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-invgen/down_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 09:12:23,112 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 09:12:23,114 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 09:12:23,125 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 09:12:23,126 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 09:12:23,127 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 09:12:23,128 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 09:12:23,130 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 09:12:23,131 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 09:12:23,132 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 09:12:23,133 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 09:12:23,134 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 09:12:23,134 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 09:12:23,135 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 09:12:23,137 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 09:12:23,137 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 09:12:23,138 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 09:12:23,140 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 09:12:23,142 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 09:12:23,143 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 09:12:23,145 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 09:12:23,146 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 09:12:23,148 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 09:12:23,148 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 09:12:23,149 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 09:12:23,152 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 09:12:23,152 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 09:12:23,155 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 09:12:23,156 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 09:12:23,157 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 09:12:23,157 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 09:12:23,158 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-27 09:12:23,160 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 [2018-10-27 09:12:23,185 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 09:12:23,186 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 09:12:23,186 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 09:12:23,189 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 09:12:23,190 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 09:12:23,190 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 09:12:23,190 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-27 09:12:23,190 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 09:12:23,190 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 09:12:23,191 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 09:12:23,191 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 09:12:23,191 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 09:12:23,191 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 09:12:23,191 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 09:12:23,192 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 09:12:23,193 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 09:12:23,193 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 09:12:23,193 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 09:12:23,193 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 09:12:23,193 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 09:12:23,193 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 09:12:23,194 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 09:12:23,194 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 09:12:23,194 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 09:12:23,194 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 09:12:23,194 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 09:12:23,196 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 09:12:23,196 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 09:12:23,197 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 09:12:23,197 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 09:12:23,197 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 09:12:23,197 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 09:12:23,197 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 09:12:23,198 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 09:12:23,198 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 09:12:23,198 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 09:12:23,260 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 09:12:23,276 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 09:12:23,280 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 09:12:23,282 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 09:12:23,282 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 09:12:23,283 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-invgen/down_true-unreach-call_true-termination.i [2018-10-27 09:12:23,344 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/36e199ef1/9d3cfdb9c0024f53a4122c337fc40dcf/FLAG2735506fd [2018-10-27 09:12:23,787 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 09:12:23,788 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/down_true-unreach-call_true-termination.i [2018-10-27 09:12:23,794 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/36e199ef1/9d3cfdb9c0024f53a4122c337fc40dcf/FLAG2735506fd [2018-10-27 09:12:23,814 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/36e199ef1/9d3cfdb9c0024f53a4122c337fc40dcf [2018-10-27 09:12:23,826 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 09:12:23,828 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 09:12:23,831 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 09:12:23,831 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 09:12:23,835 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 09:12:23,836 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:12:23" (1/1) ... [2018-10-27 09:12:23,839 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2447365b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:12:23, skipping insertion in model container [2018-10-27 09:12:23,839 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:12:23" (1/1) ... [2018-10-27 09:12:23,849 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 09:12:23,873 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 09:12:24,065 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:12:24,069 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 09:12:24,086 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:12:24,101 INFO L193 MainTranslator]: Completed translation [2018-10-27 09:12:24,102 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:12:24 WrapperNode [2018-10-27 09:12:24,102 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 09:12:24,103 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 09:12:24,103 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 09:12:24,103 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 09:12:24,112 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:12:24" (1/1) ... [2018-10-27 09:12:24,118 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:12:24" (1/1) ... [2018-10-27 09:12:24,124 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 09:12:24,124 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 09:12:24,124 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 09:12:24,124 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 09:12:24,134 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:12:24" (1/1) ... [2018-10-27 09:12:24,134 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:12:24" (1/1) ... [2018-10-27 09:12:24,135 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:12:24" (1/1) ... [2018-10-27 09:12:24,135 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:12:24" (1/1) ... [2018-10-27 09:12:24,138 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:12:24" (1/1) ... [2018-10-27 09:12:24,143 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:12:24" (1/1) ... [2018-10-27 09:12:24,144 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:12:24" (1/1) ... [2018-10-27 09:12:24,146 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 09:12:24,146 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 09:12:24,146 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 09:12:24,146 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 09:12:24,147 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:12:24" (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 [2018-10-27 09:12:24,204 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 09:12:24,204 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 09:12:24,204 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 09:12:24,204 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 09:12:24,204 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 09:12:24,204 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 09:12:24,205 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 09:12:24,205 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 09:12:24,493 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 09:12:24,493 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:12:24 BoogieIcfgContainer [2018-10-27 09:12:24,494 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 09:12:24,494 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 09:12:24,495 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 09:12:24,498 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 09:12:24,498 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 09:12:23" (1/3) ... [2018-10-27 09:12:24,499 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@734640e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:12:24, skipping insertion in model container [2018-10-27 09:12:24,499 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:12:24" (2/3) ... [2018-10-27 09:12:24,499 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@734640e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:12:24, skipping insertion in model container [2018-10-27 09:12:24,499 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:12:24" (3/3) ... [2018-10-27 09:12:24,501 INFO L112 eAbstractionObserver]: Analyzing ICFG down_true-unreach-call_true-termination.i [2018-10-27 09:12:24,510 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 09:12:24,518 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 09:12:24,532 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 09:12:24,565 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 09:12:24,565 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 09:12:24,566 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 09:12:24,566 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 09:12:24,566 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 09:12:24,566 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 09:12:24,566 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 09:12:24,566 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 09:12:24,585 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2018-10-27 09:12:24,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-27 09:12:24,591 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:24,592 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:24,594 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:24,600 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:24,600 INFO L82 PathProgramCache]: Analyzing trace with hash 123585964, now seen corresponding path program 1 times [2018-10-27 09:12:24,603 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:24,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:24,654 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:24,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:24,655 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:24,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:24,709 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:12:24,711 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:12:24,711 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 09:12:24,712 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:12:24,716 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 09:12:24,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 09:12:24,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 09:12:24,734 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 2 states. [2018-10-27 09:12:24,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:24,756 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2018-10-27 09:12:24,757 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 09:12:24,758 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-10-27 09:12:24,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:24,767 INFO L225 Difference]: With dead ends: 39 [2018-10-27 09:12:24,768 INFO L226 Difference]: Without dead ends: 18 [2018-10-27 09:12:24,771 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 [2018-10-27 09:12:24,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-27 09:12:24,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-27 09:12:24,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-27 09:12:24,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-27 09:12:24,809 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-27 09:12:24,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:24,809 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-27 09:12:24,809 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 09:12:24,810 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-27 09:12:24,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-27 09:12:24,811 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:24,811 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:24,812 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:24,812 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:24,812 INFO L82 PathProgramCache]: Analyzing trace with hash -203615370, now seen corresponding path program 1 times [2018-10-27 09:12:24,812 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:24,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:24,814 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:24,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:24,815 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:24,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:25,040 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:12:25,040 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:12:25,041 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-27 09:12:25,041 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:12:25,042 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 09:12:25,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 09:12:25,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-27 09:12:25,043 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 5 states. [2018-10-27 09:12:25,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:25,155 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2018-10-27 09:12:25,155 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 09:12:25,155 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2018-10-27 09:12:25,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:25,156 INFO L225 Difference]: With dead ends: 33 [2018-10-27 09:12:25,156 INFO L226 Difference]: Without dead ends: 20 [2018-10-27 09:12:25,157 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-10-27 09:12:25,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-27 09:12:25,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-27 09:12:25,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-27 09:12:25,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2018-10-27 09:12:25,163 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 14 [2018-10-27 09:12:25,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:25,163 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2018-10-27 09:12:25,163 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 09:12:25,163 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2018-10-27 09:12:25,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-27 09:12:25,164 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:25,164 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:25,164 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:25,165 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:25,165 INFO L82 PathProgramCache]: Analyzing trace with hash 1025157488, now seen corresponding path program 1 times [2018-10-27 09:12:25,165 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:25,166 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:25,166 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:25,166 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:25,166 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:25,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:25,282 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:12:25,283 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:12:25,283 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-10-27 09:12:25,283 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:12:25,284 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 09:12:25,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 09:12:25,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-10-27 09:12:25,285 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 6 states. [2018-10-27 09:12:25,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:25,502 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2018-10-27 09:12:25,503 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-27 09:12:25,503 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2018-10-27 09:12:25,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:25,505 INFO L225 Difference]: With dead ends: 34 [2018-10-27 09:12:25,506 INFO L226 Difference]: Without dead ends: 32 [2018-10-27 09:12:25,506 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-10-27 09:12:25,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-27 09:12:25,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 27. [2018-10-27 09:12:25,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-27 09:12:25,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-10-27 09:12:25,521 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 16 [2018-10-27 09:12:25,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:25,522 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-10-27 09:12:25,522 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 09:12:25,522 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-10-27 09:12:25,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-27 09:12:25,523 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:25,523 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:25,524 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:25,524 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:25,525 INFO L82 PathProgramCache]: Analyzing trace with hash -1392733261, now seen corresponding path program 1 times [2018-10-27 09:12:25,525 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:25,526 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:25,526 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:25,526 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:25,526 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:25,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:25,674 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:12:25,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:25,676 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:25,677 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-10-27 09:12:25,679 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [18], [22], [28], [30], [36], [39], [41], [44], [46], [47], [48], [49], [51], [52] [2018-10-27 09:12:25,715 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-27 09:12:25,715 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 09:12:25,895 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 09:12:25,896 INFO L272 AbstractInterpreter]: Visited 19 different actions 47 times. Merged at 7 different actions 14 times. Never widened. Found 4 fixpoints after 2 different actions. Largest state had 9 variables. [2018-10-27 09:12:25,925 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:25,926 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 09:12:25,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:25,927 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 [2018-10-27 09:12:25,935 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:25,936 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:12:25,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:25,972 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:25,997 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:12:25,997 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:26,126 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:12:26,148 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:26,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 7 [2018-10-27 09:12:26,149 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:26,149 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 09:12:26,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 09:12:26,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-10-27 09:12:26,150 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 7 states. [2018-10-27 09:12:26,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:26,407 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2018-10-27 09:12:26,407 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 09:12:26,407 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2018-10-27 09:12:26,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:26,410 INFO L225 Difference]: With dead ends: 46 [2018-10-27 09:12:26,410 INFO L226 Difference]: Without dead ends: 29 [2018-10-27 09:12:26,411 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 45 SyntacticMatches, 4 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2018-10-27 09:12:26,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-27 09:12:26,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-10-27 09:12:26,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-27 09:12:26,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2018-10-27 09:12:26,417 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 24 [2018-10-27 09:12:26,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:26,417 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2018-10-27 09:12:26,418 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 09:12:26,418 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2018-10-27 09:12:26,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-27 09:12:26,419 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:26,419 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:26,419 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:26,420 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:26,420 INFO L82 PathProgramCache]: Analyzing trace with hash -782599891, now seen corresponding path program 2 times [2018-10-27 09:12:26,420 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:26,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:26,421 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:26,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:26,421 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:26,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:26,536 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:12:26,536 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:26,537 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:26,537 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:26,537 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:26,537 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:26,537 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:12:26,553 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:12:26,553 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:12:26,587 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 09:12:26,587 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:12:26,590 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:26,689 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:12:26,689 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:26,768 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:12:26,792 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:26,792 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 10 [2018-10-27 09:12:26,792 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:26,793 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 09:12:26,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 09:12:26,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2018-10-27 09:12:26,794 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 10 states. [2018-10-27 09:12:27,127 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 7 DAG size of output: 6 [2018-10-27 09:12:27,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:27,222 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-10-27 09:12:27,223 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 09:12:27,223 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2018-10-27 09:12:27,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:27,225 INFO L225 Difference]: With dead ends: 39 [2018-10-27 09:12:27,225 INFO L226 Difference]: Without dead ends: 37 [2018-10-27 09:12:27,226 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 49 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2018-10-27 09:12:27,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-27 09:12:27,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-10-27 09:12:27,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-27 09:12:27,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2018-10-27 09:12:27,234 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 26 [2018-10-27 09:12:27,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:27,234 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2018-10-27 09:12:27,234 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 09:12:27,234 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2018-10-27 09:12:27,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-27 09:12:27,235 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:27,236 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:27,236 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:27,236 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:27,236 INFO L82 PathProgramCache]: Analyzing trace with hash 1585665648, now seen corresponding path program 3 times [2018-10-27 09:12:27,237 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:27,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:27,238 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:12:27,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:27,238 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:27,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:27,381 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-27 09:12:27,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:27,382 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:27,382 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:27,382 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:27,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:27,383 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 [2018-10-27 09:12:27,397 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:12:27,398 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:12:27,439 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:12:27,439 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:12:27,442 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:27,452 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-27 09:12:27,452 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:27,552 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-27 09:12:27,582 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:27,582 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 9 [2018-10-27 09:12:27,583 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:27,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 09:12:27,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 09:12:27,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2018-10-27 09:12:27,584 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 9 states. [2018-10-27 09:12:27,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:27,751 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2018-10-27 09:12:27,753 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 09:12:27,753 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 34 [2018-10-27 09:12:27,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:27,754 INFO L225 Difference]: With dead ends: 60 [2018-10-27 09:12:27,755 INFO L226 Difference]: Without dead ends: 39 [2018-10-27 09:12:27,756 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2018-10-27 09:12:27,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-27 09:12:27,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-10-27 09:12:27,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-27 09:12:27,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-10-27 09:12:27,763 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 34 [2018-10-27 09:12:27,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:27,763 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-10-27 09:12:27,763 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 09:12:27,764 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-10-27 09:12:27,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-27 09:12:27,765 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:27,765 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:27,765 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:27,765 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:27,766 INFO L82 PathProgramCache]: Analyzing trace with hash -75224214, now seen corresponding path program 4 times [2018-10-27 09:12:27,766 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:27,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:27,767 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:12:27,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:27,767 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:27,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:27,930 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 15 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-27 09:12:27,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:27,930 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:27,930 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:27,930 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:27,931 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:27,931 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 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 [2018-10-27 09:12:27,939 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:27,939 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:12:27,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:27,969 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:28,155 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-27 09:12:28,155 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:28,270 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-27 09:12:28,290 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:28,291 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 11 [2018-10-27 09:12:28,291 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:28,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 09:12:28,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 09:12:28,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2018-10-27 09:12:28,292 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 11 states. [2018-10-27 09:12:28,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:28,446 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-10-27 09:12:28,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 09:12:28,447 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 36 [2018-10-27 09:12:28,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:28,448 INFO L225 Difference]: With dead ends: 49 [2018-10-27 09:12:28,449 INFO L226 Difference]: Without dead ends: 47 [2018-10-27 09:12:28,450 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 7 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-10-27 09:12:28,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-10-27 09:12:28,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-10-27 09:12:28,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-27 09:12:28,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2018-10-27 09:12:28,457 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 36 [2018-10-27 09:12:28,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:28,457 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2018-10-27 09:12:28,458 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 09:12:28,458 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2018-10-27 09:12:28,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-27 09:12:28,459 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:28,459 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:28,459 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:28,459 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:28,460 INFO L82 PathProgramCache]: Analyzing trace with hash 959019949, now seen corresponding path program 5 times [2018-10-27 09:12:28,460 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:28,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:28,461 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:28,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:28,461 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:28,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:28,586 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-27 09:12:28,586 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:28,587 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:28,587 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:28,587 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:28,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:28,587 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 [2018-10-27 09:12:28,596 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:12:28,597 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:12:28,616 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-27 09:12:28,616 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:12:28,621 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:28,631 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-27 09:12:28,631 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:28,746 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-27 09:12:28,768 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:28,768 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 11 [2018-10-27 09:12:28,769 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:28,769 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 09:12:28,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 09:12:28,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2018-10-27 09:12:28,770 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 11 states. [2018-10-27 09:12:28,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:28,929 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2018-10-27 09:12:28,930 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 09:12:28,930 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 44 [2018-10-27 09:12:28,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:28,931 INFO L225 Difference]: With dead ends: 74 [2018-10-27 09:12:28,932 INFO L226 Difference]: Without dead ends: 49 [2018-10-27 09:12:28,932 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 81 SyntacticMatches, 8 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2018-10-27 09:12:28,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-27 09:12:28,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-10-27 09:12:28,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-10-27 09:12:28,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2018-10-27 09:12:28,940 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 44 [2018-10-27 09:12:28,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:28,940 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2018-10-27 09:12:28,941 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 09:12:28,941 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2018-10-27 09:12:28,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-27 09:12:28,942 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:28,942 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:28,943 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:28,943 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:28,943 INFO L82 PathProgramCache]: Analyzing trace with hash 1636294695, now seen corresponding path program 6 times [2018-10-27 09:12:28,943 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:28,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:28,944 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:12:28,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:28,944 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:28,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:29,096 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 25 proven. 28 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-27 09:12:29,096 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:29,096 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:29,097 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:29,097 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:29,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:29,097 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 [2018-10-27 09:12:29,104 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:12:29,104 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:12:29,122 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:12:29,122 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:12:29,125 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:29,193 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-27 09:12:29,193 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:29,283 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-27 09:12:29,303 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:29,303 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 12 [2018-10-27 09:12:29,303 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:29,304 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 09:12:29,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 09:12:29,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2018-10-27 09:12:29,305 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 12 states. [2018-10-27 09:12:29,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:29,543 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2018-10-27 09:12:29,543 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 09:12:29,543 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 46 [2018-10-27 09:12:29,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:29,545 INFO L225 Difference]: With dead ends: 59 [2018-10-27 09:12:29,545 INFO L226 Difference]: Without dead ends: 57 [2018-10-27 09:12:29,546 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 87 SyntacticMatches, 9 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2018-10-27 09:12:29,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-27 09:12:29,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-10-27 09:12:29,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-27 09:12:29,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-10-27 09:12:29,553 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 46 [2018-10-27 09:12:29,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:29,554 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-10-27 09:12:29,554 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 09:12:29,554 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-10-27 09:12:29,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-10-27 09:12:29,555 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:29,555 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:29,555 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:29,556 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:29,556 INFO L82 PathProgramCache]: Analyzing trace with hash -2134957206, now seen corresponding path program 7 times [2018-10-27 09:12:29,556 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:29,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:29,557 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:12:29,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:29,557 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:29,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:29,695 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-27 09:12:29,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:29,696 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:29,696 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:29,696 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:29,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:29,696 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 [2018-10-27 09:12:29,704 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:29,705 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:12:29,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:29,733 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:29,755 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-27 09:12:29,755 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:29,885 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-27 09:12:29,905 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:29,905 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 13 [2018-10-27 09:12:29,905 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:29,906 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 09:12:29,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 09:12:29,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2018-10-27 09:12:29,907 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 13 states. [2018-10-27 09:12:30,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:30,091 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2018-10-27 09:12:30,091 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 09:12:30,091 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 54 [2018-10-27 09:12:30,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:30,092 INFO L225 Difference]: With dead ends: 88 [2018-10-27 09:12:30,092 INFO L226 Difference]: Without dead ends: 59 [2018-10-27 09:12:30,093 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 99 SyntacticMatches, 10 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=97, Invalid=245, Unknown=0, NotChecked=0, Total=342 [2018-10-27 09:12:30,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-10-27 09:12:30,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-10-27 09:12:30,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-27 09:12:30,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2018-10-27 09:12:30,102 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 54 [2018-10-27 09:12:30,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:30,103 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2018-10-27 09:12:30,103 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 09:12:30,103 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2018-10-27 09:12:30,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-27 09:12:30,104 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:30,104 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:30,104 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:30,104 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:30,105 INFO L82 PathProgramCache]: Analyzing trace with hash -1771194524, now seen corresponding path program 8 times [2018-10-27 09:12:30,105 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:30,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:30,106 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:30,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:30,106 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:30,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:30,246 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 37 proven. 46 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 09:12:30,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:30,247 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:30,247 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:30,247 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:30,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:30,248 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 09:12:30,259 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:12:30,259 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:12:30,281 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 09:12:30,281 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:12:30,286 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:30,661 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-27 09:12:30,662 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:30,780 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-27 09:12:30,801 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:30,801 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 13 [2018-10-27 09:12:30,801 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:30,801 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 09:12:30,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 09:12:30,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-10-27 09:12:30,802 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand 13 states. [2018-10-27 09:12:30,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:30,938 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-10-27 09:12:30,939 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-27 09:12:30,939 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 56 [2018-10-27 09:12:30,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:30,941 INFO L225 Difference]: With dead ends: 69 [2018-10-27 09:12:30,941 INFO L226 Difference]: Without dead ends: 67 [2018-10-27 09:12:30,942 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 106 SyntacticMatches, 11 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2018-10-27 09:12:30,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-27 09:12:30,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-10-27 09:12:30,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-10-27 09:12:30,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2018-10-27 09:12:30,950 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 56 [2018-10-27 09:12:30,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:30,951 INFO L481 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2018-10-27 09:12:30,951 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 09:12:30,951 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2018-10-27 09:12:30,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-27 09:12:30,954 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:30,954 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:30,954 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:30,954 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:30,955 INFO L82 PathProgramCache]: Analyzing trace with hash -835949145, now seen corresponding path program 9 times [2018-10-27 09:12:30,955 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:30,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:30,956 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:12:30,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:30,956 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:30,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:31,276 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-27 09:12:31,276 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:31,276 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:31,277 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:31,277 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:31,277 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:31,277 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 [2018-10-27 09:12:31,285 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:12:31,285 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:12:31,306 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:12:31,306 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:12:31,309 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:31,324 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-27 09:12:31,324 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:31,603 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-27 09:12:31,623 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:31,624 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 15 [2018-10-27 09:12:31,624 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:31,624 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 09:12:31,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 09:12:31,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2018-10-27 09:12:31,625 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 15 states. [2018-10-27 09:12:32,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:32,022 INFO L93 Difference]: Finished difference Result 102 states and 109 transitions. [2018-10-27 09:12:32,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 09:12:32,022 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 64 [2018-10-27 09:12:32,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:32,024 INFO L225 Difference]: With dead ends: 102 [2018-10-27 09:12:32,024 INFO L226 Difference]: Without dead ends: 69 [2018-10-27 09:12:32,025 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 117 SyntacticMatches, 12 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=127, Invalid=335, Unknown=0, NotChecked=0, Total=462 [2018-10-27 09:12:32,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-27 09:12:32,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-10-27 09:12:32,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-27 09:12:32,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-10-27 09:12:32,033 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 64 [2018-10-27 09:12:32,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:32,034 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-10-27 09:12:32,034 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 09:12:32,034 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-10-27 09:12:32,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-10-27 09:12:32,035 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:32,036 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:32,036 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:32,036 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:32,036 INFO L82 PathProgramCache]: Analyzing trace with hash -598355679, now seen corresponding path program 10 times [2018-10-27 09:12:32,037 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:32,037 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:32,038 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:12:32,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:32,038 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:32,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:32,201 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 51 proven. 68 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-27 09:12:32,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:32,202 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:32,202 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:32,202 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:32,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:32,202 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 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 [2018-10-27 09:12:32,211 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:32,211 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:12:32,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:32,234 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:32,294 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-27 09:12:32,295 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:32,479 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-27 09:12:32,500 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:32,500 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 14 [2018-10-27 09:12:32,500 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:32,500 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 09:12:32,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 09:12:32,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2018-10-27 09:12:32,501 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 14 states. [2018-10-27 09:12:32,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:32,835 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-10-27 09:12:32,835 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 09:12:32,836 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 66 [2018-10-27 09:12:32,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:32,837 INFO L225 Difference]: With dead ends: 79 [2018-10-27 09:12:32,837 INFO L226 Difference]: Without dead ends: 77 [2018-10-27 09:12:32,838 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 125 SyntacticMatches, 13 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2018-10-27 09:12:32,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-10-27 09:12:32,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2018-10-27 09:12:32,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-27 09:12:32,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2018-10-27 09:12:32,845 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 66 [2018-10-27 09:12:32,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:32,846 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2018-10-27 09:12:32,846 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 09:12:32,846 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2018-10-27 09:12:32,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-27 09:12:32,847 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:32,847 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:32,847 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:32,848 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:32,848 INFO L82 PathProgramCache]: Analyzing trace with hash -781092252, now seen corresponding path program 11 times [2018-10-27 09:12:32,848 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:32,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:32,849 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:32,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:32,849 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:32,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:33,405 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-27 09:12:33,405 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:33,405 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:33,405 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:33,405 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:33,405 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:33,405 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 [2018-10-27 09:12:33,412 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:12:33,413 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:12:33,492 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-27 09:12:33,492 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:12:33,494 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:33,507 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-27 09:12:33,507 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:33,800 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-27 09:12:33,821 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:33,821 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 17 [2018-10-27 09:12:33,821 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:33,821 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 09:12:33,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 09:12:33,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2018-10-27 09:12:33,822 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand 17 states. [2018-10-27 09:12:34,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:34,255 INFO L93 Difference]: Finished difference Result 116 states and 124 transitions. [2018-10-27 09:12:34,255 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 09:12:34,255 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 74 [2018-10-27 09:12:34,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:34,256 INFO L225 Difference]: With dead ends: 116 [2018-10-27 09:12:34,256 INFO L226 Difference]: Without dead ends: 79 [2018-10-27 09:12:34,257 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 135 SyntacticMatches, 14 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=161, Invalid=439, Unknown=0, NotChecked=0, Total=600 [2018-10-27 09:12:34,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-27 09:12:34,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-10-27 09:12:34,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-27 09:12:34,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-10-27 09:12:34,267 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2018-10-27 09:12:34,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:34,268 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-10-27 09:12:34,271 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 09:12:34,271 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-10-27 09:12:34,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-27 09:12:34,272 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:34,272 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:34,272 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:34,272 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:34,273 INFO L82 PathProgramCache]: Analyzing trace with hash 1719160158, now seen corresponding path program 12 times [2018-10-27 09:12:34,273 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:34,274 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:34,274 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:12:34,274 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:34,274 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:34,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:34,474 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 67 proven. 94 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-27 09:12:34,474 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:34,474 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:34,475 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:34,475 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:34,475 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:34,475 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 [2018-10-27 09:12:34,482 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:12:34,483 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:12:34,522 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:12:34,522 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:12:34,525 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:34,679 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-27 09:12:34,679 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:34,837 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-27 09:12:34,862 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:34,862 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 15 [2018-10-27 09:12:34,863 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:34,863 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 09:12:34,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 09:12:34,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2018-10-27 09:12:34,864 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 15 states. [2018-10-27 09:12:34,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:34,999 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2018-10-27 09:12:35,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 09:12:35,000 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 76 [2018-10-27 09:12:35,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:35,001 INFO L225 Difference]: With dead ends: 89 [2018-10-27 09:12:35,002 INFO L226 Difference]: Without dead ends: 87 [2018-10-27 09:12:35,002 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 144 SyntacticMatches, 15 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2018-10-27 09:12:35,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-27 09:12:35,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-10-27 09:12:35,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-27 09:12:35,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-10-27 09:12:35,008 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 76 [2018-10-27 09:12:35,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:35,009 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-10-27 09:12:35,009 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 09:12:35,009 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-10-27 09:12:35,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-10-27 09:12:35,010 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:35,010 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:35,010 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:35,010 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:35,011 INFO L82 PathProgramCache]: Analyzing trace with hash -1817810527, now seen corresponding path program 13 times [2018-10-27 09:12:35,011 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:35,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:35,012 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:12:35,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:35,012 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:35,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:35,266 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-27 09:12:35,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:35,267 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:35,267 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:35,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:35,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:35,267 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 [2018-10-27 09:12:35,275 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:35,275 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:12:35,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:35,299 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:35,310 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-27 09:12:35,311 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:35,525 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-27 09:12:35,546 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:35,547 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 19 [2018-10-27 09:12:35,547 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:35,547 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 09:12:35,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 09:12:35,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2018-10-27 09:12:35,548 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 19 states. [2018-10-27 09:12:35,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:35,846 INFO L93 Difference]: Finished difference Result 130 states and 139 transitions. [2018-10-27 09:12:35,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 09:12:35,852 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 84 [2018-10-27 09:12:35,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:35,853 INFO L225 Difference]: With dead ends: 130 [2018-10-27 09:12:35,854 INFO L226 Difference]: Without dead ends: 89 [2018-10-27 09:12:35,856 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 153 SyntacticMatches, 16 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=199, Invalid=557, Unknown=0, NotChecked=0, Total=756 [2018-10-27 09:12:35,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-10-27 09:12:35,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2018-10-27 09:12:35,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-27 09:12:35,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 90 transitions. [2018-10-27 09:12:35,864 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 90 transitions. Word has length 84 [2018-10-27 09:12:35,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:35,864 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 90 transitions. [2018-10-27 09:12:35,865 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 09:12:35,865 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 90 transitions. [2018-10-27 09:12:35,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-10-27 09:12:35,866 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:35,866 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:35,866 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:35,867 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:35,867 INFO L82 PathProgramCache]: Analyzing trace with hash 455429147, now seen corresponding path program 14 times [2018-10-27 09:12:35,867 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:35,868 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:35,868 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:35,868 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:35,868 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:35,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:36,148 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 85 proven. 124 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-27 09:12:36,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:36,148 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:36,148 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:36,149 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:36,149 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:36,149 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 [2018-10-27 09:12:36,162 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:12:36,162 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:12:36,195 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 09:12:36,195 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:12:36,198 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:36,247 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-27 09:12:36,248 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:36,398 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-27 09:12:36,419 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:36,419 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 16 [2018-10-27 09:12:36,419 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:36,419 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 09:12:36,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 09:12:36,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2018-10-27 09:12:36,420 INFO L87 Difference]: Start difference. First operand 89 states and 90 transitions. Second operand 16 states. [2018-10-27 09:12:36,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:36,595 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-10-27 09:12:36,596 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 09:12:36,596 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 86 [2018-10-27 09:12:36,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:36,597 INFO L225 Difference]: With dead ends: 99 [2018-10-27 09:12:36,597 INFO L226 Difference]: Without dead ends: 97 [2018-10-27 09:12:36,598 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 163 SyntacticMatches, 17 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2018-10-27 09:12:36,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-27 09:12:36,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-10-27 09:12:36,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-27 09:12:36,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-10-27 09:12:36,604 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 86 [2018-10-27 09:12:36,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:36,604 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-10-27 09:12:36,605 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 09:12:36,605 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-10-27 09:12:36,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-10-27 09:12:36,606 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:36,606 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:36,607 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:36,607 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:36,607 INFO L82 PathProgramCache]: Analyzing trace with hash 955997022, now seen corresponding path program 15 times [2018-10-27 09:12:36,607 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:36,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:36,608 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:12:36,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:36,608 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:36,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:36,829 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-27 09:12:36,830 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:36,830 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:36,830 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:36,830 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:36,830 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:36,830 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 [2018-10-27 09:12:36,838 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:12:36,838 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:12:36,867 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:12:36,867 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:12:36,869 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:36,883 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-27 09:12:36,884 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:37,032 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-27 09:12:37,052 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:37,053 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 21 [2018-10-27 09:12:37,053 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:37,053 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 09:12:37,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 09:12:37,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2018-10-27 09:12:37,054 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 21 states. [2018-10-27 09:12:37,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:37,508 INFO L93 Difference]: Finished difference Result 144 states and 154 transitions. [2018-10-27 09:12:37,516 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 09:12:37,516 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 94 [2018-10-27 09:12:37,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:37,517 INFO L225 Difference]: With dead ends: 144 [2018-10-27 09:12:37,517 INFO L226 Difference]: Without dead ends: 99 [2018-10-27 09:12:37,518 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 171 SyntacticMatches, 18 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=241, Invalid=689, Unknown=0, NotChecked=0, Total=930 [2018-10-27 09:12:37,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-27 09:12:37,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-10-27 09:12:37,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-27 09:12:37,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2018-10-27 09:12:37,527 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 94 [2018-10-27 09:12:37,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:37,528 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2018-10-27 09:12:37,528 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 09:12:37,529 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2018-10-27 09:12:37,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-27 09:12:37,530 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:37,530 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:37,530 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:37,530 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:37,531 INFO L82 PathProgramCache]: Analyzing trace with hash -708514472, now seen corresponding path program 16 times [2018-10-27 09:12:37,531 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:37,531 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:37,532 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:12:37,532 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:37,532 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:37,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:38,279 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 105 proven. 158 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-27 09:12:38,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:38,280 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:38,280 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:38,280 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:38,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:38,280 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 [2018-10-27 09:12:38,288 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:38,288 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:12:38,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:38,322 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:38,376 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-27 09:12:38,376 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:38,531 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-27 09:12:38,551 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:38,552 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 17 [2018-10-27 09:12:38,552 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:38,552 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 09:12:38,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 09:12:38,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=194, Unknown=0, NotChecked=0, Total=272 [2018-10-27 09:12:38,553 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand 17 states. [2018-10-27 09:12:38,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:38,803 INFO L93 Difference]: Finished difference Result 109 states and 110 transitions. [2018-10-27 09:12:38,804 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 09:12:38,804 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 96 [2018-10-27 09:12:38,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:38,806 INFO L225 Difference]: With dead ends: 109 [2018-10-27 09:12:38,806 INFO L226 Difference]: Without dead ends: 107 [2018-10-27 09:12:38,806 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 182 SyntacticMatches, 19 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2018-10-27 09:12:38,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2018-10-27 09:12:38,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2018-10-27 09:12:38,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-10-27 09:12:38,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2018-10-27 09:12:38,812 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 96 [2018-10-27 09:12:38,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:38,813 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2018-10-27 09:12:38,813 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 09:12:38,813 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2018-10-27 09:12:38,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-27 09:12:38,814 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:38,814 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:38,814 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:38,814 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:38,815 INFO L82 PathProgramCache]: Analyzing trace with hash 1119383451, now seen corresponding path program 17 times [2018-10-27 09:12:38,815 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:38,816 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:38,816 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:38,816 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:38,816 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:38,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:40,666 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-27 09:12:40,666 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:40,666 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:40,666 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:40,666 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:40,666 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:40,666 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 [2018-10-27 09:12:40,673 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:12:40,674 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:12:40,734 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-27 09:12:40,734 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:12:40,736 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:40,753 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-27 09:12:40,753 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:40,963 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-27 09:12:40,983 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:40,983 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 23 [2018-10-27 09:12:40,983 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:40,984 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 09:12:40,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 09:12:40,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=373, Unknown=0, NotChecked=0, Total=506 [2018-10-27 09:12:40,984 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand 23 states. [2018-10-27 09:12:41,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:41,413 INFO L93 Difference]: Finished difference Result 158 states and 169 transitions. [2018-10-27 09:12:41,413 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 09:12:41,413 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 104 [2018-10-27 09:12:41,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:41,414 INFO L225 Difference]: With dead ends: 158 [2018-10-27 09:12:41,414 INFO L226 Difference]: Without dead ends: 109 [2018-10-27 09:12:41,415 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 189 SyntacticMatches, 20 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=287, Invalid=835, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 09:12:41,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-10-27 09:12:41,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2018-10-27 09:12:41,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2018-10-27 09:12:41,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2018-10-27 09:12:41,423 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 104 [2018-10-27 09:12:41,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:41,423 INFO L481 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2018-10-27 09:12:41,423 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 09:12:41,423 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2018-10-27 09:12:41,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2018-10-27 09:12:41,424 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:41,424 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:41,424 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:41,424 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:41,425 INFO L82 PathProgramCache]: Analyzing trace with hash 685199637, now seen corresponding path program 18 times [2018-10-27 09:12:41,425 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:41,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:41,426 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:12:41,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:41,426 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:41,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:41,612 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 127 proven. 196 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-27 09:12:41,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:41,612 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:41,612 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:41,612 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:41,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:41,612 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 [2018-10-27 09:12:41,620 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:12:41,621 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:12:41,653 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:12:41,653 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:12:41,655 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:41,718 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-27 09:12:41,719 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:41,896 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-27 09:12:41,916 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:41,916 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 18 [2018-10-27 09:12:41,916 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:41,917 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 09:12:41,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 09:12:41,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2018-10-27 09:12:41,918 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand 18 states. [2018-10-27 09:12:42,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:42,117 INFO L93 Difference]: Finished difference Result 119 states and 120 transitions. [2018-10-27 09:12:42,117 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 09:12:42,117 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 106 [2018-10-27 09:12:42,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:42,119 INFO L225 Difference]: With dead ends: 119 [2018-10-27 09:12:42,119 INFO L226 Difference]: Without dead ends: 117 [2018-10-27 09:12:42,120 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 201 SyntacticMatches, 21 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2018-10-27 09:12:42,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-27 09:12:42,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2018-10-27 09:12:42,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-27 09:12:42,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 118 transitions. [2018-10-27 09:12:42,126 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 118 transitions. Word has length 106 [2018-10-27 09:12:42,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:42,127 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 118 transitions. [2018-10-27 09:12:42,127 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 09:12:42,127 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 118 transitions. [2018-10-27 09:12:42,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-10-27 09:12:42,128 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:42,128 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:42,128 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:42,128 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:42,129 INFO L82 PathProgramCache]: Analyzing trace with hash 1363002968, now seen corresponding path program 19 times [2018-10-27 09:12:42,129 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:42,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:42,129 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:12:42,130 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:42,130 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:42,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:42,728 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-27 09:12:42,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:42,728 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:42,729 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:42,729 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:42,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:42,729 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 [2018-10-27 09:12:42,737 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:42,737 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:12:42,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:42,773 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:42,788 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-27 09:12:42,788 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:42,996 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-27 09:12:43,016 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:43,016 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 25 [2018-10-27 09:12:43,017 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:43,017 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-27 09:12:43,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-27 09:12:43,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=443, Unknown=0, NotChecked=0, Total=600 [2018-10-27 09:12:43,018 INFO L87 Difference]: Start difference. First operand 117 states and 118 transitions. Second operand 25 states. [2018-10-27 09:12:43,703 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-27 09:12:43,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:43,995 INFO L93 Difference]: Finished difference Result 172 states and 184 transitions. [2018-10-27 09:12:43,997 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 09:12:43,997 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 114 [2018-10-27 09:12:43,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:43,998 INFO L225 Difference]: With dead ends: 172 [2018-10-27 09:12:43,998 INFO L226 Difference]: Without dead ends: 119 [2018-10-27 09:12:43,999 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 207 SyntacticMatches, 22 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=337, Invalid=995, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 09:12:43,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2018-10-27 09:12:44,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2018-10-27 09:12:44,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-10-27 09:12:44,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 120 transitions. [2018-10-27 09:12:44,007 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 120 transitions. Word has length 114 [2018-10-27 09:12:44,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:44,007 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 120 transitions. [2018-10-27 09:12:44,007 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-27 09:12:44,007 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 120 transitions. [2018-10-27 09:12:44,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-27 09:12:44,008 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:44,008 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:44,009 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:44,009 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:44,009 INFO L82 PathProgramCache]: Analyzing trace with hash -1611360430, now seen corresponding path program 20 times [2018-10-27 09:12:44,009 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:44,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:44,010 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:44,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:44,010 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:44,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:44,327 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 151 proven. 