java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/functions_false-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 04:06:05,126 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 04:06:05,128 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 04:06:05,140 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 04:06:05,140 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 04:06:05,141 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 04:06:05,143 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 04:06:05,144 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 04:06:05,146 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 04:06:05,147 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 04:06:05,148 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 04:06:05,148 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 04:06:05,149 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 04:06:05,150 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 04:06:05,151 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 04:06:05,152 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 04:06:05,153 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 04:06:05,156 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 04:06:05,160 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 04:06:05,164 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 04:06:05,165 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 04:06:05,166 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 04:06:05,172 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-27 04:06:05,185 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-27 04:06:05,200 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 04:06:05,201 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 04:06:05,201 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 04:06:05,202 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 04:06:05,202 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 04:06:05,202 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 04:06:05,202 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 04:06:05,202 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 04:06:05,203 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 04:06:05,203 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 04:06:05,203 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 04:06:05,203 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 04:06:05,204 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 04:06:05,204 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 04:06:05,204 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 04:06:05,204 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 04:06:05,205 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 04:06:05,205 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 04:06:05,205 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 04:06:05,205 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 04:06:05,205 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 04:06:05,206 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 04:06:05,206 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 04:06:05,206 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 04:06:05,206 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 04:06:05,206 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 04:06:05,207 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 04:06:05,207 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 04:06:05,207 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 04:06:05,207 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 04:06:05,207 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 04:06:05,208 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 04:06:05,208 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 04:06:05,208 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 04:06:05,249 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 04:06:05,261 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 04:06:05,265 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 04:06:05,266 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 04:06:05,267 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 04:06:05,268 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/functions_false-unreach-call1_true-termination.i [2018-10-27 04:06:05,331 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/4b2853df3/44dddc28b5814a0180c8eef494236f76/FLAG886756a62 [2018-10-27 04:06:05,819 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 04:06:05,820 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/functions_false-unreach-call1_true-termination.i [2018-10-27 04:06:05,831 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/4b2853df3/44dddc28b5814a0180c8eef494236f76/FLAG886756a62 [2018-10-27 04:06:05,849 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/4b2853df3/44dddc28b5814a0180c8eef494236f76 [2018-10-27 04:06:05,859 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 04:06:05,860 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 04:06:05,861 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 04:06:05,862 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 04:06:05,865 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 04:06:05,866 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 04:06:05" (1/1) ... [2018-10-27 04:06:05,869 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3fad5e17 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:05, skipping insertion in model container [2018-10-27 04:06:05,869 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 04:06:05" (1/1) ... [2018-10-27 04:06:05,880 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 04:06:05,904 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 04:06:06,081 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 04:06:06,085 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 04:06:06,101 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 04:06:06,117 INFO L193 MainTranslator]: Completed translation [2018-10-27 04:06:06,117 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:06 WrapperNode [2018-10-27 04:06:06,118 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 04:06:06,119 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 04:06:06,119 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 04:06:06,119 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 04:06:06,130 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:06" (1/1) ... [2018-10-27 04:06:06,136 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:06" (1/1) ... [2018-10-27 04:06:06,142 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 04:06:06,142 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 04:06:06,142 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 04:06:06,143 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 04:06:06,152 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:06" (1/1) ... [2018-10-27 04:06:06,153 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:06" (1/1) ... [2018-10-27 04:06:06,153 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:06" (1/1) ... [2018-10-27 04:06:06,154 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:06" (1/1) ... [2018-10-27 04:06:06,157 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:06" (1/1) ... [2018-10-27 04:06:06,162 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:06" (1/1) ... [2018-10-27 04:06:06,163 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:06" (1/1) ... [2018-10-27 04:06:06,164 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 04:06:06,165 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 04:06:06,165 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 04:06:06,165 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 04:06:06,166 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:06" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 04:06:06,291 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 04:06:06,291 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 04:06:06,291 INFO L130 BoogieDeclarations]: Found specification of procedure f [2018-10-27 04:06:06,292 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2018-10-27 04:06:06,292 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 04:06:06,292 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 04:06:06,292 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 04:06:06,292 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 04:06:06,292 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 04:06:06,293 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 04:06:06,472 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 04:06:06,472 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 04:06:06 BoogieIcfgContainer [2018-10-27 04:06:06,473 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 04:06:06,474 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 04:06:06,474 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 04:06:06,477 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 04:06:06,477 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 04:06:05" (1/3) ... [2018-10-27 04:06:06,478 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f80b1fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 04:06:06, skipping insertion in model container [2018-10-27 04:06:06,478 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:06" (2/3) ... [2018-10-27 04:06:06,479 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f80b1fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 04:06:06, skipping insertion in model container [2018-10-27 04:06:06,479 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 04:06:06" (3/3) ... [2018-10-27 04:06:06,481 INFO L112 eAbstractionObserver]: Analyzing ICFG functions_false-unreach-call1_true-termination.i [2018-10-27 04:06:06,492 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 04:06:06,500 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 04:06:06,538 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 04:06:06,597 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 04:06:06,597 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 04:06:06,597 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 04:06:06,597 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 04:06:06,597 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 04:06:06,598 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 04:06:06,598 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 04:06:06,598 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 04:06:06,621 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2018-10-27 04:06:06,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-27 04:06:06,629 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:06,630 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:06,633 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:06,640 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:06,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1196028990, now seen corresponding path program 1 times [2018-10-27 04:06:06,643 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:06,712 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:06,713 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:06,713 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:06,713 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:06,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:06,768 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:06,770 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 04:06:06,770 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 04:06:06,770 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:06:06,774 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 04:06:06,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 04:06:06,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 04:06:06,789 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 2 states. [2018-10-27 04:06:06,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:06,812 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-27 04:06:06,813 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 04:06:06,814 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-27 04:06:06,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:06,824 INFO L225 Difference]: With dead ends: 34 [2018-10-27 04:06:06,824 INFO L226 Difference]: Without dead ends: 17 [2018-10-27 04:06:06,828 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 04:06:06,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-10-27 04:06:06,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-10-27 04:06:06,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-27 04:06:06,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-27 04:06:06,869 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 10 [2018-10-27 04:06:06,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:06,870 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-27 04:06:06,870 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 04:06:06,870 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-27 04:06:06,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-27 04:06:06,871 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:06,871 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:06,872 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:06,872 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:06,873 INFO L82 PathProgramCache]: Analyzing trace with hash -1888530020, now seen corresponding path program 1 times [2018-10-27 04:06:06,873 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:06,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:06,874 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:06,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:06,875 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:06,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:06,997 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:06,998 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 04:06:06,998 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 04:06:06,998 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:06:07,000 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 04:06:07,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 04:06:07,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 04:06:07,001 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 3 states. [2018-10-27 04:06:07,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:07,025 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2018-10-27 04:06:07,027 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 04:06:07,027 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-27 04:06:07,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:07,030 INFO L225 Difference]: With dead ends: 26 [2018-10-27 04:06:07,030 INFO L226 Difference]: Without dead ends: 21 [2018-10-27 04:06:07,031 INFO L605 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 [2018-10-27 04:06:07,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-27 04:06:07,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2018-10-27 04:06:07,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-27 04:06:07,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-10-27 04:06:07,043 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 11 [2018-10-27 04:06:07,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:07,043 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-10-27 04:06:07,044 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 04:06:07,044 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-10-27 04:06:07,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-27 04:06:07,045 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:07,045 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:07,045 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:07,046 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:07,046 INFO L82 PathProgramCache]: Analyzing trace with hash 1261609818, now seen corresponding path program 1 times [2018-10-27 04:06:07,046 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:07,050 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:07,050 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:07,050 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:07,051 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:07,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:07,291 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:07,292 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:07,292 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:07,293 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-27 04:06:07,295 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [6], [10], [14], [16], [18], [24], [27], [29], [35], [36], [37], [39], [40], [41] [2018-10-27 04:06:07,358 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-27 04:06:07,358 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 04:06:07,466 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-27 04:06:07,976 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 04:06:07,977 INFO L272 AbstractInterpreter]: Visited 17 different actions 133 times. Merged at 5 different actions 49 times. Widened at 1 different actions 6 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-27 04:06:07,989 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:07,990 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 04:06:07,991 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:07,991 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:08,002 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:08,002 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:08,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:08,028 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:08,105 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:08,106 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:08,460 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 04:06:08,668 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:08,692 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:08,692 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-27 04:06:08,692 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:08,693 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 04:06:08,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 04:06:08,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2018-10-27 04:06:08,694 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 6 states. [2018-10-27 04:06:08,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:08,807 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-10-27 04:06:08,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-27 04:06:08,808 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2018-10-27 04:06:08,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:08,809 INFO L225 Difference]: With dead ends: 30 [2018-10-27 04:06:08,809 INFO L226 Difference]: Without dead ends: 25 [2018-10-27 04:06:08,810 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 30 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2018-10-27 04:06:08,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-27 04:06:08,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2018-10-27 04:06:08,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-27 04:06:08,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-10-27 04:06:08,817 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2018-10-27 04:06:08,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:08,818 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-10-27 04:06:08,818 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 04:06:08,818 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-10-27 04:06:08,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-27 04:06:08,822 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:08,823 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:08,823 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:08,823 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:08,823 INFO L82 PathProgramCache]: Analyzing trace with hash -1235124260, now seen corresponding path program 2 times [2018-10-27 04:06:08,824 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:08,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:08,826 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:08,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:08,826 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:08,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:09,181 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-27 04:06:09,181 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:09,181 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:09,182 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:09,182 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:09,182 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:09,182 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:09,200 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:09,200 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:09,322 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 04:06:09,322 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:09,326 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:09,459 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-27 04:06:09,459 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:12,412 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-27 04:06:12,434 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:12,435 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 12] total 18 [2018-10-27 04:06:12,435 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:12,435 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 04:06:12,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 04:06:12,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=254, Unknown=1, NotChecked=0, Total=306 [2018-10-27 04:06:12,437 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 8 states. [2018-10-27 04:06:12,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:12,597 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-27 04:06:12,597 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 04:06:12,598 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2018-10-27 04:06:12,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:12,599 INFO L225 Difference]: With dead ends: 34 [2018-10-27 04:06:12,599 INFO L226 Difference]: Without dead ends: 29 [2018-10-27 04:06:12,600 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 36 SyntacticMatches, 7 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=69, Invalid=310, Unknown=1, NotChecked=0, Total=380 [2018-10-27 04:06:12,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-27 04:06:12,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2018-10-27 04:06:12,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-27 04:06:12,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2018-10-27 04:06:12,607 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 25 [2018-10-27 04:06:12,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:12,607 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2018-10-27 04:06:12,607 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 04:06:12,608 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2018-10-27 04:06:12,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-27 04:06:12,609 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:12,609 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:12,609 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:12,610 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:12,610 INFO L82 PathProgramCache]: Analyzing trace with hash 1046211866, now seen corresponding path program 3 times [2018-10-27 04:06:12,610 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:12,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:12,611 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:12,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:12,612 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:12,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:12,905 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-27 04:06:12,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:12,905 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:12,905 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:12,906 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:12,906 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:12,906 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:12,919 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:06:12,919 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:06:12,935 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:06:12,935 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:12,942 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:13,010 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-27 04:06:13,010 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:13,574 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-27 04:06:13,606 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:13,606 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 12] total 20 [2018-10-27 04:06:13,606 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:13,607 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 04:06:13,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 04:06:13,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2018-10-27 04:06:13,608 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 10 states. [2018-10-27 04:06:13,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:13,889 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2018-10-27 04:06:13,892 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 04:06:13,893 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-27 04:06:13,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:13,894 INFO L225 Difference]: With dead ends: 38 [2018-10-27 04:06:13,894 INFO L226 Difference]: Without dead ends: 33 [2018-10-27 04:06:13,895 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 50 SyntacticMatches, 8 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=98, Invalid=408, Unknown=0, NotChecked=0, Total=506 [2018-10-27 04:06:13,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-27 04:06:13,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2018-10-27 04:06:13,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-27 04:06:13,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2018-10-27 04:06:13,902 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 32 [2018-10-27 04:06:13,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:13,902 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2018-10-27 04:06:13,903 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 04:06:13,903 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2018-10-27 04:06:13,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-27 04:06:13,904 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:13,905 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:13,905 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:13,905 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:13,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1312440804, now seen corresponding path program 4 times [2018-10-27 04:06:13,906 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:13,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:13,907 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:13,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:13,907 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:13,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:14,140 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-27 04:06:14,140 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:14,141 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:14,141 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:14,141 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:14,141 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:14,141 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:14,150 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:14,151 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:14,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:14,170 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:14,246 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-27 04:06:14,246 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:15,287 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-27 04:06:15,308 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:15,309 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 15] total 25 [2018-10-27 04:06:15,309 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:15,309 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 04:06:15,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 04:06:15,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=508, Unknown=0, NotChecked=0, Total=600 [2018-10-27 04:06:15,311 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand 12 states. [2018-10-27 04:06:15,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:15,608 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2018-10-27 04:06:15,609 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-27 04:06:15,609 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2018-10-27 04:06:15,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:15,611 INFO L225 Difference]: With dead ends: 42 [2018-10-27 04:06:15,611 INFO L226 Difference]: Without dead ends: 37 [2018-10-27 04:06:15,612 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 60 SyntacticMatches, 10 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=144, Invalid=668, Unknown=0, NotChecked=0, Total=812 [2018-10-27 04:06:15,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-27 04:06:15,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2018-10-27 04:06:15,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-27 04:06:15,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2018-10-27 04:06:15,619 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 39 [2018-10-27 04:06:15,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:15,620 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2018-10-27 04:06:15,620 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 04:06:15,620 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2018-10-27 04:06:15,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-27 04:06:15,622 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:15,622 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:15,623 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:15,623 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:15,623 INFO L82 PathProgramCache]: Analyzing trace with hash -341760294, now seen corresponding path program 5 times [2018-10-27 04:06:15,623 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:15,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:15,625 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:15,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:15,625 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:15,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:15,944 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-27 04:06:15,945 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:15,945 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:15,945 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:15,945 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:15,945 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:15,946 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:15,954 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:15,954 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:17,773 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 04:06:17,774 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:17,789 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:17,866 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-27 04:06:17,867 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:19,205 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-10-27 04:06:19,228 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:19,228 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 18] total 30 [2018-10-27 04:06:19,228 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:19,229 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 04:06:19,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 04:06:19,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=747, Unknown=0, NotChecked=0, Total=870 [2018-10-27 04:06:19,231 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 14 states. [2018-10-27 04:06:19,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:19,667 INFO L93 Difference]: Finished difference Result 46 states and 52 transitions. [2018-10-27 04:06:19,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 04:06:19,668 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 46 [2018-10-27 04:06:19,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:19,669 INFO L225 Difference]: With dead ends: 46 [2018-10-27 04:06:19,669 INFO L226 Difference]: Without dead ends: 41 [2018-10-27 04:06:19,671 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 70 SyntacticMatches, 12 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=198, Invalid=992, Unknown=0, NotChecked=0, Total=1190 [2018-10-27 04:06:19,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-27 04:06:19,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2018-10-27 04:06:19,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-27 04:06:19,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2018-10-27 04:06:19,680 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 46 [2018-10-27 04:06:19,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:19,681 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2018-10-27 04:06:19,681 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 04:06:19,681 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2018-10-27 04:06:19,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-27 04:06:19,683 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:19,683 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:19,683 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:19,684 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:19,684 INFO L82 PathProgramCache]: Analyzing trace with hash -2000679844, now seen corresponding path program 6 times [2018-10-27 04:06:19,684 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:19,685 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:19,685 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:19,685 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:19,686 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:19,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:20,140 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-27 04:06:20,140 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:20,140 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:20,140 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:20,140 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:20,141 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:20,141 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:20,149 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:06:20,149 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:06:20,169 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:06:20,169 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:20,174 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:20,361 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-27 04:06:20,362 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:21,361 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 04:06:21,466 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 04:06:24,176 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 04:06:24,201 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:24,201 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 21] total 35 [2018-10-27 04:06:24,201 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:24,202 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 04:06:24,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 04:06:24,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1032, Unknown=0, NotChecked=0, Total=1190 [2018-10-27 04:06:24,203 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand 16 states. [2018-10-27 04:06:24,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:24,717 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2018-10-27 04:06:24,719 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 04:06:24,719 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 53 [2018-10-27 04:06:24,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:24,721 INFO L225 Difference]: With dead ends: 50 [2018-10-27 04:06:24,721 INFO L226 Difference]: Without dead ends: 45 [2018-10-27 04:06:24,723 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 80 SyntacticMatches, 14 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=260, Invalid=1380, Unknown=0, NotChecked=0, Total=1640 [2018-10-27 04:06:24,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-27 04:06:24,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2018-10-27 04:06:24,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-27 04:06:24,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2018-10-27 04:06:24,730 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 53 [2018-10-27 04:06:24,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:24,730 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2018-10-27 04:06:24,730 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 04:06:24,730 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2018-10-27 04:06:24,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-10-27 04:06:24,732 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:24,732 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:24,732 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:24,732 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:24,732 INFO L82 PathProgramCache]: Analyzing trace with hash -1151446886, now seen corresponding path program 7 times [2018-10-27 04:06:24,732 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:24,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:24,733 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:24,734 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:24,734 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:24,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:25,128 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-10-27 04:06:25,128 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:25,128 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:25,128 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:25,128 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:25,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:25,129 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:25,136 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:25,137 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:25,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:25,161 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:25,295 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-10-27 04:06:25,295 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:26,985 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-10-27 04:06:27,009 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:27,009 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 24] total 40 [2018-10-27 04:06:27,009 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:27,010 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 04:06:27,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 04:06:27,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1363, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 04:06:27,011 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand 18 states. [2018-10-27 04:06:27,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:27,511 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2018-10-27 04:06:27,512 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 04:06:27,512 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 60 [2018-10-27 04:06:27,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:27,514 INFO L225 Difference]: With dead ends: 54 [2018-10-27 04:06:27,514 INFO L226 Difference]: Without dead ends: 49 [2018-10-27 04:06:27,515 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 90 SyntacticMatches, 16 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=330, Invalid=1832, Unknown=0, NotChecked=0, Total=2162 [2018-10-27 04:06:27,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-27 04:06:27,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2018-10-27 04:06:27,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-27 04:06:27,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 54 transitions. [2018-10-27 04:06:27,522 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 54 transitions. Word has length 60 [2018-10-27 04:06:27,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:27,523 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 54 transitions. [2018-10-27 04:06:27,523 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 04:06:27,523 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 54 transitions. [2018-10-27 04:06:27,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-27 04:06:27,525 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:27,525 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:27,525 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:27,525 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:27,525 INFO L82 PathProgramCache]: Analyzing trace with hash -210474340, now seen corresponding path program 8 times [2018-10-27 04:06:27,526 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:27,526 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:27,526 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:27,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:27,527 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:27,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:27,926 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-27 04:06:27,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:27,926 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:27,926 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:27,927 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:27,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:27,927 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:27,937 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:27,938 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:07:01,237 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 04:07:01,238 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:07:01,273 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:01,380 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-27 04:07:01,381 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:51,541 WARN L179 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 13 [2018-10-27 04:08:02,256 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 160 refuted. 24 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-27 04:08:02,292 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:08:02,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 30] total 48 [2018-10-27 04:08:02,293 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:08:02,294 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 04:08:02,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 04:08:02,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=1977, Unknown=24, NotChecked=0, Total=2256 [2018-10-27 04:08:02,296 INFO L87 Difference]: Start difference. First operand 47 states and 54 transitions. Second operand 20 states. [2018-10-27 04:08:03,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:08:03,051 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2018-10-27 04:08:03,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 04:08:03,052 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2018-10-27 04:08:03,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:08:03,054 INFO L225 Difference]: With dead ends: 58 [2018-10-27 04:08:03,054 INFO L226 Difference]: Without dead ends: 53 [2018-10-27 04:08:03,056 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 96 SyntacticMatches, 19 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 61.2s TimeCoverageRelationStatistics Valid=423, Invalid=2633, Unknown=24, NotChecked=0, Total=3080 [2018-10-27 04:08:03,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-10-27 04:08:03,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2018-10-27 04:08:03,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-27 04:08:03,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 59 transitions. [2018-10-27 04:08:03,064 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 59 transitions. Word has length 67 [2018-10-27 04:08:03,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:08:03,064 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 59 transitions. [2018-10-27 04:08:03,064 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 04:08:03,064 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 59 transitions. [2018-10-27 04:08:03,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-27 04:08:03,066 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:08:03,066 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:08:03,066 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:08:03,066 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:08:03,066 INFO L82 PathProgramCache]: Analyzing trace with hash 1156541018, now seen corresponding path program 9 times [2018-10-27 04:08:03,067 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:08:03,067 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:03,068 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:08:03,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:03,068 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:08:03,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:03,774 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-27 04:08:03,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:03,774 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:08:03,774 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:08:03,775 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:08:03,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:03,775 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:08:03,784 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:08:03,784 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:08:03,808 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:08:03,808 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:08:03,811 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:08:03,874 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-27 04:08:03,874 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:08:06,126 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-10-27 04:08:06,146 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:08:06,146 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 30] total 50 [2018-10-27 04:08:06,146 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:08:06,147 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 04:08:06,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 04:08:06,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=2163, Unknown=0, NotChecked=0, Total=2450 [2018-10-27 04:08:06,149 INFO L87 Difference]: Start difference. First operand 51 states and 59 transitions. Second operand 22 states. [2018-10-27 04:08:06,633 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-27 04:08:07,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:08:07,560 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2018-10-27 04:08:07,561 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 04:08:07,561 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 74 [2018-10-27 04:08:07,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:08:07,563 INFO L225 Difference]: With dead ends: 62 [2018-10-27 04:08:07,563 INFO L226 Difference]: Without dead ends: 57 [2018-10-27 04:08:07,565 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 110 SyntacticMatches, 20 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=494, Invalid=2928, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 04:08:07,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-27 04:08:07,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2018-10-27 04:08:07,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-10-27 04:08:07,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2018-10-27 04:08:07,572 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 74 [2018-10-27 04:08:07,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:08:07,572 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2018-10-27 04:08:07,572 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 04:08:07,572 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2018-10-27 04:08:07,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-10-27 04:08:07,574 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:08:07,574 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:08:07,574 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:08:07,574 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:08:07,575 INFO L82 PathProgramCache]: Analyzing trace with hash -1694050084, now seen corresponding path program 10 times [2018-10-27 04:08:07,575 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:08:07,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:07,576 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:08:07,576 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:07,576 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:08:07,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:07,997 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-10-27 04:08:07,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:07,998 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:08:07,998 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:08:07,998 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:08:07,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:07,998 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:08:08,008 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:08:08,008 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:08:08,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:08,035 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:08:08,158 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-10-27 04:08:08,159 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:08:09,451 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 04:08:09,568 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 04:08:13,294 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 290 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-27 04:08:13,315 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:08:13,316 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 33] total 55 [2018-10-27 04:08:13,316 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:08:13,316 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 04:08:13,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 04:08:13,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=2632, Unknown=1, NotChecked=0, Total=2970 [2018-10-27 04:08:13,319 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand 24 states. [2018-10-27 04:08:14,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:08:14,379 INFO L93 Difference]: Finished difference Result 66 states and 77 transitions. [2018-10-27 04:08:14,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-27 04:08:14,380 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 81 [2018-10-27 04:08:14,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:08:14,381 INFO L225 Difference]: With dead ends: 66 [2018-10-27 04:08:14,381 INFO L226 Difference]: Without dead ends: 61 [2018-10-27 04:08:14,383 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 120 SyntacticMatches, 22 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 359 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=587, Invalid=3572, Unknown=1, NotChecked=0, Total=4160 [2018-10-27 04:08:14,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-27 04:08:14,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2018-10-27 04:08:14,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-27 04:08:14,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 69 transitions. [2018-10-27 04:08:14,390 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 69 transitions. Word has length 81 [2018-10-27 04:08:14,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:08:14,390 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 69 transitions. [2018-10-27 04:08:14,390 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 04:08:14,390 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 69 transitions. [2018-10-27 04:08:14,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-10-27 04:08:14,392 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:08:14,392 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:08:14,392 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:08:14,392 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:08:14,393 INFO L82 PathProgramCache]: Analyzing trace with hash 246445082, now seen corresponding path program 11 times [2018-10-27 04:08:14,393 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:08:14,394 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:14,394 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:08:14,394 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:14,394 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:08:14,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:15,076 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-27 04:08:15,076 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:15,077 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:08:15,077 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:08:15,077 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:08:15,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:15,077 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:08:15,086 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:08:15,086 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:09:04,156 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 04:09:04,156 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:09:04,329 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:09:04,560 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-27 04:09:04,560 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:09:08,004 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 352 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-10-27 04:09:08,025 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:09:08,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 36] total 60 [2018-10-27 04:09:08,025 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:09:08,026 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-27 04:09:08,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-27 04:09:08,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=393, Invalid=3147, Unknown=0, NotChecked=0, Total=3540 [2018-10-27 04:09:08,028 INFO L87 Difference]: Start difference. First operand 59 states and 69 transitions. Second operand 26 states. [2018-10-27 04:09:09,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:09:09,260 INFO L93 Difference]: Finished difference Result 70 states and 82 transitions. [2018-10-27 04:09:09,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 04:09:09,261 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 88 [2018-10-27 04:09:09,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:09:09,262 INFO L225 Difference]: With dead ends: 70 [2018-10-27 04:09:09,262 INFO L226 Difference]: Without dead ends: 65 [2018-10-27 04:09:09,264 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 130 SyntacticMatches, 24 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 440 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=690, Invalid=4280, Unknown=0, NotChecked=0, Total=4970 [2018-10-27 04:09:09,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-10-27 04:09:09,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2018-10-27 04:09:09,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-27 04:09:09,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2018-10-27 04:09:09,273 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 88 [2018-10-27 04:09:09,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:09:09,273 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2018-10-27 04:09:09,273 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-27 04:09:09,273 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2018-10-27 04:09:09,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-27 04:09:09,279 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:09:09,279 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:09:09,279 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:09:09,279 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:09:09,279 INFO L82 PathProgramCache]: Analyzing trace with hash 1503352604, now seen corresponding path program 12 times [2018-10-27 04:09:09,279 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:09:09,280 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:09:09,280 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:09:09,280 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:09:09,280 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:09:09,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:09:09,957 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-27 04:09:09,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:09:09,957 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:09:09,958 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:09:09,958 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:09:09,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:09:09,958 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:09:09,965 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:09:09,965 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:09:09,997 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:09:09,997 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:09:10,001 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:09:10,195 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-27 04:09:10,195 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:09:13,963 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-27 04:09:13,983 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:09:13,984 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 39] total 65 [2018-10-27 04:09:13,984 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:09:13,984 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-27 04:09:13,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-27 04:09:13,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=452, Invalid=3708, Unknown=0, NotChecked=0, Total=4160 [2018-10-27 04:09:13,987 INFO L87 Difference]: Start difference. First operand 63 states and 74 transitions. Second operand 28 states. [2018-10-27 04:09:15,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:09:15,186 INFO L93 Difference]: Finished difference Result 74 states and 87 transitions. [2018-10-27 04:09:15,186 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 04:09:15,187 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 95 [2018-10-27 04:09:15,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:09:15,188 INFO L225 Difference]: With dead ends: 74 [2018-10-27 04:09:15,189 INFO L226 Difference]: Without dead ends: 69 [2018-10-27 04:09:15,191 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 140 SyntacticMatches, 26 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=800, Invalid=5052, Unknown=0, NotChecked=0, Total=5852 [2018-10-27 04:09:15,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-27 04:09:15,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2018-10-27 04:09:15,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-10-27 04:09:15,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 79 transitions. [2018-10-27 04:09:15,198 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 79 transitions. Word has length 95 [2018-10-27 04:09:15,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:09:15,198 INFO L481 AbstractCegarLoop]: Abstraction has 67 states and 79 transitions. [2018-10-27 04:09:15,198 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-27 04:09:15,199 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 79 transitions. [2018-10-27 04:09:15,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-10-27 04:09:15,200 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:09:15,200 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:09:15,200 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:09:15,201 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:09:15,201 INFO L82 PathProgramCache]: Analyzing trace with hash 1308454362, now seen corresponding path program 13 times [2018-10-27 04:09:15,201 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:09:15,201 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:09:15,202 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:09:15,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:09:15,202 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:09:15,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:09:16,082 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-10-27 04:09:16,082 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:09:16,083 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:09:16,083 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:09:16,083 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:09:16,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:09:16,083 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:09:16,093 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:09:16,093 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:09:16,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:09:16,127 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:09:16,229 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-10-27 04:09:16,229 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:09:23,162 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 494 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-10-27 04:09:23,183 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:09:23,183 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 42] total 70 [2018-10-27 04:09:23,183 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:09:23,184 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 04:09:23,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 04:09:23,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=514, Invalid=4315, Unknown=1, NotChecked=0, Total=4830 [2018-10-27 04:09:23,186 INFO L87 Difference]: Start difference. First operand 67 states and 79 transitions. Second operand 30 states. [2018-10-27 04:09:24,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:09:24,545 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-10-27 04:09:24,546 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-27 04:09:24,546 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 102 [2018-10-27 04:09:24,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:09:24,547 INFO L225 Difference]: With dead ends: 78 [2018-10-27 04:09:24,547 INFO L226 Difference]: Without dead ends: 73 [2018-10-27 04:09:24,550 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 150 SyntacticMatches, 28 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 611 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=917, Invalid=5888, Unknown=1, NotChecked=0, Total=6806 [2018-10-27 04:09:24,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-27 04:09:24,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2018-10-27 04:09:24,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-10-27 04:09:24,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 84 transitions. [2018-10-27 04:09:24,557 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 84 transitions. Word has length 102 [2018-10-27 04:09:24,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:09:24,557 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 84 transitions. [2018-10-27 04:09:24,557 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 04:09:24,558 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 84 transitions. [2018-10-27 04:09:24,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-27 04:09:24,559 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:09:24,559 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:09:24,559 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:09:24,559 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:09:24,560 INFO L82 PathProgramCache]: Analyzing trace with hash 2052449628, now seen corresponding path program 14 times [2018-10-27 04:09:24,560 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:09:24,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:09:24,560 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:09:24,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:09:24,561 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:09:24,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:09:25,727 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-27 04:09:25,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:09:25,728 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:09:25,728 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:09:25,728 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:09:25,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:09:25,728 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:09:25,740 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:09:25,740 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:10:12,034 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-27 04:10:12,034 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:10:12,082 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:10:12,220 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-27 04:10:12,220 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:10:16,819 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 574 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-27 04:10:16,842 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:10:16,842 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 45] total 75 [2018-10-27 04:10:16,843 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:10:16,843 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-27 04:10:16,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-27 04:10:16,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=582, Invalid=4968, Unknown=0, NotChecked=0, Total=5550 [2018-10-27 04:10:16,846 INFO L87 Difference]: Start difference. First operand 71 states and 84 transitions. Second operand 32 states. [2018-10-27 04:10:20,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:10:20,594 INFO L93 Difference]: Finished difference Result 82 states and 97 transitions. [2018-10-27 04:10:20,594 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 04:10:20,594 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 109 [2018-10-27 04:10:20,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:10:20,596 INFO L225 Difference]: With dead ends: 82 [2018-10-27 04:10:20,596 INFO L226 Difference]: Without dead ends: 77 [2018-10-27 04:10:20,598 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 160 SyntacticMatches, 30 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=1044, Invalid=6788, Unknown=0, NotChecked=0, Total=7832 [2018-10-27 04:10:20,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-10-27 04:10:20,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2018-10-27 04:10:20,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-27 04:10:20,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 89 transitions. [2018-10-27 04:10:20,604 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 89 transitions. Word has length 109 [2018-10-27 04:10:20,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:10:20,605 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 89 transitions. [2018-10-27 04:10:20,605 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-27 04:10:20,605 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 89 transitions. [2018-10-27 04:10:20,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-27 04:10:20,606 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:10:20,606 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:10:20,607 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:10:20,607 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:10:20,607 INFO L82 PathProgramCache]: Analyzing trace with hash -1489872998, now seen corresponding path program 15 times [2018-10-27 04:10:20,607 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:10:20,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:10:20,608 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:10:20,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:10:20,608 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:10:20,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:10:21,553 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-27 04:10:21,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:10:21,553 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:10:21,553 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:10:21,553 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:10:21,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:10:21,554 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:10:21,561 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:10:21,561 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:10:21,598 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:10:21,598 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:10:21,603 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:10:21,722 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-27 04:10:21,723 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:10:26,620 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 660 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-10-27 04:10:26,641 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:10:26,641 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 48] total 80 [2018-10-27 04:10:26,641 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:10:26,642 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-27 04:10:26,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-27 04:10:26,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=653, Invalid=5667, Unknown=0, NotChecked=0, Total=6320 [2018-10-27 04:10:26,643 INFO L87 Difference]: Start difference. First operand 75 states and 89 transitions. Second operand 34 states. [2018-10-27 04:10:28,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:10:28,487 INFO L93 Difference]: Finished difference Result 86 states and 102 transitions. [2018-10-27 04:10:28,488 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-27 04:10:28,488 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 116 [2018-10-27 04:10:28,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:10:28,489 INFO L225 Difference]: With dead ends: 86 [2018-10-27 04:10:28,489 INFO L226 Difference]: Without dead ends: 81 [2018-10-27 04:10:28,491 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 170 SyntacticMatches, 32 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 810 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=1178, Invalid=7752, Unknown=0, NotChecked=0, Total=8930 [2018-10-27 04:10:28,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-27 04:10:28,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2018-10-27 04:10:28,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-27 04:10:28,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 94 transitions. [2018-10-27 04:10:28,499 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 94 transitions. Word has length 116 [2018-10-27 04:10:28,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:10:28,499 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 94 transitions. [2018-10-27 04:10:28,499 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-27 04:10:28,499 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 94 transitions. [2018-10-27 04:10:28,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-10-27 04:10:28,501 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:10:28,501 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:10:28,501 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:10:28,501 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:10:28,502 INFO L82 PathProgramCache]: Analyzing trace with hash -111508580, now seen corresponding path program 16 times [2018-10-27 04:10:28,502 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:10:28,502 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:10:28,502 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:10:28,503 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:10:28,503 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:10:28,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:10:29,513 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-10-27 04:10:29,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:10:29,513 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:10:29,513 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:10:29,513 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:10:29,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:10:29,513 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:10:29,522 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:10:29,522 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:10:29,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:10:29,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:10:29,663 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-10-27 04:10:29,663 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:10:37,369 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 752 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-27 04:10:37,391 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:10:37,391 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 51] total 85 [2018-10-27 04:10:37,391 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:10:37,392 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-27 04:10:37,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-27 04:10:37,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=727, Invalid=6412, Unknown=1, NotChecked=0, Total=7140 [2018-10-27 04:10:37,393 INFO L87 Difference]: Start difference. First operand 79 states and 94 transitions. Second operand 36 states. Received shutdown request... [2018-10-27 04:10:38,414 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 04:10:38,415 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-27 04:10:38,421 WARN L205 ceAbstractionStarter]: Timeout [2018-10-27 04:10:38,422 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 04:10:38 BoogieIcfgContainer [2018-10-27 04:10:38,422 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-27 04:10:38,423 INFO L168 Benchmark]: Toolchain (without parser) took 272563.33 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 910.2 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -720.4 MB). Peak memory consumption was 189.8 MB. Max. memory is 7.1 GB. [2018-10-27 04:10:38,424 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 04:10:38,424 INFO L168 Benchmark]: CACSL2BoogieTranslator took 256.72 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-27 04:10:38,425 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.01 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 04:10:38,425 INFO L168 Benchmark]: Boogie Preprocessor took 22.07 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 04:10:38,426 INFO L168 Benchmark]: RCFGBuilder took 308.18 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 722.5 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -774.3 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. [2018-10-27 04:10:38,426 INFO L168 Benchmark]: TraceAbstraction took 271948.34 ms. Allocated memory was 2.2 GB in the beginning and 2.4 GB in the end (delta: 187.7 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 43.3 MB). Peak memory consumption was 231.0 MB. Max. memory is 7.1 GB. [2018-10-27 04:10:38,430 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 256.72 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 23.01 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 22.07 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 308.18 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 722.5 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -774.3 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 271948.34 ms. Allocated memory was 2.2 GB in the beginning and 2.4 GB in the end (delta: 187.7 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 43.3 MB). Peak memory consumption was 231.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 4]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 4). Cancelled while BasicCegarLoop was constructing difference of abstraction (79states) and FLOYD_HOARE automaton (currently 18 states, 36 states before enhancement),while ReachableStatesComputation was computing reachable states (36 states constructedinput type IntersectNwa). - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 23 locations, 1 error locations. TIMEOUT Result, 271.8s OverallTime, 18 OverallIterations, 17 TraceHistogramMax, 16.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 526 SDtfs, 16 SDslu, 9359 SDs, 0 SdLazy, 10244 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 9.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2845 GetRequests, 1676 SyntacticMatches, 307 SemanticMatches, 862 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5327 ImplicationChecksByTransitivity, 120.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=79occurred in iteration=17, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.6s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 17 MinimizatonAttempts, 32 StatesRemovedByMinimization, 16 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 131.0s SatisfiabilityAnalysisTime, 122.7s InterpolantComputationTime, 2277 NumberOfCodeBlocks, 2277 NumberOfCodeBlocksAsserted, 79 NumberOfCheckSat, 3355 ConstructedInterpolants, 0 QuantifiedInterpolants, 1999727 SizeOfPredicates, 286 NumberOfNonLiveVariables, 2408 ConjunctsInSsa, 1420 ConjunctsInUnsatCore, 50 InterpolantComputations, 2 PerfectInterpolantSequences, 4760/15096 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown