,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-10-24 12:32:22,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 122 transitions. [2018-10-24 12:32:22,007 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 122 transitions. Word has length 118 [2018-10-24 12:32:22,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:32:22,007 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 122 transitions. [2018-10-24 12:32:22,007 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:32:22,007 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 122 transitions. [2018-10-24 12:32:22,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-10-24 12:32:22,008 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:32:22,008 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:32:22,009 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:32:22,009 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:32:22,009 INFO L82 PathProgramCache]: Analyzing trace with hash -117177885, now seen corresponding path program 36 times [2018-10-24 12:32:22,009 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:32:22,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:22,010 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:32:22,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:22,010 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:32:22,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:22,674 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:22,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:22,675 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:32:22,675 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:32:22,675 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:32:22,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:22,675 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-24 12:32:22,683 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:32:22,683 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:32:22,820 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:32:22,820 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:32:22,824 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:32:22,855 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:22,856 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:32:24,565 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:24,586 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:32:24,586 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 77 [2018-10-24 12:32:24,586 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:32:24,587 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:32:24,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:32:24,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2926, Invalid=2926, Unknown=0, NotChecked=0, Total=5852 [2018-10-24 12:32:24,587 INFO L87 Difference]: Start difference. First operand 122 states and 122 transitions. Second operand 40 states. [2018-10-24 12:32:25,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:32:25,258 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2018-10-24 12:32:25,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:32:25,259 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 121 [2018-10-24 12:32:25,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:32:25,260 INFO L225 Difference]: With dead ends: 132 [2018-10-24 12:32:25,260 INFO L226 Difference]: Without dead ends: 126 [2018-10-24 12:32:25,261 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2926, Invalid=2926, Unknown=0, NotChecked=0, Total=5852 [2018-10-24 12:32:25,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-10-24 12:32:25,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2018-10-24 12:32:25,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-10-24 12:32:25,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2018-10-24 12:32:25,265 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 121 [2018-10-24 12:32:25,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:32:25,265 INFO L481 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2018-10-24 12:32:25,266 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:32:25,266 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2018-10-24 12:32:25,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2018-10-24 12:32:25,266 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:32:25,267 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:32:25,267 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:32:25,267 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:32:25,267 INFO L82 PathProgramCache]: Analyzing trace with hash 2055791962, now seen corresponding path program 37 times [2018-10-24 12:32:25,267 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:32:25,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:25,268 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:32:25,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:25,268 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:32:25,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:26,073 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:26,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:26,073 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:32:26,074 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:32:26,074 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:32:26,074 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:26,074 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:32:26,082 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:32:26,082 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:32:26,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:26,218 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:32:26,341 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:26,341 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:32:28,120 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:28,140 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:32:28,140 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2018-10-24 12:32:28,140 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:32:28,141 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:32:28,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:32:28,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:32:28,142 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 41 states. [2018-10-24 12:32:28,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:32:28,336 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-10-24 12:32:28,337 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-24 12:32:28,337 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 124 [2018-10-24 12:32:28,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:32:28,338 INFO L225 Difference]: With dead ends: 135 [2018-10-24 12:32:28,338 INFO L226 Difference]: Without dead ends: 129 [2018-10-24 12:32:28,338 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:32:28,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-10-24 12:32:28,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 128. [2018-10-24 12:32:28,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:32:28,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 128 transitions. [2018-10-24 12:32:28,343 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 128 transitions. Word has length 124 [2018-10-24 12:32:28,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:32:28,343 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 128 transitions. [2018-10-24 12:32:28,343 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:32:28,343 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 128 transitions. [2018-10-24 12:32:28,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-10-24 12:32:28,344 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:32:28,344 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:32:28,344 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:32:28,344 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:32:28,345 INFO L82 PathProgramCache]: Analyzing trace with hash -1041548669, now seen corresponding path program 38 times [2018-10-24 12:32:28,345 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:32:28,345 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:28,345 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:32:28,345 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:28,346 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:32:28,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:29,313 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:29,314 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:29,314 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:32:29,314 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:32:29,314 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:32:29,314 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:29,314 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-24 12:32:29,322 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:32:29,322 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