238 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-27 09:12:44,327 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:44,327 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:44,327 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:44,328 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:44,328 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:44,328 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 [2018-10-27 09:12:44,337 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:12:44,337 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:12:44,407 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 09:12:44,407 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:12:44,409 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:44,471 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-27 09:12:44,471 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:44,640 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-27 09:12:44,661 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:44,661 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 19 [2018-10-27 09:12:44,661 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:44,661 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 09:12:44,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 09:12:44,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=239, Unknown=0, NotChecked=0, Total=342 [2018-10-27 09:12:44,662 INFO L87 Difference]: Start difference. First operand 119 states and 120 transitions. Second operand 19 states. [2018-10-27 09:12:44,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:44,825 INFO L93 Difference]: Finished difference Result 129 states and 130 transitions. [2018-10-27 09:12:44,826 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 09:12:44,826 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 116 [2018-10-27 09:12:44,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:44,827 INFO L225 Difference]: With dead ends: 129 [2018-10-27 09:12:44,828 INFO L226 Difference]: Without dead ends: 127 [2018-10-27 09:12:44,828 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 220 SyntacticMatches, 23 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=116, Invalid=304, Unknown=0, NotChecked=0, Total=420 [2018-10-27 09:12:44,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-27 09:12:44,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2018-10-27 09:12:44,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-10-27 09:12:44,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2018-10-27 09:12:44,834 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 116 [2018-10-27 09:12:44,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:44,835 INFO L481 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2018-10-27 09:12:44,835 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 09:12:44,835 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2018-10-27 09:12:44,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2018-10-27 09:12:44,836 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:44,836 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:44,836 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:44,837 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:44,837 INFO L82 PathProgramCache]: Analyzing trace with hash 1711505301, now seen corresponding path program 21 times [2018-10-27 09:12:44,837 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:44,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:44,838 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:12:44,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:44,838 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:44,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:45,277 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-27 09:12:45,278 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:45,278 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:45,278 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:45,278 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:45,278 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:45,279 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 [2018-10-27 09:12:45,292 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:12:45,293 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:12:45,350 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:12:45,350 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:12:45,354 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:45,390 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-27 09:12:45,390 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:45,942 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-27 09:12:45,962 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:45,962 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 27 [2018-10-27 09:12:45,962 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:45,963 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 09:12:45,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 09:12:45,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=519, Unknown=0, NotChecked=0, Total=702 [2018-10-27 09:12:45,964 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand 27 states. [2018-10-27 09:12:46,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:46,467 INFO L93 Difference]: Finished difference Result 186 states and 199 transitions. [2018-10-27 09:12:46,476 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-27 09:12:46,476 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 124 [2018-10-27 09:12:46,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:46,477 INFO L225 Difference]: With dead ends: 186 [2018-10-27 09:12:46,477 INFO L226 Difference]: Without dead ends: 129 [2018-10-27 09:12:46,479 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 225 SyntacticMatches, 24 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 473 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=391, Invalid=1169, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 09:12:46,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-10-27 09:12:46,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2018-10-27 09:12:46,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-27 09:12:46,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 130 transitions. [2018-10-27 09:12:46,488 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 130 transitions. Word has length 124 [2018-10-27 09:12:46,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:46,488 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 130 transitions. [2018-10-27 09:12:46,488 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 09:12:46,488 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 130 transitions. [2018-10-27 09:12:46,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2018-10-27 09:12:46,491 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:46,491 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:46,491 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:46,491 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:46,492 INFO L82 PathProgramCache]: Analyzing trace with hash -2117279729, now seen corresponding path program 22 times [2018-10-27 09:12:46,492 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:46,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:46,492 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:12:46,493 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:46,493 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:46,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:46,828 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 177 proven. 284 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-27 09:12:46,828 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:46,828 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:46,828 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:46,829 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:46,829 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:46,829 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 [2018-10-27 09:12:46,836 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:46,836 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:12:46,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:46,875 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:47,197 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 178 proven. 253 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-27 09:12:47,197 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:47,364 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 178 proven. 253 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-27 09:12:47,384 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:47,384 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 20 [2018-10-27 09:12:47,384 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:47,385 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 09:12:47,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 09:12:47,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=263, Unknown=0, NotChecked=0, Total=380 [2018-10-27 09:12:47,385 INFO L87 Difference]: Start difference. First operand 129 states and 130 transitions. Second operand 20 states. [2018-10-27 09:12:47,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:47,730 INFO L93 Difference]: Finished difference Result 139 states and 140 transitions. [2018-10-27 09:12:47,730 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 09:12:47,730 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 126 [2018-10-27 09:12:47,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:47,732 INFO L225 Difference]: With dead ends: 139 [2018-10-27 09:12:47,732 INFO L226 Difference]: Without dead ends: 137 [2018-10-27 09:12:47,733 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 239 SyntacticMatches, 25 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=130, Invalid=332, Unknown=0, NotChecked=0, Total=462 [2018-10-27 09:12:47,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2018-10-27 09:12:47,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2018-10-27 09:12:47,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2018-10-27 09:12:47,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 138 transitions. [2018-10-27 09:12:47,742 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 138 transitions. Word has length 126 [2018-10-27 09:12:47,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:47,742 INFO L481 AbstractCegarLoop]: Abstraction has 137 states and 138 transitions. [2018-10-27 09:12:47,742 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 09:12:47,742 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 138 transitions. [2018-10-27 09:12:47,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-27 09:12:47,743 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:47,743 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:47,744 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:47,744 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:47,744 INFO L82 PathProgramCache]: Analyzing trace with hash -1516651694, now seen corresponding path program 23 times [2018-10-27 09:12:47,744 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:47,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:47,745 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:47,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:47,745 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:47,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:48,758 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-27 09:12:48,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:48,759 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:48,759 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:48,759 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:48,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:48,759 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 [2018-10-27 09:12:48,766 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:12:48,766 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:12:48,816 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-10-27 09:12:48,816 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:12:48,820 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:48,842 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-27 09:12:48,842 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:49,586 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-27 09:12:49,606 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:49,606 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 29 [2018-10-27 09:12:49,606 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:49,606 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-27 09:12:49,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-27 09:12:49,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=601, Unknown=0, NotChecked=0, Total=812 [2018-10-27 09:12:49,607 INFO L87 Difference]: Start difference. First operand 137 states and 138 transitions. Second operand 29 states. [2018-10-27 09:12:50,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:50,220 INFO L93 Difference]: Finished difference Result 200 states and 214 transitions. [2018-10-27 09:12:50,227 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 09:12:50,227 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 134 [2018-10-27 09:12:50,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:50,228 INFO L225 Difference]: With dead ends: 200 [2018-10-27 09:12:50,228 INFO L226 Difference]: Without dead ends: 139 [2018-10-27 09:12:50,229 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 243 SyntacticMatches, 26 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 558 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=449, Invalid=1357, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 09:12:50,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-27 09:12:50,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2018-10-27 09:12:50,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-10-27 09:12:50,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2018-10-27 09:12:50,237 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 134 [2018-10-27 09:12:50,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:50,237 INFO L481 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2018-10-27 09:12:50,237 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-27 09:12:50,237 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2018-10-27 09:12:50,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2018-10-27 09:12:50,238 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:50,238 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:50,238 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:50,239 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:50,239 INFO L82 PathProgramCache]: Analyzing trace with hash 304630604, now seen corresponding path program 24 times [2018-10-27 09:12:50,239 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:50,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:50,239 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:12:50,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:50,240 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:50,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:50,647 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 205 proven. 334 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-27 09:12:50,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:50,647 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:50,647 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:50,647 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:50,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:50,648 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 [2018-10-27 09:12:50,656 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:12:50,657 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:12:50,697 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:12:50,697 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:12:50,701 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:50,750 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 206 proven. 300 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-27 09:12:50,750 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:51,001 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 206 proven. 300 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-27 09:12:51,021 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:51,022 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 21 [2018-10-27 09:12:51,022 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:51,022 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 09:12:51,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 09:12:51,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=288, Unknown=0, NotChecked=0, Total=420 [2018-10-27 09:12:51,023 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand 21 states. [2018-10-27 09:12:51,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:51,252 INFO L93 Difference]: Finished difference Result 149 states and 150 transitions. [2018-10-27 09:12:51,253 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 09:12:51,253 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 136 [2018-10-27 09:12:51,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:51,255 INFO L225 Difference]: With dead ends: 149 [2018-10-27 09:12:51,255 INFO L226 Difference]: Without dead ends: 147 [2018-10-27 09:12:51,256 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 258 SyntacticMatches, 27 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=145, Invalid=361, Unknown=0, NotChecked=0, Total=506 [2018-10-27 09:12:51,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-10-27 09:12:51,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2018-10-27 09:12:51,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-10-27 09:12:51,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 148 transitions. [2018-10-27 09:12:51,263 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 148 transitions. Word has length 136 [2018-10-27 09:12:51,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:51,264 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 148 transitions. [2018-10-27 09:12:51,264 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 09:12:51,264 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 148 transitions. [2018-10-27 09:12:51,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2018-10-27 09:12:51,265 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:51,265 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:51,265 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:51,266 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:51,266 INFO L82 PathProgramCache]: Analyzing trace with hash -1717003889, now seen corresponding path program 25 times [2018-10-27 09:12:51,266 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:51,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:51,267 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:12:51,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:51,267 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:51,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:51,684 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-27 09:12:51,684 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:51,685 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:51,685 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:51,685 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:51,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:51,685 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 [2018-10-27 09:12:51,692 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:51,692 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:12:51,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:51,732 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:51,755 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-27 09:12:51,755 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:52,081 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-27 09:12:52,102 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:52,102 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 31 [2018-10-27 09:12:52,102 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:52,103 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-27 09:12:52,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-27 09:12:52,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=689, Unknown=0, NotChecked=0, Total=930 [2018-10-27 09:12:52,103 INFO L87 Difference]: Start difference. First operand 147 states and 148 transitions. Second operand 31 states. [2018-10-27 09:12:53,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:53,866 INFO L93 Difference]: Finished difference Result 214 states and 229 transitions. [2018-10-27 09:12:53,867 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 09:12:53,867 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 144 [2018-10-27 09:12:53,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:53,868 INFO L225 Difference]: With dead ends: 214 [2018-10-27 09:12:53,868 INFO L226 Difference]: Without dead ends: 149 [2018-10-27 09:12:53,869 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 261 SyntacticMatches, 28 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 650 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=511, Invalid=1559, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 09:12:53,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-10-27 09:12:53,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2018-10-27 09:12:53,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-10-27 09:12:53,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 150 transitions. [2018-10-27 09:12:53,877 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 150 transitions. Word has length 144 [2018-10-27 09:12:53,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:53,877 INFO L481 AbstractCegarLoop]: Abstraction has 149 states and 150 transitions. [2018-10-27 09:12:53,877 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-27 09:12:53,877 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 150 transitions. [2018-10-27 09:12:53,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-10-27 09:12:53,878 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:53,879 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:53,879 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:53,879 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:53,879 INFO L82 PathProgramCache]: Analyzing trace with hash 1407645961, now seen corresponding path program 26 times [2018-10-27 09:12:53,879 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:53,880 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:53,880 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:53,880 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:53,880 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:53,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:54,216 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 235 proven. 388 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-27 09:12:54,216 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:54,216 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:54,216 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:54,216 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:54,216 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:54,217 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 [2018-10-27 09:12:54,223 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:12:54,223 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:12:54,337 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-27 09:12:54,337 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:12:54,340 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:54,826 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 236 proven. 351 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-27 09:12:54,826 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:55,040 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 236 proven. 351 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-27 09:12:55,060 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:55,060 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 22 [2018-10-27 09:12:55,060 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:55,060 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 09:12:55,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 09:12:55,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=314, Unknown=0, NotChecked=0, Total=462 [2018-10-27 09:12:55,061 INFO L87 Difference]: Start difference. First operand 149 states and 150 transitions. Second operand 22 states. [2018-10-27 09:12:55,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:55,284 INFO L93 Difference]: Finished difference Result 159 states and 160 transitions. [2018-10-27 09:12:55,285 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 09:12:55,285 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 146 [2018-10-27 09:12:55,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:55,287 INFO L225 Difference]: With dead ends: 159 [2018-10-27 09:12:55,287 INFO L226 Difference]: Without dead ends: 157 [2018-10-27 09:12:55,287 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 277 SyntacticMatches, 29 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=161, Invalid=391, Unknown=0, NotChecked=0, Total=552 [2018-10-27 09:12:55,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-27 09:12:55,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2018-10-27 09:12:55,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-10-27 09:12:55,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 158 transitions. [2018-10-27 09:12:55,295 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 158 transitions. Word has length 146 [2018-10-27 09:12:55,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:55,295 INFO L481 AbstractCegarLoop]: Abstraction has 157 states and 158 transitions. [2018-10-27 09:12:55,295 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 09:12:55,296 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 158 transitions. [2018-10-27 09:12:55,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2018-10-27 09:12:55,296 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:55,297 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:55,297 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:55,297 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:55,297 INFO L82 PathProgramCache]: Analyzing trace with hash -219137460, now seen corresponding path program 27 times [2018-10-27 09:12:55,297 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:55,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:55,298 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:12:55,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:55,298 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:55,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:56,884 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-27 09:12:56,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:56,884 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:56,884 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:56,885 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:56,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:56,885 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:12:56,894 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:12:56,895 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:12:56,941 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:12:56,941 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:12:56,945 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:56,973 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-27 09:12:56,973 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:57,657 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-27 09:12:57,678 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:57,678 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 33 [2018-10-27 09:12:57,678 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:57,678 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 09:12:57,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 09:12:57,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=783, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 09:12:57,679 INFO L87 Difference]: Start difference. First operand 157 states and 158 transitions. Second operand 33 states. [2018-10-27 09:12:58,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:12:58,678 INFO L93 Difference]: Finished difference Result 228 states and 244 transitions. [2018-10-27 09:12:58,684 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-27 09:12:58,684 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 154 [2018-10-27 09:12:58,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:12:58,685 INFO L225 Difference]: With dead ends: 228 [2018-10-27 09:12:58,685 INFO L226 Difference]: Without dead ends: 159 [2018-10-27 09:12:58,687 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 279 SyntacticMatches, 30 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 749 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=577, Invalid=1775, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 09:12:58,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2018-10-27 09:12:58,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2018-10-27 09:12:58,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-10-27 09:12:58,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2018-10-27 09:12:58,695 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 154 [2018-10-27 09:12:58,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:12:58,696 INFO L481 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2018-10-27 09:12:58,696 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 09:12:58,696 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2018-10-27 09:12:58,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-10-27 09:12:58,697 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:12:58,697 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:12:58,697 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:12:58,697 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:12:58,698 INFO L82 PathProgramCache]: Analyzing trace with hash 1258359110, now seen corresponding path program 28 times [2018-10-27 09:12:58,698 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:12:58,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:58,698 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:12:58,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:12:58,699 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:12:58,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:59,028 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 267 proven. 446 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-27 09:12:59,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:59,028 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:12:59,028 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:12:59,028 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:12:59,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:12:59,029 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 [2018-10-27 09:12:59,036 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:12:59,037 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:12:59,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:12:59,097 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:12:59,211 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 268 proven. 406 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-27 09:12:59,212 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:12:59,504 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 268 proven. 406 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-27 09:12:59,524 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:12:59,524 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 23 [2018-10-27 09:12:59,524 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:12:59,525 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 09:12:59,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 09:12:59,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=341, Unknown=0, NotChecked=0, Total=506 [2018-10-27 09:12:59,525 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand 23 states. [2018-10-27 09:13:00,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:00,150 INFO L93 Difference]: Finished difference Result 169 states and 170 transitions. [2018-10-27 09:13:00,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 09:13:00,151 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 156 [2018-10-27 09:13:00,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:00,153 INFO L225 Difference]: With dead ends: 169 [2018-10-27 09:13:00,153 INFO L226 Difference]: Without dead ends: 167 [2018-10-27 09:13:00,154 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 296 SyntacticMatches, 31 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=178, Invalid=422, Unknown=0, NotChecked=0, Total=600 [2018-10-27 09:13:00,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2018-10-27 09:13:00,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 167. [2018-10-27 09:13:00,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-27 09:13:00,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 168 transitions. [2018-10-27 09:13:00,161 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 168 transitions. Word has length 156 [2018-10-27 09:13:00,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:00,162 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 168 transitions. [2018-10-27 09:13:00,162 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 09:13:00,162 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 168 transitions. [2018-10-27 09:13:00,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-10-27 09:13:00,163 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:00,163 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:00,163 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:00,164 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:00,164 INFO L82 PathProgramCache]: Analyzing trace with hash -884425335, now seen corresponding path program 29 times [2018-10-27 09:13:00,164 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:00,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:00,165 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:00,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:00,165 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:00,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:00,731 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-27 09:13:00,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:00,731 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:00,731 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:00,732 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:00,732 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:00,732 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 [2018-10-27 09:13:00,739 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:13:00,739 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:13:00,980 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-27 09:13:00,980 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:00,984 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:01,014 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-27 09:13:01,015 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:01,421 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-27 09:13:01,441 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:01,441 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 35 [2018-10-27 09:13:01,441 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:01,442 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-27 09:13:01,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-27 09:13:01,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=883, Unknown=0, NotChecked=0, Total=1190 [2018-10-27 09:13:01,443 INFO L87 Difference]: Start difference. First operand 167 states and 168 transitions. Second operand 35 states. [2018-10-27 09:13:02,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:02,414 INFO L93 Difference]: Finished difference Result 242 states and 259 transitions. [2018-10-27 09:13:02,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-27 09:13:02,421 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 164 [2018-10-27 09:13:02,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:02,422 INFO L225 Difference]: With dead ends: 242 [2018-10-27 09:13:02,422 INFO L226 Difference]: Without dead ends: 169 [2018-10-27 09:13:02,426 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 297 SyntacticMatches, 32 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 855 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=647, Invalid=2005, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 09:13:02,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-27 09:13:02,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-10-27 09:13:02,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-10-27 09:13:02,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-10-27 09:13:02,435 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 164 [2018-10-27 09:13:02,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:02,436 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-10-27 09:13:02,436 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-27 09:13:02,436 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-10-27 09:13:02,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2018-10-27 09:13:02,440 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:02,440 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:02,440 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:02,440 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:02,440 INFO L82 PathProgramCache]: Analyzing trace with hash -1098474493, now seen corresponding path program 30 times [2018-10-27 09:13:02,440 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:02,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:02,441 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:02,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:02,441 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:02,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:02,702 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 301 proven. 508 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-27 09:13:02,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:02,702 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:02,703 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:02,703 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:02,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:02,703 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 [2018-10-27 09:13:02,716 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:13:02,716 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:13:02,766 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:13:02,766 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:02,770 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:03,425 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 302 proven. 465 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-27 09:13:03,426 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:04,101 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 302 proven. 465 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-27 09:13:04,122 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:04,122 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 24 [2018-10-27 09:13:04,122 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:04,123 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 09:13:04,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 09:13:04,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=369, Unknown=0, NotChecked=0, Total=552 [2018-10-27 09:13:04,124 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 24 states. [2018-10-27 09:13:04,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:04,398 INFO L93 Difference]: Finished difference Result 179 states and 180 transitions. [2018-10-27 09:13:04,398 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 09:13:04,398 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 166 [2018-10-27 09:13:04,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:04,401 INFO L225 Difference]: With dead ends: 179 [2018-10-27 09:13:04,401 INFO L226 Difference]: Without dead ends: 177 [2018-10-27 09:13:04,402 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 315 SyntacticMatches, 33 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 388 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=196, Invalid=454, Unknown=0, NotChecked=0, Total=650 [2018-10-27 09:13:04,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-10-27 09:13:04,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2018-10-27 09:13:04,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-27 09:13:04,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 178 transitions. [2018-10-27 09:13:04,410 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 178 transitions. Word has length 166 [2018-10-27 09:13:04,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:04,411 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 178 transitions. [2018-10-27 09:13:04,411 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 09:13:04,411 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 178 transitions. [2018-10-27 09:13:04,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-10-27 09:13:04,412 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:04,412 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:04,412 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:04,413 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:04,413 INFO L82 PathProgramCache]: Analyzing trace with hash 1738687302, now seen corresponding path program 31 times [2018-10-27 09:13:04,413 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:04,413 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:04,414 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:04,414 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:04,414 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:04,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:05,437 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-27 09:13:05,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:05,437 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:05,438 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:05,438 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:05,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:05,438 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 [2018-10-27 09:13:05,445 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:05,445 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:13:05,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:05,506 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:05,543 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-27 09:13:05,543 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:06,024 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-27 09:13:06,044 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:06,044 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 37 [2018-10-27 09:13:06,044 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:06,044 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-27 09:13:06,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-27 09:13:06,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=343, Invalid=989, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 09:13:06,045 INFO L87 Difference]: Start difference. First operand 177 states and 178 transitions. Second operand 37 states. [2018-10-27 09:13:06,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:06,743 INFO L93 Difference]: Finished difference Result 256 states and 274 transitions. [2018-10-27 09:13:06,745 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-27 09:13:06,745 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 174 [2018-10-27 09:13:06,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:06,748 INFO L225 Difference]: With dead ends: 256 [2018-10-27 09:13:06,748 INFO L226 Difference]: Without dead ends: 179 [2018-10-27 09:13:06,750 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 315 SyntacticMatches, 34 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 968 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=721, Invalid=2249, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 09:13:06,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2018-10-27 09:13:06,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2018-10-27 09:13:06,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2018-10-27 09:13:06,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 180 transitions. [2018-10-27 09:13:06,759 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 180 transitions. Word has length 174 [2018-10-27 09:13:06,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:06,759 INFO L481 AbstractCegarLoop]: Abstraction has 179 states and 180 transitions. [2018-10-27 09:13:06,760 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-27 09:13:06,760 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 180 transitions. [2018-10-27 09:13:06,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-27 09:13:06,761 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:06,761 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:06,761 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:06,761 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:06,761 INFO L82 PathProgramCache]: Analyzing trace with hash 2057294144, now seen corresponding path program 32 times [2018-10-27 09:13:06,762 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:06,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:06,762 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:06,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:06,762 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:06,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:07,261 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 337 proven. 574 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-27 09:13:07,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:07,261 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:07,261 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:07,262 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:07,262 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:07,262 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 [2018-10-27 09:13:07,269 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:13:07,269 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:13:07,333 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-27 09:13:07,333 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:07,337 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:07,426 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 338 proven. 528 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-27 09:13:07,426 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:07,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 338 proven. 528 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-27 09:13:07,807 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:07,807 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 25 [2018-10-27 09:13:07,807 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:07,807 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-27 09:13:07,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-27 09:13:07,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=398, Unknown=0, NotChecked=0, Total=600 [2018-10-27 09:13:07,808 INFO L87 Difference]: Start difference. First operand 179 states and 180 transitions. Second operand 25 states. [2018-10-27 09:13:08,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:08,618 INFO L93 Difference]: Finished difference Result 189 states and 190 transitions. [2018-10-27 09:13:08,619 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-27 09:13:08,619 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 176 [2018-10-27 09:13:08,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:08,621 INFO L225 Difference]: With dead ends: 189 [2018-10-27 09:13:08,621 INFO L226 Difference]: Without dead ends: 187 [2018-10-27 09:13:08,621 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 334 SyntacticMatches, 35 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 429 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=215, Invalid=487, Unknown=0, NotChecked=0, Total=702 [2018-10-27 09:13:08,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-27 09:13:08,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-10-27 09:13:08,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-10-27 09:13:08,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2018-10-27 09:13:08,630 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 176 [2018-10-27 09:13:08,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:08,631 INFO L481 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2018-10-27 09:13:08,631 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-27 09:13:08,631 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2018-10-27 09:13:08,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2018-10-27 09:13:08,632 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:08,632 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:08,632 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:08,633 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:08,633 INFO L82 PathProgramCache]: Analyzing trace with hash 2047142787, now seen corresponding path program 33 times [2018-10-27 09:13:08,633 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:08,633 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:08,634 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:08,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:08,634 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:08,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:09,237 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-27 09:13:09,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:09,237 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:09,238 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:09,238 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:09,238 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:09,238 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 [2018-10-27 09:13:09,246 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:13:09,246 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:13:09,303 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:13:09,303 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:09,307 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:09,340 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-27 09:13:09,341 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:10,036 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-27 09:13:10,055 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:10,056 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 39 [2018-10-27 09:13:10,056 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:10,056 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 09:13:10,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 09:13:10,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=381, Invalid=1101, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 09:13:10,057 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand 39 states. [2018-10-27 09:13:11,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:11,149 INFO L93 Difference]: Finished difference Result 270 states and 289 transitions. [2018-10-27 09:13:11,149 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-27 09:13:11,150 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 184 [2018-10-27 09:13:11,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:11,151 INFO L225 Difference]: With dead ends: 270 [2018-10-27 09:13:11,151 INFO L226 Difference]: Without dead ends: 189 [2018-10-27 09:13:11,153 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 333 SyntacticMatches, 36 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1088 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=799, Invalid=2507, Unknown=0, NotChecked=0, Total=3306 [2018-10-27 09:13:11,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2018-10-27 09:13:11,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 189. [2018-10-27 09:13:11,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-10-27 09:13:11,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 190 transitions. [2018-10-27 09:13:11,162 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 190 transitions. Word has length 184 [2018-10-27 09:13:11,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:11,162 INFO L481 AbstractCegarLoop]: Abstraction has 189 states and 190 transitions. [2018-10-27 09:13:11,162 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 09:13:11,162 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 190 transitions. [2018-10-27 09:13:11,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-27 09:13:11,163 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:11,164 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:11,164 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:11,164 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:11,164 INFO L82 PathProgramCache]: Analyzing trace with hash 311216381, now seen corresponding path program 34 times [2018-10-27 09:13:11,165 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:11,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:11,165 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:11,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:11,166 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:11,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:11,590 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 375 proven. 644 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-27 09:13:11,590 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:11,590 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:11,590 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:11,590 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:11,591 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:11,591 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 [2018-10-27 09:13:11,597 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:11,597 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:13:11,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:11,654 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:11,837 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 376 proven. 595 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-27 09:13:11,837 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:12,151 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 376 proven. 595 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-27 09:13:12,172 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:12,172 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 26 [2018-10-27 09:13:12,172 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:12,173 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-27 09:13:12,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-27 09:13:12,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=428, Unknown=0, NotChecked=0, Total=650 [2018-10-27 09:13:12,174 INFO L87 Difference]: Start difference. First operand 189 states and 190 transitions. Second operand 26 states. [2018-10-27 09:13:12,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:12,450 INFO L93 Difference]: Finished difference Result 199 states and 200 transitions. [2018-10-27 09:13:12,450 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 09:13:12,451 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 186 [2018-10-27 09:13:12,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:12,452 INFO L225 Difference]: With dead ends: 199 [2018-10-27 09:13:12,453 INFO L226 Difference]: Without dead ends: 197 [2018-10-27 09:13:12,453 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 353 SyntacticMatches, 37 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=235, Invalid=521, Unknown=0, NotChecked=0, Total=756 [2018-10-27 09:13:12,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-10-27 09:13:12,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 197. [2018-10-27 09:13:12,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2018-10-27 09:13:12,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 198 transitions. [2018-10-27 09:13:12,461 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 198 transitions. Word has length 186 [2018-10-27 09:13:12,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:12,462 INFO L481 AbstractCegarLoop]: Abstraction has 197 states and 198 transitions. [2018-10-27 09:13:12,462 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-27 09:13:12,462 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 198 transitions. [2018-10-27 09:13:12,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-10-27 09:13:12,463 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:12,463 INFO L375 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 19, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:12,463 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:12,464 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:12,464 INFO L82 PathProgramCache]: Analyzing trace with hash -477047232, now seen corresponding path program 35 times [2018-10-27 09:13:12,464 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:12,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:12,465 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:12,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:12,465 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:12,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:13,507 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-27 09:13:13,507 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:13,507 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:13,508 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:13,508 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:13,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:13,508 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 [2018-10-27 09:13:13,515 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:13:13,516 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:13:13,587 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-10-27 09:13:13,587 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:13,593 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:13,630 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-27 09:13:13,630 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:14,130 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-27 09:13:14,150 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:14,150 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 41 [2018-10-27 09:13:14,150 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:14,151 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-27 09:13:14,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-27 09:13:14,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=421, Invalid=1219, Unknown=0, NotChecked=0, Total=1640 [2018-10-27 09:13:14,152 INFO L87 Difference]: Start difference. First operand 197 states and 198 transitions. Second operand 41 states. [2018-10-27 09:13:15,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:15,211 INFO L93 Difference]: Finished difference Result 284 states and 304 transitions. [2018-10-27 09:13:15,211 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-27 09:13:15,211 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 194 [2018-10-27 09:13:15,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:15,213 INFO L225 Difference]: With dead ends: 284 [2018-10-27 09:13:15,213 INFO L226 Difference]: Without dead ends: 199 [2018-10-27 09:13:15,214 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 351 SyntacticMatches, 38 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1215 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=881, Invalid=2779, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 09:13:15,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-27 09:13:15,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199. [2018-10-27 09:13:15,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-10-27 09:13:15,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 200 transitions. [2018-10-27 09:13:15,224 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 200 transitions. Word has length 194 [2018-10-27 09:13:15,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:15,224 INFO L481 AbstractCegarLoop]: Abstraction has 199 states and 200 transitions. [2018-10-27 09:13:15,225 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-27 09:13:15,225 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 200 transitions. [2018-10-27 09:13:15,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2018-10-27 09:13:15,226 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:15,226 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:15,226 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:15,226 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:15,227 INFO L82 PathProgramCache]: Analyzing trace with hash 581280570, now seen corresponding path program 36 times [2018-10-27 09:13:15,227 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:15,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:15,227 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:15,228 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:15,228 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:15,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:16,116 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 415 proven. 718 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-27 09:13:16,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:16,117 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:16,117 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:16,117 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:16,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:16,117 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 [2018-10-27 09:13:16,125 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:13:16,125 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:13:16,177 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:13:16,177 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:16,181 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:16,273 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 416 proven. 666 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-27 09:13:16,274 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:16,636 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 416 proven. 666 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-27 09:13:16,656 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:16,656 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 27 [2018-10-27 09:13:16,656 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:16,657 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 09:13:16,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 09:13:16,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=459, Unknown=0, NotChecked=0, Total=702 [2018-10-27 09:13:16,658 INFO L87 Difference]: Start difference. First operand 199 states and 200 transitions. Second operand 27 states. [2018-10-27 09:13:16,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:16,908 INFO L93 Difference]: Finished difference Result 209 states and 210 transitions. [2018-10-27 09:13:16,908 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 09:13:16,908 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 196 [2018-10-27 09:13:16,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:16,911 INFO L225 Difference]: With dead ends: 209 [2018-10-27 09:13:16,911 INFO L226 Difference]: Without dead ends: 207 [2018-10-27 09:13:16,912 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 372 SyntacticMatches, 39 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=256, Invalid=556, Unknown=0, NotChecked=0, Total=812 [2018-10-27 09:13:16,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-10-27 09:13:16,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2018-10-27 09:13:16,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-10-27 09:13:16,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 208 transitions. [2018-10-27 09:13:16,921 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 208 transitions. Word has length 196 [2018-10-27 09:13:16,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:16,921 INFO L481 AbstractCegarLoop]: Abstraction has 207 states and 208 transitions. [2018-10-27 09:13:16,921 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 09:13:16,921 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 208 transitions. [2018-10-27 09:13:16,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-10-27 09:13:16,922 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:16,923 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:16,923 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:16,923 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:16,923 INFO L82 PathProgramCache]: Analyzing trace with hash -159505539, now seen corresponding path program 37 times [2018-10-27 09:13:16,923 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:16,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:16,924 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:16,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:16,924 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:16,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:17,772 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-27 09:13:17,772 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:17,772 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:17,772 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:17,772 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:17,772 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:17,772 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 [2018-10-27 09:13:17,780 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:17,780 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:13:17,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:17,842 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:17,883 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-27 09:13:17,883 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:18,759 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-27 09:13:18,779 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:18,779 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 43 [2018-10-27 09:13:18,779 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:18,780 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-27 09:13:18,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-27 09:13:18,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1343, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 09:13:18,781 INFO L87 Difference]: Start difference. First operand 207 states and 208 transitions. Second operand 43 states. [2018-10-27 09:13:20,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:20,022 INFO L93 Difference]: Finished difference Result 298 states and 319 transitions. [2018-10-27 09:13:20,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-27 09:13:20,023 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 204 [2018-10-27 09:13:20,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:20,024 INFO L225 Difference]: With dead ends: 298 [2018-10-27 09:13:20,024 INFO L226 Difference]: Without dead ends: 209 [2018-10-27 09:13:20,026 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 369 SyntacticMatches, 40 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1349 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=967, Invalid=3065, Unknown=0, NotChecked=0, Total=4032 [2018-10-27 09:13:20,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2018-10-27 09:13:20,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 209. [2018-10-27 09:13:20,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2018-10-27 09:13:20,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 210 transitions. [2018-10-27 09:13:20,036 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 210 transitions. Word has length 204 [2018-10-27 09:13:20,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:20,037 INFO L481 AbstractCegarLoop]: Abstraction has 209 states and 210 transitions. [2018-10-27 09:13:20,037 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-27 09:13:20,037 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 210 transitions. [2018-10-27 09:13:20,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-10-27 09:13:20,038 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:20,038 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:20,038 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:20,039 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:20,039 INFO L82 PathProgramCache]: Analyzing trace with hash 307920887, now seen corresponding path program 38 times [2018-10-27 09:13:20,039 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:20,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:20,039 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:20,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:20,040 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:20,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:20,405 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 457 proven. 796 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-27 09:13:20,405 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:20,405 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:20,405 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:20,405 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:20,405 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:20,405 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 [2018-10-27 09:13:20,414 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:13:20,414 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:13:20,525 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-27 09:13:20,525 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:20,530 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:20,936 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 458 proven. 741 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-27 09:13:20,936 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:21,340 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 458 proven. 741 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-27 09:13:21,361 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:21,361 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 28 [2018-10-27 09:13:21,361 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:21,361 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-27 09:13:21,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-27 09:13:21,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=491, Unknown=0, NotChecked=0, Total=756 [2018-10-27 09:13:21,362 INFO L87 Difference]: Start difference. First operand 209 states and 210 transitions. Second operand 28 states. [2018-10-27 09:13:21,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:21,630 INFO L93 Difference]: Finished difference Result 219 states and 220 transitions. [2018-10-27 09:13:21,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-27 09:13:21,630 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 206 [2018-10-27 09:13:21,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:21,632 INFO L225 Difference]: With dead ends: 219 [2018-10-27 09:13:21,633 INFO L226 Difference]: Without dead ends: 217 [2018-10-27 09:13:21,633 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 391 SyntacticMatches, 41 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 564 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=278, Invalid=592, Unknown=0, NotChecked=0, Total=870 [2018-10-27 09:13:21,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2018-10-27 09:13:21,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 217. [2018-10-27 09:13:21,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2018-10-27 09:13:21,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 218 transitions. [2018-10-27 09:13:21,644 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 218 transitions. Word has length 206 [2018-10-27 09:13:21,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:21,644 INFO L481 AbstractCegarLoop]: Abstraction has 217 states and 218 transitions. [2018-10-27 09:13:21,644 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-27 09:13:21,644 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 218 transitions. [2018-10-27 09:13:21,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2018-10-27 09:13:21,646 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:21,646 INFO L375 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 21, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:21,646 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:21,646 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:21,647 INFO L82 PathProgramCache]: Analyzing trace with hash 941421370, now seen corresponding path program 39 times [2018-10-27 09:13:21,647 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:21,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:21,647 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:21,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:21,648 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:21,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:24,428 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-27 09:13:24,428 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:24,428 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:24,428 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:24,429 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:24,429 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:24,429 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:24,436 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:13:24,436 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:13:24,499 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:13:24,499 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:24,503 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:24,545 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-27 09:13:24,545 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:25,218 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-27 09:13:25,249 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:25,249 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 45 [2018-10-27 09:13:25,249 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:25,250 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-27 09:13:25,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-27 09:13:25,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=507, Invalid=1473, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 09:13:25,251 INFO L87 Difference]: Start difference. First operand 217 states and 218 transitions. Second operand 45 states. [2018-10-27 09:13:26,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:26,703 INFO L93 Difference]: Finished difference Result 312 states and 334 transitions. [2018-10-27 09:13:26,704 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-27 09:13:26,704 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 214 [2018-10-27 09:13:26,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:26,705 INFO L225 Difference]: With dead ends: 312 [2018-10-27 09:13:26,705 INFO L226 Difference]: Without dead ends: 219 [2018-10-27 09:13:26,706 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 387 SyntacticMatches, 42 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1490 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1057, Invalid=3365, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 09:13:26,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-10-27 09:13:26,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2018-10-27 09:13:26,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2018-10-27 09:13:26,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 220 transitions. [2018-10-27 09:13:26,717 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 220 transitions. Word has length 214 [2018-10-27 09:13:26,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:26,717 INFO L481 AbstractCegarLoop]: Abstraction has 219 states and 220 transitions. [2018-10-27 09:13:26,717 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-27 09:13:26,717 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 220 transitions. [2018-10-27 09:13:26,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2018-10-27 09:13:26,718 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:26,719 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:26,719 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:26,719 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:26,719 INFO L82 PathProgramCache]: Analyzing trace with hash 1446215476, now seen corresponding path program 40 times [2018-10-27 09:13:26,719 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:26,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:26,720 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:26,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:26,720 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:26,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:28,453 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 501 proven. 878 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2018-10-27 09:13:28,454 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:28,454 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:28,454 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:28,454 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:28,454 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:28,455 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:28,461 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:28,462 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:13:28,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:28,524 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:28,692 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 502 proven. 820 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-27 09:13:28,692 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:29,204 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 502 proven. 820 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-27 09:13:29,225 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:29,225 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 29 [2018-10-27 09:13:29,225 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:29,225 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-27 09:13:29,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-27 09:13:29,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=524, Unknown=0, NotChecked=0, Total=812 [2018-10-27 09:13:29,226 INFO L87 Difference]: Start difference. First operand 219 states and 220 transitions. Second operand 29 states. [2018-10-27 09:13:29,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:29,781 INFO L93 Difference]: Finished difference Result 229 states and 230 transitions. [2018-10-27 09:13:29,781 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 09:13:29,781 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 216 [2018-10-27 09:13:29,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:29,784 INFO L225 Difference]: With dead ends: 229 [2018-10-27 09:13:29,784 INFO L226 Difference]: Without dead ends: 227 [2018-10-27 09:13:29,784 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 410 SyntacticMatches, 43 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 613 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=301, Invalid=629, Unknown=0, NotChecked=0, Total=930 [2018-10-27 09:13:29,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2018-10-27 09:13:29,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 227. [2018-10-27 09:13:29,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 227 states. [2018-10-27 09:13:29,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 228 transitions. [2018-10-27 09:13:29,795 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 228 transitions. Word has length 216 [2018-10-27 09:13:29,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:29,795 INFO L481 AbstractCegarLoop]: Abstraction has 227 states and 228 transitions. [2018-10-27 09:13:29,795 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-27 09:13:29,795 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 228 transitions. [2018-10-27 09:13:29,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2018-10-27 09:13:29,797 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:29,797 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:29,797 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:29,797 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:29,797 INFO L82 PathProgramCache]: Analyzing trace with hash -1563073161, now seen corresponding path program 41 times [2018-10-27 09:13:29,797 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:29,798 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:29,798 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:29,798 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:29,798 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:29,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:31,357 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-27 09:13:31,357 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:31,357 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:31,358 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:31,358 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:31,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:31,358 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:31,370 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:13:31,370 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:13:31,515 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-10-27 09:13:31,515 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:31,520 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:31,554 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-27 09:13:31,554 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:32,167 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-27 09:13:32,187 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:32,188 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 47 [2018-10-27 09:13:32,188 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:32,188 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-27 09:13:32,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-27 09:13:32,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=553, Invalid=1609, Unknown=0, NotChecked=0, Total=2162 [2018-10-27 09:13:32,189 INFO L87 Difference]: Start difference. First operand 227 states and 228 transitions. Second operand 47 states. [2018-10-27 09:13:33,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:33,993 INFO L93 Difference]: Finished difference Result 326 states and 349 transitions. [2018-10-27 09:13:33,993 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-27 09:13:33,993 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 224 [2018-10-27 09:13:33,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:33,995 INFO L225 Difference]: With dead ends: 326 [2018-10-27 09:13:33,995 INFO L226 Difference]: Without dead ends: 229 [2018-10-27 09:13:33,996 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 405 SyntacticMatches, 44 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1638 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1151, Invalid=3679, Unknown=0, NotChecked=0, Total=4830 [2018-10-27 09:13:33,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2018-10-27 09:13:34,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 229. [2018-10-27 09:13:34,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2018-10-27 09:13:34,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 230 transitions. [2018-10-27 09:13:34,007 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 230 transitions. Word has length 224 [2018-10-27 09:13:34,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:34,008 INFO L481 AbstractCegarLoop]: Abstraction has 229 states and 230 transitions. [2018-10-27 09:13:34,008 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-27 09:13:34,008 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 230 transitions. [2018-10-27 09:13:34,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2018-10-27 09:13:34,009 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:34,010 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:34,010 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:34,010 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:34,010 INFO L82 PathProgramCache]: Analyzing trace with hash 835764465, now seen corresponding path program 42 times [2018-10-27 09:13:34,010 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:34,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:34,011 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:34,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:34,011 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:34,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:34,437 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 547 proven. 964 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-10-27 09:13:34,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:34,437 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:34,437 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:34,437 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:34,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:34,438 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 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:34,447 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:13:34,447 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:13:34,516 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:13:34,516 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:34,520 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:34,611 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 548 proven. 903 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-27 09:13:34,611 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:35,104 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 548 proven. 903 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-27 09:13:35,124 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:35,124 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 30 [2018-10-27 09:13:35,125 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:35,125 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 09:13:35,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 09:13:35,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=558, Unknown=0, NotChecked=0, Total=870 [2018-10-27 09:13:35,126 INFO L87 Difference]: Start difference. First operand 229 states and 230 transitions. Second operand 30 states. [2018-10-27 09:13:35,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:35,419 INFO L93 Difference]: Finished difference Result 239 states and 240 transitions. [2018-10-27 09:13:35,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 09:13:35,420 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 226 [2018-10-27 09:13:35,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:35,422 INFO L225 Difference]: With dead ends: 239 [2018-10-27 09:13:35,422 INFO L226 Difference]: Without dead ends: 237 [2018-10-27 09:13:35,422 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 429 SyntacticMatches, 45 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 664 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=325, Invalid=667, Unknown=0, NotChecked=0, Total=992 [2018-10-27 09:13:35,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2018-10-27 09:13:35,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 237. [2018-10-27 09:13:35,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 237 states. [2018-10-27 09:13:35,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 238 transitions. [2018-10-27 09:13:35,432 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 238 transitions. Word has length 226 [2018-10-27 09:13:35,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:35,433 INFO L481 AbstractCegarLoop]: Abstraction has 237 states and 238 transitions. [2018-10-27 09:13:35,433 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 09:13:35,433 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 238 transitions. [2018-10-27 09:13:35,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2018-10-27 09:13:35,434 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:35,435 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:35,435 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:35,435 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:35,435 INFO L82 PathProgramCache]: Analyzing trace with hash 1747425844, now seen corresponding path program 43 times [2018-10-27 09:13:35,435 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:35,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:35,436 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:35,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:35,436 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:35,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:36,345 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-27 09:13:36,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:36,346 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:36,346 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:36,346 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:36,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:36,346 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:36,373 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:36,373 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:13:36,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:36,443 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:36,493 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-27 09:13:36,493 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:37,198 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-27 09:13:37,218 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:37,219 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 49 [2018-10-27 09:13:37,219 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:37,219 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-27 09:13:37,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-27 09:13:37,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=1751, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 09:13:37,220 INFO L87 Difference]: Start difference. First operand 237 states and 238 transitions. Second operand 49 states. [2018-10-27 09:13:38,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:38,523 INFO L93 Difference]: Finished difference Result 340 states and 364 transitions. [2018-10-27 09:13:38,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-27 09:13:38,524 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 234 [2018-10-27 09:13:38,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:38,525 INFO L225 Difference]: With dead ends: 340 [2018-10-27 09:13:38,525 INFO L226 Difference]: Without dead ends: 239 [2018-10-27 09:13:38,526 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 540 GetRequests, 423 SyntacticMatches, 46 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1793 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1249, Invalid=4007, Unknown=0, NotChecked=0, Total=5256 [2018-10-27 09:13:38,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2018-10-27 09:13:38,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2018-10-27 09:13:38,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2018-10-27 09:13:38,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 240 transitions. [2018-10-27 09:13:38,537 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 240 transitions. Word has length 234 [2018-10-27 09:13:38,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:38,538 INFO L481 AbstractCegarLoop]: Abstraction has 239 states and 240 transitions. [2018-10-27 09:13:38,538 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-27 09:13:38,538 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 240 transitions. [2018-10-27 09:13:38,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2018-10-27 09:13:38,539 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:38,539 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:38,540 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:38,540 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:38,540 INFO L82 PathProgramCache]: Analyzing trace with hash -102079186, now seen corresponding path program 44 times [2018-10-27 09:13:38,540 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:38,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:38,541 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:38,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:38,541 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:38,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:39,212 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 595 proven. 1054 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-27 09:13:39,213 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:39,213 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:39,213 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:39,213 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:39,213 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:39,213 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 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:39,222 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:13:39,222 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:13:39,315 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-27 09:13:39,315 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:39,319 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:40,217 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 596 proven. 990 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-27 09:13:40,218 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:41,654 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 596 proven. 990 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-27 09:13:41,675 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:41,675 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 31 [2018-10-27 09:13:41,675 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:41,676 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-27 09:13:41,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-27 09:13:41,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=593, Unknown=0, NotChecked=0, Total=930 [2018-10-27 09:13:41,677 INFO L87 Difference]: Start difference. First operand 239 states and 240 transitions. Second operand 31 states. [2018-10-27 09:13:42,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:42,033 INFO L93 Difference]: Finished difference Result 249 states and 250 transitions. [2018-10-27 09:13:42,034 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-27 09:13:42,034 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 236 [2018-10-27 09:13:42,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:42,036 INFO L225 Difference]: With dead ends: 249 [2018-10-27 09:13:42,036 INFO L226 Difference]: Without dead ends: 247 [2018-10-27 09:13:42,037 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 448 SyntacticMatches, 47 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 717 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=350, Invalid=706, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 09:13:42,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-10-27 09:13:42,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 247. [2018-10-27 09:13:42,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2018-10-27 09:13:42,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 248 transitions. [2018-10-27 09:13:42,048 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 248 transitions. Word has length 236 [2018-10-27 09:13:42,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:42,048 INFO L481 AbstractCegarLoop]: Abstraction has 247 states and 248 transitions. [2018-10-27 09:13:42,048 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-27 09:13:42,049 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 248 transitions. [2018-10-27 09:13:42,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2018-10-27 09:13:42,050 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:42,050 INFO L375 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:42,050 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:42,051 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:42,051 INFO L82 PathProgramCache]: Analyzing trace with hash 850112881, now seen corresponding path program 45 times [2018-10-27 09:13:42,051 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:42,051 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:42,052 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:42,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:42,052 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:42,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:43,323 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-27 09:13:43,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:43,323 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:43,323 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:43,323 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:43,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:43,323 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 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:43,332 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:13:43,332 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:13:43,407 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:13:43,407 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:43,412 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:43,457 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-27 09:13:43,457 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:44,635 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-27 09:13:44,656 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:44,656 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 51 [2018-10-27 09:13:44,656 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:44,657 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-27 09:13:44,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-27 09:13:44,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=651, Invalid=1899, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 09:13:44,657 INFO L87 Difference]: Start difference. First operand 247 states and 248 transitions. Second operand 51 states. [2018-10-27 09:13:45,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:45,479 INFO L93 Difference]: Finished difference Result 354 states and 379 transitions. [2018-10-27 09:13:45,481 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-27 09:13:45,481 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 244 [2018-10-27 09:13:45,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:45,482 INFO L225 Difference]: With dead ends: 354 [2018-10-27 09:13:45,483 INFO L226 Difference]: Without dead ends: 249 [2018-10-27 09:13:45,484 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 563 GetRequests, 441 SyntacticMatches, 48 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1955 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1351, Invalid=4349, Unknown=0, NotChecked=0, Total=5700 [2018-10-27 09:13:45,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2018-10-27 09:13:45,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 249. [2018-10-27 09:13:45,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 249 states. [2018-10-27 09:13:45,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 250 transitions. [2018-10-27 09:13:45,496 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 250 transitions. Word has length 244 [2018-10-27 09:13:45,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:45,497 INFO L481 AbstractCegarLoop]: Abstraction has 249 states and 250 transitions. [2018-10-27 09:13:45,497 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-27 09:13:45,497 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 250 transitions. [2018-10-27 09:13:45,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2018-10-27 09:13:45,498 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:45,498 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:45,499 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:45,499 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:45,499 INFO L82 PathProgramCache]: Analyzing trace with hash -699364373, now seen corresponding path program 46 times [2018-10-27 09:13:45,499 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:45,500 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:45,500 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:45,500 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:45,500 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:45,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:46,163 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 645 proven. 1148 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2018-10-27 09:13:46,163 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:46,164 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:46,164 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:46,164 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:46,164 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:46,164 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 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:46,171 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:46,171 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:13:46,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:46,241 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:46,355 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 646 proven. 1081 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-27 09:13:46,355 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:46,959 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 646 proven. 1081 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-27 09:13:46,979 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:46,979 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 32 [2018-10-27 09:13:46,980 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:46,980 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-27 09:13:46,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-27 09:13:46,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=629, Unknown=0, NotChecked=0, Total=992 [2018-10-27 09:13:46,981 INFO L87 Difference]: Start difference. First operand 249 states and 250 transitions. Second operand 32 states. [2018-10-27 09:13:47,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:47,360 INFO L93 Difference]: Finished difference Result 259 states and 260 transitions. [2018-10-27 09:13:47,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 09:13:47,361 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 246 [2018-10-27 09:13:47,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:47,363 INFO L225 Difference]: With dead ends: 259 [2018-10-27 09:13:47,363 INFO L226 Difference]: Without dead ends: 257 [2018-10-27 09:13:47,363 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 467 SyntacticMatches, 49 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 772 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=376, Invalid=746, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 09:13:47,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2018-10-27 09:13:47,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 257. [2018-10-27 09:13:47,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 257 states. [2018-10-27 09:13:47,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 258 transitions. [2018-10-27 09:13:47,375 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 258 transitions. Word has length 246 [2018-10-27 09:13:47,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:47,375 INFO L481 AbstractCegarLoop]: Abstraction has 257 states and 258 transitions. [2018-10-27 09:13:47,375 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-27 09:13:47,375 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 258 transitions. [2018-10-27 09:13:47,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2018-10-27 09:13:47,377 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:47,377 INFO L375 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 25, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:47,377 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:47,378 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:47,378 INFO L82 PathProgramCache]: Analyzing trace with hash -401487058, now seen corresponding path program 47 times [2018-10-27 09:13:47,378 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:47,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:47,379 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:47,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:47,379 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:47,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:48,846 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-27 09:13:48,847 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:48,847 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:48,847 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:48,847 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:48,847 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:48,847 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 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:48,858 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:13:48,859 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:13:48,964 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-10-27 09:13:48,964 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:48,969 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:49,011 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-27 09:13:49,012 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:49,965 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-27 09:13:49,986 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:49,987 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 53 [2018-10-27 09:13:49,987 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:49,987 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-27 09:13:49,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-27 09:13:49,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=2053, Unknown=0, NotChecked=0, Total=2756 [2018-10-27 09:13:49,988 INFO L87 Difference]: Start difference. First operand 257 states and 258 transitions. Second operand 53 states. [2018-10-27 09:13:51,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:51,804 INFO L93 Difference]: Finished difference Result 368 states and 394 transitions. [2018-10-27 09:13:51,804 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-27 09:13:51,804 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 254 [2018-10-27 09:13:51,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:51,806 INFO L225 Difference]: With dead ends: 368 [2018-10-27 09:13:51,806 INFO L226 Difference]: Without dead ends: 259 [2018-10-27 09:13:51,807 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 459 SyntacticMatches, 50 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2124 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1457, Invalid=4705, Unknown=0, NotChecked=0, Total=6162 [2018-10-27 09:13:51,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2018-10-27 09:13:51,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 259. [2018-10-27 09:13:51,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-10-27 09:13:51,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 260 transitions. [2018-10-27 09:13:51,819 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 260 transitions. Word has length 254 [2018-10-27 09:13:51,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:51,819 INFO L481 AbstractCegarLoop]: Abstraction has 259 states and 260 transitions. [2018-10-27 09:13:51,819 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-27 09:13:51,819 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 260 transitions. [2018-10-27 09:13:51,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2018-10-27 09:13:51,821 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:51,821 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:51,821 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:51,821 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:51,821 INFO L82 PathProgramCache]: Analyzing trace with hash 65754408, now seen corresponding path program 48 times [2018-10-27 09:13:51,822 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:51,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:51,822 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:51,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:51,823 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:51,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:52,886 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 697 proven. 1246 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2018-10-27 09:13:52,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:52,886 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:52,886 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:52,886 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:52,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:52,887 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 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:52,893 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:13:52,894 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:13:52,971 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:13:52,971 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:52,975 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:53,078 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 698 proven. 1176 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-27 09:13:53,078 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:53,678 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 698 proven. 1176 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-27 09:13:53,698 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:53,699 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 33 [2018-10-27 09:13:53,699 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:53,699 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 09:13:53,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 09:13:53,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=390, Invalid=666, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 09:13:53,700 INFO L87 Difference]: Start difference. First operand 259 states and 260 transitions. Second operand 33 states. [2018-10-27 09:13:54,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:54,095 INFO L93 Difference]: Finished difference Result 269 states and 270 transitions. [2018-10-27 09:13:54,095 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 09:13:54,095 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 256 [2018-10-27 09:13:54,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:54,097 INFO L225 Difference]: With dead ends: 269 [2018-10-27 09:13:54,097 INFO L226 Difference]: Without dead ends: 267 [2018-10-27 09:13:54,097 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 486 SyntacticMatches, 51 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 829 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=403, Invalid=787, Unknown=0, NotChecked=0, Total=1190 [2018-10-27 09:13:54,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2018-10-27 09:13:54,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 267. [2018-10-27 09:13:54,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 267 states. [2018-10-27 09:13:54,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 268 transitions. [2018-10-27 09:13:54,109 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 268 transitions. Word has length 256 [2018-10-27 09:13:54,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:54,110 INFO L481 AbstractCegarLoop]: Abstraction has 267 states and 268 transitions. [2018-10-27 09:13:54,110 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 09:13:54,110 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 268 transitions. [2018-10-27 09:13:54,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2018-10-27 09:13:54,111 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:54,111 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:54,112 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:54,112 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:54,112 INFO L82 PathProgramCache]: Analyzing trace with hash -350091413, now seen corresponding path program 49 times [2018-10-27 09:13:54,112 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:54,113 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:54,113 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:54,113 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:54,113 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:54,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:55,195 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-27 09:13:55,195 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:55,195 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:55,195 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:55,195 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:55,195 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:55,196 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 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:55,203 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:55,203 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:13:55,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:55,282 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:55,326 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-27 09:13:55,326 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:56,310 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-27 09:13:56,330 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:56,330 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 55 [2018-10-27 09:13:56,330 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:56,331 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-27 09:13:56,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-27 09:13:56,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=757, Invalid=2213, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 09:13:56,332 INFO L87 Difference]: Start difference. First operand 267 states and 268 transitions. Second operand 55 states. [2018-10-27 09:13:57,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:57,897 INFO L93 Difference]: Finished difference Result 382 states and 409 transitions. [2018-10-27 09:13:57,897 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-27 09:13:57,897 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 264 [2018-10-27 09:13:57,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:57,898 INFO L225 Difference]: With dead ends: 382 [2018-10-27 09:13:57,899 INFO L226 Difference]: Without dead ends: 269 [2018-10-27 09:13:57,900 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 609 GetRequests, 477 SyntacticMatches, 52 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2300 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1567, Invalid=5075, Unknown=0, NotChecked=0, Total=6642 [2018-10-27 09:13:57,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2018-10-27 09:13:57,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 269. [2018-10-27 09:13:57,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2018-10-27 09:13:57,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 270 transitions. [2018-10-27 09:13:57,913 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 270 transitions. Word has length 264 [2018-10-27 09:13:57,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:57,913 INFO L481 AbstractCegarLoop]: Abstraction has 269 states and 270 transitions. [2018-10-27 09:13:57,913 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-27 09:13:57,913 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 270 transitions. [2018-10-27 09:13:57,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2018-10-27 09:13:57,915 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:57,915 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:57,915 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:57,915 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:57,916 INFO L82 PathProgramCache]: Analyzing trace with hash -1766137627, now seen corresponding path program 50 times [2018-10-27 09:13:57,916 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:57,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:57,917 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:57,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:57,917 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:57,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:58,691 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 751 proven. 1348 refuted. 0 times theorem prover too weak. 1128 trivial. 0 not checked. [2018-10-27 09:13:58,692 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:58,692 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:58,692 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:58,692 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:58,692 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:58,692 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 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:58,701 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:13:58,701 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:13:58,805 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-27 09:13:58,806 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:58,810 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:58,911 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 752 proven. 1275 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-27 09:13:58,911 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:59,866 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 752 proven. 1275 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-27 09:13:59,888 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:59,888 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 34 [2018-10-27 09:13:59,888 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:59,889 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-27 09:13:59,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-27 09:13:59,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=704, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 09:13:59,889 INFO L87 Difference]: Start difference. First operand 269 states and 270 transitions. Second operand 34 states. [2018-10-27 09:14:00,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:00,237 INFO L93 Difference]: Finished difference Result 279 states and 280 transitions. [2018-10-27 09:14:00,237 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-27 09:14:00,238 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 266 [2018-10-27 09:14:00,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:00,239 INFO L225 Difference]: With dead ends: 279 [2018-10-27 09:14:00,240 INFO L226 Difference]: Without dead ends: 277 [2018-10-27 09:14:00,240 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 505 SyntacticMatches, 53 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 888 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=431, Invalid=829, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 09:14:00,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2018-10-27 09:14:00,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 277. [2018-10-27 09:14:00,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2018-10-27 09:14:00,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 278 transitions. [2018-10-27 09:14:00,251 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 278 transitions. Word has length 266 [2018-10-27 09:14:00,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:00,251 INFO L481 AbstractCegarLoop]: Abstraction has 277 states and 278 transitions. [2018-10-27 09:14:00,252 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-27 09:14:00,252 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 278 transitions. [2018-10-27 09:14:00,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2018-10-27 09:14:00,253 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:00,253 INFO L375 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 27, 26, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:00,254 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:00,254 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:00,254 INFO L82 PathProgramCache]: Analyzing trace with hash -574847448, now seen corresponding path program 51 times [2018-10-27 09:14:00,254 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:00,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:00,255 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:14:00,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:00,255 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:00,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:01,298 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-27 09:14:01,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:01,298 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:01,298 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:01,298 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:01,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:01,299 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 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:01,305 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:14:01,305 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:14:01,382 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:14:01,382 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:14:01,389 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:01,457 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-27 09:14:01,457 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:02,634 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-27 09:14:02,654 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:02,655 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 57 [2018-10-27 09:14:02,655 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:02,655 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-27 09:14:02,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-27 09:14:02,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=813, Invalid=2379, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 09:14:02,656 INFO L87 Difference]: Start difference. First operand 277 states and 278 transitions. Second operand 57 states. [2018-10-27 09:14:04,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:04,182 INFO L93 Difference]: Finished difference Result 396 states and 424 transitions. [2018-10-27 09:14:04,182 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-27 09:14:04,182 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 274 [2018-10-27 09:14:04,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:04,183 INFO L225 Difference]: With dead ends: 396 [2018-10-27 09:14:04,183 INFO L226 Difference]: Without dead ends: 279 [2018-10-27 09:14:04,184 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 495 SyntacticMatches, 54 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2483 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1681, Invalid=5459, Unknown=0, NotChecked=0, Total=7140 [2018-10-27 09:14:04,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2018-10-27 09:14:04,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 279. [2018-10-27 09:14:04,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 279 states. [2018-10-27 09:14:04,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 280 transitions. [2018-10-27 09:14:04,197 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 280 transitions. Word has length 274 [2018-10-27 09:14:04,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:04,197 INFO L481 AbstractCegarLoop]: Abstraction has 279 states and 280 transitions. [2018-10-27 09:14:04,197 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-27 09:14:04,198 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 280 transitions. [2018-10-27 09:14:04,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2018-10-27 09:14:04,199 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:04,199 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:04,200 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:04,200 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:04,200 INFO L82 PathProgramCache]: Analyzing trace with hash -1143517406, now seen corresponding path program 52 times [2018-10-27 09:14:04,200 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:04,201 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:04,201 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:14:04,201 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:04,201 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:04,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:04,887 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 807 proven. 1454 refuted. 0 times theorem prover too weak. 1225 trivial. 0 not checked. [2018-10-27 09:14:04,888 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:04,888 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:04,888 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:04,888 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:04,888 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:04,888 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 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:04,897 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:14:04,897 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:14:04,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:04,978 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:05,081 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 808 proven. 1378 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-27 09:14:05,081 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:05,736 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 808 proven. 1378 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-27 09:14:05,757 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:05,757 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 35 [2018-10-27 09:14:05,757 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:05,758 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-27 09:14:05,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-27 09:14:05,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=447, Invalid=743, Unknown=0, NotChecked=0, Total=1190 [2018-10-27 09:14:05,759 INFO L87 Difference]: Start difference. First operand 279 states and 280 transitions. Second operand 35 states. [2018-10-27 09:14:06,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:06,200 INFO L93 Difference]: Finished difference Result 289 states and 290 transitions. [2018-10-27 09:14:06,201 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-27 09:14:06,201 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 276 [2018-10-27 09:14:06,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:06,203 INFO L225 Difference]: With dead ends: 289 [2018-10-27 09:14:06,203 INFO L226 Difference]: Without dead ends: 287 [2018-10-27 09:14:06,204 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 614 GetRequests, 524 SyntacticMatches, 55 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=460, Invalid=872, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 09:14:06,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2018-10-27 09:14:06,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 287. [2018-10-27 09:14:06,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2018-10-27 09:14:06,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 288 transitions. [2018-10-27 09:14:06,215 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 288 transitions. Word has length 276 [2018-10-27 09:14:06,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:06,216 INFO L481 AbstractCegarLoop]: Abstraction has 287 states and 288 transitions. [2018-10-27 09:14:06,216 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-27 09:14:06,216 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 288 transitions. [2018-10-27 09:14:06,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2018-10-27 09:14:06,218 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:06,218 INFO L375 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:06,218 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:06,218 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:06,219 INFO L82 PathProgramCache]: Analyzing trace with hash -489068699, now seen corresponding path program 53 times [2018-10-27 09:14:06,219 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:06,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:06,219 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:14:06,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:06,220 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:06,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:07,701 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-27 09:14:07,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:07,702 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:07,702 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:07,702 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:07,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:07,702 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:07,711 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:14:07,711 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:14:07,819 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-10-27 09:14:07,820 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:14:07,845 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:07,895 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-27 09:14:07,896 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:08,902 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-27 09:14:08,923 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:08,923 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 59 [2018-10-27 09:14:08,923 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:08,923 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-10-27 09:14:08,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-10-27 09:14:08,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=871, Invalid=2551, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 09:14:08,924 INFO L87 Difference]: Start difference. First operand 287 states and 288 transitions. Second operand 59 states. [2018-10-27 09:14:10,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:10,449 INFO L93 Difference]: Finished difference Result 410 states and 439 transitions. [2018-10-27 09:14:10,449 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-27 09:14:10,449 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 284 [2018-10-27 09:14:10,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:10,451 INFO L225 Difference]: With dead ends: 410 [2018-10-27 09:14:10,451 INFO L226 Difference]: Without dead ends: 289 [2018-10-27 09:14:10,452 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 655 GetRequests, 513 SyntacticMatches, 56 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2673 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1799, Invalid=5857, Unknown=0, NotChecked=0, Total=7656 [2018-10-27 09:14:10,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2018-10-27 09:14:10,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2018-10-27 09:14:10,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2018-10-27 09:14:10,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 290 transitions. [2018-10-27 09:14:10,465 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 290 transitions. Word has length 284 [2018-10-27 09:14:10,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:10,466 INFO L481 AbstractCegarLoop]: Abstraction has 289 states and 290 transitions. [2018-10-27 09:14:10,466 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-10-27 09:14:10,466 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 290 transitions. [2018-10-27 09:14:10,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2018-10-27 09:14:10,468 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:10,468 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 28, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:10,468 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:10,468 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:10,468 INFO L82 PathProgramCache]: Analyzing trace with hash 2070986719, now seen corresponding path program 54 times [2018-10-27 09:14:10,469 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:10,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:10,469 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:14:10,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:10,469 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:10,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:11,141 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 865 proven. 1564 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2018-10-27 09:14:11,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:11,142 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:11,142 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:11,142 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:11,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:11,142 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 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:11,151 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:14:11,151 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:14:11,225 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:14:11,225 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:14:11,232 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:11,334 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 866 proven. 1485 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-27 09:14:11,335 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:12,084 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 866 proven. 1485 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-27 09:14:12,104 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:12,104 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 36 [2018-10-27 09:14:12,104 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:12,105 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-27 09:14:12,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-27 09:14:12,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=783, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 09:14:12,105 INFO L87 Difference]: Start difference. First operand 289 states and 290 transitions. Second operand 36 states. [2018-10-27 09:14:12,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:12,502 INFO L93 Difference]: Finished difference Result 299 states and 300 transitions. [2018-10-27 09:14:12,502 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-27 09:14:12,502 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 286 [2018-10-27 09:14:12,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:12,504 INFO L225 Difference]: With dead ends: 299 [2018-10-27 09:14:12,504 INFO L226 Difference]: Without dead ends: 297 [2018-10-27 09:14:12,505 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 636 GetRequests, 543 SyntacticMatches, 57 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1012 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=490, Invalid=916, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 09:14:12,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2018-10-27 09:14:12,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 297. [2018-10-27 09:14:12,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 297 states. [2018-10-27 09:14:12,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 298 transitions. [2018-10-27 09:14:12,515 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 298 transitions. Word has length 286 [2018-10-27 09:14:12,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:12,515 INFO L481 AbstractCegarLoop]: Abstraction has 297 states and 298 transitions. [2018-10-27 09:14:12,516 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-27 09:14:12,516 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 298 transitions. [2018-10-27 09:14:12,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2018-10-27 09:14:12,517 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:12,517 INFO L375 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 29, 28, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:12,518 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:12,518 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:12,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1619577634, now seen corresponding path program 55 times [2018-10-27 09:14:12,518 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:12,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:12,519 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:14:12,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:12,519 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:12,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:13,848 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-27 09:14:13,848 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:13,848 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:13,848 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:13,848 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:13,848 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:13,849 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 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:13,856 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:14:13,856 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:14:13,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:13,943 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:14,016 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-27 09:14:14,017 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:15,438 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-27 09:14:15,459 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:15,459 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 61 [2018-10-27 09:14:15,459 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:15,459 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-27 09:14:15,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-27 09:14:15,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=931, Invalid=2729, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 09:14:15,460 INFO L87 Difference]: Start difference. First operand 297 states and 298 transitions. Second operand 61 states. [2018-10-27 09:14:17,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:17,147 INFO L93 Difference]: Finished difference Result 424 states and 454 transitions. [2018-10-27 09:14:17,148 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-27 09:14:17,148 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 294 [2018-10-27 09:14:17,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:17,149 INFO L225 Difference]: With dead ends: 424 [2018-10-27 09:14:17,149 INFO L226 Difference]: Without dead ends: 299 [2018-10-27 09:14:17,150 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 678 GetRequests, 531 SyntacticMatches, 58 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2870 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1921, Invalid=6269, Unknown=0, NotChecked=0, Total=8190 [2018-10-27 09:14:17,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2018-10-27 09:14:17,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 299. [2018-10-27 09:14:17,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 299 states. [2018-10-27 09:14:17,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 300 transitions. [2018-10-27 09:14:17,162 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 300 transitions. Word has length 294 [2018-10-27 09:14:17,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:17,162 INFO L481 AbstractCegarLoop]: Abstraction has 299 states and 300 transitions. [2018-10-27 09:14:17,162 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-27 09:14:17,163 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 300 transitions. [2018-10-27 09:14:17,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2018-10-27 09:14:17,164 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:17,164 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:17,165 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:17,165 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:17,165 INFO L82 PathProgramCache]: Analyzing trace with hash -87076068, now seen corresponding path program 56 times [2018-10-27 09:14:17,165 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:17,166 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:17,166 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:14:17,166 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:17,166 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:17,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:18,452 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 925 proven. 1678 refuted. 0 times theorem prover too weak. 1431 trivial. 0 not checked. [2018-10-27 09:14:18,452 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:18,452 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:18,452 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:18,452 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:18,453 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:18,453 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 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:18,460 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:14:18,460 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:14:18,583 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-27 09:14:18,583 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:14:18,588 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:18,695 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 926 proven. 1596 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-27 09:14:18,695 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:19,450 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 926 proven. 1596 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-27 09:14:19,470 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:19,471 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 37 [2018-10-27 09:14:19,471 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:19,471 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-27 09:14:19,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-27 09:14:19,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=508, Invalid=824, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 09:14:19,472 INFO L87 Difference]: Start difference. First operand 299 states and 300 transitions. Second operand 37 states. [2018-10-27 09:14:20,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:20,054 INFO L93 Difference]: Finished difference Result 309 states and 310 transitions. [2018-10-27 09:14:20,054 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-27 09:14:20,054 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 296 [2018-10-27 09:14:20,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:20,056 INFO L225 Difference]: With dead ends: 309 [2018-10-27 09:14:20,056 INFO L226 Difference]: Without dead ends: 307 [2018-10-27 09:14:20,057 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 562 SyntacticMatches, 59 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1077 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=521, Invalid=961, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 09:14:20,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2018-10-27 09:14:20,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 307. [2018-10-27 09:14:20,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 307 states. [2018-10-27 09:14:20,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 308 transitions. [2018-10-27 09:14:20,069 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 308 transitions. Word has length 296 [2018-10-27 09:14:20,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:20,070 INFO L481 AbstractCegarLoop]: Abstraction has 307 states and 308 transitions. [2018-10-27 09:14:20,070 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-27 09:14:20,070 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 308 transitions. [2018-10-27 09:14:20,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2018-10-27 09:14:20,071 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:20,072 INFO L375 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:20,072 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:20,072 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:20,072 INFO L82 PathProgramCache]: Analyzing trace with hash 1106432351, now seen corresponding path program 57 times [2018-10-27 09:14:20,072 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:20,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:20,073 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:14:20,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:20,073 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:20,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:21,294 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-27 09:14:21,294 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:21,294 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:21,294 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:21,294 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:21,295 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:21,295 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 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:21,303 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:14:21,303 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:14:21,385 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:14:21,385 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:14:21,390 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:21,447 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-27 09:14:21,447 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:22,516 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-27 09:14:22,537 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:22,537 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 63 [2018-10-27 09:14:22,537 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:22,538 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-27 09:14:22,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-27 09:14:22,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=993, Invalid=2913, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 09:14:22,538 INFO L87 Difference]: Start difference. First operand 307 states and 308 transitions. Second operand 63 states. [2018-10-27 09:14:24,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:24,344 INFO L93 Difference]: Finished difference Result 438 states and 469 transitions. [2018-10-27 09:14:24,344 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-27 09:14:24,345 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 304 [2018-10-27 09:14:24,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:24,346 INFO L225 Difference]: With dead ends: 438 [2018-10-27 09:14:24,346 INFO L226 Difference]: Without dead ends: 309 [2018-10-27 09:14:24,347 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 701 GetRequests, 549 SyntacticMatches, 60 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3074 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2047, Invalid=6695, Unknown=0, NotChecked=0, Total=8742 [2018-10-27 09:14:24,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2018-10-27 09:14:24,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 309. [2018-10-27 09:14:24,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 309 states. [2018-10-27 09:14:24,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 310 transitions. [2018-10-27 09:14:24,361 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 310 transitions. Word has length 304 [2018-10-27 09:14:24,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:24,361 INFO L481 AbstractCegarLoop]: Abstraction has 309 states and 310 transitions. [2018-10-27 09:14:24,361 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-27 09:14:24,362 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 310 transitions. [2018-10-27 09:14:24,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2018-10-27 09:14:24,363 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:24,363 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 30, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:24,364 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:24,364 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:24,364 INFO L82 PathProgramCache]: Analyzing trace with hash 1045637337, now seen corresponding path program 58 times [2018-10-27 09:14:24,364 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:24,365 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:24,365 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:14:24,365 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:24,365 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:24,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:25,381 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 987 proven. 1796 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2018-10-27 09:14:25,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:25,381 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:25,382 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:25,382 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:25,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:25,382 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 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:25,389 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:14:25,390 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:14:25,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:25,480 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:25,593 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 988 proven. 1711 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-27 09:14:25,593 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:26,446 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 988 proven. 1711 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-27 09:14:26,466 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:26,466 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 38 [2018-10-27 09:14:26,466 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:26,466 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-27 09:14:26,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-27 09:14:26,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=866, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 09:14:26,467 INFO L87 Difference]: Start difference. First operand 309 states and 310 transitions. Second operand 38 states. [2018-10-27 09:14:26,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:26,902 INFO L93 Difference]: Finished difference Result 319 states and 320 transitions. [2018-10-27 09:14:26,902 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-27 09:14:26,903 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 306 [2018-10-27 09:14:26,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:26,905 INFO L225 Difference]: With dead ends: 319 [2018-10-27 09:14:26,905 INFO L226 Difference]: Without dead ends: 317 [2018-10-27 09:14:26,905 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 680 GetRequests, 581 SyntacticMatches, 61 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1144 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=553, Invalid=1007, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 09:14:26,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2018-10-27 09:14:26,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 317. [2018-10-27 09:14:26,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 317 states. [2018-10-27 09:14:26,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 318 transitions. [2018-10-27 09:14:26,915 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 318 transitions. Word has length 306 [2018-10-27 09:14:26,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:26,915 INFO L481 AbstractCegarLoop]: Abstraction has 317 states and 318 transitions. [2018-10-27 09:14:26,915 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-27 09:14:26,915 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 318 transitions. [2018-10-27 09:14:26,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2018-10-27 09:14:26,917 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:26,917 INFO L375 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:26,917 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:26,917 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:26,917 INFO L82 PathProgramCache]: Analyzing trace with hash -1185441252, now seen corresponding path program 59 times [2018-10-27 09:14:26,918 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:26,918 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:26,918 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:14:26,918 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:26,918 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:26,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:28,177 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-27 09:14:28,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:28,178 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:28,178 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:28,178 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:28,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:28,178 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 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:28,185 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:14:28,186 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:14:28,311 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2018-10-27 09:14:28,311 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:14:28,317 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:28,380 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-27 09:14:28,380 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:29,559 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-27 09:14:29,580 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:29,580 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 65 [2018-10-27 09:14:29,580 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:29,581 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-10-27 09:14:29,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-10-27 09:14:29,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1057, Invalid=3103, Unknown=0, NotChecked=0, Total=4160 [2018-10-27 09:14:29,581 INFO L87 Difference]: Start difference. First operand 317 states and 318 transitions. Second operand 65 states. [2018-10-27 09:14:31,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:31,077 INFO L93 Difference]: Finished difference Result 452 states and 484 transitions. [2018-10-27 09:14:31,078 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-27 09:14:31,078 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 314 [2018-10-27 09:14:31,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:31,079 INFO L225 Difference]: With dead ends: 452 [2018-10-27 09:14:31,079 INFO L226 Difference]: Without dead ends: 319 [2018-10-27 09:14:31,081 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 724 GetRequests, 567 SyntacticMatches, 62 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3285 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2177, Invalid=7135, Unknown=0, NotChecked=0, Total=9312 [2018-10-27 09:14:31,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2018-10-27 09:14:31,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 319. [2018-10-27 09:14:31,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 319 states. [2018-10-27 09:14:31,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 320 transitions. [2018-10-27 09:14:31,091 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 320 transitions. Word has length 314 [2018-10-27 09:14:31,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:31,091 INFO L481 AbstractCegarLoop]: Abstraction has 319 states and 320 transitions. [2018-10-27 09:14:31,091 INFO L482 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-10-27 09:14:31,091 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 320 transitions. [2018-10-27 09:14:31,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2018-10-27 09:14:31,093 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:31,093 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 31, 31, 31, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:31,093 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:31,093 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:31,093 INFO L82 PathProgramCache]: Analyzing trace with hash 1802789142, now seen corresponding path program 60 times [2018-10-27 09:14:31,094 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:31,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:31,094 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:14:31,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:31,094 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:31,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:31,945 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1051 proven. 1918 refuted. 0 times theorem prover too weak. 1653 trivial. 0 not checked. [2018-10-27 09:14:31,945 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:31,945 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:31,945 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:31,945 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:31,945 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:31,945 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 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:31,953 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:14:31,953 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:14:32,046 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:14:32,046 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:14:32,052 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:32,175 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1052 proven. 1830 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-27 09:14:32,176 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:33,047 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1052 proven. 1830 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-27 09:14:33,067 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:33,068 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 36] total 39 [2018-10-27 09:14:33,068 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:33,068 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 09:14:33,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 09:14:33,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=909, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 09:14:33,069 INFO L87 Difference]: Start difference. First operand 319 states and 320 transitions. Second operand 39 states. [2018-10-27 09:14:33,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:33,521 INFO L93 Difference]: Finished difference Result 329 states and 330 transitions. [2018-10-27 09:14:33,522 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-27 09:14:33,522 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 316 [2018-10-27 09:14:33,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:33,524 INFO L225 Difference]: With dead ends: 329 [2018-10-27 09:14:33,524 INFO L226 Difference]: Without dead ends: 327 [2018-10-27 09:14:33,525 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 702 GetRequests, 600 SyntacticMatches, 63 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1213 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=586, Invalid=1054, Unknown=0, NotChecked=0, Total=1640 [2018-10-27 09:14:33,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2018-10-27 09:14:33,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 327. [2018-10-27 09:14:33,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327 states. [2018-10-27 09:14:33,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 328 transitions. [2018-10-27 09:14:33,538 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 328 transitions. Word has length 316 [2018-10-27 09:14:33,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:33,539 INFO L481 AbstractCegarLoop]: Abstraction has 327 states and 328 transitions. [2018-10-27 09:14:33,539 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 09:14:33,539 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 328 transitions. [2018-10-27 09:14:33,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2018-10-27 09:14:33,541 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:33,541 INFO L375 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:33,541 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:33,541 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:33,542 INFO L82 PathProgramCache]: Analyzing trace with hash -2112928423, now seen corresponding path program 61 times [2018-10-27 09:14:33,542 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:33,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:33,542 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:14:33,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:33,543 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:33,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:34,844 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-27 09:14:34,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:34,845 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:34,845 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:34,845 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:34,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:34,845 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 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:34,852 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:14:34,852 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:14:34,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:34,946 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:35,009 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-27 09:14:35,009 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:36,390 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-27 09:14:36,410 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:36,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 67 [2018-10-27 09:14:36,410 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:36,411 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-27 09:14:36,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-27 09:14:36,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1123, Invalid=3299, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 09:14:36,412 INFO L87 Difference]: Start difference. First operand 327 states and 328 transitions. Second operand 67 states. [2018-10-27 09:14:38,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:38,416 INFO L93 Difference]: Finished difference Result 466 states and 499 transitions. [2018-10-27 09:14:38,416 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-27 09:14:38,416 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 324 [2018-10-27 09:14:38,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:38,417 INFO L225 Difference]: With dead ends: 466 [2018-10-27 09:14:38,417 INFO L226 Difference]: Without dead ends: 329 [2018-10-27 09:14:38,419 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 747 GetRequests, 585 SyntacticMatches, 64 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3503 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2311, Invalid=7589, Unknown=0, NotChecked=0, Total=9900 [2018-10-27 09:14:38,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2018-10-27 09:14:38,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 329. [2018-10-27 09:14:38,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 329 states. [2018-10-27 09:14:38,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 330 transitions. [2018-10-27 09:14:38,430 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 330 transitions. Word has length 324 [2018-10-27 09:14:38,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:38,431 INFO L481 AbstractCegarLoop]: Abstraction has 329 states and 330 transitions. [2018-10-27 09:14:38,431 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-27 09:14:38,431 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 330 transitions. [2018-10-27 09:14:38,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2018-10-27 09:14:38,433 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:38,433 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:38,433 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:38,433 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:38,433 INFO L82 PathProgramCache]: Analyzing trace with hash -1966924845, now seen corresponding path program 62 times [2018-10-27 09:14:38,434 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:38,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:38,434 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:14:38,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:38,435 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:38,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:39,177 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1117 proven. 2044 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2018-10-27 09:14:39,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:39,178 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:39,178 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:39,178 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:39,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:39,178 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 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:39,189 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:14:39,189 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:14:39,330 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-27 09:14:39,330 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:14:39,335 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:39,453 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1118 proven. 1953 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-27 09:14:39,454 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:40,726 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1118 proven. 1953 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-27 09:14:40,746 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:40,747 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 40 [2018-10-27 09:14:40,747 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:40,747 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-27 09:14:40,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-27 09:14:40,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=607, Invalid=953, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 09:14:40,748 INFO L87 Difference]: Start difference. First operand 329 states and 330 transitions. Second operand 40 states. [2018-10-27 09:14:41,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:41,183 INFO L93 Difference]: Finished difference Result 339 states and 340 transitions. [2018-10-27 09:14:41,184 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-27 09:14:41,184 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 326 [2018-10-27 09:14:41,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:41,186 INFO L225 Difference]: With dead ends: 339 [2018-10-27 09:14:41,187 INFO L226 Difference]: Without dead ends: 337 [2018-10-27 09:14:41,187 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 724 GetRequests, 619 SyntacticMatches, 65 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1284 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=620, Invalid=1102, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 09:14:41,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2018-10-27 09:14:41,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 337. [2018-10-27 09:14:41,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2018-10-27 09:14:41,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 338 transitions. [2018-10-27 09:14:41,203 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 338 transitions. Word has length 326 [2018-10-27 09:14:41,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:41,203 INFO L481 AbstractCegarLoop]: Abstraction has 337 states and 338 transitions. [2018-10-27 09:14:41,204 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-27 09:14:41,204 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 338 transitions. [2018-10-27 09:14:41,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2018-10-27 09:14:41,206 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:41,206 INFO L375 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 33, 32, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:41,206 INFO L424 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:41,206 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:41,206 INFO L82 PathProgramCache]: Analyzing trace with hash -1568017642, now seen corresponding path program 63 times [2018-10-27 09:14:41,207 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:41,207 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:41,207 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:14:41,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:41,208 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:41,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:42,728 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-27 09:14:42,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:42,728 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:42,728 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:42,728 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:42,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:42,729 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 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:42,737 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:14:42,737 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:14:42,837 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:14:42,837 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:14:42,843 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:42,910 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-27 09:14:42,911 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:44,327 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-27 09:14:44,348 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:44,348 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 69 [2018-10-27 09:14:44,348 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:44,349 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-27 09:14:44,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-27 09:14:44,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1191, Invalid=3501, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 09:14:44,349 INFO L87 Difference]: Start difference. First operand 337 states and 338 transitions. Second operand 69 states. [2018-10-27 09:14:46,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:46,658 INFO L93 Difference]: Finished difference Result 480 states and 514 transitions. [2018-10-27 09:14:46,658 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-27 09:14:46,658 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 334 [2018-10-27 09:14:46,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:46,659 INFO L225 Difference]: With dead ends: 480 [2018-10-27 09:14:46,660 INFO L226 Difference]: Without dead ends: 339 [2018-10-27 09:14:46,661 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 770 GetRequests, 603 SyntacticMatches, 66 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3728 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2449, Invalid=8057, Unknown=0, NotChecked=0, Total=10506 [2018-10-27 09:14:46,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2018-10-27 09:14:46,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 339. [2018-10-27 09:14:46,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 339 states. [2018-10-27 09:14:46,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 339 states to 339 states and 340 transitions. [2018-10-27 09:14:46,671 INFO L78 Accepts]: Start accepts. Automaton has 339 states and 340 transitions. Word has length 334 [2018-10-27 09:14:46,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:46,672 INFO L481 AbstractCegarLoop]: Abstraction has 339 states and 340 transitions. [2018-10-27 09:14:46,672 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-27 09:14:46,672 INFO L276 IsEmpty]: Start isEmpty. Operand 339 states and 340 transitions. [2018-10-27 09:14:46,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2018-10-27 09:14:46,673 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:46,673 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 33, 33, 33, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:46,673 INFO L424 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:46,674 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:46,674 INFO L82 PathProgramCache]: Analyzing trace with hash -907577072, now seen corresponding path program 64 times [2018-10-27 09:14:46,674 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:46,674 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:46,674 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:14:46,674 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:46,675 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:46,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:47,339 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1185 proven. 2174 refuted. 0 times theorem prover too weak. 1891 trivial. 0 not checked. [2018-10-27 09:14:47,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:47,340 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:47,340 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:47,340 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:47,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:47,340 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 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:47,347 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:14:47,347 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:14:47,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:47,449 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:47,578 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1186 proven. 2080 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-27 09:14:47,578 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:48,561 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1186 proven. 2080 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-27 09:14:48,581 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:48,581 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 41 [2018-10-27 09:14:48,581 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:48,582 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-27 09:14:48,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-27 09:14:48,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=642, Invalid=998, Unknown=0, NotChecked=0, Total=1640 [2018-10-27 09:14:48,582 INFO L87 Difference]: Start difference. First operand 339 states and 340 transitions. Second operand 41 states. [2018-10-27 09:14:49,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:49,080 INFO L93 Difference]: Finished difference Result 349 states and 350 transitions. [2018-10-27 09:14:49,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-27 09:14:49,081 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 336 [2018-10-27 09:14:49,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:49,083 INFO L225 Difference]: With dead ends: 349 [2018-10-27 09:14:49,083 INFO L226 Difference]: Without dead ends: 347 [2018-10-27 09:14:49,083 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 746 GetRequests, 638 SyntacticMatches, 67 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1357 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=655, Invalid=1151, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 09:14:49,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2018-10-27 09:14:49,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 347. [2018-10-27 09:14:49,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 347 states. [2018-10-27 09:14:49,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 347 states and 348 transitions. [2018-10-27 09:14:49,095 INFO L78 Accepts]: Start accepts. Automaton has 347 states and 348 transitions. Word has length 336 [2018-10-27 09:14:49,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:49,095 INFO L481 AbstractCegarLoop]: Abstraction has 347 states and 348 transitions. [2018-10-27 09:14:49,095 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-27 09:14:49,095 INFO L276 IsEmpty]: Start isEmpty. Operand 347 states and 348 transitions. [2018-10-27 09:14:49,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2018-10-27 09:14:49,097 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:49,098 INFO L375 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:49,098 INFO L424 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:49,098 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:49,098 INFO L82 PathProgramCache]: Analyzing trace with hash -1370504365, now seen corresponding path program 65 times [2018-10-27 09:14:49,098 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:49,099 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:49,099 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:14:49,099 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:49,099 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:49,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:50,926 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-27 09:14:50,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:50,926 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:50,927 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:50,927 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:50,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:50,927 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 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:50,936 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:14:50,936 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:14:51,075 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-10-27 09:14:51,075 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:14:51,080 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:51,167 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-27 09:14:51,167 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:52,554 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-27 09:14:52,574 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:52,575 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 71 [2018-10-27 09:14:52,575 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:52,575 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-10-27 09:14:52,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-10-27 09:14:52,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1261, Invalid=3709, Unknown=0, NotChecked=0, Total=4970 [2018-10-27 09:14:52,576 INFO L87 Difference]: Start difference. First operand 347 states and 348 transitions. Second operand 71 states. [2018-10-27 09:14:54,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:54,228 INFO L93 Difference]: Finished difference Result 494 states and 529 transitions. [2018-10-27 09:14:54,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-27 09:14:54,228 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 344 [2018-10-27 09:14:54,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:54,230 INFO L225 Difference]: With dead ends: 494 [2018-10-27 09:14:54,230 INFO L226 Difference]: Without dead ends: 349 [2018-10-27 09:14:54,231 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 793 GetRequests, 621 SyntacticMatches, 68 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3960 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=2591, Invalid=8539, Unknown=0, NotChecked=0, Total=11130 [2018-10-27 09:14:54,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2018-10-27 09:14:54,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 349. [2018-10-27 09:14:54,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 349 states. [2018-10-27 09:14:54,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 350 transitions. [2018-10-27 09:14:54,244 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 350 transitions. Word has length 344 [2018-10-27 09:14:54,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:54,244 INFO L481 AbstractCegarLoop]: Abstraction has 349 states and 350 transitions. [2018-10-27 09:14:54,244 INFO L482 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-10-27 09:14:54,244 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 350 transitions. [2018-10-27 09:14:54,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2018-10-27 09:14:54,246 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:54,246 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 34, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:54,246 INFO L424 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:54,246 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:54,246 INFO L82 PathProgramCache]: Analyzing trace with hash 1034000589, now seen corresponding path program 66 times [2018-10-27 09:14:54,246 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:54,247 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:54,247 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:14:54,247 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:54,247 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:54,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:54,924 INFO L134 CoverageAnalysis]: Checked inductivity of 5579 backedges. 1255 proven. 2308 refuted. 0 times theorem prover too weak. 2016 trivial. 0 not checked. [2018-10-27 09:14:54,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:54,924 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:54,925 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:54,925 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:54,925 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:54,925 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 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:54,933 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:14:54,933 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:14:55,035 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:14:55,035 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:14:55,040 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:55,168 INFO L134 CoverageAnalysis]: Checked inductivity of 5579 backedges. 1256 proven. 2211 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-27 09:14:55,168 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:56,530 INFO L134 CoverageAnalysis]: Checked inductivity of 5579 backedges. 1256 proven. 2211 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-27 09:14:56,551 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:56,551 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 42 [2018-10-27 09:14:56,551 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:56,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-27 09:14:56,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-27 09:14:56,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=678, Invalid=1044, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 09:14:56,552 INFO L87 Difference]: Start difference. First operand 349 states and 350 transitions. Second operand 42 states. [2018-10-27 09:14:57,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:57,022 INFO L93 Difference]: Finished difference Result 359 states and 360 transitions. [2018-10-27 09:14:57,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-27 09:14:57,022 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 346 [2018-10-27 09:14:57,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:57,025 INFO L225 Difference]: With dead ends: 359 [2018-10-27 09:14:57,025 INFO L226 Difference]: Without dead ends: 357 [2018-10-27 09:14:57,025 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 768 GetRequests, 657 SyntacticMatches, 69 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1432 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=691, Invalid=1201, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 09:14:57,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2018-10-27 09:14:57,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 357. [2018-10-27 09:14:57,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 357 states. [2018-10-27 09:14:57,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 358 transitions. [2018-10-27 09:14:57,036 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 358 transitions. Word has length 346 [2018-10-27 09:14:57,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:57,037 INFO L481 AbstractCegarLoop]: Abstraction has 357 states and 358 transitions. [2018-10-27 09:14:57,037 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-27 09:14:57,037 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 358 transitions. [2018-10-27 09:14:57,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 355 [2018-10-27 09:14:57,039 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:57,039 INFO L375 BasicCegarLoop]: trace histogram [35, 35, 35, 35, 35, 34, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:57,040 INFO L424 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:57,040 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:57,040 INFO L82 PathProgramCache]: Analyzing trace with hash -2013211120, now seen corresponding path program 67 times [2018-10-27 09:14:57,040 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:57,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:57,041 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:14:57,041 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:57,041 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:57,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:58,732 INFO L134 CoverageAnalysis]: Checked inductivity of 5848 backedges. 2414 proven. 1190 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-27 09:14:58,732 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:58,732 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:58,732 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:58,732 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:58,733 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:58,733 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:58,740 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:14:58,740 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:14:58,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:58,845 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:58,918 INFO L134 CoverageAnalysis]: Checked inductivity of 5848 backedges. 2414 proven. 1190 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-27 09:14:58,919 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:15:00,412 INFO L134 CoverageAnalysis]: Checked inductivity of 5848 backedges. 2414 proven. 1190 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-27 09:15:00,432 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:15:00,432 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 73 [2018-10-27 09:15:00,433 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:15:00,433 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-10-27 09:15:00,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-10-27 09:15:00,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1333, Invalid=3923, Unknown=0, NotChecked=0, Total=5256 [2018-10-27 09:15:00,434 INFO L87 Difference]: Start difference. First operand 357 states and 358 transitions. Second operand 73 states. [2018-10-27 09:15:02,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:15:02,322 INFO L93 Difference]: Finished difference Result 508 states and 544 transitions. [2018-10-27 09:15:02,322 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-10-27 09:15:02,322 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 354 [2018-10-27 09:15:02,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:15:02,323 INFO L225 Difference]: With dead ends: 508 [2018-10-27 09:15:02,324 INFO L226 Difference]: Without dead ends: 359 [2018-10-27 09:15:02,325 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 816 GetRequests, 639 SyntacticMatches, 70 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4199 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2737, Invalid=9035, Unknown=0, NotChecked=0, Total=11772 [2018-10-27 09:15:02,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2018-10-27 09:15:02,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 359. [2018-10-27 09:15:02,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 359 states. [2018-10-27 09:15:02,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 360 transitions. [2018-10-27 09:15:02,338 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 360 transitions. Word has length 354 [2018-10-27 09:15:02,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:15:02,338 INFO L481 AbstractCegarLoop]: Abstraction has 359 states and 360 transitions. [2018-10-27 09:15:02,338 INFO L482 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-10-27 09:15:02,338 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 360 transitions. [2018-10-27 09:15:02,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 357 [2018-10-27 09:15:02,340 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:02,340 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 35, 35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:02,340 INFO L424 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:02,340 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:02,340 INFO L82 PathProgramCache]: Analyzing trace with hash 600414986, now seen corresponding path program 68 times [2018-10-27 09:15:02,340 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:02,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:02,341 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:15:02,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:02,341 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:02,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:03,017 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 1327 proven. 2446 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-27 09:15:03,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:03,017 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:15:03,017 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:15:03,017 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:15:03,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:03,018 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:15:03,025 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:15:03,025 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:15:03,183 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-10-27 09:15:03,184 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:15:03,189 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:15:03,324 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 1328 proven. 2346 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-27 09:15:03,324 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:15:04,351 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 1328 proven. 2346 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-27 09:15:04,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:15:04,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 40] total 43 [2018-10-27 09:15:04,372 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:15:04,372 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-27 09:15:04,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-27 09:15:04,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=715, Invalid=1091, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 09:15:04,373 INFO L87 Difference]: Start difference. First operand 359 states and 360 transitions. Second operand 43 states. [2018-10-27 09:15:04,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:15:04,878 INFO L93 Difference]: Finished difference Result 369 states and 370 transitions. [2018-10-27 09:15:04,878 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-27 09:15:04,878 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 356 [2018-10-27 09:15:04,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:15:04,881 INFO L225 Difference]: With dead ends: 369 [2018-10-27 09:15:04,881 INFO L226 Difference]: Without dead ends: 367 [2018-10-27 09:15:04,881 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 790 GetRequests, 676 SyntacticMatches, 71 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1509 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=728, Invalid=1252, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 09:15:04,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2018-10-27 09:15:04,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 367. [2018-10-27 09:15:04,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 367 states. [2018-10-27 09:15:04,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 368 transitions. [2018-10-27 09:15:04,909 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 368 transitions. Word has length 356 [2018-10-27 09:15:04,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:15:04,909 INFO L481 AbstractCegarLoop]: Abstraction has 367 states and 368 transitions. [2018-10-27 09:15:04,909 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-27 09:15:04,909 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 368 transitions. [2018-10-27 09:15:04,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 365 [2018-10-27 09:15:04,911 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:04,911 INFO L375 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 36, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:04,911 INFO L424 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:04,911 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:04,911 INFO L82 PathProgramCache]: Analyzing trace with hash -1554691251, now seen corresponding path program 69 times [2018-10-27 09:15:04,911 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:04,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:04,912 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:15:04,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:04,912 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:04,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:06,787 INFO L134 CoverageAnalysis]: Checked inductivity of 6195 backedges. 2555 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-27 09:15:06,787 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:06,787 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:15:06,787 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:15:06,787 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:15:06,787 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:06,787 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 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:15:06,795 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:15:06,795 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:15:06,904 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:15:06,905 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:15:06,911 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:15:06,988 INFO L134 CoverageAnalysis]: Checked inductivity of 6195 backedges. 2555 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-27 09:15:06,988 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:15:08,780 INFO L134 CoverageAnalysis]: Checked inductivity of 6195 backedges. 2555 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-27 09:15:08,801 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:15:08,801 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 75 [2018-10-27 09:15:08,801 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:15:08,802 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-10-27 09:15:08,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-10-27 09:15:08,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1407, Invalid=4143, Unknown=0, NotChecked=0, Total=5550 [2018-10-27 09:15:08,803 INFO L87 Difference]: Start difference. First operand 367 states and 368 transitions. Second operand 75 states. [2018-10-27 09:15:11,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:15:11,525 INFO L93 Difference]: Finished difference Result 522 states and 559 transitions. [2018-10-27 09:15:11,526 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-10-27 09:15:11,526 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 364 [2018-10-27 09:15:11,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:15:11,527 INFO L225 Difference]: With dead ends: 522 [2018-10-27 09:15:11,527 INFO L226 Difference]: Without dead ends: 369 [2018-10-27 09:15:11,529 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 839 GetRequests, 657 SyntacticMatches, 72 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4445 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=2887, Invalid=9545, Unknown=0, NotChecked=0, Total=12432 [2018-10-27 09:15:11,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2018-10-27 09:15:11,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 369. [2018-10-27 09:15:11,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 369 states. [2018-10-27 09:15:11,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369 states to 369 states and 370 transitions. [2018-10-27 09:15:11,546 INFO L78 Accepts]: Start accepts. Automaton has 369 states and 370 transitions. Word has length 364 [2018-10-27 09:15:11,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:15:11,546 INFO L481 AbstractCegarLoop]: Abstraction has 369 states and 370 transitions. [2018-10-27 09:15:11,546 INFO L482 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-10-27 09:15:11,546 INFO L276 IsEmpty]: Start isEmpty. Operand 369 states and 370 transitions. [2018-10-27 09:15:11,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 367 [2018-10-27 09:15:11,548 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:11,549 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 36, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:11,549 INFO L424 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:11,549 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:11,549 INFO L82 PathProgramCache]: Analyzing trace with hash -1521508409, now seen corresponding path program 70 times [2018-10-27 09:15:11,549 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:11,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:11,550 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:15:11,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:11,550 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:11,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:12,271 INFO L134 CoverageAnalysis]: Checked inductivity of 6267 backedges. 1401 proven. 2588 refuted. 0 times theorem prover too weak. 2278 trivial. 0 not checked. [2018-10-27 09:15:12,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:12,271 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:15:12,272 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:15:12,272 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:15:12,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:12,272 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 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:15:12,278 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:15:12,279 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:15:12,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:12,389 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:15:12,524 INFO L134 CoverageAnalysis]: Checked inductivity of 6267 backedges. 1402 proven. 2485 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-27 09:15:12,524 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:15:13,652 INFO L134 CoverageAnalysis]: Checked inductivity of 6267 backedges. 1402 proven. 2485 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-27 09:15:13,673 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:15:13,673 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 44 [2018-10-27 09:15:13,674 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:15:13,674 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-27 09:15:13,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-27 09:15:13,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=753, Invalid=1139, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 09:15:13,675 INFO L87 Difference]: Start difference. First operand 369 states and 370 transitions. Second operand 44 states. [2018-10-27 09:15:14,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:15:14,234 INFO L93 Difference]: Finished difference Result 379 states and 380 transitions. [2018-10-27 09:15:14,234 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-27 09:15:14,234 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 366 [2018-10-27 09:15:14,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:15:14,237 INFO L225 Difference]: With dead ends: 379 [2018-10-27 09:15:14,237 INFO L226 Difference]: Without dead ends: 377 [2018-10-27 09:15:14,237 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 812 GetRequests, 695 SyntacticMatches, 73 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1588 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=766, Invalid=1304, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 09:15:14,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2018-10-27 09:15:14,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 377. [2018-10-27 09:15:14,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 377 states. [2018-10-27 09:15:14,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 378 transitions. [2018-10-27 09:15:14,253 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 378 transitions. Word has length 366 [2018-10-27 09:15:14,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:15:14,254 INFO L481 AbstractCegarLoop]: Abstraction has 377 states and 378 transitions. [2018-10-27 09:15:14,254 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-27 09:15:14,254 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 378 transitions. [2018-10-27 09:15:14,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2018-10-27 09:15:14,256 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:14,256 INFO L375 BasicCegarLoop]: trace histogram [37, 37, 37, 37, 37, 36, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:14,256 INFO L424 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:14,257 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:14,257 INFO L82 PathProgramCache]: Analyzing trace with hash -954383606, now seen corresponding path program 71 times [2018-10-27 09:15:14,257 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:14,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:14,258 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:15:14,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:14,258 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:14,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:15,929 INFO L134 CoverageAnalysis]: Checked inductivity of 6552 backedges. 2700 proven. 1332 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-27 09:15:15,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:15,929 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:15:15,929 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:15:15,929 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:15:15,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:15,930 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 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:15:15,936 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:15:15,936 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:15:16,097 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2018-10-27 09:15:16,097 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:15:16,102 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:15:16,185 INFO L134 CoverageAnalysis]: Checked inductivity of 6552 backedges. 2700 proven. 1332 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-27 09:15:16,185 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:15:17,957 INFO L134 CoverageAnalysis]: Checked inductivity of 6552 backedges. 2700 proven. 1332 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-27 09:15:17,978 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:15:17,978 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 77 [2018-10-27 09:15:17,978 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:15:17,979 INFO L460 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-10-27 09:15:17,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-10-27 09:15:17,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4369, Unknown=0, NotChecked=0, Total=5852 [2018-10-27 09:15:17,980 INFO L87 Difference]: Start difference. First operand 377 states and 378 transitions. Second operand 77 states. [2018-10-27 09:15:20,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:15:20,537 INFO L93 Difference]: Finished difference Result 536 states and 574 transitions. [2018-10-27 09:15:20,537 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-10-27 09:15:20,537 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 374 [2018-10-27 09:15:20,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:15:20,539 INFO L225 Difference]: With dead ends: 536 [2018-10-27 09:15:20,539 INFO L226 Difference]: Without dead ends: 379 [2018-10-27 09:15:20,540 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 862 GetRequests, 675 SyntacticMatches, 74 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4698 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=3041, Invalid=10069, Unknown=0, NotChecked=0, Total=13110 [2018-10-27 09:15:20,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2018-10-27 09:15:20,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 379. [2018-10-27 09:15:20,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 379 states. [2018-10-27 09:15:20,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 380 transitions. [2018-10-27 09:15:20,553 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 380 transitions. Word has length 374 [2018-10-27 09:15:20,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:15:20,554 INFO L481 AbstractCegarLoop]: Abstraction has 379 states and 380 transitions. [2018-10-27 09:15:20,554 INFO L482 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-10-27 09:15:20,554 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 380 transitions. [2018-10-27 09:15:20,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 377 [2018-10-27 09:15:20,555 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:20,555 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 37, 37, 37, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:20,556 INFO L424 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:20,556 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:20,556 INFO L82 PathProgramCache]: Analyzing trace with hash 406570756, now seen corresponding path program 72 times [2018-10-27 09:15:20,556 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:20,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:20,556 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:15:20,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:20,557 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:20,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:21,612 INFO L134 CoverageAnalysis]: Checked inductivity of 6626 backedges. 1477 proven. 2734 refuted. 0 times theorem prover too weak. 2415 trivial. 0 not checked. [2018-10-27 09:15:21,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:21,612 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:15:21,612 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:15:21,612 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:15:21,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:21,612 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 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:15:21,620 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:15:21,620 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:15:21,731 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:15:21,731 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:15:21,737 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:15:21,879 INFO L134 CoverageAnalysis]: Checked inductivity of 6626 backedges. 1478 proven. 2628 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-27 09:15:21,880 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:15:23,076 INFO L134 CoverageAnalysis]: Checked inductivity of 6626 backedges. 1478 proven. 2628 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-27 09:15:23,098 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:15:23,098 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 45 [2018-10-27 09:15:23,098 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:15:23,099 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-27 09:15:23,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-27 09:15:23,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=792, Invalid=1188, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 09:15:23,099 INFO L87 Difference]: Start difference. First operand 379 states and 380 transitions. Second operand 45 states. [2018-10-27 09:15:23,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:15:23,588 INFO L93 Difference]: Finished difference Result 389 states and 390 transitions. [2018-10-27 09:15:23,588 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-27 09:15:23,588 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 376 [2018-10-27 09:15:23,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:15:23,590 INFO L225 Difference]: With dead ends: 389 [2018-10-27 09:15:23,590 INFO L226 Difference]: Without dead ends: 387 [2018-10-27 09:15:23,590 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 834 GetRequests, 714 SyntacticMatches, 75 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1669 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=805, Invalid=1357, Unknown=0, NotChecked=0, Total=2162 [2018-10-27 09:15:23,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2018-10-27 09:15:23,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 387. [2018-10-27 09:15:23,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 387 states. [2018-10-27 09:15:23,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 388 transitions. [2018-10-27 09:15:23,603 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 388 transitions. Word has length 376 [2018-10-27 09:15:23,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:15:23,603 INFO L481 AbstractCegarLoop]: Abstraction has 387 states and 388 transitions. [2018-10-27 09:15:23,603 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-27 09:15:23,604 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 388 transitions. [2018-10-27 09:15:23,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 385 [2018-10-27 09:15:23,606 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:23,606 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 38, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:23,606 INFO L424 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:23,606 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:23,607 INFO L82 PathProgramCache]: Analyzing trace with hash 1329651015, now seen corresponding path program 73 times [2018-10-27 09:15:23,607 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:23,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:23,607 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:15:23,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:23,608 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:23,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:25,389 INFO L134 CoverageAnalysis]: Checked inductivity of 6919 backedges. 2849 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-27 09:15:25,390 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:25,390 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:15:25,390 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:15:25,390 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:15:25,390 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:25,390 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 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:15:25,397 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:15:25,397 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:15:25,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:25,511 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:15:25,595 INFO L134 CoverageAnalysis]: Checked inductivity of 6919 backedges. 2849 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-27 09:15:25,596 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:15:27,569 INFO L134 CoverageAnalysis]: Checked inductivity of 6919 backedges. 2849 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-27 09:15:27,590 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:15:27,590 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 79 [2018-10-27 09:15:27,590 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:15:27,591 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-10-27 09:15:27,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-10-27 09:15:27,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1561, Invalid=4601, Unknown=0, NotChecked=0, Total=6162 [2018-10-27 09:15:27,592 INFO L87 Difference]: Start difference. First operand 387 states and 388 transitions. Second operand 79 states. [2018-10-27 09:15:30,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:15:30,316 INFO L93 Difference]: Finished difference Result 550 states and 589 transitions. [2018-10-27 09:15:30,322 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-10-27 09:15:30,322 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 384 [2018-10-27 09:15:30,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:15:30,324 INFO L225 Difference]: With dead ends: 550 [2018-10-27 09:15:30,325 INFO L226 Difference]: Without dead ends: 389 [2018-10-27 09:15:30,326 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 885 GetRequests, 693 SyntacticMatches, 76 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4958 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3199, Invalid=10607, Unknown=0, NotChecked=0, Total=13806 [2018-10-27 09:15:30,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2018-10-27 09:15:30,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 389. [2018-10-27 09:15:30,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 389 states. [2018-10-27 09:15:30,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 389 states to 389 states and 390 transitions. [2018-10-27 09:15:30,344 INFO L78 Accepts]: Start accepts. Automaton has 389 states and 390 transitions. Word has length 384 [2018-10-27 09:15:30,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:15:30,345 INFO L481 AbstractCegarLoop]: Abstraction has 389 states and 390 transitions. [2018-10-27 09:15:30,345 INFO L482 AbstractCegarLoop]: Interpolant automaton has 79 states. [2018-10-27 09:15:30,345 INFO L276 IsEmpty]: Start isEmpty. Operand 389 states and 390 transitions. [2018-10-27 09:15:30,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2018-10-27 09:15:30,347 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:30,347 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 38, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:30,347 INFO L424 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:30,348 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:30,348 INFO L82 PathProgramCache]: Analyzing trace with hash -1045548863, now seen corresponding path program 74 times [2018-10-27 09:15:30,348 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:30,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:30,349 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:15:30,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:30,349 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:30,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:31,148 INFO L134 CoverageAnalysis]: Checked inductivity of 6995 backedges. 1555 proven. 2884 refuted. 0 times theorem prover too weak. 2556 trivial. 0 not checked. [2018-10-27 09:15:31,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:31,148 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:15:31,148 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:15:31,148 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:15:31,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:31,148 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 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:15:31,156 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:15:31,156 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:15:31,333 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-10-27 09:15:31,333 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:15:31,339 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:15:31,550 INFO L134 CoverageAnalysis]: Checked inductivity of 6995 backedges. 1556 proven. 2775 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-27 09:15:31,550 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:15:32,810 INFO L134 CoverageAnalysis]: Checked inductivity of 6995 backedges. 1556 proven. 2775 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-27 09:15:32,832 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:15:32,832 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 46 [2018-10-27 09:15:32,832 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:15:32,833 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-27 09:15:32,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-27 09:15:32,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=832, Invalid=1238, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 09:15:32,833 INFO L87 Difference]: Start difference. First operand 389 states and 390 transitions. Second operand 46 states. [2018-10-27 09:15:33,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:15:33,411 INFO L93 Difference]: Finished difference Result 399 states and 400 transitions. [2018-10-27 09:15:33,412 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-27 09:15:33,412 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 386 [2018-10-27 09:15:33,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:15:33,414 INFO L225 Difference]: With dead ends: 399 [2018-10-27 09:15:33,414 INFO L226 Difference]: Without dead ends: 397 [2018-10-27 09:15:33,415 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 856 GetRequests, 733 SyntacticMatches, 77 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1752 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=845, Invalid=1411, Unknown=0, NotChecked=0, Total=2256 [2018-10-27 09:15:33,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2018-10-27 09:15:33,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 397. [2018-10-27 09:15:33,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 397 states. [2018-10-27 09:15:33,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 398 transitions. [2018-10-27 09:15:33,428 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 398 transitions. Word has length 386 [2018-10-27 09:15:33,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:15:33,428 INFO L481 AbstractCegarLoop]: Abstraction has 397 states and 398 transitions. [2018-10-27 09:15:33,428 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-27 09:15:33,428 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 398 transitions. [2018-10-27 09:15:33,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 395 [2018-10-27 09:15:33,430 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:33,430 INFO L375 BasicCegarLoop]: trace histogram [39, 39, 39, 39, 39, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:33,430 INFO L424 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:33,430 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:33,430 INFO L82 PathProgramCache]: Analyzing trace with hash -289392124, now seen corresponding path program 75 times [2018-10-27 09:15:33,431 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:33,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:33,431 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:15:33,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:33,431 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:33,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:35,294 INFO L134 CoverageAnalysis]: Checked inductivity of 7296 backedges. 3002 proven. 1482 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2018-10-27 09:15:35,294 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:35,294 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:15:35,294 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:15:35,294 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:15:35,294 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:35,295 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 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:15:35,301 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:15:35,302 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:15:35,420 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:15:35,420 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:15:35,427 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:15:35,516 INFO L134 CoverageAnalysis]: Checked inductivity of 7296 backedges. 3002 proven. 1482 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2018-10-27 09:15:35,516 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:15:37,611 INFO L134 CoverageAnalysis]: Checked inductivity of 7296 backedges. 3002 proven. 1482 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2018-10-27 09:15:37,632 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:15:37,632 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 81 [2018-10-27 09:15:37,632 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:15:37,633 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2018-10-27 09:15:37,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2018-10-27 09:15:37,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1641, Invalid=4839, Unknown=0, NotChecked=0, Total=6480 [2018-10-27 09:15:37,633 INFO L87 Difference]: Start difference. First operand 397 states and 398 transitions. Second operand 81 states. [2018-10-27 09:15:40,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:15:40,576 INFO L93 Difference]: Finished difference Result 564 states and 604 transitions. [2018-10-27 09:15:40,576 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-10-27 09:15:40,576 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 394 [2018-10-27 09:15:40,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:15:40,578 INFO L225 Difference]: With dead ends: 564 [2018-10-27 09:15:40,578 INFO L226 Difference]: Without dead ends: 399 [2018-10-27 09:15:40,580 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 908 GetRequests, 711 SyntacticMatches, 78 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5225 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=3361, Invalid=11159, Unknown=0, NotChecked=0, Total=14520 [2018-10-27 09:15:40,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2018-10-27 09:15:40,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 399. [2018-10-27 09:15:40,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 399 states. [2018-10-27 09:15:40,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 400 transitions. [2018-10-27 09:15:40,594 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 400 transitions. Word has length 394 [2018-10-27 09:15:40,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:15:40,595 INFO L481 AbstractCegarLoop]: Abstraction has 399 states and 400 transitions. [2018-10-27 09:15:40,595 INFO L482 AbstractCegarLoop]: Interpolant automaton has 81 states. [2018-10-27 09:15:40,595 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 400 transitions. [2018-10-27 09:15:40,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 397 [2018-10-27 09:15:40,597 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:40,597 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 39, 39, 39, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:40,597 INFO L424 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:40,598 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:40,598 INFO L82 PathProgramCache]: Analyzing trace with hash 400489726, now seen corresponding path program 76 times [2018-10-27 09:15:40,598 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:40,598 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:40,599 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:15:40,599 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:40,599 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:40,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:41,451 INFO L134 CoverageAnalysis]: Checked inductivity of 7374 backedges. 1635 proven. 3038 refuted. 0 times theorem prover too weak. 2701 trivial. 0 not checked. [2018-10-27 09:15:41,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:41,452 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:15:41,452 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:15:41,452 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:15:41,452 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:41,452 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 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:15:41,458 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:15:41,459 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:15:41,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:41,574 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:15:41,795 INFO L134 CoverageAnalysis]: Checked inductivity of 7374 backedges. 1636 proven. 2926 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2018-10-27 09:15:41,795 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:15:43,072 INFO L134 CoverageAnalysis]: Checked inductivity of 7374 backedges. 1636 proven. 2926 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2018-10-27 09:15:43,092 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:15:43,092 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 44] total 47 [2018-10-27 09:15:43,092 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:15:43,093 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-27 09:15:43,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-27 09:15:43,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=873, Invalid=1289, Unknown=0, NotChecked=0, Total=2162 [2018-10-27 09:15:43,094 INFO L87 Difference]: Start difference. First operand 399 states and 400 transitions. Second operand 47 states. [2018-10-27 09:15:43,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:15:43,675 INFO L93 Difference]: Finished difference Result 409 states and 410 transitions. [2018-10-27 09:15:43,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-27 09:15:43,675 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 396 [2018-10-27 09:15:43,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:15:43,678 INFO L225 Difference]: With dead ends: 409 [2018-10-27 09:15:43,678 INFO L226 Difference]: Without dead ends: 407 [2018-10-27 09:15:43,678 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 878 GetRequests, 752 SyntacticMatches, 79 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1837 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=886, Invalid=1466, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 09:15:43,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2018-10-27 09:15:43,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 407. [2018-10-27 09:15:43,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 407 states. [2018-10-27 09:15:43,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 408 transitions. [2018-10-27 09:15:43,691 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 408 transitions. Word has length 396 [2018-10-27 09:15:43,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:15:43,691 INFO L481 AbstractCegarLoop]: Abstraction has 407 states and 408 transitions. [2018-10-27 09:15:43,691 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-27 09:15:43,692 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 408 transitions. [2018-10-27 09:15:43,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 405 [2018-10-27 09:15:43,693 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:43,693 INFO L375 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 40, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:43,693 INFO L424 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:43,694 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:43,694 INFO L82 PathProgramCache]: Analyzing trace with hash -239896255, now seen corresponding path program 77 times [2018-10-27 09:15:43,694 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:43,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:43,694 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:15:43,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:43,695 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:43,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:45,820 INFO L134 CoverageAnalysis]: Checked inductivity of 7683 backedges. 3159 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2018-10-27 09:15:45,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:45,820 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:15:45,820 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:15:45,821 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:15:45,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:45,821 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 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:15:45,827 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:15:45,827 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:15:46,008 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-10-27 09:15:46,008 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:15:46,014 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:15:46,107 INFO L134 CoverageAnalysis]: Checked inductivity of 7683 backedges. 3159 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2018-10-27 09:15:46,108 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:15:48,321 INFO L134 CoverageAnalysis]: Checked inductivity of 7683 backedges. 3159 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2018-10-27 09:15:48,341 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:15:48,342 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 83 [2018-10-27 09:15:48,342 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:15:48,342 INFO L460 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-10-27 09:15:48,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-10-27 09:15:48,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1723, Invalid=5083, Unknown=0, NotChecked=0, Total=6806 [2018-10-27 09:15:48,343 INFO L87 Difference]: Start difference. First operand 407 states and 408 transitions. Second operand 83 states. [2018-10-27 09:15:51,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:15:51,608 INFO L93 Difference]: Finished difference Result 578 states and 619 transitions. [2018-10-27 09:15:51,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-10-27 09:15:51,608 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 404 [2018-10-27 09:15:51,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:15:51,610 INFO L225 Difference]: With dead ends: 578 [2018-10-27 09:15:51,610 INFO L226 Difference]: Without dead ends: 409 [2018-10-27 09:15:51,611 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 931 GetRequests, 729 SyntacticMatches, 80 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5499 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=3527, Invalid=11725, Unknown=0, NotChecked=0, Total=15252 [2018-10-27 09:15:51,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409 states. [2018-10-27 09:15:51,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409 to 409. [2018-10-27 09:15:51,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 409 states. [2018-10-27 09:15:51,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 410 transitions. [2018-10-27 09:15:51,630 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 410 transitions. Word has length 404 [2018-10-27 09:15:51,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:15:51,630 INFO L481 AbstractCegarLoop]: Abstraction has 409 states and 410 transitions. [2018-10-27 09:15:51,630 INFO L482 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-10-27 09:15:51,631 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 410 transitions. [2018-10-27 09:15:51,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 407 [2018-10-27 09:15:51,633 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:51,633 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 40, 40, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:51,633 INFO L424 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:51,633 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:51,634 INFO L82 PathProgramCache]: Analyzing trace with hash -2078389317, now seen corresponding path program 78 times [2018-10-27 09:15:51,634 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:51,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:51,634 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:15:51,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:51,634 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:51,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:52,758 INFO L134 CoverageAnalysis]: Checked inductivity of 7763 backedges. 1717 proven. 3196 refuted. 0 times theorem prover too weak. 2850 trivial. 0 not checked. [2018-10-27 09:15:52,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:52,759 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:15:52,759 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:15:52,759 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:15:52,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:52,759 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 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:15:52,766 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:15:52,766 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:15:52,885 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:15:52,886 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:15:52,893 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:15:53,051 INFO L134 CoverageAnalysis]: Checked inductivity of 7763 backedges. 1718 proven. 3081 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2018-10-27 09:15:53,051 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:15:54,413 INFO L134 CoverageAnalysis]: Checked inductivity of 7763 backedges. 1718 proven. 3081 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2018-10-27 09:15:54,434 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:15:54,434 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45, 45] total 48 [2018-10-27 09:15:54,434 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:15:54,435 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-27 09:15:54,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-27 09:15:54,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=915, Invalid=1341, Unknown=0, NotChecked=0, Total=2256 [2018-10-27 09:15:54,435 INFO L87 Difference]: Start difference. First operand 409 states and 410 transitions. Second operand 48 states. [2018-10-27 09:15:54,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:15:54,989 INFO L93 Difference]: Finished difference Result 419 states and 420 transitions. [2018-10-27 09:15:54,989 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-27 09:15:54,989 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 406 [2018-10-27 09:15:54,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:15:54,992 INFO L225 Difference]: With dead ends: 419 [2018-10-27 09:15:54,992 INFO L226 Difference]: Without dead ends: 417 [2018-10-27 09:15:54,993 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 900 GetRequests, 771 SyntacticMatches, 81 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1924 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=928, Invalid=1522, Unknown=0, NotChecked=0, Total=2450 [2018-10-27 09:15:54,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2018-10-27 09:15:55,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 417. [2018-10-27 09:15:55,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 417 states. [2018-10-27 09:15:55,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 417 states to 417 states and 418 transitions. [2018-10-27 09:15:55,006 INFO L78 Accepts]: Start accepts. Automaton has 417 states and 418 transitions. Word has length 406 [2018-10-27 09:15:55,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:15:55,007 INFO L481 AbstractCegarLoop]: Abstraction has 417 states and 418 transitions. [2018-10-27 09:15:55,007 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-27 09:15:55,007 INFO L276 IsEmpty]: Start isEmpty. Operand 417 states and 418 transitions. [2018-10-27 09:15:55,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 415 [2018-10-27 09:15:55,009 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:55,009 INFO L375 BasicCegarLoop]: trace histogram [41, 41, 41, 41, 41, 40, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:55,009 INFO L424 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:55,009 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:55,009 INFO L82 PathProgramCache]: Analyzing trace with hash -11879682, now seen corresponding path program 79 times [2018-10-27 09:15:55,009 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:55,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:55,010 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:15:55,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:55,010 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:55,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:57,408 INFO L134 CoverageAnalysis]: Checked inductivity of 8080 backedges. 3320 proven. 1640 refuted. 0 times theorem prover too weak. 3120 trivial. 0 not checked. [2018-10-27 09:15:57,408 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:57,408 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:15:57,408 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:15:57,408 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:15:57,408 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:57,408 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 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:15:57,416 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:15:57,416 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:15:57,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:57,536 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:15:57,633 INFO L134 CoverageAnalysis]: Checked inductivity of 8080 backedges. 3320 proven. 1640 refuted. 0 times theorem prover too weak. 3120 trivial. 0 not checked. [2018-10-27 09:15:57,633 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:15:59,617 INFO L134 CoverageAnalysis]: Checked inductivity of 8080 backedges. 3320 proven. 1640 refuted. 0 times theorem prover too weak. 3120 trivial. 0 not checked. [2018-10-27 09:15:59,638 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:15:59,638 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 85 [2018-10-27 09:15:59,638 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:15:59,638 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2018-10-27 09:15:59,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2018-10-27 09:15:59,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1807, Invalid=5333, Unknown=0, NotChecked=0, Total=7140 [2018-10-27 09:15:59,639 INFO L87 Difference]: Start difference. First operand 417 states and 418 transitions. Second operand 85 states. [2018-10-27 09:16:03,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:03,173 INFO L93 Difference]: Finished difference Result 592 states and 634 transitions. [2018-10-27 09:16:03,174 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-10-27 09:16:03,174 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 414 [2018-10-27 09:16:03,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:03,176 INFO L225 Difference]: With dead ends: 592 [2018-10-27 09:16:03,176 INFO L226 Difference]: Without dead ends: 419 [2018-10-27 09:16:03,177 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 954 GetRequests, 747 SyntacticMatches, 82 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5780 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=3697, Invalid=12305, Unknown=0, NotChecked=0, Total=16002 [2018-10-27 09:16:03,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2018-10-27 09:16:03,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 419. [2018-10-27 09:16:03,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 419 states. [2018-10-27 09:16:03,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 419 states to 419 states and 420 transitions. [2018-10-27 09:16:03,192 INFO L78 Accepts]: Start accepts. Automaton has 419 states and 420 transitions. Word has length 414 [2018-10-27 09:16:03,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:03,192 INFO L481 AbstractCegarLoop]: Abstraction has 419 states and 420 transitions. [2018-10-27 09:16:03,192 INFO L482 AbstractCegarLoop]: Interpolant automaton has 85 states. [2018-10-27 09:16:03,192 INFO L276 IsEmpty]: Start isEmpty. Operand 419 states and 420 transitions. [2018-10-27 09:16:03,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 417 [2018-10-27 09:16:03,194 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:03,194 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 41, 41, 41, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:03,194 INFO L424 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:03,195 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:03,195 INFO L82 PathProgramCache]: Analyzing trace with hash -1529594632, now seen corresponding path program 80 times [2018-10-27 09:16:03,195 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:03,195 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:03,195 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:03,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:03,196 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:03,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:04,110 INFO L134 CoverageAnalysis]: Checked inductivity of 8162 backedges. 1801 proven. 3358 refuted. 0 times theorem prover too weak. 3003 trivial. 0 not checked. [2018-10-27 09:16:04,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:04,110 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:04,110 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:04,110 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:04,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:04,110 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 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:04,118 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:16:04,119 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:16:04,303 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-10-27 09:16:04,303 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:04,309 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:04,490 INFO L134 CoverageAnalysis]: Checked inductivity of 8162 backedges. 1802 proven. 3240 refuted. 0 times theorem prover too weak. 3120 trivial. 0 not checked. [2018-10-27 09:16:04,491 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:05,915 INFO L134 CoverageAnalysis]: Checked inductivity of 8162 backedges. 1802 proven. 3240 refuted. 0 times theorem prover too weak. 3120 trivial. 0 not checked. [2018-10-27 09:16:05,936 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:05,936 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 49 [2018-10-27 09:16:05,936 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:05,937 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-27 09:16:05,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-27 09:16:05,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=958, Invalid=1394, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 09:16:05,937 INFO L87 Difference]: Start difference. First operand 419 states and 420 transitions. Second operand 49 states. [2018-10-27 09:16:06,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:06,552 INFO L93 Difference]: Finished difference Result 429 states and 430 transitions. [2018-10-27 09:16:06,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-27 09:16:06,552 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 416 [2018-10-27 09:16:06,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:06,555 INFO L225 Difference]: With dead ends: 429 [2018-10-27 09:16:06,555 INFO L226 Difference]: Without dead ends: 427 [2018-10-27 09:16:06,555 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 922 GetRequests, 790 SyntacticMatches, 83 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2013 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=971, Invalid=1579, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 09:16:06,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 427 states. [2018-10-27 09:16:06,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 427 to 427. [2018-10-27 09:16:06,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 427 states. [2018-10-27 09:16:06,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 427 states to 427 states and 428 transitions. [2018-10-27 09:16:06,574 INFO L78 Accepts]: Start accepts. Automaton has 427 states and 428 transitions. Word has length 416 [2018-10-27 09:16:06,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:06,575 INFO L481 AbstractCegarLoop]: Abstraction has 427 states and 428 transitions. [2018-10-27 09:16:06,575 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-27 09:16:06,575 INFO L276 IsEmpty]: Start isEmpty. Operand 427 states and 428 transitions. [2018-10-27 09:16:06,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 425 [2018-10-27 09:16:06,577 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:06,577 INFO L375 BasicCegarLoop]: trace histogram [42, 42, 42, 42, 42, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:06,577 INFO L424 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:06,577 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:06,578 INFO L82 PathProgramCache]: Analyzing trace with hash 1540235067, now seen corresponding path program 81 times [2018-10-27 09:16:06,578 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:06,578 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:06,578 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:06,578 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:06,578 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:06,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:08,974 INFO L134 CoverageAnalysis]: Checked inductivity of 8487 backedges. 3485 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2018-10-27 09:16:08,974 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:08,974 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:08,974 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:08,974 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:08,975 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:08,975 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 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:08,983 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:16:08,984 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:16:09,124 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:16:09,124 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:09,132 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:09,237 INFO L134 CoverageAnalysis]: Checked inductivity of 8487 backedges. 3485 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2018-10-27 09:16:09,238 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:11,323 INFO L134 CoverageAnalysis]: Checked inductivity of 8487 backedges. 3485 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2018-10-27 09:16:11,345 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:11,345 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 87 [2018-10-27 09:16:11,346 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:11,346 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-10-27 09:16:11,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-10-27 09:16:11,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1893, Invalid=5589, Unknown=0, NotChecked=0, Total=7482 [2018-10-27 09:16:11,347 INFO L87 Difference]: Start difference. First operand 427 states and 428 transitions. Second operand 87 states. Received shutdown request... [2018-10-27 09:16:11,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 09:16:11,367 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-27 09:16:11,372 WARN L205 ceAbstractionStarter]: Timeout [2018-10-27 09:16:11,372 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 09:16:11 BoogieIcfgContainer [2018-10-27 09:16:11,372 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-27 09:16:11,372 INFO L168 Benchmark]: Toolchain (without parser) took 227545.61 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 843.6 MB). Free memory was 1.4 GB in the beginning and 2.0 GB in the end (delta: -636.2 MB). Peak memory consumption was 207.4 MB. Max. memory is 7.1 GB. [2018-10-27 09:16:11,373 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 09:16:11,373 INFO L168 Benchmark]: CACSL2BoogieTranslator took 271.54 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-27 09:16:11,374 INFO L168 Benchmark]: Boogie Procedure Inliner took 21.32 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 09:16:11,374 INFO L168 Benchmark]: Boogie Preprocessor took 21.74 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 09:16:11,374 INFO L168 Benchmark]: RCFGBuilder took 347.49 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 692.6 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -743.6 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. [2018-10-27 09:16:11,375 INFO L168 Benchmark]: TraceAbstraction took 226877.47 ms. Allocated memory was 2.2 GB in the beginning and 2.3 GB in the end (delta: 151.0 MB). Free memory was 2.1 GB in the beginning and 2.0 GB in the end (delta: 96.8 MB). Peak memory consumption was 247.8 MB. Max. memory is 7.1 GB. [2018-10-27 09:16:11,378 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 271.54 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 21.32 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 21.74 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 347.49 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 692.6 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -743.6 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 226877.47 ms. Allocated memory was 2.2 GB in the beginning and 2.3 GB in the end (delta: 151.0 MB). Free memory was 2.1 GB in the beginning and 2.0 GB in the end (delta: 96.8 MB). Peak memory consumption was 247.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was constructing difference of abstraction (427states) and FLOYD_HOARE automaton (currently 8 states, 87 states before enhancement),while ReachableStatesComputation was computing reachable states (15 states constructedinput type IntersectNwa). - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 23 locations, 1 error locations. TIMEOUT Result, 226.8s OverallTime, 84 OverallIterations, 42 TraceHistogramMax, 71.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 4423 SDtfs, 3605 SDslu, 44280 SDs, 0 SdLazy, 56756 SolverSat, 4225 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 35.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 40890 GetRequests, 33391 SyntacticMatches, 3564 SemanticMatches, 3935 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117250 ImplicationChecksByTransitivity, 151.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=427occurred in iteration=83, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.8s AutomataMinimizationTime, 83 MinimizatonAttempts, 5 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 1.0s SsaConstructionTime, 6.5s SatisfiabilityAnalysisTime, 140.9s InterpolantComputationTime, 36091 NumberOfCodeBlocks, 36091 NumberOfCodeBlocksAsserted, 766 NumberOfCheckSat, 53869 ConstructedInterpolants, 0 QuantifiedInterpolants, 33546233 SizeOfPredicates, 244 NumberOfNonLiveVariables, 38214 ConjunctsInSsa, 3846 ConjunctsInUnsatCore, 246 InterpolantComputations, 3 PerfectInterpolantSequences, 492937/704663 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown