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-crafted/simple_array_index_value_true-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:33:23,946 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:33:23,948 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:33:23,960 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:33:23,960 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:33:23,961 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:33:23,962 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:33:23,964 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:33:23,966 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:33:23,967 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:33:23,967 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:33:23,968 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:33:23,969 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:33:23,970 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:33:23,971 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:33:23,971 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:33:23,972 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:33:23,974 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:33:23,976 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:33:23,978 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:33:23,979 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:33:23,980 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:33:23,983 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-24 12:33:23,996 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-24 12:33:24,017 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:33:24,017 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:33:24,018 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:33:24,019 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:33:24,019 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:33:24,019 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:33:24,019 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-24 12:33:24,019 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:33:24,019 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-24 12:33:24,020 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:33:24,020 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:33:24,020 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:33:24,020 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:33:24,020 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:33:24,024 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:33:24,024 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:33:24,025 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:33:24,025 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:33:24,025 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:33:24,025 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:33:24,025 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:33:24,026 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:33:24,027 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:33:24,027 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:33:24,027 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:33:24,028 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:33:24,028 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:33:24,028 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:33:24,028 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:33:24,028 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:33:24,029 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:33:24,029 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:33:24,029 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:33:24,029 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:33:24,030 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:33:24,030 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:33:24,081 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:33:24,099 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:33:24,102 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:33:24,104 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:33:24,104 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:33:24,105 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call1_true-termination.i [2018-10-24 12:33:24,166 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/07fda7acd/510ab62fe52340b7bbeb4efe43da1b62/FLAG512883fa4 [2018-10-24 12:33:24,610 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:33:24,611 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call1_true-termination.i [2018-10-24 12:33:24,617 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/07fda7acd/510ab62fe52340b7bbeb4efe43da1b62/FLAG512883fa4 [2018-10-24 12:33:24,632 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/07fda7acd/510ab62fe52340b7bbeb4efe43da1b62 [2018-10-24 12:33:24,643 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:33:24,644 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:33:24,645 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:33:24,646 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:33:24,649 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:33:24,650 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:33:24" (1/1) ... [2018-10-24 12:33:24,653 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@20bf5984 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:33:24, skipping insertion in model container [2018-10-24 12:33:24,653 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:33:24" (1/1) ... [2018-10-24 12:33:24,663 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:33:24,684 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:33:24,915 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:33:24,920 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:33:24,947 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:33:24,972 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:33:24,972 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:33:24 WrapperNode [2018-10-24 12:33:24,972 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:33:24,973 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:33:24,974 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:33:24,974 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:33:24,984 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:33:24" (1/1) ... [2018-10-24 12:33:24,995 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:33:24" (1/1) ... [2018-10-24 12:33:25,017 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:33:25,017 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:33:25,018 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:33:25,018 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:33:25,026 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:33:24" (1/1) ... [2018-10-24 12:33:25,026 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:33:24" (1/1) ... [2018-10-24 12:33:25,028 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:33:24" (1/1) ... [2018-10-24 12:33:25,028 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:33:24" (1/1) ... [2018-10-24 12:33:25,035 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:33:24" (1/1) ... [2018-10-24 12:33:25,042 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:33:24" (1/1) ... [2018-10-24 12:33:25,043 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:33:24" (1/1) ... [2018-10-24 12:33:25,045 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:33:25,046 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:33:25,046 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:33:25,046 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:33:25,047 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:33:24" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:33:25,167 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:33:25,167 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:33:25,168 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:33:25,168 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:33:25,168 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:33:25,168 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:33:25,168 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:33:25,168 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:33:25,542 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:33:25,543 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:33:25 BoogieIcfgContainer [2018-10-24 12:33:25,543 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:33:25,544 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:33:25,544 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:33:25,547 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:33:25,547 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:33:24" (1/3) ... [2018-10-24 12:33:25,548 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79bff692 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:33:25, skipping insertion in model container [2018-10-24 12:33:25,548 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:33:24" (2/3) ... [2018-10-24 12:33:25,549 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79bff692 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:33:25, skipping insertion in model container [2018-10-24 12:33:25,549 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:33:25" (3/3) ... [2018-10-24 12:33:25,551 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_array_index_value_true-unreach-call1_true-termination.i [2018-10-24 12:33:25,561 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:33:25,569 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:33:25,586 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:33:25,619 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:33:25,619 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:33:25,619 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:33:25,619 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:33:25,619 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:33:25,620 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:33:25,620 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:33:25,620 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:33:25,638 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2018-10-24 12:33:25,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 12:33:25,645 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:33:25,646 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:33:25,648 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:33:25,654 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:33:25,654 INFO L82 PathProgramCache]: Analyzing trace with hash 1504457121, now seen corresponding path program 1 times [2018-10-24 12:33:25,657 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:33:25,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:25,706 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:33:25,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:25,707 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:33:25,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:33:25,781 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:25,783 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:33:25,783 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:33:25,784 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:33:25,788 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:33:25,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:33:25,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:33:25,803 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 2 states. [2018-10-24 12:33:25,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:33:25,827 INFO L93 Difference]: Finished difference Result 49 states and 61 transitions. [2018-10-24 12:33:25,828 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:33:25,829 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-10-24 12:33:25,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:33:25,839 INFO L225 Difference]: With dead ends: 49 [2018-10-24 12:33:25,839 INFO L226 Difference]: Without dead ends: 24 [2018-10-24 12:33:25,843 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:33:25,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-24 12:33:25,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-24 12:33:25,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-24 12:33:25,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2018-10-24 12:33:25,880 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 15 [2018-10-24 12:33:25,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:33:25,881 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2018-10-24 12:33:25,881 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:33:25,881 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2018-10-24 12:33:25,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-24 12:33:25,882 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:33:25,882 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:33:25,883 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:33:25,883 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:33:25,883 INFO L82 PathProgramCache]: Analyzing trace with hash -194164888, now seen corresponding path program 1 times [2018-10-24 12:33:25,884 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:33:25,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:25,885 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:33:25,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:25,885 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:33:25,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:33:25,985 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:25,986 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:33:25,986 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:33:25,986 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:33:25,988 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:33:25,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:33:25,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:33:25,989 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand 3 states. [2018-10-24 12:33:26,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:33:26,153 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2018-10-24 12:33:26,153 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:33:26,154 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2018-10-24 12:33:26,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:33:26,155 INFO L225 Difference]: With dead ends: 48 [2018-10-24 12:33:26,155 INFO L226 Difference]: Without dead ends: 33 [2018-10-24 12:33:26,156 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:33:26,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-24 12:33:26,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 29. [2018-10-24 12:33:26,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-24 12:33:26,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2018-10-24 12:33:26,166 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 16 [2018-10-24 12:33:26,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:33:26,166 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2018-10-24 12:33:26,166 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:33:26,166 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2018-10-24 12:33:26,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-24 12:33:26,167 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:33:26,167 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:33:26,168 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:33:26,168 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:33:26,168 INFO L82 PathProgramCache]: Analyzing trace with hash 706658557, now seen corresponding path program 1 times [2018-10-24 12:33:26,169 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:33:26,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:26,170 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:33:26,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:26,170 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:33:26,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:33:26,289 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:26,290 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:26,290 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:33:26,291 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-10-24 12:33:26,293 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [29], [32], [46], [49], [51], [57], [58], [59], [61] [2018-10-24 12:33:26,329 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:33:26,329 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:33:26,819 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:33:26,820 INFO L272 AbstractInterpreter]: Visited 18 different actions 37 times. Merged at 8 different actions 13 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 29 variables. [2018-10-24 12:33:26,858 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:33:26,859 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:33:26,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:26,860 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:33:26,876 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:33:26,876 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:33:26,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:33:26,925 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:33:27,027 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 8 [2018-10-24 12:33:27,030 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-10-24 12:33:27,031 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:33:27,044 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:33:27,049 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:33:27,050 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:11, output treesize:7 [2018-10-24 12:33:27,118 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2018-10-24 12:33:27,133 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2018-10-24 12:33:27,133 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:33:27,159 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:33:27,163 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:33:27,164 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:15, output treesize:3 [2018-10-24 12:33:27,209 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:27,210 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:33:27,680 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 18 [2018-10-24 12:33:27,816 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 24 [2018-10-24 12:33:27,844 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2018-10-24 12:33:27,850 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:33:27,875 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:33:27,879 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 25 [2018-10-24 12:33:27,944 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2018-10-24 12:33:27,945 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-24 12:33:27,951 INFO L267 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:33:27,977 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:33:27,977 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 6 variables, input treesize:88, output treesize:7 [2018-10-24 12:33:27,999 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:28,020 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:33:28,020 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 8, 8] total 15 [2018-10-24 12:33:28,020 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:33:28,021 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:33:28,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:33:28,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:33:28,022 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 9 states. [2018-10-24 12:33:32,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:33:32,608 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2018-10-24 12:33:32,609 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:33:32,609 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2018-10-24 12:33:32,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:33:32,611 INFO L225 Difference]: With dead ends: 87 [2018-10-24 12:33:32,611 INFO L226 Difference]: Without dead ends: 69 [2018-10-24 12:33:32,612 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:33:32,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-24 12:33:32,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 50. [2018-10-24 12:33:32,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-24 12:33:32,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2018-10-24 12:33:32,624 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 19 [2018-10-24 12:33:32,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:33:32,625 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2018-10-24 12:33:32,625 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:33:32,625 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2018-10-24 12:33:32,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 12:33:32,626 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:33:32,626 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:33:32,627 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:33:32,627 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:33:32,627 INFO L82 PathProgramCache]: Analyzing trace with hash -1962567395, now seen corresponding path program 2 times [2018-10-24 12:33:32,627 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:33:32,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:32,628 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:33:32,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:32,629 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:33:32,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:33:32,823 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:32,823 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:32,824 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:33:32,824 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:33:32,824 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:33:32,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:32,825 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 [2018-10-24 12:33:32,842 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:33:32,842 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:33:32,906 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:33:32,906 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:33:32,908 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:33:32,935 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:32,936 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:33:33,064 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:33,085 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:33:33,085 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-24 12:33:33,085 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:33:33,086 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:33:33,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:33:33,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:33:33,086 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand 6 states. [2018-10-24 12:33:33,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:33:33,340 INFO L93 Difference]: Finished difference Result 93 states and 107 transitions. [2018-10-24 12:33:33,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:33:33,343 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2018-10-24 12:33:33,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:33:33,344 INFO L225 Difference]: With dead ends: 93 [2018-10-24 12:33:33,345 INFO L226 Difference]: Without dead ends: 60 [2018-10-24 12:33:33,345 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:33:33,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-24 12:33:33,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2018-10-24 12:33:33,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-24 12:33:33,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 62 transitions. [2018-10-24 12:33:33,357 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 62 transitions. Word has length 25 [2018-10-24 12:33:33,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:33:33,358 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 62 transitions. [2018-10-24 12:33:33,358 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:33:33,358 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 62 transitions. [2018-10-24 12:33:33,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-24 12:33:33,359 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:33:33,359 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:33:33,359 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:33:33,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:33:33,360 INFO L82 PathProgramCache]: Analyzing trace with hash 296425256, now seen corresponding path program 3 times [2018-10-24 12:33:33,360 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:33:33,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:33,361 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:33:33,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:33,361 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:33:33,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:33:33,561 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:33,562 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:33,562 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:33:33,562 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:33:33,562 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:33:33,562 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:33,562 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:33:33,574 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:33:33,574 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:33:33,625 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:33:33,625 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:33:33,628 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:33:33,658 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:33,658 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:33:34,015 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:34,035 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:33:34,036 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-24 12:33:34,036 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:33:34,036 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:33:34,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:33:34,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:33:34,038 INFO L87 Difference]: Start difference. First operand 56 states and 62 transitions. Second operand 7 states. [2018-10-24 12:33:34,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:33:34,324 INFO L93 Difference]: Finished difference Result 105 states and 120 transitions. [2018-10-24 12:33:34,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:33:34,325 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2018-10-24 12:33:34,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:33:34,326 INFO L225 Difference]: With dead ends: 105 [2018-10-24 12:33:34,326 INFO L226 Difference]: Without dead ends: 69 [2018-10-24 12:33:34,327 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:33:34,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-24 12:33:34,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 65. [2018-10-24 12:33:34,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-24 12:33:34,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 72 transitions. [2018-10-24 12:33:34,338 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 72 transitions. Word has length 28 [2018-10-24 12:33:34,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:33:34,338 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 72 transitions. [2018-10-24 12:33:34,338 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:33:34,339 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 72 transitions. [2018-10-24 12:33:34,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-24 12:33:34,340 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:33:34,340 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:33:34,340 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:33:34,340 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:33:34,341 INFO L82 PathProgramCache]: Analyzing trace with hash 103930173, now seen corresponding path program 4 times [2018-10-24 12:33:34,341 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:33:34,342 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:34,342 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:33:34,342 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:34,342 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:33:34,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:33:34,654 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:34,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:34,655 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:33:34,655 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:33:34,656 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:33:34,656 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:34,656 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:33:34,671 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:33:34,671 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:33:34,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:33:34,702 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:33:34,718 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:34,719 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:33:35,493 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:35,515 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:33:35,515 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-24 12:33:35,516 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:33:35,516 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:33:35,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:33:35,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:33:35,517 INFO L87 Difference]: Start difference. First operand 65 states and 72 transitions. Second operand 8 states. [2018-10-24 12:33:35,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:33:35,934 INFO L93 Difference]: Finished difference Result 120 states and 137 transitions. [2018-10-24 12:33:35,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:33:35,935 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-10-24 12:33:35,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:33:35,936 INFO L225 Difference]: With dead ends: 120 [2018-10-24 12:33:35,936 INFO L226 Difference]: Without dead ends: 78 [2018-10-24 12:33:35,937 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:33:35,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-24 12:33:35,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 74. [2018-10-24 12:33:35,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-24 12:33:35,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 82 transitions. [2018-10-24 12:33:35,948 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 82 transitions. Word has length 31 [2018-10-24 12:33:35,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:33:35,949 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 82 transitions. [2018-10-24 12:33:35,949 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:33:35,949 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 82 transitions. [2018-10-24 12:33:35,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-24 12:33:35,950 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:33:35,950 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:33:35,951 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:33:35,951 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:33:35,951 INFO L82 PathProgramCache]: Analyzing trace with hash -735747320, now seen corresponding path program 5 times [2018-10-24 12:33:35,951 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:33:35,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:35,952 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:33:35,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:35,952 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:33:35,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:33:36,200 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:36,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:36,201 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:33:36,201 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:33:36,201 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:33:36,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:36,202 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:33:36,210 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:33:36,210 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:33:36,519 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-24 12:33:36,519 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:33:36,525 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:33:36,543 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:36,543 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:33:37,186 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:37,207 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:33:37,208 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-24 12:33:37,208 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:33:37,208 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:33:37,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:33:37,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:33:37,209 INFO L87 Difference]: Start difference. First operand 74 states and 82 transitions. Second operand 9 states. [2018-10-24 12:33:37,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:33:37,615 INFO L93 Difference]: Finished difference Result 135 states and 154 transitions. [2018-10-24 12:33:37,616 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:33:37,616 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 34 [2018-10-24 12:33:37,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:33:37,618 INFO L225 Difference]: With dead ends: 135 [2018-10-24 12:33:37,618 INFO L226 Difference]: Without dead ends: 87 [2018-10-24 12:33:37,619 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:33:37,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-24 12:33:37,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 83. [2018-10-24 12:33:37,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-10-24 12:33:37,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 92 transitions. [2018-10-24 12:33:37,629 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 92 transitions. Word has length 34 [2018-10-24 12:33:37,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:33:37,630 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 92 transitions. [2018-10-24 12:33:37,630 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:33:37,630 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 92 transitions. [2018-10-24 12:33:37,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-24 12:33:37,631 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:33:37,631 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:33:37,631 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:33:37,632 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:33:37,632 INFO L82 PathProgramCache]: Analyzing trace with hash -1678409379, now seen corresponding path program 6 times [2018-10-24 12:33:37,632 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:33:37,633 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:37,633 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:33:37,633 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:37,633 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:33:37,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:33:37,861 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:37,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:37,862 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:33:37,862 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:33:37,862 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:33:37,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:37,863 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:33:37,871 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:33:37,871 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:33:37,918 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:33:37,918 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:33:37,923 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:33:37,961 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:37,961 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:33:43,796 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 71 refuted. 6 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:43,817 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:33:43,817 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-24 12:33:43,817 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:33:43,818 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:33:43,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:33:43,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=207, Unknown=2, NotChecked=0, Total=306 [2018-10-24 12:33:43,818 INFO L87 Difference]: Start difference. First operand 83 states and 92 transitions. Second operand 10 states. [2018-10-24 12:33:44,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:33:44,295 INFO L93 Difference]: Finished difference Result 150 states and 171 transitions. [2018-10-24 12:33:44,298 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:33:44,298 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 37 [2018-10-24 12:33:44,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:33:44,300 INFO L225 Difference]: With dead ends: 150 [2018-10-24 12:33:44,300 INFO L226 Difference]: Without dead ends: 96 [2018-10-24 12:33:44,301 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=97, Invalid=207, Unknown=2, NotChecked=0, Total=306 [2018-10-24 12:33:44,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-24 12:33:44,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 92. [2018-10-24 12:33:44,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-10-24 12:33:44,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 102 transitions. [2018-10-24 12:33:44,312 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 102 transitions. Word has length 37 [2018-10-24 12:33:44,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:33:44,313 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 102 transitions. [2018-10-24 12:33:44,313 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:33:44,313 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 102 transitions. [2018-10-24 12:33:44,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-24 12:33:44,314 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:33:44,314 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:33:44,315 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:33:44,315 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:33:44,315 INFO L82 PathProgramCache]: Analyzing trace with hash 267339496, now seen corresponding path program 7 times [2018-10-24 12:33:44,315 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:33:44,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:44,316 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:33:44,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:44,316 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:33:44,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:33:44,794 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:44,794 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:44,794 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:33:44,794 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:33:44,794 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:33:44,795 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:44,795 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:33:44,803 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:33:44,804 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:33:44,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:33:44,843 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:33:44,882 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:44,882 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:33:48,578 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:48,599 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:33:48,600 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-24 12:33:48,600 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:33:48,600 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:33:48,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:33:48,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:33:48,601 INFO L87 Difference]: Start difference. First operand 92 states and 102 transitions. Second operand 11 states. [2018-10-24 12:33:49,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:33:49,358 INFO L93 Difference]: Finished difference Result 165 states and 188 transitions. [2018-10-24 12:33:49,359 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:33:49,359 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 40 [2018-10-24 12:33:49,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:33:49,360 INFO L225 Difference]: With dead ends: 165 [2018-10-24 12:33:49,360 INFO L226 Difference]: Without dead ends: 105 [2018-10-24 12:33:49,361 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:33:49,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-24 12:33:49,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 101. [2018-10-24 12:33:49,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-10-24 12:33:49,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 112 transitions. [2018-10-24 12:33:49,372 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 112 transitions. Word has length 40 [2018-10-24 12:33:49,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:33:49,372 INFO L481 AbstractCegarLoop]: Abstraction has 101 states and 112 transitions. [2018-10-24 12:33:49,372 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:33:49,372 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 112 transitions. [2018-10-24 12:33:49,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-24 12:33:49,373 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:33:49,374 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:33:49,374 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:33:49,374 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:33:49,374 INFO L82 PathProgramCache]: Analyzing trace with hash 1193447805, now seen corresponding path program 8 times [2018-10-24 12:33:49,374 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:33:49,375 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:49,375 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:33:49,375 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:49,376 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:33:49,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:33:50,090 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:50,090 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:50,090 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:33:50,091 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:33:50,091 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:33:50,091 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:50,091 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:33:50,101 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:33:50,101 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:33:50,763 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 12:33:50,763 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:33:50,768 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:33:50,809 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:50,809 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:33:53,120 WARN L854 $PredicateComparison]: unable to prove that (or (< (mod (+ c_main_~index~0 3) 4294967296) 1000) (<= 1000 (mod (+ c_main_~index~0 2) 4294967296))) is different from true [2018-10-24 12:33:54,982 WARN L179 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:33:55,820 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 26 not checked. [2018-10-24 12:33:55,841 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:33:55,841 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 13] total 23 [2018-10-24 12:33:55,841 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:33:55,841 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:33:55,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:33:55,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=321, Unknown=1, NotChecked=40, Total=506 [2018-10-24 12:33:55,842 INFO L87 Difference]: Start difference. First operand 101 states and 112 transitions. Second operand 12 states. [2018-10-24 12:33:56,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:33:56,421 INFO L93 Difference]: Finished difference Result 180 states and 205 transitions. [2018-10-24 12:33:56,422 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:33:56,422 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 43 [2018-10-24 12:33:56,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:33:56,424 INFO L225 Difference]: With dead ends: 180 [2018-10-24 12:33:56,424 INFO L226 Difference]: Without dead ends: 114 [2018-10-24 12:33:56,425 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 73 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=144, Invalid=321, Unknown=1, NotChecked=40, Total=506 [2018-10-24 12:33:56,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-24 12:33:56,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 110. [2018-10-24 12:33:56,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-10-24 12:33:56,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 122 transitions. [2018-10-24 12:33:56,437 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 122 transitions. Word has length 43 [2018-10-24 12:33:56,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:33:56,437 INFO L481 AbstractCegarLoop]: Abstraction has 110 states and 122 transitions. [2018-10-24 12:33:56,437 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:33:56,438 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 122 transitions. [2018-10-24 12:33:56,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-24 12:33:56,439 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:33:56,439 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:33:56,439 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:33:56,440 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:33:56,440 INFO L82 PathProgramCache]: Analyzing trace with hash 16171720, now seen corresponding path program 9 times [2018-10-24 12:33:56,440 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:33:56,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:56,441 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:33:56,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:56,441 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:33:56,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:33:56,859 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:56,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:56,859 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:33:56,859 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:33:56,859 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:33:56,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:56,860 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:33:56,870 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:33:56,870 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:33:56,906 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:33:56,906 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:33:56,909 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:33:56,965 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:56,965 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:02,134 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:02,155 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:02,155 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-24 12:34:02,155 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:02,156 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:34:02,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:34:02,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=385, Unknown=1, NotChecked=0, Total=552 [2018-10-24 12:34:02,157 INFO L87 Difference]: Start difference. First operand 110 states and 122 transitions. Second operand 13 states. [2018-10-24 12:34:03,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:03,214 INFO L93 Difference]: Finished difference Result 195 states and 222 transitions. [2018-10-24 12:34:03,214 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:34:03,215 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 46 [2018-10-24 12:34:03,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:03,217 INFO L225 Difference]: With dead ends: 195 [2018-10-24 12:34:03,217 INFO L226 Difference]: Without dead ends: 123 [2018-10-24 12:34:03,218 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=166, Invalid=385, Unknown=1, NotChecked=0, Total=552 [2018-10-24 12:34:03,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-24 12:34:03,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 119. [2018-10-24 12:34:03,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-10-24 12:34:03,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 132 transitions. [2018-10-24 12:34:03,227 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 132 transitions. Word has length 46 [2018-10-24 12:34:03,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:03,228 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 132 transitions. [2018-10-24 12:34:03,228 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:34:03,228 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 132 transitions. [2018-10-24 12:34:03,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 12:34:03,229 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:03,229 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:03,229 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:03,230 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:03,230 INFO L82 PathProgramCache]: Analyzing trace with hash 487262621, now seen corresponding path program 10 times [2018-10-24 12:34:03,230 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:03,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:03,231 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:03,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:03,231 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:03,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:03,922 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:03,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:03,923 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:03,923 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:03,923 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:03,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:03,923 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:03,932 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:03,932 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:03,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:03,970 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:04,009 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:04,009 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:15,538 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 184 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:15,559 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:15,560 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-24 12:34:15,560 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:15,560 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:34:15,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:34:15,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=456, Unknown=1, NotChecked=0, Total=650 [2018-10-24 12:34:15,561 INFO L87 Difference]: Start difference. First operand 119 states and 132 transitions. Second operand 14 states. [2018-10-24 12:34:16,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:16,233 INFO L93 Difference]: Finished difference Result 210 states and 239 transitions. [2018-10-24 12:34:16,236 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:34:16,236 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 49 [2018-10-24 12:34:16,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:16,237 INFO L225 Difference]: With dead ends: 210 [2018-10-24 12:34:16,237 INFO L226 Difference]: Without dead ends: 132 [2018-10-24 12:34:16,238 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 85 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=193, Invalid=456, Unknown=1, NotChecked=0, Total=650 [2018-10-24 12:34:16,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-24 12:34:16,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 128. [2018-10-24 12:34:16,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:34:16,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 142 transitions. [2018-10-24 12:34:16,246 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 142 transitions. Word has length 49 [2018-10-24 12:34:16,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:16,247 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 142 transitions. [2018-10-24 12:34:16,247 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:34:16,247 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 142 transitions. [2018-10-24 12:34:16,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-24 12:34:16,249 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:16,249 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:16,249 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:16,249 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:16,250 INFO L82 PathProgramCache]: Analyzing trace with hash -1196829016, now seen corresponding path program 11 times [2018-10-24 12:34:16,250 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:16,250 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:16,251 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:16,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:16,253 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:16,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:16,939 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:16,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:16,940 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:16,940 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:16,940 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:16,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:16,940 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:16,948 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:16,948 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:22,267 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-10-24 12:34:22,267 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:22,275 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:22,303 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:22,303 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:30,863 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:30,884 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:30,884 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-24 12:34:30,885 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:30,885 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:34:30,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:34:30,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:34:30,887 INFO L87 Difference]: Start difference. First operand 128 states and 142 transitions. Second operand 15 states. [2018-10-24 12:34:32,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:32,071 INFO L93 Difference]: Finished difference Result 225 states and 256 transitions. [2018-10-24 12:34:32,071 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:34:32,071 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 52 [2018-10-24 12:34:32,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:32,073 INFO L225 Difference]: With dead ends: 225 [2018-10-24 12:34:32,073 INFO L226 Difference]: Without dead ends: 141 [2018-10-24 12:34:32,075 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:34:32,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2018-10-24 12:34:32,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 137. [2018-10-24 12:34:32,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2018-10-24 12:34:32,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 152 transitions. [2018-10-24 12:34:32,083 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 152 transitions. Word has length 52 [2018-10-24 12:34:32,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:32,083 INFO L481 AbstractCegarLoop]: Abstraction has 137 states and 152 transitions. [2018-10-24 12:34:32,084 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:34:32,084 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 152 transitions. [2018-10-24 12:34:32,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-24 12:34:32,085 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:32,085 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:32,085 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:32,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:32,086 INFO L82 PathProgramCache]: Analyzing trace with hash 1837164989, now seen corresponding path program 12 times [2018-10-24 12:34:32,086 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:32,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:32,087 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:32,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:32,087 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:32,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:32,375 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:32,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:32,375 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:32,375 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:32,375 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:32,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:32,376 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:32,383 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:32,383 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:32,423 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:32,424 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:32,426 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:32,441 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:32,441 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:43,271 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:43,290 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:43,291 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-24 12:34:43,291 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:43,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:34:43,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:34:43,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=616, Unknown=1, NotChecked=0, Total=870 [2018-10-24 12:34:43,292 INFO L87 Difference]: Start difference. First operand 137 states and 152 transitions. Second operand 16 states. [2018-10-24 12:34:44,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:44,151 INFO L93 Difference]: Finished difference Result 240 states and 273 transitions. [2018-10-24 12:34:44,153 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:34:44,153 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 55 [2018-10-24 12:34:44,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:44,154 INFO L225 Difference]: With dead ends: 240 [2018-10-24 12:34:44,154 INFO L226 Difference]: Without dead ends: 150 [2018-10-24 12:34:44,155 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 95 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=253, Invalid=616, Unknown=1, NotChecked=0, Total=870 [2018-10-24 12:34:44,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-10-24 12:34:44,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 146. [2018-10-24 12:34:44,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2018-10-24 12:34:44,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 162 transitions. [2018-10-24 12:34:44,163 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 162 transitions. Word has length 55 [2018-10-24 12:34:44,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:44,164 INFO L481 AbstractCegarLoop]: Abstraction has 146 states and 162 transitions. [2018-10-24 12:34:44,164 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:34:44,164 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 162 transitions. [2018-10-24 12:34:44,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-24 12:34:44,165 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:44,165 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:44,165 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:44,165 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:44,166 INFO L82 PathProgramCache]: Analyzing trace with hash -34176376, now seen corresponding path program 13 times [2018-10-24 12:34:44,166 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:44,166 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:44,167 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:44,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:44,167 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:44,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:44,448 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:44,448 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:44,448 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:44,448 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:44,448 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:44,449 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:44,449 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:44,456 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:44,456 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:44,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:44,505 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:44,547 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:44,547 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:57,353 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 298 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:57,373 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:57,373 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-24 12:34:57,373 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:57,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:34:57,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:34:57,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=704, Unknown=2, NotChecked=0, Total=992 [2018-10-24 12:34:57,375 INFO L87 Difference]: Start difference. First operand 146 states and 162 transitions. Second operand 17 states. [2018-10-24 12:34:58,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:58,741 INFO L93 Difference]: Finished difference Result 255 states and 290 transitions. [2018-10-24 12:34:58,745 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:34:58,745 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 58 [2018-10-24 12:34:58,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:58,746 INFO L225 Difference]: With dead ends: 255 [2018-10-24 12:34:58,747 INFO L226 Difference]: Without dead ends: 159 [2018-10-24 12:34:58,748 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 100 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=286, Invalid=704, Unknown=2, NotChecked=0, Total=992 [2018-10-24 12:34:58,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2018-10-24 12:34:58,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 155. [2018-10-24 12:34:58,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2018-10-24 12:34:58,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 172 transitions. [2018-10-24 12:34:58,756 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 172 transitions. Word has length 58 [2018-10-24 12:34:58,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:58,756 INFO L481 AbstractCegarLoop]: Abstraction has 155 states and 172 transitions. [2018-10-24 12:34:58,756 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:34:58,757 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 172 transitions. [2018-10-24 12:34:58,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-24 12:34:58,757 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:58,758 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:58,758 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:58,758 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:58,758 INFO L82 PathProgramCache]: Analyzing trace with hash -489279011, now seen corresponding path program 14 times [2018-10-24 12:34:58,758 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:58,759 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:58,759 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:58,759 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:58,759 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:58,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:59,057 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:59,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:59,058 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:59,058 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:59,058 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:59,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:59,058 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:59,065 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:59,065 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:13,086 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-24 12:35:13,086 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:13,097 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:13,146 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:13,146 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:19,175 WARN L179 SmtUtils]: Spent 1.03 s on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:35:19,397 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:35:20,184 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:20,205 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:20,205 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 19] total 35 [2018-10-24 12:35:20,206 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:20,206 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:35:20,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:35:20,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:35:20,207 INFO L87 Difference]: Start difference. First operand 155 states and 172 transitions. Second operand 18 states. [2018-10-24 12:35:21,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:21,567 INFO L93 Difference]: Finished difference Result 270 states and 307 transitions. [2018-10-24 12:35:21,567 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:35:21,567 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 61 [2018-10-24 12:35:21,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:21,569 INFO L225 Difference]: With dead ends: 270 [2018-10-24 12:35:21,569 INFO L226 Difference]: Without dead ends: 168 [2018-10-24 12:35:21,571 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 103 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:35:21,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2018-10-24 12:35:21,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 164. [2018-10-24 12:35:21,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2018-10-24 12:35:21,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 182 transitions. [2018-10-24 12:35:21,579 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 182 transitions. Word has length 61 [2018-10-24 12:35:21,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:21,579 INFO L481 AbstractCegarLoop]: Abstraction has 164 states and 182 transitions. [2018-10-24 12:35:21,579 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:35:21,579 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 182 transitions. [2018-10-24 12:35:21,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-24 12:35:21,580 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:21,580 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:21,581 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:21,581 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:21,581 INFO L82 PathProgramCache]: Analyzing trace with hash 759875176, now seen corresponding path program 15 times [2018-10-24 12:35:21,581 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:21,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:21,582 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:21,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:21,582 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:21,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:21,981 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:21,981 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:21,982 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:21,982 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:21,982 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:21,982 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:21,982 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:21,993 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:21,994 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:22,041 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:22,041 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:22,044 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:22,084 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:22,084 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:36,591 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:36,612 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:36,613 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-24 12:35:36,613 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:36,613 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:35:36,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:35:36,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=901, Unknown=1, NotChecked=0, Total=1260 [2018-10-24 12:35:36,614 INFO L87 Difference]: Start difference. First operand 164 states and 182 transitions. Second operand 19 states. [2018-10-24 12:35:37,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:37,937 INFO L93 Difference]: Finished difference Result 285 states and 324 transitions. [2018-10-24 12:35:37,938 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:35:37,938 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 64 [2018-10-24 12:35:37,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:37,940 INFO L225 Difference]: With dead ends: 285 [2018-10-24 12:35:37,940 INFO L226 Difference]: Without dead ends: 177 [2018-10-24 12:35:37,941 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 110 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=358, Invalid=901, Unknown=1, NotChecked=0, Total=1260 [2018-10-24 12:35:37,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-10-24 12:35:37,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 173. [2018-10-24 12:35:37,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2018-10-24 12:35:37,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 192 transitions. [2018-10-24 12:35:37,951 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 192 transitions. Word has length 64 [2018-10-24 12:35:37,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:37,951 INFO L481 AbstractCegarLoop]: Abstraction has 173 states and 192 transitions. [2018-10-24 12:35:37,951 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:35:37,951 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 192 transitions. [2018-10-24 12:35:37,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-24 12:35:37,952 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:37,952 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:37,952 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:37,953 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:37,953 INFO L82 PathProgramCache]: Analyzing trace with hash -1579359747, now seen corresponding path program 16 times [2018-10-24 12:35:37,953 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:37,953 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:37,954 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:37,954 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:37,954 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:37,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:38,344 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:38,344 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:38,344 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:38,344 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:38,345 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:38,345 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:38,345 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:38,353 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:38,353 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:38,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:38,408 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:38,450 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:38,450 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:06,348 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 439 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:36:06,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:06,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-24 12:36:06,372 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:06,372 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:36:06,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:36:06,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1006, Unknown=3, NotChecked=0, Total=1406 [2018-10-24 12:36:06,373 INFO L87 Difference]: Start difference. First operand 173 states and 192 transitions. Second operand 20 states. [2018-10-24 12:36:07,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:07,927 INFO L93 Difference]: Finished difference Result 300 states and 341 transitions. [2018-10-24 12:36:07,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:36:07,928 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2018-10-24 12:36:07,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:07,930 INFO L225 Difference]: With dead ends: 300 [2018-10-24 12:36:07,930 INFO L226 Difference]: Without dead ends: 186 [2018-10-24 12:36:07,932 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 115 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 28.2s TimeCoverageRelationStatistics Valid=397, Invalid=1006, Unknown=3, NotChecked=0, Total=1406 [2018-10-24 12:36:07,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-10-24 12:36:07,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 182. [2018-10-24 12:36:07,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2018-10-24 12:36:07,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 202 transitions. [2018-10-24 12:36:07,940 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 202 transitions. Word has length 67 [2018-10-24 12:36:07,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:07,940 INFO L481 AbstractCegarLoop]: Abstraction has 182 states and 202 transitions. [2018-10-24 12:36:07,941 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:36:07,941 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 202 transitions. [2018-10-24 12:36:07,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-10-24 12:36:07,941 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:07,942 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:07,942 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:07,942 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:07,942 INFO L82 PathProgramCache]: Analyzing trace with hash 412394056, now seen corresponding path program 17 times [2018-10-24 12:36:07,942 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:07,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:07,943 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:07,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:07,943 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:07,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:08,634 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:36:08,634 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:08,634 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:08,635 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:08,635 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:08,635 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:08,635 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:08,658 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:08,658 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:50,459 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-10-24 12:36:50,459 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:50,478 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:50,532 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:36:50,532 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:51,484 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:36:52,415 WARN L179 SmtUtils]: Spent 340.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:37:00,186 WARN L179 SmtUtils]: Spent 422.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:37:01,102 WARN L179 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:37:01,761 WARN L179 SmtUtils]: Spent 223.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:37:02,117 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:37:02,140 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 490 refuted. 5 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:02,163 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:02,163 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 22] total 41 [2018-10-24 12:37:02,163 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:02,164 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:37:02,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:37:02,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=460, Invalid=1178, Unknown=2, NotChecked=0, Total=1640 [2018-10-24 12:37:02,165 INFO L87 Difference]: Start difference. First operand 182 states and 202 transitions. Second operand 21 states. [2018-10-24 12:37:03,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:03,858 INFO L93 Difference]: Finished difference Result 315 states and 358 transitions. [2018-10-24 12:37:03,858 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:37:03,858 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 70 [2018-10-24 12:37:03,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:03,860 INFO L225 Difference]: With dead ends: 315 [2018-10-24 12:37:03,860 INFO L226 Difference]: Without dead ends: 195 [2018-10-24 12:37:03,862 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 118 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=460, Invalid=1178, Unknown=2, NotChecked=0, Total=1640 [2018-10-24 12:37:03,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2018-10-24 12:37:03,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 191. [2018-10-24 12:37:03,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 191 states. [2018-10-24 12:37:03,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 212 transitions. [2018-10-24 12:37:03,871 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 212 transitions. Word has length 70 [2018-10-24 12:37:03,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:03,871 INFO L481 AbstractCegarLoop]: Abstraction has 191 states and 212 transitions. [2018-10-24 12:37:03,871 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:37:03,872 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 212 transitions. [2018-10-24 12:37:03,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-24 12:37:03,872 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:03,872 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:03,873 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:03,873 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:03,873 INFO L82 PathProgramCache]: Analyzing trace with hash 1776744989, now seen corresponding path program 18 times [2018-10-24 12:37:03,873 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:03,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:03,874 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:03,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:03,874 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:03,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:05,196 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:05,197 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:05,197 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:05,197 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:05,197 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:05,197 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:05,197 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:05,205 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:37:05,206 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:37:05,261 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:37:05,261 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:05,264 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:05,303 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:05,303 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:28,329 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 542 refuted. 9 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:28,349 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:28,350 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-24 12:37:28,350 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:28,350 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:37:28,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:37:28,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1236, Unknown=5, NotChecked=0, Total=1722 [2018-10-24 12:37:28,351 INFO L87 Difference]: Start difference. First operand 191 states and 212 transitions. Second operand 22 states. [2018-10-24 12:37:31,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:31,370 INFO L93 Difference]: Finished difference Result 330 states and 375 transitions. [2018-10-24 12:37:31,370 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:37:31,370 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 73 [2018-10-24 12:37:31,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:31,372 INFO L225 Difference]: With dead ends: 330 [2018-10-24 12:37:31,372 INFO L226 Difference]: Without dead ends: 204 [2018-10-24 12:37:31,374 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 125 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 24.2s TimeCoverageRelationStatistics Valid=481, Invalid=1236, Unknown=5, NotChecked=0, Total=1722 [2018-10-24 12:37:31,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2018-10-24 12:37:31,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 200. [2018-10-24 12:37:31,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2018-10-24 12:37:31,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 222 transitions. [2018-10-24 12:37:31,383 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 222 transitions. Word has length 73 [2018-10-24 12:37:31,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:31,383 INFO L481 AbstractCegarLoop]: Abstraction has 200 states and 222 transitions. [2018-10-24 12:37:31,383 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:37:31,383 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 222 transitions. [2018-10-24 12:37:31,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-24 12:37:31,384 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:31,384 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:31,385 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:31,385 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:31,385 INFO L82 PathProgramCache]: Analyzing trace with hash -415099352, now seen corresponding path program 19 times [2018-10-24 12:37:31,385 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:31,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:31,386 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:31,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:31,386 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:31,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:31,978 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:31,978 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:31,978 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:31,978 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:31,978 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:31,979 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:31,979 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:31,986 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:31,986 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:32,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:32,051 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:32,122 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:32,122 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-10-24 12:38:01,237 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-24 12:38:01,438 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:01,439 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:38:01,444 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:38:01,444 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:38:01 BoogieIcfgContainer [2018-10-24 12:38:01,444 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:38:01,445 INFO L168 Benchmark]: Toolchain (without parser) took 276801.69 ms. Allocated memory was 1.5 GB in the beginning and 2.5 GB in the end (delta: 932.7 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -748.4 MB). Peak memory consumption was 184.3 MB. Max. memory is 7.1 GB. [2018-10-24 12:38:01,446 INFO L168 Benchmark]: CDTParser took 0.20 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. [2018-10-24 12:38:01,446 INFO L168 Benchmark]: CACSL2BoogieTranslator took 327.60 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. [2018-10-24 12:38:01,447 INFO L168 Benchmark]: Boogie Procedure Inliner took 43.70 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. [2018-10-24 12:38:01,447 INFO L168 Benchmark]: Boogie Preprocessor took 27.75 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. [2018-10-24 12:38:01,448 INFO L168 Benchmark]: RCFGBuilder took 497.40 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 759.7 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -793.9 MB). Peak memory consumption was 15.1 MB. Max. memory is 7.1 GB. [2018-10-24 12:38:01,448 INFO L168 Benchmark]: TraceAbstraction took 275900.63 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 173.0 MB). Free memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: 34.9 MB). Peak memory consumption was 207.9 MB. Max. memory is 7.1 GB. [2018-10-24 12:38:01,452 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 327.60 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 43.70 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 27.75 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 497.40 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 759.7 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -793.9 MB). Peak memory consumption was 15.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 275900.63 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 173.0 MB). Free memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: 34.9 MB). Peak memory consumption was 207.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 11]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 11). Cancelled while BasicCegarLoop was analyzing trace of length 77 with TraceHistMax 21,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 41 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 29 locations, 1 error locations. TIMEOUT Result, 275.8s OverallTime, 21 OverallIterations, 21 TraceHistogramMax, 22.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 1356 SDtfs, 873 SDslu, 13427 SDs, 0 SdLazy, 17673 SolverSat, 240 SolverUnsat, 2 SolverUnknown, 0 SolverNotchecked, 19.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1936 GetRequests, 1470 SyntacticMatches, 38 SemanticMatches, 428 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 156.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=200occurred in iteration=20, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.5s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 20 MinimizatonAttempts, 91 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 62.9s SatisfiabilityAnalysisTime, 158.7s InterpolantComputationTime, 1735 NumberOfCodeBlocks, 1735 NumberOfCodeBlocksAsserted, 107 NumberOfCheckSat, 2531 ConstructedInterpolants, 0 QuantifiedInterpolants, 749257 SizeOfPredicates, 40 NumberOfNonLiveVariables, 3910 ConjunctsInSsa, 470 ConjunctsInUnsatCore, 56 InterpolantComputations, 2 PerfectInterpolantSequences, 0/11379 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown