java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data --generate-csv --csv-dir csv -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/ai/taipanbench/svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf -i ../../../trunk/examples/svcomp/loop-acceleration/diamond_true-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-69f5bdd-m [2018-09-18 09:56:35,074 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-18 09:56:35,076 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-18 09:56:35,088 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-18 09:56:35,088 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-18 09:56:35,089 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-18 09:56:35,091 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-18 09:56:35,092 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-18 09:56:35,094 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-18 09:56:35,095 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-18 09:56:35,096 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-18 09:56:35,096 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-18 09:56:35,097 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-18 09:56:35,098 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-18 09:56:35,100 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-18 09:56:35,102 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-18 09:56:35,103 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-18 09:56:35,105 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-18 09:56:35,107 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-18 09:56:35,109 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-18 09:56:35,110 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-18 09:56:35,112 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-18 09:56:35,114 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-09-18 09:56:35,115 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-09-18 09:56:35,115 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-09-18 09:56:35,116 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-09-18 09:56:35,121 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-09-18 09:56:35,121 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-09-18 09:56:35,122 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-09-18 09:56:35,127 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-09-18 09:56:35,127 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-09-18 09:56:35,128 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-09-18 09:56:35,137 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/taipanbench/svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf [2018-09-18 09:56:35,167 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-18 09:56:35,168 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-18 09:56:35,171 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-18 09:56:35,172 INFO L133 SettingsManager]: * User list type=DISABLED [2018-09-18 09:56:35,172 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-09-18 09:56:35,172 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-09-18 09:56:35,172 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-09-18 09:56:35,173 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-09-18 09:56:35,173 INFO L133 SettingsManager]: * Log string format=TERM [2018-09-18 09:56:35,173 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-09-18 09:56:35,173 INFO L133 SettingsManager]: * Parallel states before merging=1 [2018-09-18 09:56:35,173 INFO L133 SettingsManager]: * Interval Domain=false [2018-09-18 09:56:35,175 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-18 09:56:35,175 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-18 09:56:35,175 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-18 09:56:35,175 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-18 09:56:35,177 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-18 09:56:35,177 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-18 09:56:35,178 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-18 09:56:35,178 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-18 09:56:35,178 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-18 09:56:35,178 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-18 09:56:35,179 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-18 09:56:35,179 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-18 09:56:35,179 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-18 09:56:35,179 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-18 09:56:35,180 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-18 09:56:35,180 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-18 09:56:35,180 INFO L133 SettingsManager]: * Trace refinement strategy=RUBBER_TAIPAN [2018-09-18 09:56:35,180 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-18 09:56:35,180 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-18 09:56:35,181 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-18 09:56:35,181 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-09-18 09:56:35,181 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-09-18 09:56:35,226 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-18 09:56:35,246 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-18 09:56:35,250 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-18 09:56:35,252 INFO L271 PluginConnector]: Initializing CDTParser... [2018-09-18 09:56:35,252 INFO L276 PluginConnector]: CDTParser initialized [2018-09-18 09:56:35,254 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/diamond_true-unreach-call1_true-termination.i [2018-09-18 09:56:35,616 INFO L221 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e499fd9b3/8e85654ace1f48c5b4e96fdc5377a952/FLAG95def11ca [2018-09-18 09:56:35,743 INFO L277 CDTParser]: Found 1 translation units. [2018-09-18 09:56:35,744 INFO L159 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_true-unreach-call1_true-termination.i [2018-09-18 09:56:35,751 INFO L325 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e499fd9b3/8e85654ace1f48c5b4e96fdc5377a952/FLAG95def11ca [2018-09-18 09:56:35,767 INFO L333 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e499fd9b3/8e85654ace1f48c5b4e96fdc5377a952 [2018-09-18 09:56:35,777 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-18 09:56:35,781 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-09-18 09:56:35,782 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-09-18 09:56:35,782 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-09-18 09:56:35,789 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-09-18 09:56:35,790 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.09 09:56:35" (1/1) ... [2018-09-18 09:56:35,794 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@108b7f9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:35, skipping insertion in model container [2018-09-18 09:56:35,794 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.09 09:56:35" (1/1) ... [2018-09-18 09:56:35,807 INFO L160 ieTranslatorObserver]: Starting translation in SV-COMP mode [2018-09-18 09:56:36,073 INFO L170 PostProcessor]: Settings: Checked method=main [2018-09-18 09:56:36,095 INFO L424 MainDispatcher]: Starting main dispatcher in SV-COMP mode [2018-09-18 09:56:36,101 INFO L170 PostProcessor]: Settings: Checked method=main [2018-09-18 09:56:36,116 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:36 WrapperNode [2018-09-18 09:56:36,116 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-09-18 09:56:36,117 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-18 09:56:36,118 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-18 09:56:36,118 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-18 09:56:36,130 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:36" (1/1) ... [2018-09-18 09:56:36,136 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:36" (1/1) ... [2018-09-18 09:56:36,141 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-18 09:56:36,142 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-18 09:56:36,142 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-18 09:56:36,142 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-18 09:56:36,150 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:36" (1/1) ... [2018-09-18 09:56:36,150 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:36" (1/1) ... [2018-09-18 09:56:36,151 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:36" (1/1) ... [2018-09-18 09:56:36,152 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:36" (1/1) ... [2018-09-18 09:56:36,153 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:36" (1/1) ... [2018-09-18 09:56:36,158 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:36" (1/1) ... [2018-09-18 09:56:36,159 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:36" (1/1) ... [2018-09-18 09:56:36,161 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-18 09:56:36,161 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-18 09:56:36,162 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-18 09:56:36,162 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-18 09:56:36,163 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:36" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-18 09:56:36,238 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-09-18 09:56:36,239 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-09-18 09:56:36,239 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-18 09:56:36,239 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-18 09:56:36,239 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-09-18 09:56:36,240 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-09-18 09:56:36,240 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-09-18 09:56:36,240 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-09-18 09:56:36,699 INFO L356 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-18 09:56:36,699 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.09 09:56:36 BoogieIcfgContainer [2018-09-18 09:56:36,700 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-18 09:56:36,701 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-18 09:56:36,701 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-18 09:56:36,705 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-18 09:56:36,706 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.09 09:56:35" (1/3) ... [2018-09-18 09:56:36,707 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5bc40dd5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.09 09:56:36, skipping insertion in model container [2018-09-18 09:56:36,707 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:36" (2/3) ... [2018-09-18 09:56:36,707 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5bc40dd5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.09 09:56:36, skipping insertion in model container [2018-09-18 09:56:36,707 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.09 09:56:36" (3/3) ... [2018-09-18 09:56:36,709 INFO L112 eAbstractionObserver]: Analyzing ICFG diamond_true-unreach-call1_true-termination.i [2018-09-18 09:56:36,720 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-18 09:56:36,730 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-18 09:56:36,781 INFO L130 ementStrategyFactory]: Using default assertion order modulation [2018-09-18 09:56:36,782 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-18 09:56:36,783 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-18 09:56:36,783 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-18 09:56:36,783 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-18 09:56:36,783 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-18 09:56:36,783 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-18 09:56:36,783 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-18 09:56:36,783 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-18 09:56:36,800 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-09-18 09:56:36,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-18 09:56:36,806 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:56:36,808 INFO L376 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:56:36,809 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:56:36,815 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-09-18 09:56:36,818 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:56:36,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:36,867 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:56:36,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:36,867 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:56:36,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:36,925 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:36,927 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-18 09:56:36,927 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-18 09:56:36,928 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-18 09:56:36,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-09-18 09:56:36,944 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-09-18 09:56:36,945 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-09-18 09:56:36,947 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-09-18 09:56:36,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:56:36,970 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-09-18 09:56:36,970 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-09-18 09:56:36,972 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-09-18 09:56:36,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:56:36,982 INFO L225 Difference]: With dead ends: 30 [2018-09-18 09:56:36,982 INFO L226 Difference]: Without dead ends: 13 [2018-09-18 09:56:36,986 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-09-18 09:56:37,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-09-18 09:56:37,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-09-18 09:56:37,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-09-18 09:56:37,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-09-18 09:56:37,030 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-09-18 09:56:37,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:56:37,031 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-09-18 09:56:37,031 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-09-18 09:56:37,031 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-09-18 09:56:37,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-09-18 09:56:37,032 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:56:37,032 INFO L376 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:56:37,032 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:56:37,033 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-09-18 09:56:37,033 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:56:37,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:37,035 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:56:37,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:37,035 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:56:37,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:37,179 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:37,180 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-18 09:56:37,180 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-09-18 09:56:37,180 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-18 09:56:37,182 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-18 09:56:37,182 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-18 09:56:37,182 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-18 09:56:37,183 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-09-18 09:56:37,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:56:37,288 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2018-09-18 09:56:37,289 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-18 09:56:37,290 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-09-18 09:56:37,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:56:37,294 INFO L225 Difference]: With dead ends: 21 [2018-09-18 09:56:37,294 INFO L226 Difference]: Without dead ends: 16 [2018-09-18 09:56:37,296 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-18 09:56:37,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-09-18 09:56:37,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-09-18 09:56:37,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-18 09:56:37,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-09-18 09:56:37,306 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2018-09-18 09:56:37,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:56:37,306 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-09-18 09:56:37,307 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-18 09:56:37,307 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-09-18 09:56:37,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-18 09:56:37,308 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:56:37,308 INFO L376 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:56:37,309 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:56:37,309 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-09-18 09:56:37,310 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:56:37,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:37,311 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:56:37,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:37,312 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:56:37,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:37,521 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:37,521 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:37,522 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:56:37,538 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:56:37,539 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:56:37,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:37,580 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:37,671 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:37,671 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:37,915 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:37,937 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:37,937 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:56:37,954 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:56:37,954 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:56:37,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:37,978 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:38,006 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:38,006 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:38,060 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:38,065 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:56:38,066 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-09-18 09:56:38,066 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:56:38,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-18 09:56:38,067 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-18 09:56:38,067 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-09-18 09:56:38,068 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 4 states. [2018-09-18 09:56:38,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:56:38,228 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2018-09-18 09:56:38,229 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-18 09:56:38,230 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-09-18 09:56:38,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:56:38,230 INFO L225 Difference]: With dead ends: 24 [2018-09-18 09:56:38,231 INFO L226 Difference]: Without dead ends: 19 [2018-09-18 09:56:38,231 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-09-18 09:56:38,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-18 09:56:38,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2018-09-18 09:56:38,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-09-18 09:56:38,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-09-18 09:56:38,240 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-09-18 09:56:38,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:56:38,240 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-09-18 09:56:38,240 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-18 09:56:38,241 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-09-18 09:56:38,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-18 09:56:38,241 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:56:38,241 INFO L376 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:56:38,242 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:56:38,242 INFO L82 PathProgramCache]: Analyzing trace with hash -281914435, now seen corresponding path program 1 times [2018-09-18 09:56:38,242 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:56:38,243 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:38,243 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:56:38,243 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:38,244 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:56:38,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:38,482 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:38,482 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:38,483 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:56:38,502 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:56:38,503 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:56:38,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:38,524 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:38,564 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:38,564 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:38,636 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:38,657 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:38,658 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:56:38,674 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:56:38,674 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:56:38,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:38,694 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:38,720 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:38,720 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:38,738 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:38,741 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:56:38,741 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-09-18 09:56:38,741 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:56:38,742 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-18 09:56:38,742 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-18 09:56:38,742 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-09-18 09:56:38,743 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 4 states. [2018-09-18 09:56:38,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:56:38,829 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2018-09-18 09:56:38,830 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-18 09:56:38,830 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-09-18 09:56:38,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:56:38,832 INFO L225 Difference]: With dead ends: 26 [2018-09-18 09:56:38,832 INFO L226 Difference]: Without dead ends: 21 [2018-09-18 09:56:38,833 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-09-18 09:56:38,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-09-18 09:56:38,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2018-09-18 09:56:38,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-09-18 09:56:38,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-09-18 09:56:38,837 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-09-18 09:56:38,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:56:38,838 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-09-18 09:56:38,838 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-18 09:56:38,838 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-09-18 09:56:38,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-09-18 09:56:38,839 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:56:38,839 INFO L376 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:56:38,839 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:56:38,839 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-09-18 09:56:38,840 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:56:38,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:38,841 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:56:38,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:38,841 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:56:38,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:38,972 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:38,972 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:38,972 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:56:38,982 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:56:38,982 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:56:38,997 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:56:38,997 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:56:38,999 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:39,013 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:39,013 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:39,227 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:39,248 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:39,248 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:56:39,264 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:56:39,265 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:56:39,292 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:56:39,293 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:56:39,296 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:39,328 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:39,328 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:39,335 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:39,337 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:56:39,337 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-09-18 09:56:39,338 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:56:39,339 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-18 09:56:39,339 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-18 09:56:39,340 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-09-18 09:56:39,340 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2018-09-18 09:56:39,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:56:39,464 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2018-09-18 09:56:39,465 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-18 09:56:39,465 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-09-18 09:56:39,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:56:39,466 INFO L225 Difference]: With dead ends: 29 [2018-09-18 09:56:39,466 INFO L226 Difference]: Without dead ends: 24 [2018-09-18 09:56:39,467 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-09-18 09:56:39,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-09-18 09:56:39,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2018-09-18 09:56:39,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-18 09:56:39,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2018-09-18 09:56:39,473 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 17 [2018-09-18 09:56:39,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:56:39,473 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2018-09-18 09:56:39,473 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-18 09:56:39,473 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2018-09-18 09:56:39,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-09-18 09:56:39,474 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:56:39,474 INFO L376 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:56:39,475 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:56:39,475 INFO L82 PathProgramCache]: Analyzing trace with hash -849134272, now seen corresponding path program 1 times [2018-09-18 09:56:39,475 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:56:39,476 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:39,476 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:56:39,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:39,477 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:56:39,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:39,568 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:39,569 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:39,569 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:56:39,578 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:56:39,578 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:56:39,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:39,588 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:39,621 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:39,621 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:39,749 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:39,783 INFO L313 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-09-18 09:56:39,783 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 6 [2018-09-18 09:56:39,784 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-18 09:56:39,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-18 09:56:39,784 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-18 09:56:39,785 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-18 09:56:39,785 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand 3 states. [2018-09-18 09:56:39,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:56:39,844 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2018-09-18 09:56:39,846 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-18 09:56:39,846 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-09-18 09:56:39,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:56:39,849 INFO L225 Difference]: With dead ends: 35 [2018-09-18 09:56:39,849 INFO L226 Difference]: Without dead ends: 27 [2018-09-18 09:56:39,849 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-18 09:56:39,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-18 09:56:39,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-09-18 09:56:39,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-09-18 09:56:39,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2018-09-18 09:56:39,867 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 17 [2018-09-18 09:56:39,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:56:39,867 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2018-09-18 09:56:39,867 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-18 09:56:39,868 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2018-09-18 09:56:39,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-09-18 09:56:39,871 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:56:39,872 INFO L376 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:56:39,872 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:56:39,872 INFO L82 PathProgramCache]: Analyzing trace with hash 1277798652, now seen corresponding path program 2 times [2018-09-18 09:56:39,873 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:56:39,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:39,875 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:56:39,875 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:39,875 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:56:39,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:40,113 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:40,114 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:40,114 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:56:40,126 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:56:40,126 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:56:40,163 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:56:40,164 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:56:40,166 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:40,244 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:40,245 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:40,307 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:40,329 INFO L313 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-09-18 09:56:40,329 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 6 [2018-09-18 09:56:40,330 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-18 09:56:40,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-18 09:56:40,330 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-18 09:56:40,330 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-18 09:56:40,331 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 3 states. [2018-09-18 09:56:40,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:56:40,344 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-09-18 09:56:40,345 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-18 09:56:40,345 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-09-18 09:56:40,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:56:40,346 INFO L225 Difference]: With dead ends: 35 [2018-09-18 09:56:40,346 INFO L226 Difference]: Without dead ends: 27 [2018-09-18 09:56:40,347 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-18 09:56:40,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-18 09:56:40,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-09-18 09:56:40,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-09-18 09:56:40,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2018-09-18 09:56:40,353 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 17 [2018-09-18 09:56:40,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:56:40,353 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2018-09-18 09:56:40,353 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-18 09:56:40,353 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2018-09-18 09:56:40,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-09-18 09:56:40,354 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:56:40,354 INFO L376 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:56:40,355 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:56:40,355 INFO L82 PathProgramCache]: Analyzing trace with hash -1242161282, now seen corresponding path program 2 times [2018-09-18 09:56:40,355 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:56:40,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:40,356 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:56:40,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:40,356 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:56:40,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:40,749 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:40,749 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:40,749 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:56:40,765 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:56:40,766 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:56:40,804 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:56:40,804 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:56:40,806 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:40,815 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:40,815 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:40,905 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:40,926 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:40,927 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:56:40,946 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:56:40,947 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:56:40,970 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:56:40,971 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:56:40,974 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:40,992 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:40,993 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:41,029 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:41,032 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:56:41,032 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-09-18 09:56:41,032 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:56:41,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-18 09:56:41,033 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-18 09:56:41,034 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-09-18 09:56:41,034 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 5 states. [2018-09-18 09:56:41,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:56:41,240 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2018-09-18 09:56:41,241 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-18 09:56:41,241 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-09-18 09:56:41,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:56:41,242 INFO L225 Difference]: With dead ends: 35 [2018-09-18 09:56:41,242 INFO L226 Difference]: Without dead ends: 30 [2018-09-18 09:56:41,244 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-09-18 09:56:41,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-09-18 09:56:41,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-09-18 09:56:41,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-09-18 09:56:41,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2018-09-18 09:56:41,250 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 17 [2018-09-18 09:56:41,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:56:41,251 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2018-09-18 09:56:41,251 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-18 09:56:41,251 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2018-09-18 09:56:41,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-18 09:56:41,252 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:56:41,252 INFO L376 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:56:41,252 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:56:41,253 INFO L82 PathProgramCache]: Analyzing trace with hash 26004059, now seen corresponding path program 3 times [2018-09-18 09:56:41,253 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:56:41,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:41,254 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:56:41,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:41,254 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:56:41,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:41,344 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:41,345 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:41,345 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:56:41,352 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 09:56:41,353 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 09:56:41,371 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-18 09:56:41,371 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:56:41,373 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:41,382 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:41,383 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:41,505 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:41,526 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:41,527 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:56:41,543 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 09:56:41,543 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 09:56:41,604 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-18 09:56:41,605 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:56:41,608 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:41,628 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:41,628 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:41,645 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:41,650 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:56:41,650 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-09-18 09:56:41,650 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:56:41,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-18 09:56:41,651 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-18 09:56:41,651 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-09-18 09:56:41,652 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 6 states. [2018-09-18 09:56:41,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:56:41,747 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2018-09-18 09:56:41,751 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-18 09:56:41,751 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-09-18 09:56:41,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:56:41,752 INFO L225 Difference]: With dead ends: 38 [2018-09-18 09:56:41,752 INFO L226 Difference]: Without dead ends: 33 [2018-09-18 09:56:41,754 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-09-18 09:56:41,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-09-18 09:56:41,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-09-18 09:56:41,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-09-18 09:56:41,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2018-09-18 09:56:41,763 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 20 [2018-09-18 09:56:41,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:56:41,764 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2018-09-18 09:56:41,764 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-18 09:56:41,764 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2018-09-18 09:56:41,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-18 09:56:41,765 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:56:41,766 INFO L376 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:56:41,766 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:56:41,766 INFO L82 PathProgramCache]: Analyzing trace with hash 821178397, now seen corresponding path program 3 times [2018-09-18 09:56:41,766 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:56:41,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:41,767 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:56:41,768 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:41,768 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:56:41,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:41,902 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:41,902 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:41,903 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:56:41,911 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 09:56:41,911 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 09:57:05,972 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-18 09:57:05,972 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:05,974 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:05,989 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:05,989 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:06,097 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:06,101 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:06,101 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:57:06,117 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 09:57:06,117 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 09:57:32,140 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-18 09:57:32,140 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:32,144 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:32,156 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:32,156 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:32,174 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:32,184 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:57:32,184 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-09-18 09:57:32,185 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:57:32,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-18 09:57:32,185 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-18 09:57:32,185 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-09-18 09:57:32,186 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 6 states. [2018-09-18 09:57:32,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:57:32,254 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2018-09-18 09:57:32,255 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-18 09:57:32,255 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-09-18 09:57:32,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:57:32,256 INFO L225 Difference]: With dead ends: 41 [2018-09-18 09:57:32,256 INFO L226 Difference]: Without dead ends: 36 [2018-09-18 09:57:32,257 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-09-18 09:57:32,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-09-18 09:57:32,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-09-18 09:57:32,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-18 09:57:32,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2018-09-18 09:57:32,263 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 20 [2018-09-18 09:57:32,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:57:32,264 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2018-09-18 09:57:32,264 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-18 09:57:32,264 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2018-09-18 09:57:32,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-09-18 09:57:32,265 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:57:32,265 INFO L376 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:57:32,265 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:57:32,265 INFO L82 PathProgramCache]: Analyzing trace with hash 427509150, now seen corresponding path program 4 times [2018-09-18 09:57:32,266 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:57:32,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:32,267 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:57:32,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:32,267 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:57:32,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:57:32,725 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:32,726 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:32,726 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:57:32,734 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 09:57:32,734 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 09:57:32,746 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 09:57:32,746 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:32,748 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:32,778 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:32,778 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:33,423 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:33,444 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:33,444 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:57:33,460 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 09:57:33,460 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 09:57:33,485 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 09:57:33,485 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:33,489 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:33,496 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:33,496 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:33,530 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:33,532 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:57:33,532 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-09-18 09:57:33,532 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:57:33,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-18 09:57:33,533 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-18 09:57:33,533 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-09-18 09:57:33,533 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 7 states. [2018-09-18 09:57:33,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:57:33,631 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2018-09-18 09:57:33,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-18 09:57:33,636 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-09-18 09:57:33,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:57:33,637 INFO L225 Difference]: With dead ends: 44 [2018-09-18 09:57:33,637 INFO L226 Difference]: Without dead ends: 39 [2018-09-18 09:57:33,638 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 85 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-09-18 09:57:33,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-09-18 09:57:33,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-09-18 09:57:33,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-09-18 09:57:33,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-09-18 09:57:33,644 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 23 [2018-09-18 09:57:33,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:57:33,644 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-09-18 09:57:33,644 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-18 09:57:33,645 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-09-18 09:57:33,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-09-18 09:57:33,645 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:57:33,646 INFO L376 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:57:33,646 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:57:33,646 INFO L82 PathProgramCache]: Analyzing trace with hash 201615134, now seen corresponding path program 4 times [2018-09-18 09:57:33,646 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:57:33,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:33,647 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:57:33,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:33,648 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:57:33,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:57:34,112 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:34,113 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:34,113 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:57:34,121 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 09:57:34,122 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 09:57:34,135 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 09:57:34,135 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:34,137 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:34,167 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:34,167 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:34,684 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:34,704 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:34,705 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:57:34,721 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 09:57:34,721 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 09:57:34,746 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 09:57:34,746 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:34,749 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:34,768 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:34,768 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:34,820 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:34,827 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:57:34,827 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-09-18 09:57:34,827 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:57:34,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-18 09:57:34,828 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-18 09:57:34,828 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-09-18 09:57:34,829 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 7 states. [2018-09-18 09:57:34,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:57:34,974 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2018-09-18 09:57:34,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-18 09:57:34,977 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-09-18 09:57:34,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:57:34,979 INFO L225 Difference]: With dead ends: 47 [2018-09-18 09:57:34,979 INFO L226 Difference]: Without dead ends: 42 [2018-09-18 09:57:34,980 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 85 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-09-18 09:57:34,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-09-18 09:57:34,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-09-18 09:57:34,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-09-18 09:57:34,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2018-09-18 09:57:34,985 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 23 [2018-09-18 09:57:34,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:57:34,986 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2018-09-18 09:57:34,986 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-18 09:57:34,986 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2018-09-18 09:57:34,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-18 09:57:34,987 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:57:34,987 INFO L376 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:57:34,987 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:57:34,988 INFO L82 PathProgramCache]: Analyzing trace with hash 181755771, now seen corresponding path program 5 times [2018-09-18 09:57:34,988 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:57:34,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:34,990 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:57:34,991 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:34,991 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:57:34,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:57:35,203 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:35,203 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:35,203 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:57:35,212 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-18 09:57:35,213 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:57:35,290 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-18 09:57:35,290 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:35,292 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:35,359 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:35,359 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:35,838 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:35,858 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:35,859 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:57:35,876 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-18 09:57:35,876 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:57:35,939 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-18 09:57:35,939 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:35,943 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:35,981 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:35,982 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:36,030 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:36,032 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:57:36,032 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-09-18 09:57:36,032 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:57:36,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-18 09:57:36,033 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-18 09:57:36,033 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-09-18 09:57:36,033 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 8 states. [2018-09-18 09:57:36,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:57:36,176 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2018-09-18 09:57:36,176 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-18 09:57:36,177 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-09-18 09:57:36,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:57:36,177 INFO L225 Difference]: With dead ends: 50 [2018-09-18 09:57:36,178 INFO L226 Difference]: Without dead ends: 45 [2018-09-18 09:57:36,178 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-09-18 09:57:36,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-09-18 09:57:36,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-09-18 09:57:36,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-09-18 09:57:36,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2018-09-18 09:57:36,185 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 26 [2018-09-18 09:57:36,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:57:36,186 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2018-09-18 09:57:36,186 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-18 09:57:36,186 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2018-09-18 09:57:36,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-18 09:57:36,187 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:57:36,187 INFO L376 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:57:36,187 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:57:36,188 INFO L82 PathProgramCache]: Analyzing trace with hash -1733081987, now seen corresponding path program 5 times [2018-09-18 09:57:36,188 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:57:36,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:36,189 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:57:36,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:36,189 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:57:36,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:57:36,386 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:36,387 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:36,387 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:57:36,401 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-18 09:57:36,401 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:57:36,423 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-18 09:57:36,424 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:36,425 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:36,442 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:36,442 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:37,135 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:37,155 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:37,155 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:57:37,171 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-18 09:57:37,171 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:57:37,232 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-18 09:57:37,232 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:37,235 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:37,268 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:37,268 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:37,311 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:37,314 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:57:37,314 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-09-18 09:57:37,314 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:57:37,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-18 09:57:37,315 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-18 09:57:37,315 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-09-18 09:57:37,315 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 8 states. [2018-09-18 09:57:37,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:57:37,519 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2018-09-18 09:57:37,519 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-18 09:57:37,519 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-09-18 09:57:37,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:57:37,520 INFO L225 Difference]: With dead ends: 53 [2018-09-18 09:57:37,521 INFO L226 Difference]: Without dead ends: 48 [2018-09-18 09:57:37,521 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-09-18 09:57:37,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-09-18 09:57:37,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2018-09-18 09:57:37,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-09-18 09:57:37,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2018-09-18 09:57:37,528 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 26 [2018-09-18 09:57:37,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:57:37,528 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2018-09-18 09:57:37,528 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-18 09:57:37,528 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2018-09-18 09:57:37,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-09-18 09:57:37,529 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:57:37,529 INFO L376 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:57:37,530 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:57:37,530 INFO L82 PathProgramCache]: Analyzing trace with hash 1862081662, now seen corresponding path program 6 times [2018-09-18 09:57:37,530 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:57:37,531 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:37,531 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:57:37,531 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:37,531 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:57:37,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:57:37,657 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:37,658 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:37,658 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:57:37,666 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-18 09:57:37,666 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-18 09:57:37,685 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-18 09:57:37,686 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:37,687 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:37,707 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:37,707 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:38,399 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:38,421 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:38,421 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:57:38,440 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-18 09:57:38,441 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-18 09:57:38,562 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-18 09:57:38,563 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:38,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:38,575 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:38,576 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:38,583 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:38,585 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:57:38,585 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 16 [2018-09-18 09:57:38,585 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:57:38,585 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-18 09:57:38,586 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-18 09:57:38,586 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-09-18 09:57:38,586 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 9 states. [2018-09-18 09:57:38,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:57:38,719 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2018-09-18 09:57:38,720 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-18 09:57:38,720 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-09-18 09:57:38,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:57:38,721 INFO L225 Difference]: With dead ends: 56 [2018-09-18 09:57:38,721 INFO L226 Difference]: Without dead ends: 51 [2018-09-18 09:57:38,721 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 107 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-09-18 09:57:38,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-09-18 09:57:38,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2018-09-18 09:57:38,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-09-18 09:57:38,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2018-09-18 09:57:38,728 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 29 [2018-09-18 09:57:38,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:57:38,728 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2018-09-18 09:57:38,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-18 09:57:38,729 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2018-09-18 09:57:38,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-09-18 09:57:38,729 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:57:38,730 INFO L376 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:57:38,730 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:57:38,730 INFO L82 PathProgramCache]: Analyzing trace with hash 166098622, now seen corresponding path program 6 times [2018-09-18 09:57:38,730 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:57:38,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:38,731 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:57:38,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:38,732 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:57:38,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:57:38,892 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:38,892 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:38,892 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:57:38,905 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-18 09:57:38,905 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-18 09:57:38,938 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2018-09-18 09:57:38,939 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:38,940 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:39,944 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 39 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-09-18 09:57:39,945 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:58,279 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 28 proven. 11 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-09-18 09:57:58,300 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-09-18 09:57:58,301 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [9, 8] total 20 [2018-09-18 09:57:58,301 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-18 09:57:58,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-18 09:57:58,301 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-18 09:57:58,302 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=316, Unknown=2, NotChecked=0, Total=380 [2018-09-18 09:57:58,302 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 8 states. [2018-09-18 09:57:58,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:57:58,431 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-09-18 09:57:58,432 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-18 09:57:58,432 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2018-09-18 09:57:58,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:57:58,433 INFO L225 Difference]: With dead ends: 55 [2018-09-18 09:57:58,433 INFO L226 Difference]: Without dead ends: 33 [2018-09-18 09:57:58,434 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 19.0s TimeCoverageRelationStatistics Valid=75, Invalid=385, Unknown=2, NotChecked=0, Total=462 [2018-09-18 09:57:58,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-09-18 09:57:58,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-09-18 09:57:58,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-09-18 09:57:58,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-09-18 09:57:58,439 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 29 [2018-09-18 09:57:58,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:57:58,439 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-09-18 09:57:58,440 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-18 09:57:58,440 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-09-18 09:57:58,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-09-18 09:57:58,440 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:57:58,441 INFO L376 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:57:58,441 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:57:58,441 INFO L82 PathProgramCache]: Analyzing trace with hash -1688101733, now seen corresponding path program 7 times [2018-09-18 09:57:58,441 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:57:58,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:58,442 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:57:58,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:58,442 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:57:58,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:57:58,608 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:58,609 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:58,609 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:57:58,619 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:57:58,620 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:57:58,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:57:58,631 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:58,682 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:58,682 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:00,492 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:00,512 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:00,512 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 28 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:58:00,529 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:58:00,530 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:58:00,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:58:00,565 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:00,585 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:00,585 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:00,594 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:00,596 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:58:00,596 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-09-18 09:58:00,596 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:58:00,596 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-18 09:58:00,596 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-18 09:58:00,597 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-09-18 09:58:00,597 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 10 states. [2018-09-18 09:58:00,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:58:00,768 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-09-18 09:58:00,768 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-18 09:58:00,768 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-09-18 09:58:00,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:58:00,769 INFO L225 Difference]: With dead ends: 42 [2018-09-18 09:58:00,770 INFO L226 Difference]: Without dead ends: 37 [2018-09-18 09:58:00,770 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 118 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-09-18 09:58:00,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-09-18 09:58:00,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2018-09-18 09:58:00,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-09-18 09:58:00,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-09-18 09:58:00,777 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 32 [2018-09-18 09:58:00,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:58:00,777 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-09-18 09:58:00,777 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-18 09:58:00,777 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-09-18 09:58:00,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-09-18 09:58:00,778 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:58:00,778 INFO L376 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:58:00,779 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:58:00,779 INFO L82 PathProgramCache]: Analyzing trace with hash -1631958178, now seen corresponding path program 8 times [2018-09-18 09:58:00,779 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:58:00,780 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:00,780 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:58:00,780 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:00,780 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:58:00,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:58:00,937 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:00,938 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:00,938 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:58:00,945 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:58:00,946 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:58:00,961 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:58:00,961 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:58:00,963 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:00,993 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:00,993 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:03,311 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:03,332 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:03,332 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 30 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:58:03,348 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:58:03,348 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:58:03,382 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:58:03,383 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:58:03,386 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:03,409 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:03,409 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:03,432 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:03,434 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:58:03,434 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-09-18 09:58:03,434 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:58:03,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-18 09:58:03,435 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-18 09:58:03,435 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-09-18 09:58:03,435 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 11 states. [2018-09-18 09:58:03,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:58:03,650 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-09-18 09:58:03,653 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-18 09:58:03,653 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-09-18 09:58:03,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:58:03,654 INFO L225 Difference]: With dead ends: 45 [2018-09-18 09:58:03,654 INFO L226 Difference]: Without dead ends: 40 [2018-09-18 09:58:03,654 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 129 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-09-18 09:58:03,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-09-18 09:58:03,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-09-18 09:58:03,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-18 09:58:03,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-09-18 09:58:03,658 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 35 [2018-09-18 09:58:03,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:58:03,658 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-09-18 09:58:03,659 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-18 09:58:03,659 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-09-18 09:58:03,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-09-18 09:58:03,659 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:58:03,659 INFO L376 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:58:03,660 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:58:03,660 INFO L82 PathProgramCache]: Analyzing trace with hash 198410683, now seen corresponding path program 9 times [2018-09-18 09:58:03,660 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:58:03,661 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:03,661 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:58:03,661 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:03,661 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:58:03,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:58:03,881 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:03,881 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:03,881 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:58:03,889 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 09:58:03,890 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 09:58:04,732 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-18 09:58:04,732 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:58:04,740 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:04,760 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:04,760 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:06,214 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:06,235 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:06,235 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 32 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:58:06,254 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 09:58:06,254 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 09:58:06,486 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-18 09:58:06,486 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:58:06,490 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:06,499 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:06,499 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:06,509 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:06,511 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:58:06,511 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 22 [2018-09-18 09:58:06,511 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:58:06,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-18 09:58:06,512 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-18 09:58:06,512 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-09-18 09:58:06,513 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 12 states. [2018-09-18 09:58:06,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:58:06,752 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-09-18 09:58:06,752 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-18 09:58:06,752 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-09-18 09:58:06,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:58:06,754 INFO L225 Difference]: With dead ends: 48 [2018-09-18 09:58:06,754 INFO L226 Difference]: Without dead ends: 43 [2018-09-18 09:58:06,755 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 140 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-09-18 09:58:06,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-09-18 09:58:06,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-09-18 09:58:06,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-09-18 09:58:06,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-09-18 09:58:06,761 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 38 [2018-09-18 09:58:06,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:58:06,762 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-09-18 09:58:06,762 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-18 09:58:06,762 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-09-18 09:58:06,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-09-18 09:58:06,763 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:58:06,763 INFO L376 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:58:06,763 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:58:06,763 INFO L82 PathProgramCache]: Analyzing trace with hash -187641282, now seen corresponding path program 10 times [2018-09-18 09:58:06,763 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:58:06,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:06,764 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:58:06,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:06,765 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:58:06,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:58:07,054 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:07,055 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:07,055 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:58:07,062 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 09:58:07,062 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 09:58:07,077 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 09:58:07,077 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:58:07,079 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:07,127 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:07,128 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:09,446 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:09,466 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:09,466 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 34 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:58:09,482 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 09:58:09,482 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 09:58:09,514 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 09:58:09,514 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:58:09,518 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:09,530 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:09,531 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:09,551 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:09,553 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:58:09,553 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-09-18 09:58:09,553 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:58:09,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-18 09:58:09,553 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-18 09:58:09,554 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-09-18 09:58:09,554 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 13 states. [2018-09-18 09:58:09,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:58:09,820 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-09-18 09:58:09,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-18 09:58:09,820 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-09-18 09:58:09,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:58:09,821 INFO L225 Difference]: With dead ends: 51 [2018-09-18 09:58:09,822 INFO L226 Difference]: Without dead ends: 46 [2018-09-18 09:58:09,822 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 151 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-09-18 09:58:09,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-09-18 09:58:09,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-09-18 09:58:09,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-09-18 09:58:09,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-09-18 09:58:09,827 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 41 [2018-09-18 09:58:09,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:58:09,827 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-09-18 09:58:09,827 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-18 09:58:09,827 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-09-18 09:58:09,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-09-18 09:58:09,828 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:58:09,828 INFO L376 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:58:09,828 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:58:09,828 INFO L82 PathProgramCache]: Analyzing trace with hash 860688091, now seen corresponding path program 11 times [2018-09-18 09:58:09,828 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:58:09,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:09,829 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:58:09,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:09,829 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:58:09,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:58:10,636 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:10,637 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:10,637 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:58:10,644 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-18 09:58:10,644 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:58:11,178 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-18 09:58:11,178 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:58:11,185 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:11,202 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:11,202 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:15,074 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:15,096 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:15,096 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 36 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:58:15,114 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-18 09:58:15,114 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:58:15,303 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-18 09:58:15,303 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:58:15,306 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:15,331 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:15,332 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:15,395 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:15,400 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:58:15,400 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 26 [2018-09-18 09:58:15,400 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:58:15,401 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-18 09:58:15,401 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-18 09:58:15,401 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-09-18 09:58:15,402 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 14 states. [2018-09-18 09:58:15,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:58:15,675 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-09-18 09:58:15,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-18 09:58:15,675 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-09-18 09:58:15,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:58:15,676 INFO L225 Difference]: With dead ends: 54 [2018-09-18 09:58:15,677 INFO L226 Difference]: Without dead ends: 49 [2018-09-18 09:58:15,677 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 162 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-09-18 09:58:15,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-09-18 09:58:15,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2018-09-18 09:58:15,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-09-18 09:58:15,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-09-18 09:58:15,682 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 44 [2018-09-18 09:58:15,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:58:15,682 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-09-18 09:58:15,682 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-18 09:58:15,683 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-09-18 09:58:15,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-09-18 09:58:15,683 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:58:15,683 INFO L376 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:58:15,683 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:58:15,684 INFO L82 PathProgramCache]: Analyzing trace with hash -1361137378, now seen corresponding path program 12 times [2018-09-18 09:58:15,684 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:58:15,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:15,685 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:58:15,685 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:15,685 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:58:15,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:58:17,242 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:17,242 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:17,243 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:58:17,251 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-18 09:58:17,252 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-18 09:58:19,917 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-18 09:58:19,917 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:58:19,920 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:19,949 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:19,949 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:24,969 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:24,990 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:24,990 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 38 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:58:25,006 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-18 09:58:25,007 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-18 09:58:25,367 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-18 09:58:25,368 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:58:25,371 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:25,395 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:25,395 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:25,406 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:25,407 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:58:25,408 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-09-18 09:58:25,408 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:58:25,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-18 09:58:25,409 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-18 09:58:25,409 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-09-18 09:58:25,410 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 15 states. [2018-09-18 09:58:25,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:58:25,859 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-09-18 09:58:25,862 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-18 09:58:25,862 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-09-18 09:58:25,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:58:25,863 INFO L225 Difference]: With dead ends: 57 [2018-09-18 09:58:25,863 INFO L226 Difference]: Without dead ends: 52 [2018-09-18 09:58:25,863 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 173 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-09-18 09:58:25,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-09-18 09:58:25,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2018-09-18 09:58:25,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-09-18 09:58:25,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-09-18 09:58:25,869 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 47 [2018-09-18 09:58:25,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:58:25,869 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-09-18 09:58:25,869 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-18 09:58:25,870 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-09-18 09:58:25,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-09-18 09:58:25,870 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:58:25,870 INFO L376 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:58:25,871 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:58:25,871 INFO L82 PathProgramCache]: Analyzing trace with hash -2022685701, now seen corresponding path program 13 times [2018-09-18 09:58:25,871 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:58:25,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:25,872 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:58:25,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:25,872 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:58:25,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:58:26,498 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:26,498 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:26,499 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:58:26,509 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:58:26,510 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:58:26,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:58:26,526 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:26,536 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:26,536 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:30,403 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:30,424 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:30,424 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 40 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:58:30,439 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:58:30,440 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:58:30,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:58:30,481 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:30,491 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:30,492 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:30,499 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:30,501 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:58:30,501 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-09-18 09:58:30,501 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:58:30,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-18 09:58:30,501 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-18 09:58:30,502 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-09-18 09:58:30,502 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 16 states. [2018-09-18 09:58:30,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:58:30,916 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-09-18 09:58:30,917 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-18 09:58:30,917 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-09-18 09:58:30,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:58:30,918 INFO L225 Difference]: With dead ends: 60 [2018-09-18 09:58:30,918 INFO L226 Difference]: Without dead ends: 55 [2018-09-18 09:58:30,919 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 184 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-09-18 09:58:30,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-09-18 09:58:30,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-09-18 09:58:30,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-09-18 09:58:30,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-09-18 09:58:30,922 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 50 [2018-09-18 09:58:30,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:58:30,922 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-09-18 09:58:30,922 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-18 09:58:30,923 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-09-18 09:58:30,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-09-18 09:58:30,923 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:58:30,923 INFO L376 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:58:30,924 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:58:30,924 INFO L82 PathProgramCache]: Analyzing trace with hash -603854850, now seen corresponding path program 14 times [2018-09-18 09:58:30,924 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:58:30,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:30,926 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:58:30,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:30,926 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:58:30,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:58:31,516 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:31,516 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:31,516 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:58:31,534 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:58:31,534 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:58:31,577 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:58:31,578 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:58:31,580 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:31,615 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:31,615 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:39,556 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:39,577 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:39,577 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 42 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:58:39,593 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:58:39,593 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:58:39,642 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:58:39,643 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:58:39,646 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:39,671 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:39,672 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:39,680 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:39,681 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:58:39,682 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 32 [2018-09-18 09:58:39,682 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:58:39,682 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-18 09:58:39,682 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-18 09:58:39,683 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=705, Unknown=1, NotChecked=0, Total=992 [2018-09-18 09:58:39,683 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 17 states. [2018-09-18 09:58:40,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:58:40,425 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-09-18 09:58:40,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-18 09:58:40,426 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-09-18 09:58:40,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:58:40,427 INFO L225 Difference]: With dead ends: 63 [2018-09-18 09:58:40,427 INFO L226 Difference]: Without dead ends: 58 [2018-09-18 09:58:40,428 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 195 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=286, Invalid=705, Unknown=1, NotChecked=0, Total=992 [2018-09-18 09:58:40,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-09-18 09:58:40,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-09-18 09:58:40,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-09-18 09:58:40,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-09-18 09:58:40,431 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 53 [2018-09-18 09:58:40,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:58:40,432 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-09-18 09:58:40,432 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-18 09:58:40,432 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-09-18 09:58:40,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-09-18 09:58:40,432 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:58:40,432 INFO L376 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:58:40,433 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:58:40,433 INFO L82 PathProgramCache]: Analyzing trace with hash 1012867355, now seen corresponding path program 15 times [2018-09-18 09:58:40,433 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:58:40,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:40,433 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:58:40,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:40,434 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:58:40,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:58:40,762 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:40,762 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:40,762 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:58:40,771 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 09:58:40,771 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 09:59:56,986 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-18 09:59:56,986 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:58,068 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:58,107 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:58,107 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:59,594 WARN L178 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-18 10:00:00,366 WARN L178 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-18 10:00:02,910 WARN L178 SmtUtils]: Spent 853.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-18 10:00:05,784 WARN L178 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-18 10:00:06,012 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:00:06,023 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 10:00:06,023 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 44 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 10:00:06,044 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 10:00:06,044 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 10:00:06,559 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-18 10:00:06,559 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 10:00:06,563 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 10:00:06,582 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:00:06,582 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 10:00:21,390 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:00:21,392 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 10:00:21,392 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 19, 18, 18] total 47 [2018-09-18 10:00:21,392 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 10:00:21,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-18 10:00:21,393 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-18 10:00:21,394 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=646, Invalid=1516, Unknown=0, NotChecked=0, Total=2162 [2018-09-18 10:00:21,394 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 18 states. [2018-09-18 10:00:21,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 10:00:21,803 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-09-18 10:00:21,805 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-18 10:00:21,805 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-09-18 10:00:21,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 10:00:21,806 INFO L225 Difference]: With dead ends: 66 [2018-09-18 10:00:21,806 INFO L226 Difference]: Without dead ends: 61 [2018-09-18 10:00:21,807 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 192 SyntacticMatches, 4 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 22.9s TimeCoverageRelationStatistics Valid=646, Invalid=1516, Unknown=0, NotChecked=0, Total=2162 [2018-09-18 10:00:21,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-09-18 10:00:21,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2018-09-18 10:00:21,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-09-18 10:00:21,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-09-18 10:00:21,810 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 56 [2018-09-18 10:00:21,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 10:00:21,811 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-09-18 10:00:21,811 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-18 10:00:21,811 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-09-18 10:00:21,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-09-18 10:00:21,812 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 10:00:21,812 INFO L376 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 10:00:21,812 INFO L423 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 10:00:21,812 INFO L82 PathProgramCache]: Analyzing trace with hash 1020819166, now seen corresponding path program 16 times [2018-09-18 10:00:21,812 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 10:00:21,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 10:00:21,814 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 10:00:21,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 10:00:21,814 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 10:00:21,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 10:00:22,438 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:00:22,439 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 10:00:22,439 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 10:00:22,446 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 10:00:22,446 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 10:00:22,466 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 10:00:22,466 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 10:00:22,468 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 10:00:22,478 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:00:22,478 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 10:00:30,415 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:00:30,435 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 10:00:30,435 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 46 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 10:00:30,450 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 10:00:30,450 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 10:00:30,501 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 10:00:30,501 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 10:00:30,505 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 10:00:30,543 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:00:30,543 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 10:00:30,556 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:00:30,557 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 10:00:30,557 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 36 [2018-09-18 10:00:30,557 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 10:00:30,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-18 10:00:30,558 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-18 10:00:30,559 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-09-18 10:00:30,559 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 19 states. [2018-09-18 10:00:30,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 10:00:30,990 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-09-18 10:00:30,991 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-18 10:00:30,991 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-09-18 10:00:30,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 10:00:30,992 INFO L225 Difference]: With dead ends: 69 [2018-09-18 10:00:30,992 INFO L226 Difference]: Without dead ends: 64 [2018-09-18 10:00:30,993 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 217 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-09-18 10:00:30,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-09-18 10:00:30,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2018-09-18 10:00:30,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-09-18 10:00:30,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-09-18 10:00:30,996 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 59 [2018-09-18 10:00:30,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 10:00:30,997 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-09-18 10:00:30,997 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-18 10:00:30,997 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-09-18 10:00:30,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-09-18 10:00:30,997 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 10:00:30,997 INFO L376 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 10:00:30,998 INFO L423 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 10:00:30,998 INFO L82 PathProgramCache]: Analyzing trace with hash 1690019387, now seen corresponding path program 17 times [2018-09-18 10:00:30,998 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 10:00:30,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 10:00:30,998 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 10:00:30,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 10:00:30,999 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 10:00:31,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 10:00:31,296 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:00:31,297 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 10:00:31,297 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 10:00:31,305 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-18 10:00:31,305 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 10:00:57,185 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-09-18 10:00:57,185 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 10:00:57,218 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 10:00:57,249 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:00:57,249 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 10:01:11,126 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:11,148 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 10:01:11,148 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 48 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 10:01:11,166 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-18 10:01:11,166 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 10:01:11,612 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-09-18 10:01:11,612 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 10:01:11,616 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 10:01:11,652 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:11,652 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 10:01:11,702 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:11,704 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 10:01:11,704 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 38 [2018-09-18 10:01:11,705 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 10:01:11,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-18 10:01:11,705 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-18 10:01:11,706 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1008, Unknown=1, NotChecked=0, Total=1406 [2018-09-18 10:01:11,706 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 20 states. [2018-09-18 10:01:12,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 10:01:12,356 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-09-18 10:01:12,356 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-18 10:01:12,356 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-09-18 10:01:12,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 10:01:12,357 INFO L225 Difference]: With dead ends: 72 [2018-09-18 10:01:12,358 INFO L226 Difference]: Without dead ends: 67 [2018-09-18 10:01:12,359 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 228 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=397, Invalid=1008, Unknown=1, NotChecked=0, Total=1406 [2018-09-18 10:01:12,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-09-18 10:01:12,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2018-09-18 10:01:12,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-09-18 10:01:12,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-09-18 10:01:12,362 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 62 [2018-09-18 10:01:12,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 10:01:12,362 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-09-18 10:01:12,363 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-18 10:01:12,363 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-09-18 10:01:12,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-09-18 10:01:12,363 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 10:01:12,363 INFO L376 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 10:01:12,363 INFO L423 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 10:01:12,364 INFO L82 PathProgramCache]: Analyzing trace with hash 595615166, now seen corresponding path program 18 times [2018-09-18 10:01:12,364 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 10:01:12,364 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 10:01:12,364 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 10:01:12,365 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 10:01:12,365 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 10:01:12,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 10:01:13,884 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:13,884 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 10:01:13,884 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-09-18 10:01:13,892 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-18 10:01:13,892 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) Received shutdown request... [2018-09-18 10:01:18,608 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-09-18 10:01:18,608 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 10:01:18,619 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 10:01:18,621 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-09-18 10:01:18,822 WARN L521 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 10:01:18,822 WARN L549 AbstractCegarLoop]: Verification canceled [2018-09-18 10:01:18,828 WARN L206 ceAbstractionStarter]: Timeout [2018-09-18 10:01:18,828 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.09 10:01:18 BoogieIcfgContainer [2018-09-18 10:01:18,828 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-09-18 10:01:18,829 INFO L168 Benchmark]: Toolchain (without parser) took 283051.18 ms. Allocated memory was 1.5 GB in the beginning and 2.5 GB in the end (delta: 957.3 MB). Free memory was 1.4 GB in the beginning and 2.0 GB in the end (delta: -570.3 MB). Peak memory consumption was 387.0 MB. Max. memory is 7.1 GB. [2018-09-18 10:01:18,830 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-09-18 10:01:18,830 INFO L168 Benchmark]: CACSL2BoogieTranslator took 334.94 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. [2018-09-18 10:01:18,831 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.11 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. [2018-09-18 10:01:18,831 INFO L168 Benchmark]: Boogie Preprocessor took 19.41 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. [2018-09-18 10:01:18,832 INFO L168 Benchmark]: RCFGBuilder took 538.24 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 724.6 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -774.7 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. [2018-09-18 10:01:18,832 INFO L168 Benchmark]: TraceAbstraction took 282127.76 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 232.8 MB). Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 193.8 MB). Peak memory consumption was 426.6 MB. Max. memory is 7.1 GB. [2018-09-18 10:01:18,837 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 334.94 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 24.11 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 19.41 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 538.24 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 724.6 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -774.7 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 282127.76 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 232.8 MB). Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 193.8 MB). Peak memory consumption was 426.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 66 with TraceHistMax 19, while TraceCheckSpWp was constructing forward predicates, while PredicateComparison was comparing new predicate (quantifier-free) to 21 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. TIMEOUT Result, 282.0s OverallTime, 28 OverallIterations, 19 TraceHistogramMax, 6.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 488 SDtfs, 29 SDslu, 3602 SDs, 0 SdLazy, 4921 SolverSat, 6 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 3349 GetRequests, 2853 SyntacticMatches, 74 SemanticMatches, 422 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 104.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=66occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 27 MinimizatonAttempts, 29 StatesRemovedByMinimization, 25 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 159.2s SatisfiabilityAnalysisTime, 108.2s InterpolantComputationTime, 2385 NumberOfCodeBlocks, 2373 NumberOfCodeBlocksAsserted, 265 NumberOfCheckSat, 3819 ConstructedInterpolants, 0 QuantifiedInterpolants, 862485 SizeOfPredicates, 52 NumberOfNonLiveVariables, 3193 ConjunctsInSsa, 820 ConjunctsInUnsatCore, 121 InterpolantComputations, 7 PerfectInterpolantSequences, 131/14433 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Written .csv to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/csv/diamond_true-unreach-call1_true-termination.i_svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf_AutomizerCInline.xml/Csv-Benchmark-0-2018-09-18_10-01-18-856.csv Written .csv to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/csv/diamond_true-unreach-call1_true-termination.i_svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf_AutomizerCInline.xml/Csv-TraceAbstractionBenchmarks-0-2018-09-18_10-01-18-856.csv Completed graceful shutdown