java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-invgen/string_concat-noarr_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 09:13:02,149 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 09:13:02,151 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 09:13:02,168 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 09:13:02,168 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 09:13:02,169 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 09:13:02,171 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 09:13:02,174 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 09:13:02,176 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 09:13:02,177 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 09:13:02,178 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 09:13:02,178 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 09:13:02,179 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 09:13:02,180 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 09:13:02,181 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 09:13:02,182 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 09:13:02,186 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 09:13:02,188 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 09:13:02,193 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 09:13:02,194 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 09:13:02,197 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 09:13:02,198 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 09:13:02,201 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-27 09:13:02,212 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-27 09:13:02,241 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 09:13:02,242 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 09:13:02,243 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 09:13:02,243 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 09:13:02,244 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 09:13:02,244 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 09:13:02,244 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-27 09:13:02,244 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 09:13:02,244 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 09:13:02,245 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 09:13:02,248 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 09:13:02,248 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 09:13:02,248 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 09:13:02,248 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 09:13:02,249 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 09:13:02,249 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 09:13:02,249 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 09:13:02,250 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 09:13:02,251 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 09:13:02,252 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 09:13:02,252 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 09:13:02,252 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 09:13:02,252 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 09:13:02,252 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 09:13:02,253 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 09:13:02,253 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 09:13:02,253 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 09:13:02,253 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 09:13:02,254 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 09:13:02,254 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 09:13:02,254 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 09:13:02,254 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 09:13:02,254 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 09:13:02,254 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 09:13:02,255 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 09:13:02,255 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 09:13:02,317 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 09:13:02,335 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 09:13:02,339 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 09:13:02,341 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 09:13:02,341 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 09:13:02,342 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-invgen/string_concat-noarr_true-unreach-call_true-termination.i [2018-10-27 09:13:02,400 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/969ac1615/5e1c3a0a8b0a4f59851d36d47455e53d/FLAG830bc0f32 [2018-10-27 09:13:02,813 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 09:13:02,813 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/string_concat-noarr_true-unreach-call_true-termination.i [2018-10-27 09:13:02,819 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/969ac1615/5e1c3a0a8b0a4f59851d36d47455e53d/FLAG830bc0f32 [2018-10-27 09:13:02,834 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/969ac1615/5e1c3a0a8b0a4f59851d36d47455e53d [2018-10-27 09:13:02,846 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 09:13:02,848 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 09:13:02,849 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 09:13:02,849 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 09:13:02,852 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 09:13:02,853 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:13:02" (1/1) ... [2018-10-27 09:13:02,856 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@fa499b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:13:02, skipping insertion in model container [2018-10-27 09:13:02,856 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:13:02" (1/1) ... [2018-10-27 09:13:02,867 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 09:13:02,895 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 09:13:03,079 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:13:03,083 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 09:13:03,101 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:13:03,116 INFO L193 MainTranslator]: Completed translation [2018-10-27 09:13:03,117 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:13:03 WrapperNode [2018-10-27 09:13:03,117 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 09:13:03,118 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 09:13:03,118 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 09:13:03,118 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 09:13:03,128 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:13:03" (1/1) ... [2018-10-27 09:13:03,134 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:13:03" (1/1) ... [2018-10-27 09:13:03,140 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 09:13:03,140 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 09:13:03,140 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 09:13:03,141 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 09:13:03,151 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:13:03" (1/1) ... [2018-10-27 09:13:03,151 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:13:03" (1/1) ... [2018-10-27 09:13:03,152 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:13:03" (1/1) ... [2018-10-27 09:13:03,152 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:13:03" (1/1) ... [2018-10-27 09:13:03,155 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:13:03" (1/1) ... [2018-10-27 09:13:03,161 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:13:03" (1/1) ... [2018-10-27 09:13:03,162 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:13:03" (1/1) ... [2018-10-27 09:13:03,163 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 09:13:03,164 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 09:13:03,164 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 09:13:03,164 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 09:13:03,165 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:13:03" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 09:13:03,300 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 09:13:03,300 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 09:13:03,301 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 09:13:03,301 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 09:13:03,301 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 09:13:03,301 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 09:13:03,301 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 09:13:03,301 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 09:13:03,612 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 09:13:03,613 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:13:03 BoogieIcfgContainer [2018-10-27 09:13:03,613 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 09:13:03,614 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 09:13:03,614 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 09:13:03,617 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 09:13:03,618 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 09:13:02" (1/3) ... [2018-10-27 09:13:03,618 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51ce781a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:13:03, skipping insertion in model container [2018-10-27 09:13:03,619 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:13:03" (2/3) ... [2018-10-27 09:13:03,619 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51ce781a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:13:03, skipping insertion in model container [2018-10-27 09:13:03,619 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:13:03" (3/3) ... [2018-10-27 09:13:03,621 INFO L112 eAbstractionObserver]: Analyzing ICFG string_concat-noarr_true-unreach-call_true-termination.i [2018-10-27 09:13:03,630 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 09:13:03,638 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 09:13:03,654 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 09:13:03,688 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 09:13:03,688 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 09:13:03,688 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 09:13:03,688 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 09:13:03,689 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 09:13:03,689 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 09:13:03,689 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 09:13:03,689 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 09:13:03,708 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2018-10-27 09:13:03,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-27 09:13:03,714 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:03,715 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:03,718 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:03,723 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:03,724 INFO L82 PathProgramCache]: Analyzing trace with hash -745796184, now seen corresponding path program 1 times [2018-10-27 09:13:03,726 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:03,772 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:03,772 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:03,772 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:03,772 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:03,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:03,830 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:03,832 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:13:03,833 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 09:13:03,833 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:13:03,837 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 09:13:03,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 09:13:03,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 09:13:03,856 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2018-10-27 09:13:03,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:03,883 INFO L93 Difference]: Finished difference Result 45 states and 54 transitions. [2018-10-27 09:13:03,884 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 09:13:03,885 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2018-10-27 09:13:03,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:03,894 INFO L225 Difference]: With dead ends: 45 [2018-10-27 09:13:03,894 INFO L226 Difference]: Without dead ends: 19 [2018-10-27 09:13:03,897 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 09:13:03,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-27 09:13:03,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-27 09:13:03,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-27 09:13:03,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-10-27 09:13:03,931 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-10-27 09:13:03,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:03,932 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-10-27 09:13:03,932 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 09:13:03,932 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-10-27 09:13:03,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-27 09:13:03,933 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:03,933 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:03,934 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:03,934 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:03,934 INFO L82 PathProgramCache]: Analyzing trace with hash 800081396, now seen corresponding path program 1 times [2018-10-27 09:13:03,935 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:03,936 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:03,936 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:03,936 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:03,936 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:03,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:04,150 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:04,151 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:13:04,151 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-27 09:13:04,151 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:13:04,153 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 09:13:04,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 09:13:04,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-27 09:13:04,154 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 5 states. [2018-10-27 09:13:04,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:04,299 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2018-10-27 09:13:04,300 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 09:13:04,300 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2018-10-27 09:13:04,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:04,301 INFO L225 Difference]: With dead ends: 32 [2018-10-27 09:13:04,301 INFO L226 Difference]: Without dead ends: 26 [2018-10-27 09:13:04,303 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-27 09:13:04,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-27 09:13:04,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-27 09:13:04,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-27 09:13:04,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2018-10-27 09:13:04,308 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 18 [2018-10-27 09:13:04,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:04,309 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2018-10-27 09:13:04,309 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 09:13:04,309 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2018-10-27 09:13:04,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-27 09:13:04,310 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:04,311 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:04,311 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:04,311 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:04,312 INFO L82 PathProgramCache]: Analyzing trace with hash 1097925811, now seen corresponding path program 1 times [2018-10-27 09:13:04,312 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:04,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:04,313 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:04,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:04,314 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:04,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:04,423 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-27 09:13:04,424 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:13:04,424 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-27 09:13:04,424 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:13:04,425 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 09:13:04,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 09:13:04,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-27 09:13:04,426 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 5 states. [2018-10-27 09:13:04,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:04,584 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2018-10-27 09:13:04,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 09:13:04,586 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 21 [2018-10-27 09:13:04,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:04,588 INFO L225 Difference]: With dead ends: 35 [2018-10-27 09:13:04,588 INFO L226 Difference]: Without dead ends: 29 [2018-10-27 09:13:04,591 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-27 09:13:04,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-27 09:13:04,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 22. [2018-10-27 09:13:04,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-27 09:13:04,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2018-10-27 09:13:04,598 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 21 [2018-10-27 09:13:04,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:04,598 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2018-10-27 09:13:04,599 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 09:13:04,599 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2018-10-27 09:13:04,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-27 09:13:04,600 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:04,601 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:04,601 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:04,601 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:04,602 INFO L82 PathProgramCache]: Analyzing trace with hash -278190259, now seen corresponding path program 1 times [2018-10-27 09:13:04,602 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:04,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:04,603 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:04,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:04,603 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:04,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:04,775 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:04,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:04,776 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:04,777 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-10-27 09:13:04,779 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [10], [12], [15], [26], [30], [32], [35], [37], [45], [49], [52], [54], [60], [61], [62], [64] [2018-10-27 09:13:04,814 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-27 09:13:04,814 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 09:13:04,973 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 09:13:04,975 INFO L272 AbstractInterpreter]: Visited 19 different actions 37 times. Merged at 5 different actions 10 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 6 variables. [2018-10-27 09:13:04,989 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:04,990 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 09:13:04,990 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:04,990 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:04,999 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:05,000 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:13:05,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:05,033 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:05,118 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:05,119 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:05,261 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:05,292 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:05,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2018-10-27 09:13:05,293 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:05,293 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 09:13:05,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 09:13:05,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2018-10-27 09:13:05,294 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 8 states. [2018-10-27 09:13:05,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:05,492 INFO L93 Difference]: Finished difference Result 63 states and 70 transitions. [2018-10-27 09:13:05,493 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 09:13:05,493 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-10-27 09:13:05,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:05,495 INFO L225 Difference]: With dead ends: 63 [2018-10-27 09:13:05,495 INFO L226 Difference]: Without dead ends: 53 [2018-10-27 09:13:05,496 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-10-27 09:13:05,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-10-27 09:13:05,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 39. [2018-10-27 09:13:05,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-27 09:13:05,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2018-10-27 09:13:05,504 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 21 [2018-10-27 09:13:05,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:05,504 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2018-10-27 09:13:05,504 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 09:13:05,504 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2018-10-27 09:13:05,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-27 09:13:05,506 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:05,506 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:05,506 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:05,506 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:05,507 INFO L82 PathProgramCache]: Analyzing trace with hash -2006845708, now seen corresponding path program 1 times [2018-10-27 09:13:05,507 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:05,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:05,508 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:05,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:05,508 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:05,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:05,690 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:05,691 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:05,691 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:05,691 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 31 with the following transitions: [2018-10-27 09:13:05,692 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [10], [12], [15], [17], [26], [30], [32], [35], [37], [45], [49], [52], [54], [60], [61], [62], [64] [2018-10-27 09:13:05,693 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-27 09:13:05,694 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 09:13:05,789 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 09:13:05,789 INFO L272 AbstractInterpreter]: Visited 20 different actions 57 times. Merged at 10 different actions 23 times. Never widened. Found 4 fixpoints after 3 different actions. Largest state had 7 variables. [2018-10-27 09:13:05,807 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:05,807 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 09:13:05,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:05,807 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:05,817 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:05,817 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:13:05,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:05,848 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:05,905 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:05,905 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:06,372 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:06,393 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:06,393 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-27 09:13:06,393 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:06,394 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 09:13:06,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 09:13:06,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=164, Unknown=0, NotChecked=0, Total=240 [2018-10-27 09:13:06,395 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 9 states. [2018-10-27 09:13:06,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:06,564 INFO L93 Difference]: Finished difference Result 75 states and 81 transitions. [2018-10-27 09:13:06,564 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 09:13:06,564 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 30 [2018-10-27 09:13:06,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:06,569 INFO L225 Difference]: With dead ends: 75 [2018-10-27 09:13:06,569 INFO L226 Difference]: Without dead ends: 69 [2018-10-27 09:13:06,570 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=82, Invalid=190, Unknown=0, NotChecked=0, Total=272 [2018-10-27 09:13:06,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-27 09:13:06,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 46. [2018-10-27 09:13:06,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-27 09:13:06,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2018-10-27 09:13:06,577 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 30 [2018-10-27 09:13:06,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:06,578 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2018-10-27 09:13:06,578 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 09:13:06,578 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2018-10-27 09:13:06,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-27 09:13:06,579 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:06,580 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:06,580 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:06,580 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:06,580 INFO L82 PathProgramCache]: Analyzing trace with hash 750227251, now seen corresponding path program 2 times [2018-10-27 09:13:06,580 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:06,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:06,582 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:06,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:06,583 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:06,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:06,726 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:06,727 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:06,727 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:06,727 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:06,728 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:06,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:06,728 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 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:06,745 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:13:06,745 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:13:06,782 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 09:13:06,783 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:06,785 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:06,956 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-27 09:13:06,956 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:07,144 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-27 09:13:07,164 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:07,164 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 7] total 18 [2018-10-27 09:13:07,164 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:07,165 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 09:13:07,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 09:13:07,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=205, Unknown=0, NotChecked=0, Total=306 [2018-10-27 09:13:07,166 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 13 states. [2018-10-27 09:13:07,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:07,478 INFO L93 Difference]: Finished difference Result 112 states and 125 transitions. [2018-10-27 09:13:07,480 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 09:13:07,480 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2018-10-27 09:13:07,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:07,482 INFO L225 Difference]: With dead ends: 112 [2018-10-27 09:13:07,483 INFO L226 Difference]: Without dead ends: 100 [2018-10-27 09:13:07,484 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=107, Invalid=235, Unknown=0, NotChecked=0, Total=342 [2018-10-27 09:13:07,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-27 09:13:07,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 70. [2018-10-27 09:13:07,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-10-27 09:13:07,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 77 transitions. [2018-10-27 09:13:07,491 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 77 transitions. Word has length 33 [2018-10-27 09:13:07,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:07,492 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 77 transitions. [2018-10-27 09:13:07,492 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 09:13:07,492 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 77 transitions. [2018-10-27 09:13:07,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-27 09:13:07,494 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:07,494 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:07,494 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:07,494 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:07,494 INFO L82 PathProgramCache]: Analyzing trace with hash -1707835635, now seen corresponding path program 3 times [2018-10-27 09:13:07,495 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:07,495 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:07,496 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:07,496 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:07,496 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:07,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:07,845 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:07,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:07,845 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:07,845 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:07,845 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:07,846 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:07,846 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:07,853 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:13:07,853 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:13:07,875 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:13:07,875 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:07,878 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:07,913 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:07,913 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:08,394 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:08,415 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:08,415 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-27 09:13:08,416 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:08,416 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 09:13:08,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 09:13:08,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=409, Unknown=0, NotChecked=0, Total=650 [2018-10-27 09:13:08,417 INFO L87 Difference]: Start difference. First operand 70 states and 77 transitions. Second operand 14 states. [2018-10-27 09:13:08,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:08,569 INFO L93 Difference]: Finished difference Result 122 states and 133 transitions. [2018-10-27 09:13:08,570 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 09:13:08,570 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 45 [2018-10-27 09:13:08,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:08,573 INFO L225 Difference]: With dead ends: 122 [2018-10-27 09:13:08,573 INFO L226 Difference]: Without dead ends: 116 [2018-10-27 09:13:08,574 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=247, Invalid=455, Unknown=0, NotChecked=0, Total=702 [2018-10-27 09:13:08,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2018-10-27 09:13:08,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 77. [2018-10-27 09:13:08,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-27 09:13:08,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 85 transitions. [2018-10-27 09:13:08,583 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 85 transitions. Word has length 45 [2018-10-27 09:13:08,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:08,583 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 85 transitions. [2018-10-27 09:13:08,583 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 09:13:08,583 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 85 transitions. [2018-10-27 09:13:08,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-10-27 09:13:08,585 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:08,585 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:08,585 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:08,586 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:08,586 INFO L82 PathProgramCache]: Analyzing trace with hash 1071743214, now seen corresponding path program 4 times [2018-10-27 09:13:08,586 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:08,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:08,587 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:08,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:08,587 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:08,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:08,766 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:08,767 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:08,767 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:08,767 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:08,767 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:08,767 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:08,767 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:08,776 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:08,776 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:13:08,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:08,799 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:08,836 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:08,837 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:09,211 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:09,231 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:09,231 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-27 09:13:09,231 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:09,232 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 09:13:09,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 09:13:09,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=470, Unknown=0, NotChecked=0, Total=756 [2018-10-27 09:13:09,233 INFO L87 Difference]: Start difference. First operand 77 states and 85 transitions. Second operand 15 states. [2018-10-27 09:13:09,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:09,474 INFO L93 Difference]: Finished difference Result 129 states and 141 transitions. [2018-10-27 09:13:09,477 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 09:13:09,477 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 48 [2018-10-27 09:13:09,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:09,479 INFO L225 Difference]: With dead ends: 129 [2018-10-27 09:13:09,479 INFO L226 Difference]: Without dead ends: 123 [2018-10-27 09:13:09,480 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=292, Invalid=520, Unknown=0, NotChecked=0, Total=812 [2018-10-27 09:13:09,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-27 09:13:09,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 84. [2018-10-27 09:13:09,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-27 09:13:09,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 93 transitions. [2018-10-27 09:13:09,487 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 93 transitions. Word has length 48 [2018-10-27 09:13:09,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:09,488 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 93 transitions. [2018-10-27 09:13:09,488 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 09:13:09,488 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 93 transitions. [2018-10-27 09:13:09,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-27 09:13:09,489 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:09,490 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 8, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:09,490 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:09,490 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:09,490 INFO L82 PathProgramCache]: Analyzing trace with hash 535766893, now seen corresponding path program 5 times [2018-10-27 09:13:09,490 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:09,491 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:09,491 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:09,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:09,492 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:09,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:09,791 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:09,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:09,792 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:09,792 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:09,792 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:09,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:09,792 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:09,801 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:13:09,801 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:13:09,834 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-27 09:13:09,834 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:09,837 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:09,983 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-27 09:13:09,984 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:10,090 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-27 09:13:10,110 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:10,110 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 8, 8] total 26 [2018-10-27 09:13:10,110 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:10,110 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 09:13:10,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 09:13:10,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=409, Unknown=0, NotChecked=0, Total=650 [2018-10-27 09:13:10,111 INFO L87 Difference]: Start difference. First operand 84 states and 93 transitions. Second operand 20 states. [2018-10-27 09:13:10,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:10,426 INFO L93 Difference]: Finished difference Result 181 states and 202 transitions. [2018-10-27 09:13:10,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 09:13:10,427 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 51 [2018-10-27 09:13:10,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:10,429 INFO L225 Difference]: With dead ends: 181 [2018-10-27 09:13:10,430 INFO L226 Difference]: Without dead ends: 167 [2018-10-27 09:13:10,431 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=247, Invalid=455, Unknown=0, NotChecked=0, Total=702 [2018-10-27 09:13:10,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2018-10-27 09:13:10,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 115. [2018-10-27 09:13:10,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-27 09:13:10,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 128 transitions. [2018-10-27 09:13:10,440 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 128 transitions. Word has length 51 [2018-10-27 09:13:10,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:10,440 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 128 transitions. [2018-10-27 09:13:10,441 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 09:13:10,441 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 128 transitions. [2018-10-27 09:13:10,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-10-27 09:13:10,442 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:10,442 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 12, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:10,443 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:10,443 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:10,443 INFO L82 PathProgramCache]: Analyzing trace with hash 227276404, now seen corresponding path program 6 times [2018-10-27 09:13:10,443 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:10,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:10,444 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:10,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:10,445 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:10,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:10,783 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:10,784 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:10,784 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:10,784 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:10,784 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:10,784 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:10,785 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:10,792 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:13:10,792 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:13:10,843 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:13:10,843 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:10,847 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:11,077 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:11,077 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:11,666 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:11,687 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:11,687 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-27 09:13:11,687 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:11,688 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 09:13:11,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 09:13:11,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=640, Invalid=920, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 09:13:11,689 INFO L87 Difference]: Start difference. First operand 115 states and 128 transitions. Second operand 21 states. [2018-10-27 09:13:11,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:11,856 INFO L93 Difference]: Finished difference Result 186 states and 204 transitions. [2018-10-27 09:13:11,856 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 09:13:11,856 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 66 [2018-10-27 09:13:11,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:11,858 INFO L225 Difference]: With dead ends: 186 [2018-10-27 09:13:11,859 INFO L226 Difference]: Without dead ends: 180 [2018-10-27 09:13:11,860 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 113 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=646, Invalid=994, Unknown=0, NotChecked=0, Total=1640 [2018-10-27 09:13:11,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-10-27 09:13:11,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 122. [2018-10-27 09:13:11,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-10-27 09:13:11,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 136 transitions. [2018-10-27 09:13:11,868 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 136 transitions. Word has length 66 [2018-10-27 09:13:11,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:11,869 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 136 transitions. [2018-10-27 09:13:11,869 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 09:13:11,869 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 136 transitions. [2018-10-27 09:13:11,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-27 09:13:11,870 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:11,871 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:11,871 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:11,871 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:11,871 INFO L82 PathProgramCache]: Analyzing trace with hash 1732418355, now seen corresponding path program 7 times [2018-10-27 09:13:11,871 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:11,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:11,872 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:11,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:11,873 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:11,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:12,167 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 0 proven. 303 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:12,168 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:12,168 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:12,168 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:12,168 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:12,168 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:12,168 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:12,177 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:12,177 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:13:12,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:12,202 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:12,239 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 0 proven. 303 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:12,239 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:12,848 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 0 proven. 303 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:12,869 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:12,870 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-27 09:13:12,870 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:12,870 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 09:13:12,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 09:13:12,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=713, Invalid=1009, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 09:13:12,871 INFO L87 Difference]: Start difference. First operand 122 states and 136 transitions. Second operand 22 states. [2018-10-27 09:13:13,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:13,115 INFO L93 Difference]: Finished difference Result 193 states and 212 transitions. [2018-10-27 09:13:13,116 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 09:13:13,116 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 69 [2018-10-27 09:13:13,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:13,120 INFO L225 Difference]: With dead ends: 193 [2018-10-27 09:13:13,120 INFO L226 Difference]: Without dead ends: 187 [2018-10-27 09:13:13,121 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=719, Invalid=1087, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 09:13:13,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-27 09:13:13,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 129. [2018-10-27 09:13:13,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-27 09:13:13,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 144 transitions. [2018-10-27 09:13:13,128 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 144 transitions. Word has length 69 [2018-10-27 09:13:13,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:13,128 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 144 transitions. [2018-10-27 09:13:13,128 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 09:13:13,129 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 144 transitions. [2018-10-27 09:13:13,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-10-27 09:13:13,130 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:13,130 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 14, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:13,130 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:13,131 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:13,131 INFO L82 PathProgramCache]: Analyzing trace with hash 1957710356, now seen corresponding path program 8 times [2018-10-27 09:13:13,131 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:13,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:13,132 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:13,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:13,132 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:13,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:13,564 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:13,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:13,565 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:13,565 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:13,565 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:13,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:13,565 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:13,577 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:13:13,577 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:13:13,605 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-27 09:13:13,606 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:13,610 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:14,180 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-27 09:13:14,180 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:14,319 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-27 09:13:14,341 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:14,341 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 9, 9] total 35 [2018-10-27 09:13:14,341 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:14,342 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-27 09:13:14,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-27 09:13:14,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=475, Invalid=715, Unknown=0, NotChecked=0, Total=1190 [2018-10-27 09:13:14,343 INFO L87 Difference]: Start difference. First operand 129 states and 144 transitions. Second operand 28 states. [2018-10-27 09:13:14,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:14,681 INFO L93 Difference]: Finished difference Result 263 states and 293 transitions. [2018-10-27 09:13:14,681 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 09:13:14,681 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 72 [2018-10-27 09:13:14,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:14,683 INFO L225 Difference]: With dead ends: 263 [2018-10-27 09:13:14,683 INFO L226 Difference]: Without dead ends: 247 [2018-10-27 09:13:14,685 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 132 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=481, Invalid=779, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 09:13:14,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-10-27 09:13:14,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 167. [2018-10-27 09:13:14,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-27 09:13:14,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 187 transitions. [2018-10-27 09:13:14,692 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 187 transitions. Word has length 72 [2018-10-27 09:13:14,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:14,693 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 187 transitions. [2018-10-27 09:13:14,693 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-27 09:13:14,693 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 187 transitions. [2018-10-27 09:13:14,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-10-27 09:13:14,695 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:14,695 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 19, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:14,695 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:14,695 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:14,695 INFO L82 PathProgramCache]: Analyzing trace with hash -1693515634, now seen corresponding path program 9 times [2018-10-27 09:13:14,695 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:14,696 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:14,696 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:14,696 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:14,697 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:14,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:15,569 INFO L134 CoverageAnalysis]: Checked inductivity of 615 backedges. 0 proven. 615 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:15,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:15,569 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:15,569 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:15,569 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:15,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:15,569 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:15,579 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:13:15,579 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:13:15,617 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:13:15,618 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:15,620 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:15,790 INFO L134 CoverageAnalysis]: Checked inductivity of 615 backedges. 0 proven. 615 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:15,790 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:17,773 INFO L134 CoverageAnalysis]: Checked inductivity of 615 backedges. 0 proven. 615 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:17,805 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:17,805 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-10-27 09:13:17,806 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:17,806 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-27 09:13:17,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-27 09:13:17,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1336, Invalid=1744, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 09:13:17,808 INFO L87 Difference]: Start difference. First operand 167 states and 187 transitions. Second operand 29 states. [2018-10-27 09:13:18,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:18,109 INFO L93 Difference]: Finished difference Result 260 states and 286 transitions. [2018-10-27 09:13:18,109 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 09:13:18,110 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 90 [2018-10-27 09:13:18,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:18,112 INFO L225 Difference]: With dead ends: 260 [2018-10-27 09:13:18,113 INFO L226 Difference]: Without dead ends: 254 [2018-10-27 09:13:18,115 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 153 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1342, Invalid=1850, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 09:13:18,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2018-10-27 09:13:18,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 174. [2018-10-27 09:13:18,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-10-27 09:13:18,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 195 transitions. [2018-10-27 09:13:18,121 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 195 transitions. Word has length 90 [2018-10-27 09:13:18,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:18,122 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 195 transitions. [2018-10-27 09:13:18,122 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-27 09:13:18,122 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 195 transitions. [2018-10-27 09:13:18,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-10-27 09:13:18,124 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:18,124 INFO L375 BasicCegarLoop]: trace histogram [21, 21, 20, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:18,124 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:18,124 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:18,124 INFO L82 PathProgramCache]: Analyzing trace with hash 1143150669, now seen corresponding path program 10 times [2018-10-27 09:13:18,125 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:18,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:18,125 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:18,126 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:18,126 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:18,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:18,606 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 0 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:18,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:18,607 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:18,607 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:18,607 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:18,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:18,607 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:18,616 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:18,616 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:13:18,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:18,651 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:18,738 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 0 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:18,738 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:19,623 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 0 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:19,644 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:19,644 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 58 [2018-10-27 09:13:19,644 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:19,645 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 09:13:19,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 09:13:19,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1441, Invalid=1865, Unknown=0, NotChecked=0, Total=3306 [2018-10-27 09:13:19,647 INFO L87 Difference]: Start difference. First operand 174 states and 195 transitions. Second operand 30 states. [2018-10-27 09:13:19,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:19,912 INFO L93 Difference]: Finished difference Result 267 states and 294 transitions. [2018-10-27 09:13:19,912 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-27 09:13:19,913 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 93 [2018-10-27 09:13:19,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:19,915 INFO L225 Difference]: With dead ends: 267 [2018-10-27 09:13:19,915 INFO L226 Difference]: Without dead ends: 261 [2018-10-27 09:13:19,918 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 158 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1447, Invalid=1975, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 09:13:19,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2018-10-27 09:13:19,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 181. [2018-10-27 09:13:19,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2018-10-27 09:13:19,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 203 transitions. [2018-10-27 09:13:19,923 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 203 transitions. Word has length 93 [2018-10-27 09:13:19,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:19,923 INFO L481 AbstractCegarLoop]: Abstraction has 181 states and 203 transitions. [2018-10-27 09:13:19,923 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 09:13:19,923 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 203 transitions. [2018-10-27 09:13:19,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-27 09:13:19,925 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:19,925 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 21, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:19,925 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:19,925 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:19,926 INFO L82 PathProgramCache]: Analyzing trace with hash 492467246, now seen corresponding path program 11 times [2018-10-27 09:13:19,926 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:19,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:19,927 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:19,927 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:19,927 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:19,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:20,439 INFO L134 CoverageAnalysis]: Checked inductivity of 738 backedges. 0 proven. 738 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:20,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:20,440 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:20,440 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:20,440 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:20,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:20,440 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:20,447 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:13:20,447 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:13:20,474 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 09:13:20,474 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:20,476 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:20,742 INFO L134 CoverageAnalysis]: Checked inductivity of 738 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 693 trivial. 0 not checked. [2018-10-27 09:13:20,742 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:20,984 INFO L134 CoverageAnalysis]: Checked inductivity of 738 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 693 trivial. 0 not checked. [2018-10-27 09:13:21,004 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:21,004 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 10, 10] total 45 [2018-10-27 09:13:21,004 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:21,005 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-27 09:13:21,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-27 09:13:21,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=830, Invalid=1150, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 09:13:21,006 INFO L87 Difference]: Start difference. First operand 181 states and 203 transitions. Second operand 37 states. [2018-10-27 09:13:21,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:21,590 INFO L93 Difference]: Finished difference Result 358 states and 398 transitions. [2018-10-27 09:13:21,590 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-27 09:13:21,591 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 96 [2018-10-27 09:13:21,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:21,592 INFO L225 Difference]: With dead ends: 358 [2018-10-27 09:13:21,592 INFO L226 Difference]: Without dead ends: 340 [2018-10-27 09:13:21,594 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 178 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=836, Invalid=1234, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 09:13:21,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2018-10-27 09:13:21,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 226. [2018-10-27 09:13:21,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2018-10-27 09:13:21,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 254 transitions. [2018-10-27 09:13:21,600 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 254 transitions. Word has length 96 [2018-10-27 09:13:21,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:21,600 INFO L481 AbstractCegarLoop]: Abstraction has 226 states and 254 transitions. [2018-10-27 09:13:21,600 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-27 09:13:21,600 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 254 transitions. [2018-10-27 09:13:21,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-10-27 09:13:21,602 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:21,602 INFO L375 BasicCegarLoop]: trace histogram [28, 28, 27, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:21,602 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:21,602 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:21,602 INFO L82 PathProgramCache]: Analyzing trace with hash 494608371, now seen corresponding path program 12 times [2018-10-27 09:13:21,603 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:21,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:21,603 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:21,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:21,604 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:21,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:22,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1197 backedges. 0 proven. 1197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:22,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:22,247 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:22,247 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:22,247 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:22,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:22,248 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:22,256 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:13:22,256 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:13:22,309 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:13:22,309 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:22,312 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:22,413 INFO L134 CoverageAnalysis]: Checked inductivity of 1197 backedges. 0 proven. 1197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:22,413 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:24,233 INFO L134 CoverageAnalysis]: Checked inductivity of 1197 backedges. 0 proven. 1197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:24,253 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:24,253 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-10-27 09:13:24,253 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:24,254 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-27 09:13:24,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-27 09:13:24,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2018-10-27 09:13:24,256 INFO L87 Difference]: Start difference. First operand 226 states and 254 transitions. Second operand 38 states. [2018-10-27 09:13:24,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:24,683 INFO L93 Difference]: Finished difference Result 344 states and 379 transitions. [2018-10-27 09:13:24,689 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-27 09:13:24,689 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 117 [2018-10-27 09:13:24,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:24,691 INFO L225 Difference]: With dead ends: 344 [2018-10-27 09:13:24,691 INFO L226 Difference]: Without dead ends: 338 [2018-10-27 09:13:24,693 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 198 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 267 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2431, Invalid=3119, Unknown=0, NotChecked=0, Total=5550 [2018-10-27 09:13:24,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2018-10-27 09:13:24,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 233. [2018-10-27 09:13:24,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2018-10-27 09:13:24,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 262 transitions. [2018-10-27 09:13:24,699 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 262 transitions. Word has length 117 [2018-10-27 09:13:24,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:24,699 INFO L481 AbstractCegarLoop]: Abstraction has 233 states and 262 transitions. [2018-10-27 09:13:24,699 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-27 09:13:24,700 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 262 transitions. [2018-10-27 09:13:24,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2018-10-27 09:13:24,701 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:24,701 INFO L375 BasicCegarLoop]: trace histogram [29, 29, 28, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:24,701 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:24,701 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:24,702 INFO L82 PathProgramCache]: Analyzing trace with hash -612030252, now seen corresponding path program 13 times [2018-10-27 09:13:24,702 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:24,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:24,702 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:24,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:24,703 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:24,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:25,460 INFO L134 CoverageAnalysis]: Checked inductivity of 1281 backedges. 0 proven. 1281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:25,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:25,460 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:25,460 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:25,461 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:25,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:25,461 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:25,469 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:25,469 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:13:25,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:25,512 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:25,555 INFO L134 CoverageAnalysis]: Checked inductivity of 1281 backedges. 0 proven. 1281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:25,555 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:27,052 INFO L134 CoverageAnalysis]: Checked inductivity of 1281 backedges. 0 proven. 1281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:27,072 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:27,072 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 76 [2018-10-27 09:13:27,072 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:27,073 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 09:13:27,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 09:13:27,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2566, Invalid=3134, Unknown=0, NotChecked=0, Total=5700 [2018-10-27 09:13:27,076 INFO L87 Difference]: Start difference. First operand 233 states and 262 transitions. Second operand 39 states. [2018-10-27 09:13:27,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:27,541 INFO L93 Difference]: Finished difference Result 351 states and 387 transitions. [2018-10-27 09:13:27,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-27 09:13:27,541 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 120 [2018-10-27 09:13:27,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:27,544 INFO L225 Difference]: With dead ends: 351 [2018-10-27 09:13:27,544 INFO L226 Difference]: Without dead ends: 345 [2018-10-27 09:13:27,547 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 203 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2572, Invalid=3280, Unknown=0, NotChecked=0, Total=5852 [2018-10-27 09:13:27,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 345 states. [2018-10-27 09:13:27,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 345 to 240. [2018-10-27 09:13:27,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2018-10-27 09:13:27,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 270 transitions. [2018-10-27 09:13:27,552 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 270 transitions. Word has length 120 [2018-10-27 09:13:27,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:27,553 INFO L481 AbstractCegarLoop]: Abstraction has 240 states and 270 transitions. [2018-10-27 09:13:27,553 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 09:13:27,553 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 270 transitions. [2018-10-27 09:13:27,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-10-27 09:13:27,554 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:27,554 INFO L375 BasicCegarLoop]: trace histogram [30, 30, 29, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:27,554 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:27,555 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:27,555 INFO L82 PathProgramCache]: Analyzing trace with hash -314283949, now seen corresponding path program 14 times [2018-10-27 09:13:27,555 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:27,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:27,556 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:27,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:27,556 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:27,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:29,183 INFO L134 CoverageAnalysis]: Checked inductivity of 1368 backedges. 0 proven. 1368 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:29,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:29,184 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:29,184 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:29,184 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:29,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:29,184 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:29,191 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:13:29,192 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:13:29,215 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-27 09:13:29,215 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:29,217 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:29,443 INFO L134 CoverageAnalysis]: Checked inductivity of 1368 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 1305 trivial. 0 not checked. [2018-10-27 09:13:29,443 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:29,764 INFO L134 CoverageAnalysis]: Checked inductivity of 1368 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 1305 trivial. 0 not checked. [2018-10-27 09:13:29,784 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:29,784 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 11, 11] total 56 [2018-10-27 09:13:29,784 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:29,784 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-27 09:13:29,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-27 09:13:29,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1336, Invalid=1744, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 09:13:29,786 INFO L87 Difference]: Start difference. First operand 240 states and 270 transitions. Second operand 47 states. [2018-10-27 09:13:31,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:31,416 INFO L93 Difference]: Finished difference Result 466 states and 517 transitions. [2018-10-27 09:13:31,417 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-27 09:13:31,417 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 123 [2018-10-27 09:13:31,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:31,420 INFO L225 Difference]: With dead ends: 466 [2018-10-27 09:13:31,420 INFO L226 Difference]: Without dead ends: 446 [2018-10-27 09:13:31,422 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 230 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1342, Invalid=1850, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 09:13:31,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2018-10-27 09:13:31,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 292. [2018-10-27 09:13:31,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2018-10-27 09:13:31,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 329 transitions. [2018-10-27 09:13:31,429 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 329 transitions. Word has length 123 [2018-10-27 09:13:31,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:31,430 INFO L481 AbstractCegarLoop]: Abstraction has 292 states and 329 transitions. [2018-10-27 09:13:31,430 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-27 09:13:31,430 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 329 transitions. [2018-10-27 09:13:31,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-10-27 09:13:31,431 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:31,431 INFO L375 BasicCegarLoop]: trace histogram [37, 37, 36, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:31,432 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:31,432 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:31,432 INFO L82 PathProgramCache]: Analyzing trace with hash -755226131, now seen corresponding path program 15 times [2018-10-27 09:13:31,432 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:31,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:31,433 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:31,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:31,433 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:31,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:32,279 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 0 proven. 2082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:32,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:32,280 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:32,280 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:32,280 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:32,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:32,280 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:32,288 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:13:32,288 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:13:32,340 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:13:32,340 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:32,344 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:32,415 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 0 proven. 2082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:32,416 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:35,352 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 0 proven. 2082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:35,373 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:35,374 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 94 [2018-10-27 09:13:35,374 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:35,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-27 09:13:35,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-27 09:13:35,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4015, Invalid=4727, Unknown=0, NotChecked=0, Total=8742 [2018-10-27 09:13:35,376 INFO L87 Difference]: Start difference. First operand 292 states and 329 transitions. Second operand 48 states. [2018-10-27 09:13:35,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:35,977 INFO L93 Difference]: Finished difference Result 438 states and 483 transitions. [2018-10-27 09:13:35,978 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-27 09:13:35,978 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 147 [2018-10-27 09:13:35,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:35,981 INFO L225 Difference]: With dead ends: 438 [2018-10-27 09:13:35,981 INFO L226 Difference]: Without dead ends: 432 [2018-10-27 09:13:35,982 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 248 SyntacticMatches, 1 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=4021, Invalid=4909, Unknown=0, NotChecked=0, Total=8930 [2018-10-27 09:13:35,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2018-10-27 09:13:35,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 299. [2018-10-27 09:13:35,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 299 states. [2018-10-27 09:13:35,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 337 transitions. [2018-10-27 09:13:35,989 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 337 transitions. Word has length 147 [2018-10-27 09:13:35,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:35,989 INFO L481 AbstractCegarLoop]: Abstraction has 299 states and 337 transitions. [2018-10-27 09:13:35,989 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-27 09:13:35,989 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 337 transitions. [2018-10-27 09:13:35,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-10-27 09:13:35,991 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:35,991 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 37, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:35,991 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:35,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:35,992 INFO L82 PathProgramCache]: Analyzing trace with hash -1973406962, now seen corresponding path program 16 times [2018-10-27 09:13:35,992 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:35,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:35,993 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:35,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:35,993 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:36,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:36,873 INFO L134 CoverageAnalysis]: Checked inductivity of 2193 backedges. 0 proven. 2193 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:36,873 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:36,873 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:36,873 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:36,873 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:36,873 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:36,874 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:36,881 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:36,881 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:13:36,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:36,936 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:37,006 INFO L134 CoverageAnalysis]: Checked inductivity of 2193 backedges. 0 proven. 2193 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:37,006 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:39,655 INFO L134 CoverageAnalysis]: Checked inductivity of 2193 backedges. 0 proven. 2193 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:39,676 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:39,676 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 96 [2018-10-27 09:13:39,676 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:39,676 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-27 09:13:39,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-27 09:13:39,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4196, Invalid=4924, Unknown=0, NotChecked=0, Total=9120 [2018-10-27 09:13:39,678 INFO L87 Difference]: Start difference. First operand 299 states and 337 transitions. Second operand 49 states. [2018-10-27 09:13:40,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:40,424 INFO L93 Difference]: Finished difference Result 445 states and 491 transitions. [2018-10-27 09:13:40,424 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-27 09:13:40,425 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 150 [2018-10-27 09:13:40,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:40,427 INFO L225 Difference]: With dead ends: 445 [2018-10-27 09:13:40,427 INFO L226 Difference]: Without dead ends: 439 [2018-10-27 09:13:40,429 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 253 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4202, Invalid=5110, Unknown=0, NotChecked=0, Total=9312 [2018-10-27 09:13:40,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 439 states. [2018-10-27 09:13:40,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 439 to 306. [2018-10-27 09:13:40,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 306 states. [2018-10-27 09:13:40,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 345 transitions. [2018-10-27 09:13:40,435 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 345 transitions. Word has length 150 [2018-10-27 09:13:40,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:40,436 INFO L481 AbstractCegarLoop]: Abstraction has 306 states and 345 transitions. [2018-10-27 09:13:40,436 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-27 09:13:40,436 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 345 transitions. [2018-10-27 09:13:40,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-10-27 09:13:40,437 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:40,437 INFO L375 BasicCegarLoop]: trace histogram [39, 39, 38, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:40,437 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:40,437 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:40,438 INFO L82 PathProgramCache]: Analyzing trace with hash -324892083, now seen corresponding path program 17 times [2018-10-27 09:13:40,438 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:40,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:40,438 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:40,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:40,439 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:40,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:41,683 INFO L134 CoverageAnalysis]: Checked inductivity of 2307 backedges. 0 proven. 2307 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:41,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:41,683 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:41,684 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:41,684 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:41,684 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:41,684 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:41,692 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:13:41,692 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:13:41,721 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-27 09:13:41,722 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:41,724 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:42,142 INFO L134 CoverageAnalysis]: Checked inductivity of 2307 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 2223 trivial. 0 not checked. [2018-10-27 09:13:42,142 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:43,042 INFO L134 CoverageAnalysis]: Checked inductivity of 2307 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 2223 trivial. 0 not checked. [2018-10-27 09:13:43,062 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:43,063 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 12, 12] total 68 [2018-10-27 09:13:43,063 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:43,065 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-27 09:13:43,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-27 09:13:43,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2026, Invalid=2530, Unknown=0, NotChecked=0, Total=4556 [2018-10-27 09:13:43,066 INFO L87 Difference]: Start difference. First operand 306 states and 345 transitions. Second operand 58 states. [2018-10-27 09:13:44,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:44,202 INFO L93 Difference]: Finished difference Result 587 states and 650 transitions. [2018-10-27 09:13:44,203 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-27 09:13:44,203 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 153 [2018-10-27 09:13:44,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:44,207 INFO L225 Difference]: With dead ends: 587 [2018-10-27 09:13:44,207 INFO L226 Difference]: Without dead ends: 565 [2018-10-27 09:13:44,208 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 288 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 273 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2032, Invalid=2660, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 09:13:44,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2018-10-27 09:13:44,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 365. [2018-10-27 09:13:44,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 365 states. [2018-10-27 09:13:44,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 412 transitions. [2018-10-27 09:13:44,216 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 412 transitions. Word has length 153 [2018-10-27 09:13:44,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:44,216 INFO L481 AbstractCegarLoop]: Abstraction has 365 states and 412 transitions. [2018-10-27 09:13:44,216 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-27 09:13:44,216 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 412 transitions. [2018-10-27 09:13:44,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2018-10-27 09:13:44,218 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:44,218 INFO L375 BasicCegarLoop]: trace histogram [47, 47, 46, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:44,218 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:44,218 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:44,219 INFO L82 PathProgramCache]: Analyzing trace with hash 752334548, now seen corresponding path program 18 times [2018-10-27 09:13:44,219 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:44,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:44,219 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:44,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:44,220 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:44,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:45,816 INFO L134 CoverageAnalysis]: Checked inductivity of 3351 backedges. 0 proven. 3351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:45,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:45,816 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:45,816 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:45,816 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:45,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:45,817 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:45,825 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:13:45,825 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:13:45,891 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:13:45,891 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:45,895 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:45,993 INFO L134 CoverageAnalysis]: Checked inductivity of 3351 backedges. 0 proven. 3351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:45,993 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:49,533 INFO L134 CoverageAnalysis]: Checked inductivity of 3351 backedges. 0 proven. 3351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:49,553 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:49,553 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-10-27 09:13:49,554 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:49,554 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-10-27 09:13:49,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-10-27 09:13:49,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6226, Invalid=7114, Unknown=0, NotChecked=0, Total=13340 [2018-10-27 09:13:49,558 INFO L87 Difference]: Start difference. First operand 365 states and 412 transitions. Second operand 59 states. [2018-10-27 09:13:50,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:50,799 INFO L93 Difference]: Finished difference Result 542 states and 598 transitions. [2018-10-27 09:13:50,803 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-27 09:13:50,804 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 180 [2018-10-27 09:13:50,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:50,806 INFO L225 Difference]: With dead ends: 542 [2018-10-27 09:13:50,807 INFO L226 Difference]: Without dead ends: 536 [2018-10-27 09:13:50,808 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 303 SyntacticMatches, 1 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=6232, Invalid=7340, Unknown=0, NotChecked=0, Total=13572 [2018-10-27 09:13:50,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 536 states. [2018-10-27 09:13:50,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 536 to 372. [2018-10-27 09:13:50,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372 states. [2018-10-27 09:13:50,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 420 transitions. [2018-10-27 09:13:50,815 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 420 transitions. Word has length 180 [2018-10-27 09:13:50,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:50,816 INFO L481 AbstractCegarLoop]: Abstraction has 372 states and 420 transitions. [2018-10-27 09:13:50,816 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-10-27 09:13:50,816 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 420 transitions. [2018-10-27 09:13:50,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-10-27 09:13:50,817 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:50,817 INFO L375 BasicCegarLoop]: trace histogram [48, 48, 47, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:50,818 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:50,818 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:50,818 INFO L82 PathProgramCache]: Analyzing trace with hash -252635693, now seen corresponding path program 19 times [2018-10-27 09:13:50,818 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:50,819 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:50,819 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:13:50,819 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:50,819 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:50,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:52,269 INFO L134 CoverageAnalysis]: Checked inductivity of 3492 backedges. 0 proven. 3492 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:52,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:52,269 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:52,269 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:52,270 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:52,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:52,270 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:52,278 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:52,278 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:13:52,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:52,339 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:52,429 INFO L134 CoverageAnalysis]: Checked inductivity of 3492 backedges. 0 proven. 3492 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:52,430 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:13:56,174 INFO L134 CoverageAnalysis]: Checked inductivity of 3492 backedges. 0 proven. 3492 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:56,195 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:13:56,195 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 118 [2018-10-27 09:13:56,195 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:13:56,195 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-27 09:13:56,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-27 09:13:56,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6451, Invalid=7355, Unknown=0, NotChecked=0, Total=13806 [2018-10-27 09:13:56,197 INFO L87 Difference]: Start difference. First operand 372 states and 420 transitions. Second operand 60 states. [2018-10-27 09:13:57,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:13:57,538 INFO L93 Difference]: Finished difference Result 549 states and 606 transitions. [2018-10-27 09:13:57,538 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-10-27 09:13:57,538 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 183 [2018-10-27 09:13:57,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:13:57,541 INFO L225 Difference]: With dead ends: 549 [2018-10-27 09:13:57,541 INFO L226 Difference]: Without dead ends: 543 [2018-10-27 09:13:57,542 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 308 SyntacticMatches, 1 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=6457, Invalid=7585, Unknown=0, NotChecked=0, Total=14042 [2018-10-27 09:13:57,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 543 states. [2018-10-27 09:13:57,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 543 to 379. [2018-10-27 09:13:57,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 379 states. [2018-10-27 09:13:57,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 428 transitions. [2018-10-27 09:13:57,549 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 428 transitions. Word has length 183 [2018-10-27 09:13:57,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:13:57,550 INFO L481 AbstractCegarLoop]: Abstraction has 379 states and 428 transitions. [2018-10-27 09:13:57,550 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-27 09:13:57,550 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 428 transitions. [2018-10-27 09:13:57,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-27 09:13:57,551 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:13:57,552 INFO L375 BasicCegarLoop]: trace histogram [49, 49, 48, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:13:57,552 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:13:57,552 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:13:57,552 INFO L82 PathProgramCache]: Analyzing trace with hash 895935092, now seen corresponding path program 20 times [2018-10-27 09:13:57,552 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:13:57,553 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:57,553 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:13:57,553 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:13:57,553 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:13:57,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:13:59,153 INFO L134 CoverageAnalysis]: Checked inductivity of 3636 backedges. 0 proven. 3636 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:13:59,153 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:59,153 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:13:59,153 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:13:59,154 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:13:59,154 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:13:59,154 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:13:59,161 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:13:59,161 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:13:59,193 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 09:13:59,193 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:13:59,195 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:13:59,825 INFO L134 CoverageAnalysis]: Checked inductivity of 3636 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 3528 trivial. 0 not checked. [2018-10-27 09:13:59,825 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:00,370 INFO L134 CoverageAnalysis]: Checked inductivity of 3636 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 3528 trivial. 0 not checked. [2018-10-27 09:14:00,391 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:00,391 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 13, 13] total 81 [2018-10-27 09:14:00,391 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:00,392 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-27 09:14:00,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-27 09:14:00,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2936, Invalid=3544, Unknown=0, NotChecked=0, Total=6480 [2018-10-27 09:14:00,393 INFO L87 Difference]: Start difference. First operand 379 states and 428 transitions. Second operand 70 states. [2018-10-27 09:14:03,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:03,540 INFO L93 Difference]: Finished difference Result 721 states and 797 transitions. [2018-10-27 09:14:03,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-27 09:14:03,541 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 186 [2018-10-27 09:14:03,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:03,546 INFO L225 Difference]: With dead ends: 721 [2018-10-27 09:14:03,546 INFO L226 Difference]: Without dead ends: 697 [2018-10-27 09:14:03,547 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 352 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 334 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2942, Invalid=3700, Unknown=0, NotChecked=0, Total=6642 [2018-10-27 09:14:03,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2018-10-27 09:14:03,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 445. [2018-10-27 09:14:03,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 445 states. [2018-10-27 09:14:03,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 503 transitions. [2018-10-27 09:14:03,556 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 503 transitions. Word has length 186 [2018-10-27 09:14:03,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:03,556 INFO L481 AbstractCegarLoop]: Abstraction has 445 states and 503 transitions. [2018-10-27 09:14:03,557 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-27 09:14:03,557 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 503 transitions. [2018-10-27 09:14:03,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2018-10-27 09:14:03,558 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:03,558 INFO L375 BasicCegarLoop]: trace histogram [58, 58, 57, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:03,559 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:03,559 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:03,559 INFO L82 PathProgramCache]: Analyzing trace with hash 1102113070, now seen corresponding path program 21 times [2018-10-27 09:14:03,559 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:03,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:03,560 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:14:03,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:03,560 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:03,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:05,784 INFO L134 CoverageAnalysis]: Checked inductivity of 5094 backedges. 0 proven. 5094 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:14:05,784 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:05,784 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:05,784 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:05,784 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:05,784 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:05,784 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:05,793 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:14:05,793 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:14:05,862 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:14:05,863 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:14:05,867 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:05,989 INFO L134 CoverageAnalysis]: Checked inductivity of 5094 backedges. 0 proven. 5094 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:14:05,990 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:11,454 INFO L134 CoverageAnalysis]: Checked inductivity of 5094 backedges. 0 proven. 5094 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:14:11,475 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:11,476 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 140 [2018-10-27 09:14:11,476 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:11,476 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-10-27 09:14:11,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-10-27 09:14:11,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9190, Invalid=10270, Unknown=0, NotChecked=0, Total=19460 [2018-10-27 09:14:11,478 INFO L87 Difference]: Start difference. First operand 445 states and 503 transitions. Second operand 71 states. [2018-10-27 09:14:13,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:13,698 INFO L93 Difference]: Finished difference Result 656 states and 724 transitions. [2018-10-27 09:14:13,698 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-27 09:14:13,698 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 216 [2018-10-27 09:14:13,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:13,702 INFO L225 Difference]: With dead ends: 656 [2018-10-27 09:14:13,702 INFO L226 Difference]: Without dead ends: 650 [2018-10-27 09:14:13,704 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 363 SyntacticMatches, 1 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=9196, Invalid=10544, Unknown=0, NotChecked=0, Total=19740 [2018-10-27 09:14:13,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 650 states. [2018-10-27 09:14:13,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 650 to 452. [2018-10-27 09:14:13,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 452 states. [2018-10-27 09:14:13,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 511 transitions. [2018-10-27 09:14:13,712 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 511 transitions. Word has length 216 [2018-10-27 09:14:13,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:13,712 INFO L481 AbstractCegarLoop]: Abstraction has 452 states and 511 transitions. [2018-10-27 09:14:13,713 INFO L482 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-10-27 09:14:13,713 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 511 transitions. [2018-10-27 09:14:13,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2018-10-27 09:14:13,714 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:13,715 INFO L375 BasicCegarLoop]: trace histogram [59, 59, 58, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:13,715 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:13,715 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:13,715 INFO L82 PathProgramCache]: Analyzing trace with hash -518064979, now seen corresponding path program 22 times [2018-10-27 09:14:13,715 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:13,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:13,716 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:14:13,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:13,716 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:13,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:15,831 INFO L134 CoverageAnalysis]: Checked inductivity of 5268 backedges. 0 proven. 5268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:14:15,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:15,831 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:15,832 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:15,832 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:15,832 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:15,832 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:15,848 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:14:15,848 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:14:15,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:15,925 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:16,015 INFO L134 CoverageAnalysis]: Checked inductivity of 5268 backedges. 0 proven. 5268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:14:16,015 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:21,733 INFO L134 CoverageAnalysis]: Checked inductivity of 5268 backedges. 0 proven. 5268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:14:21,765 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:21,766 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 142 [2018-10-27 09:14:21,766 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:21,766 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-10-27 09:14:21,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-10-27 09:14:21,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9463, Invalid=10559, Unknown=0, NotChecked=0, Total=20022 [2018-10-27 09:14:21,769 INFO L87 Difference]: Start difference. First operand 452 states and 511 transitions. Second operand 72 states. [2018-10-27 09:14:24,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:24,083 INFO L93 Difference]: Finished difference Result 663 states and 732 transitions. [2018-10-27 09:14:24,083 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-10-27 09:14:24,083 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 219 [2018-10-27 09:14:24,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:24,087 INFO L225 Difference]: With dead ends: 663 [2018-10-27 09:14:24,087 INFO L226 Difference]: Without dead ends: 657 [2018-10-27 09:14:24,088 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 368 SyntacticMatches, 1 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=9469, Invalid=10837, Unknown=0, NotChecked=0, Total=20306 [2018-10-27 09:14:24,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 657 states. [2018-10-27 09:14:24,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 657 to 459. [2018-10-27 09:14:24,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 459 states. [2018-10-27 09:14:24,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 519 transitions. [2018-10-27 09:14:24,096 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 519 transitions. Word has length 219 [2018-10-27 09:14:24,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:24,096 INFO L481 AbstractCegarLoop]: Abstraction has 459 states and 519 transitions. [2018-10-27 09:14:24,096 INFO L482 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-10-27 09:14:24,096 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 519 transitions. [2018-10-27 09:14:24,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-10-27 09:14:24,098 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:24,098 INFO L375 BasicCegarLoop]: trace histogram [60, 60, 59, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:24,098 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:24,099 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:24,099 INFO L82 PathProgramCache]: Analyzing trace with hash -399850290, now seen corresponding path program 23 times [2018-10-27 09:14:24,099 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:24,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:24,100 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:14:24,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:24,100 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:24,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:26,637 INFO L134 CoverageAnalysis]: Checked inductivity of 5445 backedges. 0 proven. 5445 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:14:26,638 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:26,638 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:26,638 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:26,638 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:26,638 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:26,638 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:26,647 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:14:26,648 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:14:26,797 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-27 09:14:26,797 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:14:26,801 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:27,427 INFO L134 CoverageAnalysis]: Checked inductivity of 5445 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 5310 trivial. 0 not checked. [2018-10-27 09:14:27,428 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:28,140 INFO L134 CoverageAnalysis]: Checked inductivity of 5445 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 5310 trivial. 0 not checked. [2018-10-27 09:14:28,161 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:28,161 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 14, 14] total 95 [2018-10-27 09:14:28,161 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:28,162 INFO L460 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-10-27 09:14:28,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-10-27 09:14:28,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4105, Invalid=4825, Unknown=0, NotChecked=0, Total=8930 [2018-10-27 09:14:28,164 INFO L87 Difference]: Start difference. First operand 459 states and 519 transitions. Second operand 83 states. [2018-10-27 09:14:30,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:30,799 INFO L93 Difference]: Finished difference Result 868 states and 958 transitions. [2018-10-27 09:14:30,799 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-10-27 09:14:30,799 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 222 [2018-10-27 09:14:30,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:30,803 INFO L225 Difference]: With dead ends: 868 [2018-10-27 09:14:30,803 INFO L226 Difference]: Without dead ends: 842 [2018-10-27 09:14:30,804 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 422 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=4111, Invalid=5009, Unknown=0, NotChecked=0, Total=9120 [2018-10-27 09:14:30,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 842 states. [2018-10-27 09:14:30,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 842 to 532. [2018-10-27 09:14:30,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 532 states. [2018-10-27 09:14:30,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 602 transitions. [2018-10-27 09:14:30,814 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 602 transitions. Word has length 222 [2018-10-27 09:14:30,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:30,814 INFO L481 AbstractCegarLoop]: Abstraction has 532 states and 602 transitions. [2018-10-27 09:14:30,814 INFO L482 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-10-27 09:14:30,815 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 602 transitions. [2018-10-27 09:14:30,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2018-10-27 09:14:30,816 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:30,817 INFO L375 BasicCegarLoop]: trace histogram [70, 70, 69, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:30,817 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:30,817 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:30,817 INFO L82 PathProgramCache]: Analyzing trace with hash -1768862701, now seen corresponding path program 24 times [2018-10-27 09:14:30,817 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:30,818 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:30,818 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:14:30,818 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:30,819 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:30,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:33,549 INFO L134 CoverageAnalysis]: Checked inductivity of 7410 backedges. 0 proven. 7410 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:14:33,549 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:33,549 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:33,550 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:33,550 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:33,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:33,550 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:33,559 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:14:33,559 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:14:33,642 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:14:33,642 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:14:33,647 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:33,883 INFO L134 CoverageAnalysis]: Checked inductivity of 7410 backedges. 0 proven. 7410 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:14:33,884 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:41,674 INFO L134 CoverageAnalysis]: Checked inductivity of 7410 backedges. 0 proven. 7410 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:14:41,696 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:41,696 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 166 [2018-10-27 09:14:41,696 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:41,697 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2018-10-27 09:14:41,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2018-10-27 09:14:41,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13051, Invalid=14339, Unknown=0, NotChecked=0, Total=27390 [2018-10-27 09:14:41,700 INFO L87 Difference]: Start difference. First operand 532 states and 602 transitions. Second operand 84 states. [2018-10-27 09:14:44,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:44,686 INFO L93 Difference]: Finished difference Result 780 states and 861 transitions. [2018-10-27 09:14:44,687 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2018-10-27 09:14:44,687 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 255 [2018-10-27 09:14:44,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:44,692 INFO L225 Difference]: With dead ends: 780 [2018-10-27 09:14:44,692 INFO L226 Difference]: Without dead ends: 774 [2018-10-27 09:14:44,694 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 594 GetRequests, 428 SyntacticMatches, 1 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 635 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=13057, Invalid=14665, Unknown=0, NotChecked=0, Total=27722 [2018-10-27 09:14:44,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 774 states. [2018-10-27 09:14:44,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 774 to 539. [2018-10-27 09:14:44,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 539 states. [2018-10-27 09:14:44,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 610 transitions. [2018-10-27 09:14:44,705 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 610 transitions. Word has length 255 [2018-10-27 09:14:44,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:44,706 INFO L481 AbstractCegarLoop]: Abstraction has 539 states and 610 transitions. [2018-10-27 09:14:44,706 INFO L482 AbstractCegarLoop]: Interpolant automaton has 84 states. [2018-10-27 09:14:44,706 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 610 transitions. [2018-10-27 09:14:44,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-10-27 09:14:44,708 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:44,708 INFO L375 BasicCegarLoop]: trace histogram [71, 71, 70, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:44,709 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:44,709 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:44,709 INFO L82 PathProgramCache]: Analyzing trace with hash 412573620, now seen corresponding path program 25 times [2018-10-27 09:14:44,709 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:44,710 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:44,710 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:14:44,710 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:44,710 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:44,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:47,955 INFO L134 CoverageAnalysis]: Checked inductivity of 7620 backedges. 0 proven. 7620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:14:47,956 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:47,956 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:14:47,956 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:14:47,956 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:14:47,956 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:14:47,956 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:14:47,966 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:14:47,966 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:14:48,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:14:48,052 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:14:48,245 INFO L134 CoverageAnalysis]: Checked inductivity of 7620 backedges. 0 proven. 7620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:14:48,245 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:14:56,212 INFO L134 CoverageAnalysis]: Checked inductivity of 7620 backedges. 0 proven. 7620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:14:56,251 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:14:56,251 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 168 [2018-10-27 09:14:56,251 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:14:56,252 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2018-10-27 09:14:56,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2018-10-27 09:14:56,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13376, Invalid=14680, Unknown=0, NotChecked=0, Total=28056 [2018-10-27 09:14:56,254 INFO L87 Difference]: Start difference. First operand 539 states and 610 transitions. Second operand 85 states. [2018-10-27 09:14:59,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:14:59,933 INFO L93 Difference]: Finished difference Result 787 states and 869 transitions. [2018-10-27 09:14:59,933 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-10-27 09:14:59,933 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 258 [2018-10-27 09:14:59,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:14:59,938 INFO L225 Difference]: With dead ends: 787 [2018-10-27 09:14:59,938 INFO L226 Difference]: Without dead ends: 781 [2018-10-27 09:14:59,939 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 433 SyntacticMatches, 1 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 643 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=13382, Invalid=15010, Unknown=0, NotChecked=0, Total=28392 [2018-10-27 09:14:59,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 781 states. [2018-10-27 09:14:59,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 781 to 546. [2018-10-27 09:14:59,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 546 states. [2018-10-27 09:14:59,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 546 states to 546 states and 618 transitions. [2018-10-27 09:14:59,948 INFO L78 Accepts]: Start accepts. Automaton has 546 states and 618 transitions. Word has length 258 [2018-10-27 09:14:59,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:14:59,948 INFO L481 AbstractCegarLoop]: Abstraction has 546 states and 618 transitions. [2018-10-27 09:14:59,948 INFO L482 AbstractCegarLoop]: Interpolant automaton has 85 states. [2018-10-27 09:14:59,948 INFO L276 IsEmpty]: Start isEmpty. Operand 546 states and 618 transitions. [2018-10-27 09:14:59,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2018-10-27 09:14:59,950 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:14:59,951 INFO L375 BasicCegarLoop]: trace histogram [72, 72, 71, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:14:59,951 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:14:59,951 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:14:59,951 INFO L82 PathProgramCache]: Analyzing trace with hash 431856755, now seen corresponding path program 26 times [2018-10-27 09:14:59,951 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:14:59,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:59,952 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:14:59,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:14:59,952 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:14:59,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:03,375 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 7833 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:15:03,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:03,375 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:15:03,376 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:15:03,376 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:15:03,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:03,376 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:15:03,387 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:15:03,388 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:15:03,484 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-27 09:15:03,485 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:15:03,488 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:15:05,287 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 7668 trivial. 0 not checked. [2018-10-27 09:15:05,287 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:15:06,474 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 7668 trivial. 0 not checked. [2018-10-27 09:15:06,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:15:06,495 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 15, 15] total 110 [2018-10-27 09:15:06,495 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:15:06,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 97 states [2018-10-27 09:15:06,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2018-10-27 09:15:06,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5575, Invalid=6415, Unknown=0, NotChecked=0, Total=11990 [2018-10-27 09:15:06,497 INFO L87 Difference]: Start difference. First operand 546 states and 618 transitions. Second operand 97 states. [2018-10-27 09:15:10,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:15:10,739 INFO L93 Difference]: Finished difference Result 1028 states and 1133 transitions. [2018-10-27 09:15:10,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2018-10-27 09:15:10,740 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 261 [2018-10-27 09:15:10,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:15:10,745 INFO L225 Difference]: With dead ends: 1028 [2018-10-27 09:15:10,745 INFO L226 Difference]: Without dead ends: 1000 [2018-10-27 09:15:10,747 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 608 GetRequests, 498 SyntacticMatches, 1 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 471 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=5581, Invalid=6629, Unknown=0, NotChecked=0, Total=12210 [2018-10-27 09:15:10,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1000 states. [2018-10-27 09:15:10,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1000 to 626. [2018-10-27 09:15:10,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 626 states. [2018-10-27 09:15:10,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 626 states to 626 states and 709 transitions. [2018-10-27 09:15:10,757 INFO L78 Accepts]: Start accepts. Automaton has 626 states and 709 transitions. Word has length 261 [2018-10-27 09:15:10,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:15:10,757 INFO L481 AbstractCegarLoop]: Abstraction has 626 states and 709 transitions. [2018-10-27 09:15:10,757 INFO L482 AbstractCegarLoop]: Interpolant automaton has 97 states. [2018-10-27 09:15:10,757 INFO L276 IsEmpty]: Start isEmpty. Operand 626 states and 709 transitions. [2018-10-27 09:15:10,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2018-10-27 09:15:10,760 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:10,760 INFO L375 BasicCegarLoop]: trace histogram [83, 83, 82, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:10,761 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:10,761 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:10,761 INFO L82 PathProgramCache]: Analyzing trace with hash -1637142579, now seen corresponding path program 27 times [2018-10-27 09:15:10,761 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:10,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:10,762 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:15:10,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:10,762 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:10,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:14,271 INFO L134 CoverageAnalysis]: Checked inductivity of 10407 backedges. 0 proven. 10407 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:15:14,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:14,272 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:15:14,272 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:15:14,272 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:15:14,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:14,272 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:15:14,287 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:15:14,288 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:15:14,381 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:15:14,381 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:15:14,388 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:15:14,520 INFO L134 CoverageAnalysis]: Checked inductivity of 10407 backedges. 0 proven. 10407 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:15:14,520 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:15:25,130 INFO L134 CoverageAnalysis]: Checked inductivity of 10407 backedges. 0 proven. 10407 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:15:25,152 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:15:25,152 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98, 98] total 194 [2018-10-27 09:15:25,152 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:15:25,153 INFO L460 AbstractCegarLoop]: Interpolant automaton has 98 states [2018-10-27 09:15:25,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2018-10-27 09:15:25,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17965, Invalid=19477, Unknown=0, NotChecked=0, Total=37442 [2018-10-27 09:15:25,155 INFO L87 Difference]: Start difference. First operand 626 states and 709 transitions. Second operand 98 states. [2018-10-27 09:15:30,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:15:30,540 INFO L93 Difference]: Finished difference Result 914 states and 1009 transitions. [2018-10-27 09:15:30,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2018-10-27 09:15:30,541 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 297 [2018-10-27 09:15:30,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:15:30,546 INFO L225 Difference]: With dead ends: 914 [2018-10-27 09:15:30,546 INFO L226 Difference]: Without dead ends: 908 [2018-10-27 09:15:30,547 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 692 GetRequests, 498 SyntacticMatches, 1 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 747 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=17971, Invalid=19859, Unknown=0, NotChecked=0, Total=37830 [2018-10-27 09:15:30,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 908 states. [2018-10-27 09:15:30,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 908 to 633. [2018-10-27 09:15:30,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 633 states. [2018-10-27 09:15:30,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 633 states to 633 states and 717 transitions. [2018-10-27 09:15:30,556 INFO L78 Accepts]: Start accepts. Automaton has 633 states and 717 transitions. Word has length 297 [2018-10-27 09:15:30,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:15:30,557 INFO L481 AbstractCegarLoop]: Abstraction has 633 states and 717 transitions. [2018-10-27 09:15:30,557 INFO L482 AbstractCegarLoop]: Interpolant automaton has 98 states. [2018-10-27 09:15:30,557 INFO L276 IsEmpty]: Start isEmpty. Operand 633 states and 717 transitions. [2018-10-27 09:15:30,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2018-10-27 09:15:30,559 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:30,559 INFO L375 BasicCegarLoop]: trace histogram [84, 84, 83, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:30,559 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:30,560 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:30,560 INFO L82 PathProgramCache]: Analyzing trace with hash 1112549934, now seen corresponding path program 28 times [2018-10-27 09:15:30,560 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:30,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:30,561 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:15:30,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:30,561 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:30,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:34,344 INFO L134 CoverageAnalysis]: Checked inductivity of 10656 backedges. 0 proven. 10656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:15:34,344 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:34,344 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:15:34,344 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:15:34,345 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:15:34,345 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:34,345 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:15:34,352 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:15:34,352 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:15:34,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:34,448 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:15:34,607 INFO L134 CoverageAnalysis]: Checked inductivity of 10656 backedges. 0 proven. 10656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:15:34,608 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:15:45,134 INFO L134 CoverageAnalysis]: Checked inductivity of 10656 backedges. 0 proven. 10656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:15:45,155 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:15:45,155 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 196 [2018-10-27 09:15:45,155 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:15:45,155 INFO L460 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-10-27 09:15:45,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-10-27 09:15:45,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18346, Invalid=19874, Unknown=0, NotChecked=0, Total=38220 [2018-10-27 09:15:45,158 INFO L87 Difference]: Start difference. First operand 633 states and 717 transitions. Second operand 99 states. [2018-10-27 09:15:50,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:15:50,581 INFO L93 Difference]: Finished difference Result 921 states and 1017 transitions. [2018-10-27 09:15:50,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-10-27 09:15:50,581 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 300 [2018-10-27 09:15:50,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:15:50,585 INFO L225 Difference]: With dead ends: 921 [2018-10-27 09:15:50,585 INFO L226 Difference]: Without dead ends: 915 [2018-10-27 09:15:50,587 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 699 GetRequests, 503 SyntacticMatches, 1 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 755 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=18352, Invalid=20260, Unknown=0, NotChecked=0, Total=38612 [2018-10-27 09:15:50,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 915 states. [2018-10-27 09:15:50,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 915 to 640. [2018-10-27 09:15:50,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 640 states. [2018-10-27 09:15:50,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 725 transitions. [2018-10-27 09:15:50,596 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 725 transitions. Word has length 300 [2018-10-27 09:15:50,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:15:50,596 INFO L481 AbstractCegarLoop]: Abstraction has 640 states and 725 transitions. [2018-10-27 09:15:50,596 INFO L482 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-10-27 09:15:50,596 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 725 transitions. [2018-10-27 09:15:50,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 304 [2018-10-27 09:15:50,598 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:50,599 INFO L375 BasicCegarLoop]: trace histogram [85, 85, 84, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:50,599 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:50,599 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:50,599 INFO L82 PathProgramCache]: Analyzing trace with hash -709031891, now seen corresponding path program 29 times [2018-10-27 09:15:50,600 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:50,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:50,600 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:15:50,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:50,601 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:50,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:55,508 INFO L134 CoverageAnalysis]: Checked inductivity of 10908 backedges. 0 proven. 10908 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:15:55,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:55,509 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:15:55,509 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:15:55,509 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:15:55,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:55,509 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:15:55,516 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:15:55,517 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:15:55,561 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 09:15:55,561 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:15:55,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:15:56,685 INFO L134 CoverageAnalysis]: Checked inductivity of 10908 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 10710 trivial. 0 not checked. [2018-10-27 09:15:56,685 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:15:58,128 INFO L134 CoverageAnalysis]: Checked inductivity of 10908 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 10710 trivial. 0 not checked. [2018-10-27 09:15:58,149 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:15:58,149 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 16, 16] total 126 [2018-10-27 09:15:58,149 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:15:58,150 INFO L460 AbstractCegarLoop]: Interpolant automaton has 112 states [2018-10-27 09:15:58,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2018-10-27 09:15:58,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7391, Invalid=8359, Unknown=0, NotChecked=0, Total=15750 [2018-10-27 09:15:58,151 INFO L87 Difference]: Start difference. First operand 640 states and 725 transitions. Second operand 112 states. [2018-10-27 09:16:03,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:03,271 INFO L93 Difference]: Finished difference Result 1201 states and 1322 transitions. [2018-10-27 09:16:03,271 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2018-10-27 09:16:03,271 INFO L78 Accepts]: Start accepts. Automaton has 112 states. Word has length 303 [2018-10-27 09:16:03,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:03,277 INFO L225 Difference]: With dead ends: 1201 [2018-10-27 09:16:03,277 INFO L226 Difference]: Without dead ends: 1171 [2018-10-27 09:16:03,279 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 706 GetRequests, 580 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=7397, Invalid=8605, Unknown=0, NotChecked=0, Total=16002 [2018-10-27 09:16:03,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1171 states. [2018-10-27 09:16:03,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1171 to 727. [2018-10-27 09:16:03,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 727 states. [2018-10-27 09:16:03,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 727 states to 727 states and 824 transitions. [2018-10-27 09:16:03,290 INFO L78 Accepts]: Start accepts. Automaton has 727 states and 824 transitions. Word has length 303 [2018-10-27 09:16:03,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:03,291 INFO L481 AbstractCegarLoop]: Abstraction has 727 states and 824 transitions. [2018-10-27 09:16:03,291 INFO L482 AbstractCegarLoop]: Interpolant automaton has 112 states. [2018-10-27 09:16:03,291 INFO L276 IsEmpty]: Start isEmpty. Operand 727 states and 824 transitions. [2018-10-27 09:16:03,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 343 [2018-10-27 09:16:03,294 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:03,294 INFO L375 BasicCegarLoop]: trace histogram [97, 97, 96, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:03,294 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:03,294 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:03,295 INFO L82 PathProgramCache]: Analyzing trace with hash -1992803276, now seen corresponding path program 30 times [2018-10-27 09:16:03,295 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:03,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:03,296 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:03,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:03,296 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:03,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:09,401 INFO L134 CoverageAnalysis]: Checked inductivity of 14202 backedges. 0 proven. 14202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:09,401 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:09,401 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:09,402 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:09,402 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:09,402 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:09,402 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:09,411 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:16:09,411 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:16:09,528 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:16:09,529 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:09,535 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:09,792 INFO L134 CoverageAnalysis]: Checked inductivity of 14202 backedges. 0 proven. 14202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:09,792 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:22,371 INFO L134 CoverageAnalysis]: Checked inductivity of 14202 backedges. 0 proven. 14202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:22,393 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:22,394 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [113, 113, 113] total 206 [2018-10-27 09:16:22,394 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:22,394 INFO L460 AbstractCegarLoop]: Interpolant automaton has 113 states [2018-10-27 09:16:22,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2018-10-27 09:16:22,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20311, Invalid=21919, Unknown=0, NotChecked=0, Total=42230 [2018-10-27 09:16:22,397 INFO L87 Difference]: Start difference. First operand 727 states and 824 transitions. Second operand 113 states. [2018-10-27 09:16:30,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:30,602 INFO L93 Difference]: Finished difference Result 893 states and 1003 transitions. [2018-10-27 09:16:30,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2018-10-27 09:16:30,603 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 342 [2018-10-27 09:16:30,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:30,607 INFO L225 Difference]: With dead ends: 893 [2018-10-27 09:16:30,608 INFO L226 Difference]: Without dead ends: 887 [2018-10-27 09:16:30,609 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 797 GetRequests, 573 SyntacticMatches, 19 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2604 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=20317, Invalid=22325, Unknown=0, NotChecked=0, Total=42642 [2018-10-27 09:16:30,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 887 states. [2018-10-27 09:16:30,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 887 to 734. [2018-10-27 09:16:30,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 734 states. [2018-10-27 09:16:30,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 734 states to 734 states and 832 transitions. [2018-10-27 09:16:30,620 INFO L78 Accepts]: Start accepts. Automaton has 734 states and 832 transitions. Word has length 342 [2018-10-27 09:16:30,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:30,620 INFO L481 AbstractCegarLoop]: Abstraction has 734 states and 832 transitions. [2018-10-27 09:16:30,620 INFO L482 AbstractCegarLoop]: Interpolant automaton has 113 states. [2018-10-27 09:16:30,621 INFO L276 IsEmpty]: Start isEmpty. Operand 734 states and 832 transitions. [2018-10-27 09:16:30,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2018-10-27 09:16:30,623 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:30,624 INFO L375 BasicCegarLoop]: trace histogram [98, 98, 97, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:30,624 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:30,624 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:30,624 INFO L82 PathProgramCache]: Analyzing trace with hash -294769805, now seen corresponding path program 31 times [2018-10-27 09:16:30,625 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:30,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:30,625 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:30,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:30,626 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:30,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:35,982 INFO L134 CoverageAnalysis]: Checked inductivity of 14493 backedges. 0 proven. 14493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:35,982 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:35,982 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:35,982 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:35,983 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:35,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:35,983 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:35,991 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:35,991 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:16:36,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:36,109 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:36,336 INFO L134 CoverageAnalysis]: Checked inductivity of 14493 backedges. 0 proven. 14493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:36,336 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:48,937 INFO L134 CoverageAnalysis]: Checked inductivity of 14493 backedges. 0 proven. 14493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:48,958 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:48,958 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [114, 114, 114] total 206 [2018-10-27 09:16:48,958 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:48,959 INFO L460 AbstractCegarLoop]: Interpolant automaton has 114 states [2018-10-27 09:16:48,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2018-10-27 09:16:48,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20311, Invalid=21919, Unknown=0, NotChecked=0, Total=42230 [2018-10-27 09:16:48,961 INFO L87 Difference]: Start difference. First operand 734 states and 832 transitions. Second operand 114 states. [2018-10-27 09:16:55,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:55,850 INFO L93 Difference]: Finished difference Result 867 states and 978 transitions. [2018-10-27 09:16:55,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2018-10-27 09:16:55,851 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 345 [2018-10-27 09:16:55,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:55,854 INFO L225 Difference]: With dead ends: 867 [2018-10-27 09:16:55,854 INFO L226 Difference]: Without dead ends: 861 [2018-10-27 09:16:55,855 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 804 GetRequests, 578 SyntacticMatches, 21 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2805 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=20317, Invalid=22325, Unknown=0, NotChecked=0, Total=42642 [2018-10-27 09:16:55,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 861 states. [2018-10-27 09:16:55,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 861 to 741. [2018-10-27 09:16:55,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 741 states. [2018-10-27 09:16:55,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 741 states to 741 states and 840 transitions. [2018-10-27 09:16:55,865 INFO L78 Accepts]: Start accepts. Automaton has 741 states and 840 transitions. Word has length 345 [2018-10-27 09:16:55,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:55,866 INFO L481 AbstractCegarLoop]: Abstraction has 741 states and 840 transitions. [2018-10-27 09:16:55,866 INFO L482 AbstractCegarLoop]: Interpolant automaton has 114 states. [2018-10-27 09:16:55,866 INFO L276 IsEmpty]: Start isEmpty. Operand 741 states and 840 transitions. [2018-10-27 09:16:55,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 349 [2018-10-27 09:16:55,869 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:55,869 INFO L375 BasicCegarLoop]: trace histogram [99, 99, 98, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:55,869 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:55,869 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:55,869 INFO L82 PathProgramCache]: Analyzing trace with hash -304447532, now seen corresponding path program 32 times [2018-10-27 09:16:55,870 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:55,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:55,870 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:55,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:55,871 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:55,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:00,979 INFO L134 CoverageAnalysis]: Checked inductivity of 14787 backedges. 0 proven. 14787 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:00,979 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:00,979 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:00,979 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:00,980 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:00,980 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:00,980 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:00,988 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:17:00,988 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:17:01,162 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-10-27 09:17:01,162 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:17:01,166 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:02,099 INFO L134 CoverageAnalysis]: Checked inductivity of 14787 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 14553 trivial. 0 not checked. [2018-10-27 09:17:02,100 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:03,433 INFO L134 CoverageAnalysis]: Checked inductivity of 14787 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 14553 trivial. 0 not checked. [2018-10-27 09:17:03,453 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:03,454 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [115, 17, 17] total 131 [2018-10-27 09:17:03,454 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:03,454 INFO L460 AbstractCegarLoop]: Interpolant automaton has 116 states [2018-10-27 09:17:03,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2018-10-27 09:17:03,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8011, Invalid=9019, Unknown=0, NotChecked=0, Total=17030 [2018-10-27 09:17:03,456 INFO L87 Difference]: Start difference. First operand 741 states and 840 transitions. Second operand 116 states. Received shutdown request... [2018-10-27 09:17:04,745 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-27 09:17:04,745 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-27 09:17:04,751 WARN L205 ceAbstractionStarter]: Timeout [2018-10-27 09:17:04,751 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 09:17:04 BoogieIcfgContainer [2018-10-27 09:17:04,751 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-27 09:17:04,752 INFO L168 Benchmark]: Toolchain (without parser) took 241905.47 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 832.0 MB). Free memory was 1.4 GB in the beginning and 2.3 GB in the end (delta: -846.7 MB). There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 09:17:04,754 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 09:17:04,754 INFO L168 Benchmark]: CACSL2BoogieTranslator took 269.03 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-27 09:17:04,755 INFO L168 Benchmark]: Boogie Procedure Inliner took 21.96 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 09:17:04,755 INFO L168 Benchmark]: Boogie Preprocessor took 23.34 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 09:17:04,755 INFO L168 Benchmark]: RCFGBuilder took 449.55 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 737.7 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -789.9 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. [2018-10-27 09:17:04,756 INFO L168 Benchmark]: TraceAbstraction took 241137.33 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 94.4 MB). Free memory was 2.2 GB in the beginning and 2.3 GB in the end (delta: -67.4 MB). Peak memory consumption was 27.0 MB. Max. memory is 7.1 GB. [2018-10-27 09:17:04,760 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 269.03 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 21.96 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 23.34 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 449.55 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 737.7 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -789.9 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 241137.33 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 94.4 MB). Free memory was 2.2 GB in the beginning and 2.3 GB in the end (delta: -67.4 MB). Peak memory consumption was 27.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was constructing difference of abstraction (741states) and FLOYD_HOARE automaton (currently 39 states, 116 states before enhancement),while ReachableStatesComputation was computing reachable states (253 states constructedinput type IntersectNwa). - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. TIMEOUT Result, 241.0s OverallTime, 36 OverallIterations, 99 TraceHistogramMax, 64.9s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 515 SDtfs, 12994 SDslu, 14736 SDs, 0 SdLazy, 10144 SolverSat, 4181 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 21.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 12671 GetRequests, 9564 SyntacticMatches, 72 SemanticMatches, 3035 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15500 ImplicationChecksByTransitivity, 166.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=741occurred in iteration=35, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 35 MinimizatonAttempts, 4901 StatesRemovedByMinimization, 33 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.4s SsaConstructionTime, 2.3s SatisfiabilityAnalysisTime, 170.3s InterpolantComputationTime, 10931 NumberOfCodeBlocks, 9743 NumberOfCodeBlocksAsserted, 156 NumberOfCheckSat, 16268 ConstructedInterpolants, 0 QuantifiedInterpolants, 9423888 SizeOfPredicates, 78 NumberOfNonLiveVariables, 10115 ConjunctsInSsa, 1373 ConjunctsInUnsatCore, 102 InterpolantComputations, 3 PerfectInterpolantSequences, 92865/414984 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown