java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loops/linear_sea.ch_true-unreach-call.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 15:56:07,911 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 15:56:07,913 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 15:56:07,926 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 15:56:07,926 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 15:56:07,927 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 15:56:07,928 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 15:56:07,930 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 15:56:07,932 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 15:56:07,933 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 15:56:07,933 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 15:56:07,934 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 15:56:07,935 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 15:56:07,936 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 15:56:07,937 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 15:56:07,938 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 15:56:07,939 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 15:56:07,941 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 15:56:07,943 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 15:56:07,944 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 15:56:07,945 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 15:56:07,947 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 15:56:07,949 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-22 15:56:07,958 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-22 15:56:07,973 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 15:56:07,973 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 15:56:07,974 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 15:56:07,974 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 15:56:07,975 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 15:56:07,975 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 15:56:07,975 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 15:56:07,975 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 15:56:07,975 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 15:56:07,976 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 15:56:07,976 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 15:56:07,976 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 15:56:07,977 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 15:56:07,977 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 15:56:07,977 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 15:56:07,977 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 15:56:07,978 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 15:56:07,978 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 15:56:07,978 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 15:56:07,978 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 15:56:07,978 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 15:56:07,978 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 15:56:07,979 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 15:56:07,979 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 15:56:07,979 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 15:56:07,979 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 15:56:07,979 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 15:56:07,980 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 15:56:07,980 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 15:56:07,980 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 15:56:07,980 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 15:56:07,980 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 15:56:07,981 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 15:56:07,981 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 15:56:08,042 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 15:56:08,057 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 15:56:08,060 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 15:56:08,062 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 15:56:08,062 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 15:56:08,063 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/linear_sea.ch_true-unreach-call.i [2018-10-22 15:56:08,130 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/b8d0a2f8a/908b49989f86464a8e1a8fdf08b2fa63/FLAG6e85b256c [2018-10-22 15:56:08,569 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 15:56:08,570 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/linear_sea.ch_true-unreach-call.i [2018-10-22 15:56:08,577 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/b8d0a2f8a/908b49989f86464a8e1a8fdf08b2fa63/FLAG6e85b256c [2018-10-22 15:56:08,592 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/b8d0a2f8a/908b49989f86464a8e1a8fdf08b2fa63 [2018-10-22 15:56:08,602 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 15:56:08,604 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 15:56:08,605 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 15:56:08,605 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 15:56:08,609 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 15:56:08,610 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 03:56:08" (1/1) ... [2018-10-22 15:56:08,613 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ac5f7a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:08, skipping insertion in model container [2018-10-22 15:56:08,613 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 03:56:08" (1/1) ... [2018-10-22 15:56:08,624 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 15:56:08,646 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 15:56:08,873 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 15:56:08,884 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 15:56:08,905 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 15:56:08,922 INFO L193 MainTranslator]: Completed translation [2018-10-22 15:56:08,923 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:08 WrapperNode [2018-10-22 15:56:08,923 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 15:56:08,924 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 15:56:08,924 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 15:56:08,924 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 15:56:08,933 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:08" (1/1) ... [2018-10-22 15:56:08,941 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:08" (1/1) ... [2018-10-22 15:56:08,966 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 15:56:08,967 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 15:56:08,967 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 15:56:08,967 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 15:56:08,977 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:08" (1/1) ... [2018-10-22 15:56:08,978 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:08" (1/1) ... [2018-10-22 15:56:08,979 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:08" (1/1) ... [2018-10-22 15:56:08,980 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:08" (1/1) ... [2018-10-22 15:56:08,985 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:08" (1/1) ... [2018-10-22 15:56:08,990 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:08" (1/1) ... [2018-10-22 15:56:08,991 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:08" (1/1) ... [2018-10-22 15:56:08,994 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 15:56:08,994 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 15:56:08,994 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 15:56:08,995 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 15:56:08,996 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:08" (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 [2018-10-22 15:56:09,128 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 15:56:09,129 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 15:56:09,129 INFO L130 BoogieDeclarations]: Found specification of procedure linear_search [2018-10-22 15:56:09,129 INFO L138 BoogieDeclarations]: Found implementation of procedure linear_search [2018-10-22 15:56:09,129 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 15:56:09,129 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 15:56:09,130 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 15:56:09,130 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 15:56:09,130 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 15:56:09,130 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 15:56:09,534 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 15:56:09,535 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 03:56:09 BoogieIcfgContainer [2018-10-22 15:56:09,535 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 15:56:09,536 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 15:56:09,536 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 15:56:09,539 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 15:56:09,539 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 03:56:08" (1/3) ... [2018-10-22 15:56:09,540 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14bde098 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 03:56:09, skipping insertion in model container [2018-10-22 15:56:09,540 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:08" (2/3) ... [2018-10-22 15:56:09,541 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14bde098 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 03:56:09, skipping insertion in model container [2018-10-22 15:56:09,541 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 03:56:09" (3/3) ... [2018-10-22 15:56:09,542 INFO L112 eAbstractionObserver]: Analyzing ICFG linear_sea.ch_true-unreach-call.i [2018-10-22 15:56:09,551 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 15:56:09,560 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 15:56:09,578 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 15:56:09,610 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 15:56:09,611 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 15:56:09,611 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 15:56:09,611 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 15:56:09,612 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 15:56:09,612 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 15:56:09,612 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 15:56:09,612 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 15:56:09,612 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 15:56:09,630 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2018-10-22 15:56:09,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 15:56:09,642 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:09,643 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:09,646 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:09,657 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:09,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1679407704, now seen corresponding path program 1 times [2018-10-22 15:56:09,660 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:09,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:09,721 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:09,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:09,722 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:09,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:09,878 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:09,880 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:56:09,881 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 15:56:09,881 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 15:56:09,886 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 15:56:09,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 15:56:09,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 15:56:09,903 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 2 states. [2018-10-22 15:56:09,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:09,926 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2018-10-22 15:56:09,927 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 15:56:09,928 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-10-22 15:56:09,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:09,938 INFO L225 Difference]: With dead ends: 44 [2018-10-22 15:56:09,939 INFO L226 Difference]: Without dead ends: 21 [2018-10-22 15:56:09,943 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 [2018-10-22 15:56:09,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-22 15:56:09,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-22 15:56:09,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-22 15:56:09,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2018-10-22 15:56:09,989 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 17 [2018-10-22 15:56:09,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:09,990 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2018-10-22 15:56:09,990 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 15:56:09,990 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2018-10-22 15:56:09,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-22 15:56:09,993 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:09,993 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:09,993 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:09,994 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:09,996 INFO L82 PathProgramCache]: Analyzing trace with hash -1597240285, now seen corresponding path program 1 times [2018-10-22 15:56:09,996 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:09,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:09,997 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:09,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:09,998 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:10,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:10,370 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:10,371 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:56:10,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-10-22 15:56:10,371 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 15:56:10,373 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 15:56:10,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 15:56:10,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-22 15:56:10,374 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 6 states. [2018-10-22 15:56:10,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:10,466 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2018-10-22 15:56:10,469 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 15:56:10,469 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-22 15:56:10,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:10,470 INFO L225 Difference]: With dead ends: 29 [2018-10-22 15:56:10,471 INFO L226 Difference]: Without dead ends: 21 [2018-10-22 15:56:10,472 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-10-22 15:56:10,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-22 15:56:10,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-22 15:56:10,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-22 15:56:10,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-10-22 15:56:10,479 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 20 [2018-10-22 15:56:10,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:10,479 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-10-22 15:56:10,479 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 15:56:10,479 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-10-22 15:56:10,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-22 15:56:10,480 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:10,481 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:10,481 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:10,481 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:10,482 INFO L82 PathProgramCache]: Analyzing trace with hash 145570050, now seen corresponding path program 1 times [2018-10-22 15:56:10,482 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:10,485 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:10,485 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:10,485 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:10,485 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:10,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:10,850 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 9 DAG size of output: 8 [2018-10-22 15:56:10,852 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:10,853 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:56:10,853 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-22 15:56:10,853 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 15:56:10,854 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 15:56:10,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 15:56:10,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-22 15:56:10,855 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2018-10-22 15:56:11,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:11,104 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2018-10-22 15:56:11,107 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 15:56:11,108 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2018-10-22 15:56:11,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:11,109 INFO L225 Difference]: With dead ends: 34 [2018-10-22 15:56:11,109 INFO L226 Difference]: Without dead ends: 25 [2018-10-22 15:56:11,111 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-22 15:56:11,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-22 15:56:11,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-22 15:56:11,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-22 15:56:11,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2018-10-22 15:56:11,123 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 20 [2018-10-22 15:56:11,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:11,124 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2018-10-22 15:56:11,125 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 15:56:11,125 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2018-10-22 15:56:11,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-22 15:56:11,126 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:11,126 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:11,126 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:11,128 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:11,128 INFO L82 PathProgramCache]: Analyzing trace with hash -1819847252, now seen corresponding path program 1 times [2018-10-22 15:56:11,128 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:11,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:11,129 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:11,130 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:11,130 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:11,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:11,822 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2018-10-22 15:56:11,982 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:11,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:11,983 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:56:11,984 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-10-22 15:56:11,986 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [6], [8], [11], [17], [19], [26], [27], [31], [33], [37], [40], [42], [48], [49], [50], [52], [53], [54] [2018-10-22 15:56:12,036 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 15:56:12,036 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 15:56:12,199 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 15:56:15,915 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 15:56:15,917 INFO L272 AbstractInterpreter]: Visited 21 different actions 269 times. Merged at 7 different actions 217 times. Widened at 1 different actions 27 times. Found 32 fixpoints after 2 different actions. Largest state had 29 variables. [2018-10-22 15:56:15,942 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:15,943 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 15:56:15,943 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:15,943 INFO L197 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 [2018-10-22 15:56:15,957 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:15,957 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:56:16,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:16,017 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:16,374 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:16,374 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:16,643 WARN L179 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 20 [2018-10-22 15:56:17,210 WARN L179 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2018-10-22 15:56:17,583 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:17,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:17,605 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:56:17,625 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:17,625 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:56:17,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:17,713 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:23,680 WARN L179 SmtUtils]: Spent 2.18 s on a formula simplification. DAG size of input: 35 DAG size of output: 13 [2018-10-22 15:56:25,526 WARN L179 SmtUtils]: Spent 1.73 s on a formula simplification that was a NOOP. DAG size: 19 [2018-10-22 15:56:25,987 WARN L179 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2018-10-22 15:56:26,906 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:26,906 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:27,317 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:27,319 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:56:27,320 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 8, 7] total 25 [2018-10-22 15:56:27,320 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:56:27,321 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 15:56:27,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 15:56:27,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=463, Unknown=0, NotChecked=0, Total=600 [2018-10-22 15:56:27,324 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 10 states. [2018-10-22 15:56:32,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:32,503 INFO L93 Difference]: Finished difference Result 43 states and 47 transitions. [2018-10-22 15:56:32,509 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 15:56:32,510 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2018-10-22 15:56:32,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:32,513 INFO L225 Difference]: With dead ends: 43 [2018-10-22 15:56:32,514 INFO L226 Difference]: Without dead ends: 34 [2018-10-22 15:56:32,515 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 74 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=204, Invalid=663, Unknown=3, NotChecked=0, Total=870 [2018-10-22 15:56:32,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-22 15:56:32,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2018-10-22 15:56:32,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-22 15:56:32,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2018-10-22 15:56:32,522 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 24 [2018-10-22 15:56:32,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:32,522 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2018-10-22 15:56:32,522 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 15:56:32,522 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2018-10-22 15:56:32,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-22 15:56:32,523 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:32,524 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:32,524 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:32,524 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:32,525 INFO L82 PathProgramCache]: Analyzing trace with hash 2082093034, now seen corresponding path program 1 times [2018-10-22 15:56:32,525 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:32,526 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:32,526 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:32,526 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:32,526 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:32,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:33,304 WARN L179 SmtUtils]: Spent 632.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 27 [2018-10-22 15:56:33,662 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 21 [2018-10-22 15:56:33,756 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:33,757 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:33,757 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:56:33,757 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-10-22 15:56:33,757 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [6], [8], [11], [13], [17], [19], [26], [27], [31], [33], [37], [40], [42], [48], [49], [50], [52], [53], [54] [2018-10-22 15:56:33,761 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 15:56:33,761 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 15:56:33,774 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 15:56:36,893 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 15:56:36,893 INFO L272 AbstractInterpreter]: Visited 22 different actions 329 times. Merged at 8 different actions 239 times. Widened at 1 different actions 28 times. Found 70 fixpoints after 4 different actions. Largest state had 29 variables. [2018-10-22 15:56:36,930 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:36,931 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 15:56:36,931 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:36,931 INFO L197 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 [2018-10-22 15:56:36,947 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:36,947 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:56:36,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:36,982 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:37,015 WARN L307 Elim1Store]: Array PQE input equivalent to false [2018-10-22 15:56:37,016 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:37,199 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 21 treesize of output 18 [2018-10-22 15:56:37,210 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 18 treesize of output 17 [2018-10-22 15:56:37,211 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:37,241 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:37,264 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:37,264 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 2 variables, input treesize:91, output treesize:17 [2018-10-22 15:56:38,126 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:38,126 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:38,238 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 49 [2018-10-22 15:56:39,084 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:39,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:39,105 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:56:39,121 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:39,122 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:56:39,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:39,223 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:39,240 WARN L307 Elim1Store]: Array PQE input equivalent to false [2018-10-22 15:56:39,240 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:39,248 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 45 treesize of output 42 [2018-10-22 15:56:39,251 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 18 treesize of output 17 [2018-10-22 15:56:39,252 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:39,271 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:39,278 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 44 treesize of output 41 [2018-10-22 15:56:39,293 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 18 treesize of output 17 [2018-10-22 15:56:39,294 INFO L267 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:39,316 INFO L267 ElimStorePlain]: Start of recursive call 5: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:39,324 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 45 treesize of output 42 [2018-10-22 15:56:39,329 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 18 treesize of output 17 [2018-10-22 15:56:39,330 INFO L267 ElimStorePlain]: Start of recursive call 8: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:39,351 INFO L267 ElimStorePlain]: Start of recursive call 7: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:39,360 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 46 treesize of output 43 [2018-10-22 15:56:39,364 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 18 treesize of output 17 [2018-10-22 15:56:39,365 INFO L267 ElimStorePlain]: Start of recursive call 10: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:39,381 INFO L267 ElimStorePlain]: Start of recursive call 9: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:39,386 WARN L307 Elim1Store]: Array PQE input equivalent to false [2018-10-22 15:56:39,386 INFO L267 ElimStorePlain]: Start of recursive call 11: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:41,576 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 2 dim-2 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2018-10-22 15:56:41,577 INFO L202 ElimStorePlain]: Needed 11 recursive calls to eliminate 5 variables, input treesize:445, output treesize:66 [2018-10-22 15:56:43,663 WARN L179 SmtUtils]: Spent 2.04 s on a formula simplification. DAG size of input: 38 DAG size of output: 27 [2018-10-22 15:56:44,218 WARN L179 SmtUtils]: Spent 360.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2018-10-22 15:56:45,261 WARN L179 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2018-10-22 15:56:47,454 WARN L179 SmtUtils]: Spent 2.10 s on a formula simplification that was a NOOP. DAG size: 57 [2018-10-22 15:56:49,546 WARN L179 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 43 [2018-10-22 15:56:49,727 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 41 [2018-10-22 15:56:49,839 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:49,840 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:49,984 WARN L179 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 47 [2018-10-22 15:56:50,540 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 37 [2018-10-22 15:56:51,069 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2018-10-22 15:56:51,255 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2018-10-22 15:56:51,278 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:51,281 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:56:51,281 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 10, 10, 9] total 39 [2018-10-22 15:56:51,281 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:56:51,282 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 15:56:51,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 15:56:51,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=1281, Unknown=0, NotChecked=0, Total=1482 [2018-10-22 15:56:51,285 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 16 states. [2018-10-22 15:56:52,050 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 47 [2018-10-22 15:56:53,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:53,668 INFO L93 Difference]: Finished difference Result 55 states and 62 transitions. [2018-10-22 15:56:53,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 15:56:53,669 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 24 [2018-10-22 15:56:53,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:53,670 INFO L225 Difference]: With dead ends: 55 [2018-10-22 15:56:53,670 INFO L226 Difference]: Without dead ends: 43 [2018-10-22 15:56:53,673 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 569 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=263, Invalid=1717, Unknown=0, NotChecked=0, Total=1980 [2018-10-22 15:56:53,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-22 15:56:53,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 29. [2018-10-22 15:56:53,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-22 15:56:53,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2018-10-22 15:56:53,681 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 24 [2018-10-22 15:56:53,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:53,681 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2018-10-22 15:56:53,681 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 15:56:53,681 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2018-10-22 15:56:53,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-22 15:56:53,682 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:53,683 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:53,683 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:53,683 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:53,683 INFO L82 PathProgramCache]: Analyzing trace with hash -1253110442, now seen corresponding path program 2 times [2018-10-22 15:56:53,683 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:53,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:53,684 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:53,685 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:53,685 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:53,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:53,973 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:53,973 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:53,973 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:56:53,973 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:56:53,974 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:56:53,974 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:53,974 INFO L197 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 [2018-10-22 15:56:53,984 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:56:53,984 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:56:54,015 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2018-10-22 15:56:54,016 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:54,019 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:54,331 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-10-22 15:56:54,331 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:54,657 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-10-22 15:56:54,680 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:54,680 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:56:54,697 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:56:54,698 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:56:54,767 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2018-10-22 15:56:54,767 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:54,773 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:57:06,814 WARN L179 SmtUtils]: Spent 4.09 s on a formula simplification that was a NOOP. DAG size: 24 [2018-10-22 15:57:08,859 WARN L179 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 19 [2018-10-22 15:57:11,383 WARN L179 SmtUtils]: Spent 2.17 s on a formula simplification that was a NOOP. DAG size: 23 [2018-10-22 15:57:11,394 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-10-22 15:57:11,395 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:57:12,226 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-10-22 15:57:12,228 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:57:12,229 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6, 7, 6] total 25 [2018-10-22 15:57:12,229 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:57:12,229 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 15:57:12,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 15:57:12,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=483, Unknown=3, NotChecked=0, Total=600 [2018-10-22 15:57:12,230 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 13 states. [2018-10-22 15:57:18,272 WARN L179 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 22 [2018-10-22 15:57:26,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:57:26,749 INFO L93 Difference]: Finished difference Result 52 states and 58 transitions. [2018-10-22 15:57:26,749 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 15:57:26,749 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 28 [2018-10-22 15:57:26,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:57:26,752 INFO L225 Difference]: With dead ends: 52 [2018-10-22 15:57:26,752 INFO L226 Difference]: Without dead ends: 40 [2018-10-22 15:57:26,753 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 85 SyntacticMatches, 13 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 30.1s TimeCoverageRelationStatistics Valid=247, Invalid=933, Unknown=10, NotChecked=0, Total=1190 [2018-10-22 15:57:26,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-22 15:57:26,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 29. [2018-10-22 15:57:26,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-22 15:57:26,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2018-10-22 15:57:26,761 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 28 [2018-10-22 15:57:26,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:57:26,762 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2018-10-22 15:57:26,762 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 15:57:26,762 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2018-10-22 15:57:26,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-22 15:57:26,763 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:57:26,763 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:57:26,764 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:57:26,764 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:57:26,764 INFO L82 PathProgramCache]: Analyzing trace with hash -1646137452, now seen corresponding path program 2 times [2018-10-22 15:57:26,764 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:57:26,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:57:26,765 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:57:26,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:57:26,766 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:57:26,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:57:27,490 WARN L179 SmtUtils]: Spent 503.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 24 [2018-10-22 15:57:27,648 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2018-10-22 15:57:27,848 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 28 [2018-10-22 15:57:28,067 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 49 [2018-10-22 15:57:28,196 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 57 [2018-10-22 15:57:30,769 WARN L179 SmtUtils]: Spent 2.10 s on a formula simplification. DAG size of input: 79 DAG size of output: 41 [2018-10-22 15:57:30,777 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:57:30,777 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:30,777 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:57:30,777 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:57:30,778 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:57:30,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:30,778 INFO L197 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 [2018-10-22 15:57:30,786 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:57:30,786 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:57:30,841 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:57:30,841 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:57:30,846 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:57:30,865 WARN L307 Elim1Store]: Array PQE input equivalent to false [2018-10-22 15:57:30,866 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:34,940 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 21 treesize of output 18 [2018-10-22 15:57:34,943 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 18 treesize of output 17 [2018-10-22 15:57:34,943 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:34,946 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:34,949 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:34,949 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 2 variables, input treesize:91, output treesize:17 [2018-10-22 15:57:35,875 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:57:35,876 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:57:36,048 WARN L179 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 68 [2018-10-22 15:57:37,079 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 51 [2018-10-22 15:57:38,160 WARN L179 SmtUtils]: Spent 594.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2018-10-22 15:57:38,398 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:57:38,421 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:38,421 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:57:38,437 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:57:38,438 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:57:38,574 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:57:38,574 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:57:38,582 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:57:38,613 WARN L307 Elim1Store]: Array PQE input equivalent to false [2018-10-22 15:57:38,613 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:38,629 WARN L307 Elim1Store]: Array PQE input equivalent to false [2018-10-22 15:57:38,630 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:38,646 WARN L307 Elim1Store]: Array PQE input equivalent to false [2018-10-22 15:57:38,647 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:40,795 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 39 treesize of output 36 [2018-10-22 15:57:40,798 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 18 treesize of output 17 [2018-10-22 15:57:40,799 INFO L267 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:42,823 INFO L267 ElimStorePlain]: Start of recursive call 5: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:42,828 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 34 treesize of output 31 [2018-10-22 15:57:42,831 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 18 treesize of output 17 [2018-10-22 15:57:42,832 INFO L267 ElimStorePlain]: Start of recursive call 8: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:42,842 INFO L267 ElimStorePlain]: Start of recursive call 7: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:42,873 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 2 dim-2 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2018-10-22 15:57:42,874 INFO L202 ElimStorePlain]: Needed 8 recursive calls to eliminate 5 variables, input treesize:445, output treesize:66 [2018-10-22 15:57:51,453 WARN L179 SmtUtils]: Spent 8.48 s on a formula simplification. DAG size of input: 38 DAG size of output: 27 [2018-10-22 15:57:51,770 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2018-10-22 15:57:56,335 WARN L179 SmtUtils]: Spent 4.10 s on a formula simplification that was a NOOP. DAG size: 52 [2018-10-22 15:57:57,766 WARN L179 SmtUtils]: Spent 755.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 56 [2018-10-22 15:57:58,392 WARN L179 SmtUtils]: Spent 435.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2018-10-22 15:57:59,221 WARN L179 SmtUtils]: Spent 196.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2018-10-22 15:58:00,927 WARN L179 SmtUtils]: Spent 1.30 s on a formula simplification. DAG size of input: 56 DAG size of output: 56 [2018-10-22 15:58:01,236 WARN L179 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2018-10-22 15:58:01,402 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:58:01,402 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:58:01,655 WARN L179 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 71 [2018-10-22 15:58:01,816 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 60 [2018-10-22 15:58:01,937 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2018-10-22 15:58:02,739 WARN L179 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 44 [2018-10-22 15:58:03,430 WARN L179 SmtUtils]: Spent 291.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2018-10-22 15:58:03,805 WARN L179 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 55 [2018-10-22 15:58:04,105 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2018-10-22 15:58:04,445 WARN L179 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2018-10-22 15:58:04,791 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2018-10-22 15:58:04,864 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:58:04,866 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:58:04,866 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 14, 13] total 55 [2018-10-22 15:58:04,866 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:58:04,867 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 15:58:04,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 15:58:04,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=2639, Unknown=0, NotChecked=0, Total=2970 [2018-10-22 15:58:04,869 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 22 states. [2018-10-22 15:58:05,424 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 48 [2018-10-22 15:58:06,395 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 55 [2018-10-22 15:58:06,615 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 59 [2018-10-22 15:58:06,913 WARN L179 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 61 [2018-10-22 15:58:07,279 WARN L179 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 92 [2018-10-22 15:58:08,134 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 75 [2018-10-22 15:58:08,419 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 73 [2018-10-22 15:58:09,007 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 106 DAG size of output: 78 [2018-10-22 15:58:09,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:58:09,072 INFO L93 Difference]: Finished difference Result 59 states and 66 transitions. [2018-10-22 15:58:09,072 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 15:58:09,073 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 28 [2018-10-22 15:58:09,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:58:09,074 INFO L225 Difference]: With dead ends: 59 [2018-10-22 15:58:09,074 INFO L226 Difference]: Without dead ends: 47 [2018-10-22 15:58:09,076 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 67 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1313 ImplicationChecksByTransitivity, 31.6s TimeCoverageRelationStatistics Valid=487, Invalid=4205, Unknown=0, NotChecked=0, Total=4692 [2018-10-22 15:58:09,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-10-22 15:58:09,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 33. [2018-10-22 15:58:09,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-22 15:58:09,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2018-10-22 15:58:09,082 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 28 [2018-10-22 15:58:09,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:58:09,083 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2018-10-22 15:58:09,083 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 15:58:09,083 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2018-10-22 15:58:09,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-22 15:58:09,084 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:58:09,084 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:58:09,084 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:58:09,084 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:58:09,084 INFO L82 PathProgramCache]: Analyzing trace with hash 1637712594, now seen corresponding path program 3 times [2018-10-22 15:58:09,084 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:58:09,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:58:09,085 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:58:09,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:58:09,085 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:58:09,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:58:09,141 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-22 15:58:09,142 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:58:09,142 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 15:58:09,142 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 15:58:09,143 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 15:58:09,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 15:58:09,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 15:58:09,144 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 3 states. [2018-10-22 15:58:09,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:58:09,170 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2018-10-22 15:58:09,171 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 15:58:09,171 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2018-10-22 15:58:09,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:58:09,172 INFO L225 Difference]: With dead ends: 56 [2018-10-22 15:58:09,172 INFO L226 Difference]: Without dead ends: 33 [2018-10-22 15:58:09,173 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 [2018-10-22 15:58:09,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-22 15:58:09,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-10-22 15:58:09,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-22 15:58:09,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-22 15:58:09,178 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 28 [2018-10-22 15:58:09,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:58:09,179 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-22 15:58:09,179 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 15:58:09,179 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-22 15:58:09,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-22 15:58:09,180 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:58:09,180 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:58:09,180 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:58:09,180 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:58:09,180 INFO L82 PathProgramCache]: Analyzing trace with hash -1605254594, now seen corresponding path program 4 times [2018-10-22 15:58:09,180 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:58:09,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:58:09,181 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:58:09,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:58:09,181 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:58:09,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:58:09,730 WARN L179 SmtUtils]: Spent 375.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 35 [2018-10-22 15:58:14,935 WARN L179 SmtUtils]: Spent 2.17 s on a formula simplification that was a NOOP. DAG size: 50 [2018-10-22 15:58:17,033 WARN L179 SmtUtils]: Spent 2.05 s on a formula simplification. DAG size of input: 48 DAG size of output: 31 [2018-10-22 15:58:19,197 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 23 refuted. 1 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:58:19,197 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:58:19,197 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:58:19,197 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:58:19,198 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:58:19,198 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:58:19,198 INFO L197 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 [2018-10-22 15:58:19,207 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:58:19,207 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 15:58:19,281 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:58:19,281 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:58:19,285 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:58:19,291 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 31 treesize of output 28 [2018-10-22 15:58:19,297 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 18 treesize of output 17 [2018-10-22 15:58:19,297 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:58:19,307 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:58:19,317 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 30 treesize of output 27 [2018-10-22 15:58:19,319 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 18 treesize of output 17 [2018-10-22 15:58:19,320 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-22 15:58:19,333 INFO L267 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:58:25,378 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:58:25,378 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 2 variables, input treesize:100, output treesize:21 [2018-10-22 15:58:28,221 WARN L179 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 47 [2018-10-22 15:58:28,930 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 54 [2018-10-22 15:58:30,879 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:58:30,879 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:58:33,831 WARN L179 SmtUtils]: Spent 2.95 s on a formula simplification. DAG size of input: 121 DAG size of output: 89 [2018-10-22 15:58:36,545 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2018-10-22 15:58:37,560 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2018-10-22 15:58:37,964 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2018-10-22 15:58:40,909 WARN L179 SmtUtils]: Spent 325.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 64 [2018-10-22 15:58:41,529 WARN L179 SmtUtils]: Spent 305.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 81 [2018-10-22 15:58:41,555 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:58:41,575 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:58:41,576 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:58:41,591 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:58:41,591 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 15:58:41,723 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:58:41,723 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:58:41,728 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:58:41,732 WARN L307 Elim1Store]: Array PQE input equivalent to false [2018-10-22 15:58:41,732 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-10-22 15:58:49,791 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 21 treesize of output 18 [2018-10-22 15:58:49,793 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 18 treesize of output 17 [2018-10-22 15:58:49,793 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-10-22 15:58:49,795 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:58:49,800 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:58:49,801 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 2 variables, input treesize:100, output treesize:21 [2018-10-22 15:58:53,387 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 42 [2018-10-22 15:58:54,357 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:58:54,357 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:58:54,509 WARN L179 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 59 [2018-10-22 15:58:55,483 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 39 [2018-10-22 15:58:58,969 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2018-10-22 15:58:59,402 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2018-10-22 15:59:00,015 WARN L179 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 54 [2018-10-22 15:59:00,487 WARN L179 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2018-10-22 15:59:00,510 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:59:00,513 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:59:00,513 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 16, 16, 15, 14] total 64 [2018-10-22 15:59:00,513 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:59:00,514 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-22 15:59:00,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-22 15:59:00,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=3727, Unknown=2, NotChecked=0, Total=4032 [2018-10-22 15:59:00,516 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 27 states. [2018-10-22 15:59:01,571 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 45 [2018-10-22 15:59:02,079 WARN L179 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 50 [2018-10-22 15:59:02,454 WARN L179 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 62 [2018-10-22 15:59:03,432 WARN L179 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 76 [2018-10-22 15:59:08,021 WARN L179 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 69 [2018-10-22 15:59:11,521 WARN L179 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 72 [2018-10-22 15:59:12,118 WARN L179 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 124 DAG size of output: 77 [2018-10-22 15:59:12,421 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 61 [2018-10-22 15:59:12,817 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 50 [2018-10-22 15:59:12,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:59:12,897 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-22 15:59:12,898 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 15:59:12,898 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 32 [2018-10-22 15:59:12,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:59:12,899 INFO L225 Difference]: With dead ends: 48 [2018-10-22 15:59:12,900 INFO L226 Difference]: Without dead ends: 38 [2018-10-22 15:59:12,903 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 74 SyntacticMatches, 6 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1503 ImplicationChecksByTransitivity, 44.4s TimeCoverageRelationStatistics Valid=558, Invalid=5443, Unknown=5, NotChecked=0, Total=6006 [2018-10-22 15:59:12,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-22 15:59:12,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2018-10-22 15:59:12,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-22 15:59:12,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-10-22 15:59:12,910 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 32 [2018-10-22 15:59:12,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:59:12,910 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-10-22 15:59:12,910 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-22 15:59:12,910 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-10-22 15:59:12,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-22 15:59:12,911 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:59:12,912 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:59:12,912 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:59:12,912 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:59:12,912 INFO L82 PathProgramCache]: Analyzing trace with hash 1810116584, now seen corresponding path program 5 times [2018-10-22 15:59:12,912 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:59:12,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:59:12,913 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:59:12,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:59:12,913 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:59:12,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:59:13,988 WARN L179 SmtUtils]: Spent 889.00 ms on a formula simplification. DAG size of input: 110 DAG size of output: 34 [2018-10-22 15:59:16,657 WARN L179 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 68 [2018-10-22 15:59:16,840 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 48 [2018-10-22 15:59:18,369 WARN L179 SmtUtils]: Spent 1.49 s on a formula simplification. DAG size of input: 80 DAG size of output: 62 [2018-10-22 15:59:42,910 WARN L179 SmtUtils]: Spent 24.36 s on a formula simplification. DAG size of input: 84 DAG size of output: 75 [2018-10-22 15:59:50,499 WARN L179 SmtUtils]: Spent 5.50 s on a formula simplification. DAG size of input: 81 DAG size of output: 63 [2018-10-22 15:59:50,731 WARN L179 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 52 [2018-10-22 15:59:50,744 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:59:50,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:59:50,745 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:59:50,745 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:59:50,745 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:59:50,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:59:50,745 INFO L197 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 [2018-10-22 15:59:50,753 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:59:50,753 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:59:51,140 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2018-10-22 15:59:51,140 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:59:51,145 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:59:51,155 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 31 treesize of output 28 [2018-10-22 15:59:51,160 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 18 treesize of output 17 [2018-10-22 15:59:51,161 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:51,169 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:51,174 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 30 treesize of output 27 [2018-10-22 15:59:51,186 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 18 treesize of output 17 [2018-10-22 15:59:51,186 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:51,195 INFO L267 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:53,227 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:53,227 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 2 variables, input treesize:100, output treesize:21 [2018-10-22 15:59:58,820 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2018-10-22 15:59:59,360 WARN L179 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 60 [2018-10-22 16:00:03,909 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 44 [2018-10-22 16:00:06,583 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:06,584 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:07,009 WARN L179 SmtUtils]: Spent 423.00 ms on a formula simplification. DAG size of input: 124 DAG size of output: 98 [2018-10-22 16:00:07,197 WARN L179 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 61 [2018-10-22 16:00:08,173 WARN L179 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 48 [2018-10-22 16:00:08,856 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2018-10-22 16:00:09,151 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2018-10-22 16:00:10,845 WARN L179 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2018-10-22 16:00:11,372 WARN L179 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2018-10-22 16:00:12,701 WARN L179 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2018-10-22 16:00:13,318 WARN L179 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2018-10-22 16:00:14,381 WARN L179 SmtUtils]: Spent 420.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 71 [2018-10-22 16:00:15,112 WARN L179 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2018-10-22 16:00:17,823 WARN L179 SmtUtils]: Spent 725.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 76 [2018-10-22 16:00:17,951 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:17,981 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:17,981 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:18,019 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:18,019 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:18,234 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2018-10-22 16:00:18,235 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:18,241 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:18,250 WARN L307 Elim1Store]: Array PQE input equivalent to false [2018-10-22 16:00:18,250 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-10-22 16:00:18,257 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 46 treesize of output 43 [2018-10-22 16:00:18,272 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 18 treesize of output 17 [2018-10-22 16:00:18,273 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-10-22 16:00:18,287 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:00:18,289 WARN L307 Elim1Store]: Array PQE input equivalent to false [2018-10-22 16:00:18,290 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-22 16:00:18,296 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 45 treesize of output 42 [2018-10-22 16:00:18,313 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 18 treesize of output 17 [2018-10-22 16:00:18,314 INFO L267 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2018-10-22 16:00:18,338 INFO L267 ElimStorePlain]: Start of recursive call 6: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:00:18,343 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 45 treesize of output 42 [2018-10-22 16:00:18,346 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 18 treesize of output 17 [2018-10-22 16:00:18,346 INFO L267 ElimStorePlain]: Start of recursive call 9: End of recursive call: and 1 xjuncts. [2018-10-22 16:00:20,372 INFO L267 ElimStorePlain]: Start of recursive call 8: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:00:20,377 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 44 treesize of output 41 [2018-10-22 16:00:20,380 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 18 treesize of output 17 [2018-10-22 16:00:20,380 INFO L267 ElimStorePlain]: Start of recursive call 11: End of recursive call: and 1 xjuncts. [2018-10-22 16:00:22,409 INFO L267 ElimStorePlain]: Start of recursive call 10: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:00:24,514 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 2 dim-2 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2018-10-22 16:00:24,514 INFO L202 ElimStorePlain]: Needed 11 recursive calls to eliminate 5 variables, input treesize:445, output treesize:66 Received shutdown request... [2018-10-22 16:00:35,056 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-22 16:00:35,256 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:35,257 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-22 16:00:35,263 WARN L205 ceAbstractionStarter]: Timeout [2018-10-22 16:00:35,263 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 04:00:35 BoogieIcfgContainer [2018-10-22 16:00:35,263 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-22 16:00:35,264 INFO L168 Benchmark]: Toolchain (without parser) took 266660.94 ms. Allocated memory was 1.5 GB in the beginning and 3.1 GB in the end (delta: 1.5 GB). Free memory was 1.4 GB in the beginning and 2.8 GB in the end (delta: -1.4 GB). Peak memory consumption was 129.2 MB. Max. memory is 7.1 GB. [2018-10-22 16:00:35,265 INFO L168 Benchmark]: CDTParser took 0.18 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. [2018-10-22 16:00:35,265 INFO L168 Benchmark]: CACSL2BoogieTranslator took 318.60 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. [2018-10-22 16:00:35,265 INFO L168 Benchmark]: Boogie Procedure Inliner took 42.67 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. [2018-10-22 16:00:35,266 INFO L168 Benchmark]: Boogie Preprocessor took 26.90 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. [2018-10-22 16:00:35,266 INFO L168 Benchmark]: RCFGBuilder took 540.78 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 752.4 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -795.7 MB). Peak memory consumption was 15.3 MB. Max. memory is 7.1 GB. [2018-10-22 16:00:35,266 INFO L168 Benchmark]: TraceAbstraction took 265727.45 ms. Allocated memory was 2.3 GB in the beginning and 3.1 GB in the end (delta: 787.5 MB). Free memory was 2.2 GB in the beginning and 2.8 GB in the end (delta: -625.5 MB). Peak memory consumption was 162.0 MB. Max. memory is 7.1 GB. [2018-10-22 16:00:35,269 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 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 318.60 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 42.67 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 26.90 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 540.78 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 752.4 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -795.7 MB). Peak memory consumption was 15.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 265727.45 ms. Allocated memory was 2.3 GB in the beginning and 3.1 GB in the end (delta: 787.5 MB). Free memory was 2.2 GB in the beginning and 2.8 GB in the end (delta: -625.5 MB). Peak memory consumption was 162.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 37 with TraceHistMax 5,while TraceCheckSpWp was constructing forward predicates,while PredicateComparison was comparing new predicate (quantified with 0quantifier alternations) to 51 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 28 locations, 1 error locations. TIMEOUT Result, 265.6s OverallTime, 10 OverallIterations, 5 TraceHistogramMax, 39.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 180 SDtfs, 248 SDslu, 886 SDs, 0 SdLazy, 1018 SolverSat, 86 SolverUnsat, 2 SolverUnknown, 0 SolverNotchecked, 5.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 660 GetRequests, 371 SyntacticMatches, 32 SemanticMatches, 257 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3904 ImplicationChecksByTransitivity, 135.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=37occurred in iteration=9, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 7.1s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 9 MinimizatonAttempts, 45 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 1.0s SatisfiabilityAnalysisTime, 135.2s InterpolantComputationTime, 493 NumberOfCodeBlocks, 477 NumberOfCodeBlocksAsserted, 23 NumberOfCheckSat, 736 ConstructedInterpolants, 174 QuantifiedInterpolants, 718720 SizeOfPredicates, 152 NumberOfNonLiveVariables, 1332 ConjunctsInSsa, 363 ConjunctsInUnsatCore, 29 InterpolantComputations, 4 PerfectInterpolantSequences, 45/292 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown