java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_compound_exp_cong.epf -i ../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/PointerIncrement-simplified03.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-1de736e-m [2019-02-18 09:26:03,771 INFO L170 SettingsManager]: Resetting all preferences to default values... [2019-02-18 09:26:03,773 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2019-02-18 09:26:03,790 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-02-18 09:26:03,791 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-02-18 09:26:03,792 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-02-18 09:26:03,793 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-02-18 09:26:03,795 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2019-02-18 09:26:03,797 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-02-18 09:26:03,797 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-02-18 09:26:03,798 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2019-02-18 09:26:03,823 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_compound_exp_cong.epf [2019-02-18 09:26:03,844 INFO L110 SettingsManager]: Loading preferences was successful [2019-02-18 09:26:03,844 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2019-02-18 09:26:03,845 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2019-02-18 09:26:03,845 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2019-02-18 09:26:03,846 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-02-18 09:26:03,846 INFO L133 SettingsManager]: * User list type=DISABLED [2019-02-18 09:26:03,846 INFO L133 SettingsManager]: * Inline calls to unimplemented procedures=true [2019-02-18 09:26:03,846 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-02-18 09:26:03,846 INFO L133 SettingsManager]: * Explicit value domain=true [2019-02-18 09:26:03,847 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-02-18 09:26:03,847 INFO L133 SettingsManager]: * Octagon Domain=false [2019-02-18 09:26:03,847 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2019-02-18 09:26:03,847 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-02-18 09:26:03,847 INFO L133 SettingsManager]: * Interval Domain=false [2019-02-18 09:26:03,848 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-02-18 09:26:03,848 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2019-02-18 09:26:03,848 INFO L133 SettingsManager]: * Use SBE=true [2019-02-18 09:26:03,849 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-02-18 09:26:03,849 INFO L133 SettingsManager]: * sizeof long=4 [2019-02-18 09:26:03,849 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2019-02-18 09:26:03,849 INFO L133 SettingsManager]: * sizeof POINTER=4 [2019-02-18 09:26:03,849 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2019-02-18 09:26:03,850 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-02-18 09:26:03,850 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-02-18 09:26:03,850 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-02-18 09:26:03,850 INFO L133 SettingsManager]: * sizeof long double=12 [2019-02-18 09:26:03,850 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2019-02-18 09:26:03,850 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-02-18 09:26:03,851 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-02-18 09:26:03,851 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-02-18 09:26:03,851 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2019-02-18 09:26:03,851 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:8092 -smt2 -in -t:10000 [2019-02-18 09:26:03,851 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-02-18 09:26:03,852 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-02-18 09:26:03,852 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-02-18 09:26:03,852 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-02-18 09:26:03,852 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-02-18 09:26:03,852 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:8092 -smt2 -in [2019-02-18 09:26:03,853 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-02-18 09:26:03,853 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-02-18 09:26:03,882 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-02-18 09:26:03,894 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-02-18 09:26:03,899 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-02-18 09:26:03,900 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2019-02-18 09:26:03,901 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2019-02-18 09:26:03,902 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/PointerIncrement-simplified03.bpl [2019-02-18 09:26:03,902 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/PointerIncrement-simplified03.bpl' [2019-02-18 09:26:03,938 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-02-18 09:26:03,940 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-02-18 09:26:03,941 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-02-18 09:26:03,941 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-02-18 09:26:03,941 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2019-02-18 09:26:03,960 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:26:03" (1/1) ... [2019-02-18 09:26:03,972 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:26:03" (1/1) ... [2019-02-18 09:26:03,980 WARN L165 Inliner]: Program contained no entry procedure! [2019-02-18 09:26:03,980 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2019-02-18 09:26:03,980 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2019-02-18 09:26:03,996 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-02-18 09:26:03,997 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-02-18 09:26:03,997 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-02-18 09:26:03,997 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2019-02-18 09:26:04,009 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:26:03" (1/1) ... [2019-02-18 09:26:04,009 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:26:03" (1/1) ... [2019-02-18 09:26:04,010 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:26:03" (1/1) ... [2019-02-18 09:26:04,011 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:26:03" (1/1) ... [2019-02-18 09:26:04,014 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:26:03" (1/1) ... [2019-02-18 09:26:04,018 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:26:03" (1/1) ... [2019-02-18 09:26:04,019 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:26:03" (1/1) ... [2019-02-18 09:26:04,021 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-02-18 09:26:04,022 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-02-18 09:26:04,022 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-02-18 09:26:04,022 INFO L276 PluginConnector]: RCFGBuilder initialized [2019-02-18 09:26:04,023 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:26:03" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:8092 -smt2 -in -t:10000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:8092 -smt2 -in -t:10000 [2019-02-18 09:26:04,085 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-02-18 09:26:04,086 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-02-18 09:26:04,086 INFO L130 BoogieDeclarations]: Found specification of procedure ~malloc [2019-02-18 09:26:04,324 INFO L278 CfgBuilder]: Using library mode [2019-02-18 09:26:04,324 INFO L286 CfgBuilder]: Removed 3 assue(true) statements. [2019-02-18 09:26:04,326 INFO L202 PluginConnector]: Adding new model PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.02 09:26:04 BoogieIcfgContainer [2019-02-18 09:26:04,326 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-02-18 09:26:04,327 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-02-18 09:26:04,327 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-02-18 09:26:04,330 INFO L276 PluginConnector]: TraceAbstraction initialized [2019-02-18 09:26:04,331 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 18.02 09:26:03" (1/2) ... [2019-02-18 09:26:04,332 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42b03888 and model type PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.02 09:26:04, skipping insertion in model container [2019-02-18 09:26:04,332 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.02 09:26:04" (2/2) ... [2019-02-18 09:26:04,335 INFO L112 eAbstractionObserver]: Analyzing ICFG PointerIncrement-simplified03.bpl [2019-02-18 09:26:04,346 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-02-18 09:26:04,355 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-02-18 09:26:04,374 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-02-18 09:26:04,410 INFO L382 AbstractCegarLoop]: Interprodecural is true [2019-02-18 09:26:04,410 INFO L383 AbstractCegarLoop]: Hoare is true [2019-02-18 09:26:04,410 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-02-18 09:26:04,410 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-02-18 09:26:04,410 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-02-18 09:26:04,411 INFO L387 AbstractCegarLoop]: Difference is false [2019-02-18 09:26:04,411 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-02-18 09:26:04,411 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-02-18 09:26:04,427 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2019-02-18 09:26:04,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2019-02-18 09:26:04,436 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:04,438 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2019-02-18 09:26:04,440 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:04,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:04,446 INFO L82 PathProgramCache]: Analyzing trace with hash 29984, now seen corresponding path program 1 times [2019-02-18 09:26:04,449 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:04,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:04,490 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:04,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:04,490 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:04,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:04,654 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:04,657 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-02-18 09:26:04,658 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2019-02-18 09:26:04,658 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-02-18 09:26:04,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-02-18 09:26:04,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-02-18 09:26:04,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-02-18 09:26:04,687 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2019-02-18 09:26:04,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:04,823 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2019-02-18 09:26:04,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-02-18 09:26:04,825 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2019-02-18 09:26:04,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:04,836 INFO L225 Difference]: With dead ends: 15 [2019-02-18 09:26:04,836 INFO L226 Difference]: Without dead ends: 8 [2019-02-18 09:26:04,840 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-02-18 09:26:04,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2019-02-18 09:26:04,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 7. [2019-02-18 09:26:04,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2019-02-18 09:26:04,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2019-02-18 09:26:04,871 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 3 [2019-02-18 09:26:04,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:04,871 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2019-02-18 09:26:04,871 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-02-18 09:26:04,871 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2019-02-18 09:26:04,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-02-18 09:26:04,872 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:04,872 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2019-02-18 09:26:04,873 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:04,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:04,873 INFO L82 PathProgramCache]: Analyzing trace with hash 893294860, now seen corresponding path program 1 times [2019-02-18 09:26:04,873 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:04,875 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:04,875 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:04,875 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:04,875 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:04,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:04,991 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:04,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:04,992 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:04,993 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 7 with the following transitions: [2019-02-18 09:26:04,995 INFO L207 CegarAbsIntRunner]: [0], [6], [7], [8], [12] [2019-02-18 09:26:05,044 INFO L148 AbstractInterpreter]: Using domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2019-02-18 09:26:05,046 INFO L101 FixpointEngine]: Starting fixpoint engine with domain CompoundDomain (maxUnwinding=3, maxParallelStates=2) [2019-02-18 09:26:05,192 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-02-18 09:26:05,194 INFO L272 AbstractInterpreter]: Visited 5 different actions 17 times. Merged at 4 different actions 12 times. Never widened. Performed 84 root evaluator evaluations with a maximum evaluation depth of 3. Performed 84 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2019-02-18 09:26:05,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:05,201 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-02-18 09:26:05,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:05,201 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:05,215 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:05,215 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:26:05,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:05,253 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:05,301 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:05,304 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:05,327 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:05,327 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:05,385 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:05,385 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:05,479 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:05,548 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:05,548 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2019-02-18 09:26:05,549 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:05,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-02-18 09:26:05,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-02-18 09:26:05,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2019-02-18 09:26:05,551 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 6 states. [2019-02-18 09:26:05,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:05,615 INFO L93 Difference]: Finished difference Result 12 states and 12 transitions. [2019-02-18 09:26:05,615 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-02-18 09:26:05,616 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2019-02-18 09:26:05,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:05,616 INFO L225 Difference]: With dead ends: 12 [2019-02-18 09:26:05,616 INFO L226 Difference]: Without dead ends: 11 [2019-02-18 09:26:05,618 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2019-02-18 09:26:05,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2019-02-18 09:26:05,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 10. [2019-02-18 09:26:05,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2019-02-18 09:26:05,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2019-02-18 09:26:05,621 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 6 [2019-02-18 09:26:05,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:05,622 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2019-02-18 09:26:05,622 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-02-18 09:26:05,622 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2019-02-18 09:26:05,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-02-18 09:26:05,622 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:05,623 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1] [2019-02-18 09:26:05,623 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:05,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:05,623 INFO L82 PathProgramCache]: Analyzing trace with hash 529849760, now seen corresponding path program 2 times [2019-02-18 09:26:05,624 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:05,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:05,625 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:05,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:05,625 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:05,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:05,794 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:05,795 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:05,795 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:05,795 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:05,795 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:05,795 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:05,796 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:05,813 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:26:05,813 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:26:05,865 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-02-18 09:26:05,865 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:05,868 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:05,886 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:05,886 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:05,966 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:05,966 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:06,239 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:06,240 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:06,316 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:06,334 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:06,334 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2019-02-18 09:26:06,334 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:06,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-02-18 09:26:06,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-02-18 09:26:06,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2019-02-18 09:26:06,336 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 8 states. [2019-02-18 09:26:06,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:06,476 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2019-02-18 09:26:06,476 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-02-18 09:26:06,477 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 9 [2019-02-18 09:26:06,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:06,478 INFO L225 Difference]: With dead ends: 15 [2019-02-18 09:26:06,478 INFO L226 Difference]: Without dead ends: 14 [2019-02-18 09:26:06,478 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2019-02-18 09:26:06,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-02-18 09:26:06,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2019-02-18 09:26:06,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-02-18 09:26:06,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-02-18 09:26:06,482 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 9 [2019-02-18 09:26:06,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:06,483 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-02-18 09:26:06,483 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-02-18 09:26:06,483 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-02-18 09:26:06,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-02-18 09:26:06,484 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:06,484 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1] [2019-02-18 09:26:06,484 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:06,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:06,485 INFO L82 PathProgramCache]: Analyzing trace with hash 749428876, now seen corresponding path program 3 times [2019-02-18 09:26:06,486 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:06,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:06,487 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:06,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:06,487 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:06,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:06,611 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:06,611 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:06,611 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:06,612 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:06,612 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:06,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:06,612 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:06,623 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:26:06,623 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:26:06,647 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:26:06,647 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:06,649 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:06,663 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:06,664 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:06,680 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:06,680 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:06,785 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:06,786 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:06,879 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:06,898 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:06,898 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2019-02-18 09:26:06,898 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:06,899 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-02-18 09:26:06,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-02-18 09:26:06,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=97, Unknown=0, NotChecked=0, Total=182 [2019-02-18 09:26:06,900 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 10 states. [2019-02-18 09:26:07,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:07,222 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2019-02-18 09:26:07,223 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-02-18 09:26:07,223 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 12 [2019-02-18 09:26:07,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:07,224 INFO L225 Difference]: With dead ends: 18 [2019-02-18 09:26:07,224 INFO L226 Difference]: Without dead ends: 17 [2019-02-18 09:26:07,225 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=85, Invalid=97, Unknown=0, NotChecked=0, Total=182 [2019-02-18 09:26:07,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-02-18 09:26:07,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2019-02-18 09:26:07,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-02-18 09:26:07,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2019-02-18 09:26:07,229 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 12 [2019-02-18 09:26:07,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:07,230 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2019-02-18 09:26:07,230 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-02-18 09:26:07,230 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2019-02-18 09:26:07,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-02-18 09:26:07,230 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:07,231 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1] [2019-02-18 09:26:07,231 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:07,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:07,231 INFO L82 PathProgramCache]: Analyzing trace with hash 995681824, now seen corresponding path program 4 times [2019-02-18 09:26:07,231 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:07,232 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:07,232 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:07,233 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:07,233 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:07,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:07,459 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:07,459 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:07,459 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:07,460 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:07,460 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:07,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:07,460 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:07,477 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:07,477 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:26:07,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:07,497 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:07,507 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:07,507 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:07,518 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:07,519 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:07,622 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:07,622 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:07,713 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:07,732 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:07,732 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 15 [2019-02-18 09:26:07,733 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:07,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-02-18 09:26:07,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-02-18 09:26:07,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=146, Unknown=0, NotChecked=0, Total=272 [2019-02-18 09:26:07,734 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 12 states. [2019-02-18 09:26:07,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:07,786 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2019-02-18 09:26:07,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-02-18 09:26:07,787 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 15 [2019-02-18 09:26:07,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:07,788 INFO L225 Difference]: With dead ends: 21 [2019-02-18 09:26:07,788 INFO L226 Difference]: Without dead ends: 20 [2019-02-18 09:26:07,789 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=126, Invalid=146, Unknown=0, NotChecked=0, Total=272 [2019-02-18 09:26:07,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-02-18 09:26:07,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2019-02-18 09:26:07,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-02-18 09:26:07,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2019-02-18 09:26:07,794 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 15 [2019-02-18 09:26:07,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:07,794 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2019-02-18 09:26:07,794 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-02-18 09:26:07,794 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2019-02-18 09:26:07,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-02-18 09:26:07,795 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:07,795 INFO L402 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1] [2019-02-18 09:26:07,796 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:07,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:07,796 INFO L82 PathProgramCache]: Analyzing trace with hash 1313114124, now seen corresponding path program 5 times [2019-02-18 09:26:07,796 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:07,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:07,797 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:07,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:07,797 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:07,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:08,000 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:08,000 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:08,001 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:08,001 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:08,001 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:08,001 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:08,001 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:08,010 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:26:08,011 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:26:08,036 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-02-18 09:26:08,036 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:08,039 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:08,047 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:08,047 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:08,060 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:08,060 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:08,198 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:08,199 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:08,367 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:08,385 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:08,385 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 18 [2019-02-18 09:26:08,385 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:08,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-02-18 09:26:08,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-02-18 09:26:08,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=205, Unknown=0, NotChecked=0, Total=380 [2019-02-18 09:26:08,387 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 14 states. [2019-02-18 09:26:08,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:08,441 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2019-02-18 09:26:08,441 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-02-18 09:26:08,441 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 18 [2019-02-18 09:26:08,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:08,442 INFO L225 Difference]: With dead ends: 24 [2019-02-18 09:26:08,442 INFO L226 Difference]: Without dead ends: 23 [2019-02-18 09:26:08,442 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=175, Invalid=205, Unknown=0, NotChecked=0, Total=380 [2019-02-18 09:26:08,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-02-18 09:26:08,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2019-02-18 09:26:08,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-02-18 09:26:08,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2019-02-18 09:26:08,447 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 18 [2019-02-18 09:26:08,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:08,447 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2019-02-18 09:26:08,448 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-02-18 09:26:08,448 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2019-02-18 09:26:08,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-02-18 09:26:08,449 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:08,449 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1] [2019-02-18 09:26:08,449 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:08,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:08,449 INFO L82 PathProgramCache]: Analyzing trace with hash 420777632, now seen corresponding path program 6 times [2019-02-18 09:26:08,450 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:08,450 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:08,450 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:08,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:08,451 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:08,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:08,593 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:08,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:08,593 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:08,593 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:08,594 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:08,594 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:08,594 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:08,608 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:26:08,608 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:26:08,620 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:26:08,620 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:08,622 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:08,630 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:08,631 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:08,641 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:08,642 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:08,771 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:08,771 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:08,864 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:08,883 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:08,883 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 21 [2019-02-18 09:26:08,884 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:08,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-02-18 09:26:08,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-02-18 09:26:08,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=274, Unknown=0, NotChecked=0, Total=506 [2019-02-18 09:26:08,885 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 16 states. [2019-02-18 09:26:08,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:08,947 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2019-02-18 09:26:08,948 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-02-18 09:26:08,948 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 21 [2019-02-18 09:26:08,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:08,949 INFO L225 Difference]: With dead ends: 27 [2019-02-18 09:26:08,950 INFO L226 Difference]: Without dead ends: 26 [2019-02-18 09:26:08,951 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=232, Invalid=274, Unknown=0, NotChecked=0, Total=506 [2019-02-18 09:26:08,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-02-18 09:26:08,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2019-02-18 09:26:08,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-02-18 09:26:08,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2019-02-18 09:26:08,955 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 21 [2019-02-18 09:26:08,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:08,955 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2019-02-18 09:26:08,956 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-02-18 09:26:08,956 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2019-02-18 09:26:08,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-02-18 09:26:08,956 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:08,956 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1] [2019-02-18 09:26:08,957 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:08,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:08,957 INFO L82 PathProgramCache]: Analyzing trace with hash -1623060596, now seen corresponding path program 7 times [2019-02-18 09:26:08,957 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:08,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:08,958 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:08,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:08,958 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:08,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:09,225 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:09,225 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:09,225 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:09,225 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:09,226 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:09,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:09,226 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:09,237 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:09,237 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:26:09,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:09,251 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:09,261 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:09,262 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:09,274 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:09,275 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:09,497 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:09,498 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:09,658 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:09,677 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:09,677 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 24 [2019-02-18 09:26:09,677 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:09,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-02-18 09:26:09,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-02-18 09:26:09,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=353, Unknown=0, NotChecked=0, Total=650 [2019-02-18 09:26:09,679 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 18 states. [2019-02-18 09:26:09,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:09,862 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2019-02-18 09:26:09,862 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-02-18 09:26:09,862 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 24 [2019-02-18 09:26:09,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:09,864 INFO L225 Difference]: With dead ends: 30 [2019-02-18 09:26:09,864 INFO L226 Difference]: Without dead ends: 29 [2019-02-18 09:26:09,866 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=297, Invalid=353, Unknown=0, NotChecked=0, Total=650 [2019-02-18 09:26:09,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-02-18 09:26:09,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2019-02-18 09:26:09,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-02-18 09:26:09,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2019-02-18 09:26:09,870 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 24 [2019-02-18 09:26:09,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:09,870 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2019-02-18 09:26:09,870 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-02-18 09:26:09,871 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2019-02-18 09:26:09,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-02-18 09:26:09,871 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:09,872 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1] [2019-02-18 09:26:09,872 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:09,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:09,872 INFO L82 PathProgramCache]: Analyzing trace with hash 143644448, now seen corresponding path program 8 times [2019-02-18 09:26:09,872 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:09,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:09,873 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:09,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:09,873 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:09,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:10,029 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:10,030 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:10,030 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:10,030 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:10,030 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:10,030 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:10,030 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:10,053 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:26:10,053 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:26:10,080 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-02-18 09:26:10,080 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:10,082 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:10,091 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:10,092 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:10,113 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:10,114 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:10,247 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:10,247 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:10,425 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:10,444 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:10,445 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 27 [2019-02-18 09:26:10,445 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:10,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-02-18 09:26:10,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-02-18 09:26:10,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=442, Unknown=0, NotChecked=0, Total=812 [2019-02-18 09:26:10,447 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2019-02-18 09:26:10,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:10,604 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2019-02-18 09:26:10,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-02-18 09:26:10,605 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2019-02-18 09:26:10,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:10,606 INFO L225 Difference]: With dead ends: 33 [2019-02-18 09:26:10,606 INFO L226 Difference]: Without dead ends: 32 [2019-02-18 09:26:10,607 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=370, Invalid=442, Unknown=0, NotChecked=0, Total=812 [2019-02-18 09:26:10,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-02-18 09:26:10,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2019-02-18 09:26:10,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-02-18 09:26:10,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2019-02-18 09:26:10,611 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 27 [2019-02-18 09:26:10,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:10,612 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2019-02-18 09:26:10,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-02-18 09:26:10,612 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2019-02-18 09:26:10,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-02-18 09:26:10,613 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:10,613 INFO L402 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1] [2019-02-18 09:26:10,613 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:10,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:10,614 INFO L82 PathProgramCache]: Analyzing trace with hash 1524365068, now seen corresponding path program 9 times [2019-02-18 09:26:10,614 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:10,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:10,615 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:10,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:10,615 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:10,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:10,793 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:10,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:10,793 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:10,794 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:10,794 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:10,794 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:10,794 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:10,802 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:26:10,803 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:26:10,815 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:26:10,815 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:10,818 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:10,821 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:10,821 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:10,861 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:10,862 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:11,302 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:11,303 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:11,767 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:11,787 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:11,787 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 30 [2019-02-18 09:26:11,787 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:11,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-02-18 09:26:11,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-02-18 09:26:11,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=541, Unknown=0, NotChecked=0, Total=992 [2019-02-18 09:26:11,790 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 22 states. [2019-02-18 09:26:11,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:11,863 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2019-02-18 09:26:11,863 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-02-18 09:26:11,864 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 30 [2019-02-18 09:26:11,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:11,865 INFO L225 Difference]: With dead ends: 36 [2019-02-18 09:26:11,865 INFO L226 Difference]: Without dead ends: 35 [2019-02-18 09:26:11,866 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=451, Invalid=541, Unknown=0, NotChecked=0, Total=992 [2019-02-18 09:26:11,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-02-18 09:26:11,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2019-02-18 09:26:11,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-02-18 09:26:11,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2019-02-18 09:26:11,872 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 30 [2019-02-18 09:26:11,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:11,872 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2019-02-18 09:26:11,872 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-02-18 09:26:11,872 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2019-02-18 09:26:11,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-02-18 09:26:11,873 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:11,873 INFO L402 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1] [2019-02-18 09:26:11,874 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:11,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:11,874 INFO L82 PathProgramCache]: Analyzing trace with hash 1670561696, now seen corresponding path program 10 times [2019-02-18 09:26:11,874 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:11,875 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:11,875 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:11,875 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:11,875 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:11,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:12,291 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:12,291 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:12,291 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:12,291 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:12,291 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:12,292 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:12,292 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:12,300 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:12,300 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:26:12,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:12,327 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:12,344 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:12,345 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:12,427 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:12,428 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:12,679 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:12,680 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:12,883 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:12,901 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:12,901 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 33 [2019-02-18 09:26:12,901 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:12,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-02-18 09:26:12,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-02-18 09:26:12,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=650, Unknown=0, NotChecked=0, Total=1190 [2019-02-18 09:26:12,903 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 24 states. [2019-02-18 09:26:12,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:12,992 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2019-02-18 09:26:12,994 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-02-18 09:26:12,994 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 33 [2019-02-18 09:26:12,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:12,994 INFO L225 Difference]: With dead ends: 39 [2019-02-18 09:26:12,995 INFO L226 Difference]: Without dead ends: 38 [2019-02-18 09:26:12,995 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=540, Invalid=650, Unknown=0, NotChecked=0, Total=1190 [2019-02-18 09:26:12,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-02-18 09:26:12,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2019-02-18 09:26:12,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-02-18 09:26:13,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2019-02-18 09:26:13,000 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 33 [2019-02-18 09:26:13,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:13,001 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2019-02-18 09:26:13,001 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-02-18 09:26:13,001 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2019-02-18 09:26:13,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-02-18 09:26:13,002 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:13,002 INFO L402 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1] [2019-02-18 09:26:13,002 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:13,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:13,003 INFO L82 PathProgramCache]: Analyzing trace with hash 1917468300, now seen corresponding path program 11 times [2019-02-18 09:26:13,003 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:13,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:13,004 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:13,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:13,004 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:13,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:13,246 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:13,246 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:13,247 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:13,247 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:13,247 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:13,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:13,247 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:13,257 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:26:13,258 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:26:13,338 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-02-18 09:26:13,338 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:13,341 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:13,356 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:13,356 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:13,366 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:13,366 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:13,661 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:13,661 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:13,879 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:13,898 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:13,898 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 36 [2019-02-18 09:26:13,898 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:13,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-02-18 09:26:13,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-02-18 09:26:13,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=637, Invalid=769, Unknown=0, NotChecked=0, Total=1406 [2019-02-18 09:26:13,900 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 26 states. [2019-02-18 09:26:13,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:13,983 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2019-02-18 09:26:13,983 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-02-18 09:26:13,983 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 36 [2019-02-18 09:26:13,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:13,984 INFO L225 Difference]: With dead ends: 42 [2019-02-18 09:26:13,985 INFO L226 Difference]: Without dead ends: 41 [2019-02-18 09:26:13,986 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=637, Invalid=769, Unknown=0, NotChecked=0, Total=1406 [2019-02-18 09:26:13,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-02-18 09:26:13,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2019-02-18 09:26:13,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-02-18 09:26:13,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2019-02-18 09:26:13,991 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 36 [2019-02-18 09:26:13,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:13,991 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2019-02-18 09:26:13,991 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-02-18 09:26:13,991 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2019-02-18 09:26:13,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-02-18 09:26:13,992 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:13,992 INFO L402 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1] [2019-02-18 09:26:13,992 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:13,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:13,993 INFO L82 PathProgramCache]: Analyzing trace with hash 233130016, now seen corresponding path program 12 times [2019-02-18 09:26:13,993 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:13,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:13,994 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:13,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:13,994 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:14,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:14,258 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:14,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:14,258 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:14,258 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:14,259 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:14,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:14,259 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:14,267 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:26:14,267 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:26:14,286 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:26:14,286 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:14,290 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:14,298 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:14,298 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:14,307 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:14,307 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:14,634 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:14,634 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:14,962 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:14,981 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:14,981 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 39 [2019-02-18 09:26:14,981 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:14,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-02-18 09:26:14,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-02-18 09:26:14,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=742, Invalid=898, Unknown=0, NotChecked=0, Total=1640 [2019-02-18 09:26:14,983 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 28 states. [2019-02-18 09:26:15,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:15,073 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2019-02-18 09:26:15,073 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-02-18 09:26:15,074 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 39 [2019-02-18 09:26:15,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:15,075 INFO L225 Difference]: With dead ends: 45 [2019-02-18 09:26:15,075 INFO L226 Difference]: Without dead ends: 44 [2019-02-18 09:26:15,077 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 650 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=742, Invalid=898, Unknown=0, NotChecked=0, Total=1640 [2019-02-18 09:26:15,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-02-18 09:26:15,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2019-02-18 09:26:15,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-02-18 09:26:15,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2019-02-18 09:26:15,081 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 39 [2019-02-18 09:26:15,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:15,081 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2019-02-18 09:26:15,082 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-02-18 09:26:15,082 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2019-02-18 09:26:15,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-02-18 09:26:15,082 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:15,083 INFO L402 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1] [2019-02-18 09:26:15,083 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:15,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:15,083 INFO L82 PathProgramCache]: Analyzing trace with hash 214230540, now seen corresponding path program 13 times [2019-02-18 09:26:15,083 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:15,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:15,084 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:15,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:15,084 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:15,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:15,360 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:15,360 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:15,360 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:15,360 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:15,360 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:15,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:15,361 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:15,370 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:15,370 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:26:15,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:15,387 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:15,394 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:15,394 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:15,404 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:15,404 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:15,718 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:15,718 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:16,572 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:16,591 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:16,591 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 42 [2019-02-18 09:26:16,591 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:16,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-02-18 09:26:16,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-02-18 09:26:16,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=855, Invalid=1037, Unknown=0, NotChecked=0, Total=1892 [2019-02-18 09:26:16,592 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 30 states. [2019-02-18 09:26:16,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:16,725 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2019-02-18 09:26:16,725 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-02-18 09:26:16,726 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 42 [2019-02-18 09:26:16,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:16,727 INFO L225 Difference]: With dead ends: 48 [2019-02-18 09:26:16,727 INFO L226 Difference]: Without dead ends: 47 [2019-02-18 09:26:16,729 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 756 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=855, Invalid=1037, Unknown=0, NotChecked=0, Total=1892 [2019-02-18 09:26:16,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-02-18 09:26:16,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2019-02-18 09:26:16,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-02-18 09:26:16,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2019-02-18 09:26:16,733 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 42 [2019-02-18 09:26:16,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:16,734 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2019-02-18 09:26:16,734 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-02-18 09:26:16,734 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2019-02-18 09:26:16,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-02-18 09:26:16,735 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:16,735 INFO L402 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1] [2019-02-18 09:26:16,735 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:16,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:16,736 INFO L82 PathProgramCache]: Analyzing trace with hash -179343200, now seen corresponding path program 14 times [2019-02-18 09:26:16,736 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:16,736 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:16,737 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:16,737 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:16,737 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:16,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:17,083 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:17,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:17,084 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:17,084 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:17,084 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:17,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:17,084 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:17,099 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:26:17,100 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:26:17,134 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2019-02-18 09:26:17,134 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:17,137 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:17,143 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:17,144 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:17,156 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:17,157 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:18,103 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:18,103 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:18,471 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:18,489 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:18,490 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 45 [2019-02-18 09:26:18,490 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:18,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-02-18 09:26:18,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-02-18 09:26:18,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=976, Invalid=1186, Unknown=0, NotChecked=0, Total=2162 [2019-02-18 09:26:18,492 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 32 states. [2019-02-18 09:26:18,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:18,769 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2019-02-18 09:26:18,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-02-18 09:26:18,770 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 45 [2019-02-18 09:26:18,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:18,770 INFO L225 Difference]: With dead ends: 51 [2019-02-18 09:26:18,771 INFO L226 Difference]: Without dead ends: 50 [2019-02-18 09:26:18,772 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 870 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=976, Invalid=1186, Unknown=0, NotChecked=0, Total=2162 [2019-02-18 09:26:18,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-02-18 09:26:18,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2019-02-18 09:26:18,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-02-18 09:26:18,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2019-02-18 09:26:18,780 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 45 [2019-02-18 09:26:18,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:18,784 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2019-02-18 09:26:18,784 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-02-18 09:26:18,784 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2019-02-18 09:26:18,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-02-18 09:26:18,785 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:18,785 INFO L402 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1] [2019-02-18 09:26:18,786 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:18,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:18,786 INFO L82 PathProgramCache]: Analyzing trace with hash 126086540, now seen corresponding path program 15 times [2019-02-18 09:26:18,786 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:18,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:18,789 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:18,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:18,789 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:18,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:19,660 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:19,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:19,661 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:19,661 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:19,661 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:19,661 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:19,661 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:19,670 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:26:19,671 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:26:19,687 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:26:19,688 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:19,691 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:19,701 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:19,702 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:19,706 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:19,706 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:19,930 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:19,930 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:20,275 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:20,293 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:20,294 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 48 [2019-02-18 09:26:20,294 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:20,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-02-18 09:26:20,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-02-18 09:26:20,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1105, Invalid=1345, Unknown=0, NotChecked=0, Total=2450 [2019-02-18 09:26:20,295 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 34 states. [2019-02-18 09:26:20,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:20,399 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2019-02-18 09:26:20,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-02-18 09:26:20,400 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 48 [2019-02-18 09:26:20,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:20,401 INFO L225 Difference]: With dead ends: 54 [2019-02-18 09:26:20,401 INFO L226 Difference]: Without dead ends: 53 [2019-02-18 09:26:20,402 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1105, Invalid=1345, Unknown=0, NotChecked=0, Total=2450 [2019-02-18 09:26:20,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-02-18 09:26:20,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2019-02-18 09:26:20,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-02-18 09:26:20,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2019-02-18 09:26:20,408 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 48 [2019-02-18 09:26:20,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:20,408 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2019-02-18 09:26:20,408 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-02-18 09:26:20,408 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2019-02-18 09:26:20,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-02-18 09:26:20,409 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:20,409 INFO L402 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1] [2019-02-18 09:26:20,409 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:20,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:20,410 INFO L82 PathProgramCache]: Analyzing trace with hash -1852229344, now seen corresponding path program 16 times [2019-02-18 09:26:20,410 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:20,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:20,411 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:20,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:20,411 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:20,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:20,641 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:20,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:20,641 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:20,641 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:20,641 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:20,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:20,642 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:20,650 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:20,650 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:26:20,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:20,671 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:20,684 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:20,684 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:20,690 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:20,691 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:21,513 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:21,514 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:22,616 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:22,635 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:22,635 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 51 [2019-02-18 09:26:22,635 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:22,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-02-18 09:26:22,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-02-18 09:26:22,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1242, Invalid=1514, Unknown=0, NotChecked=0, Total=2756 [2019-02-18 09:26:22,637 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 36 states. [2019-02-18 09:26:22,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:22,763 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2019-02-18 09:26:22,764 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-02-18 09:26:22,764 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 51 [2019-02-18 09:26:22,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:22,765 INFO L225 Difference]: With dead ends: 57 [2019-02-18 09:26:22,765 INFO L226 Difference]: Without dead ends: 56 [2019-02-18 09:26:22,767 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1122 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1242, Invalid=1514, Unknown=0, NotChecked=0, Total=2756 [2019-02-18 09:26:22,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-02-18 09:26:22,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2019-02-18 09:26:22,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-02-18 09:26:22,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2019-02-18 09:26:22,772 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 51 [2019-02-18 09:26:22,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:22,773 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2019-02-18 09:26:22,773 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-02-18 09:26:22,773 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2019-02-18 09:26:22,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-02-18 09:26:22,776 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:22,776 INFO L402 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1] [2019-02-18 09:26:22,777 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:22,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:22,777 INFO L82 PathProgramCache]: Analyzing trace with hash 1975473420, now seen corresponding path program 17 times [2019-02-18 09:26:22,777 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:22,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:22,778 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:22,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:22,778 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:22,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:23,429 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:23,429 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:23,429 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:23,429 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:23,429 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:23,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:23,430 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:23,438 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:26:23,438 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:26:23,479 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2019-02-18 09:26:23,479 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:23,482 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:23,487 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:23,488 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:23,495 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:23,496 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:23,734 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:23,734 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:24,178 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:24,197 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:24,197 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 54 [2019-02-18 09:26:24,197 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:24,198 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-02-18 09:26:24,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-02-18 09:26:24,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1387, Invalid=1693, Unknown=0, NotChecked=0, Total=3080 [2019-02-18 09:26:24,199 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 38 states. [2019-02-18 09:26:24,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:24,320 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2019-02-18 09:26:24,320 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-02-18 09:26:24,320 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 54 [2019-02-18 09:26:24,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:24,321 INFO L225 Difference]: With dead ends: 60 [2019-02-18 09:26:24,321 INFO L226 Difference]: Without dead ends: 59 [2019-02-18 09:26:24,323 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1260 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1387, Invalid=1693, Unknown=0, NotChecked=0, Total=3080 [2019-02-18 09:26:24,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-02-18 09:26:24,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2019-02-18 09:26:24,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-02-18 09:26:24,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2019-02-18 09:26:24,328 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 54 [2019-02-18 09:26:24,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:24,329 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2019-02-18 09:26:24,329 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-02-18 09:26:24,329 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2019-02-18 09:26:24,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-02-18 09:26:24,330 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:24,330 INFO L402 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1] [2019-02-18 09:26:24,330 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:24,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:24,330 INFO L82 PathProgramCache]: Analyzing trace with hash 1686806944, now seen corresponding path program 18 times [2019-02-18 09:26:24,331 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:24,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:24,331 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:24,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:24,332 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:24,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:24,878 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:24,878 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:24,878 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:24,878 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:24,878 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:24,879 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:24,879 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:24,887 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:26:24,887 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:26:24,908 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:26:24,908 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:24,912 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:24,934 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:24,934 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:24,947 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:24,948 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:25,214 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:25,214 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:25,882 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:25,901 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:25,901 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 57 [2019-02-18 09:26:25,901 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:25,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2019-02-18 09:26:25,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2019-02-18 09:26:25,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1540, Invalid=1882, Unknown=0, NotChecked=0, Total=3422 [2019-02-18 09:26:25,903 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 40 states. [2019-02-18 09:26:26,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:26,018 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2019-02-18 09:26:26,018 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-02-18 09:26:26,018 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 57 [2019-02-18 09:26:26,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:26,019 INFO L225 Difference]: With dead ends: 63 [2019-02-18 09:26:26,020 INFO L226 Difference]: Without dead ends: 62 [2019-02-18 09:26:26,021 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1406 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1540, Invalid=1882, Unknown=0, NotChecked=0, Total=3422 [2019-02-18 09:26:26,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-02-18 09:26:26,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2019-02-18 09:26:26,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-02-18 09:26:26,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2019-02-18 09:26:26,026 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 57 [2019-02-18 09:26:26,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:26,026 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2019-02-18 09:26:26,026 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2019-02-18 09:26:26,026 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2019-02-18 09:26:26,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-02-18 09:26:26,027 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:26,027 INFO L402 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1] [2019-02-18 09:26:26,027 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:26,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:26,028 INFO L82 PathProgramCache]: Analyzing trace with hash 548347020, now seen corresponding path program 19 times [2019-02-18 09:26:26,028 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:26,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:26,029 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:26,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:26,029 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:26,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:26,337 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:26,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:26,337 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:26,337 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:26,338 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:26,338 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:26,338 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:26,347 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:26,347 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:26:26,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:26,370 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:26,379 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:26,379 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:26,383 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:26,383 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:26,861 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:26,862 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:27,367 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:27,386 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:27,386 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 60 [2019-02-18 09:26:27,386 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:27,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2019-02-18 09:26:27,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2019-02-18 09:26:27,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1701, Invalid=2081, Unknown=0, NotChecked=0, Total=3782 [2019-02-18 09:26:27,391 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 42 states. [2019-02-18 09:26:27,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:27,539 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2019-02-18 09:26:27,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-02-18 09:26:27,539 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 60 [2019-02-18 09:26:27,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:27,540 INFO L225 Difference]: With dead ends: 66 [2019-02-18 09:26:27,540 INFO L226 Difference]: Without dead ends: 65 [2019-02-18 09:26:27,542 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1560 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1701, Invalid=2081, Unknown=0, NotChecked=0, Total=3782 [2019-02-18 09:26:27,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2019-02-18 09:26:27,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2019-02-18 09:26:27,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-02-18 09:26:27,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 64 transitions. [2019-02-18 09:26:27,545 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 64 transitions. Word has length 60 [2019-02-18 09:26:27,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:27,545 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 64 transitions. [2019-02-18 09:26:27,546 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2019-02-18 09:26:27,546 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 64 transitions. [2019-02-18 09:26:27,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-02-18 09:26:27,546 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:27,546 INFO L402 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1] [2019-02-18 09:26:27,547 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:27,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:27,547 INFO L82 PathProgramCache]: Analyzing trace with hash 2045487648, now seen corresponding path program 20 times [2019-02-18 09:26:27,547 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:27,548 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:27,548 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:27,548 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:27,548 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:27,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:28,044 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:28,044 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:28,044 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:28,044 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:28,044 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:28,044 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:28,044 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:28,053 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:26:28,053 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:26:28,091 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2019-02-18 09:26:28,091 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:28,095 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:28,113 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:28,114 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:28,120 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:28,121 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:28,517 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:28,518 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:29,267 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:29,286 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:29,286 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 63 [2019-02-18 09:26:29,286 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:29,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-02-18 09:26:29,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-02-18 09:26:29,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1870, Invalid=2290, Unknown=0, NotChecked=0, Total=4160 [2019-02-18 09:26:29,288 INFO L87 Difference]: Start difference. First operand 64 states and 64 transitions. Second operand 44 states. [2019-02-18 09:26:29,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:29,467 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2019-02-18 09:26:29,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-02-18 09:26:29,468 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 63 [2019-02-18 09:26:29,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:29,469 INFO L225 Difference]: With dead ends: 69 [2019-02-18 09:26:29,469 INFO L226 Difference]: Without dead ends: 68 [2019-02-18 09:26:29,471 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1722 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1870, Invalid=2290, Unknown=0, NotChecked=0, Total=4160 [2019-02-18 09:26:29,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-02-18 09:26:29,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2019-02-18 09:26:29,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-02-18 09:26:29,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2019-02-18 09:26:29,476 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 63 [2019-02-18 09:26:29,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:29,476 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2019-02-18 09:26:29,477 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-02-18 09:26:29,477 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2019-02-18 09:26:29,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2019-02-18 09:26:29,478 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:29,478 INFO L402 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1] [2019-02-18 09:26:29,478 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:29,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:29,478 INFO L82 PathProgramCache]: Analyzing trace with hash 126567436, now seen corresponding path program 21 times [2019-02-18 09:26:29,478 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:29,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:29,479 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:29,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:29,479 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:29,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:30,189 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:30,190 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:30,190 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:30,190 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:30,190 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:30,190 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:30,190 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:30,199 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:26:30,199 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:26:30,219 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:26:30,219 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:30,223 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:30,229 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:30,229 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:30,241 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:30,241 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:30,596 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:30,597 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:31,248 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:31,268 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:31,269 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 66 [2019-02-18 09:26:31,269 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:31,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2019-02-18 09:26:31,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2019-02-18 09:26:31,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2047, Invalid=2509, Unknown=0, NotChecked=0, Total=4556 [2019-02-18 09:26:31,270 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 46 states. [2019-02-18 09:26:31,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:31,414 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2019-02-18 09:26:31,417 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-02-18 09:26:31,417 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 66 [2019-02-18 09:26:31,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:31,418 INFO L225 Difference]: With dead ends: 72 [2019-02-18 09:26:31,418 INFO L226 Difference]: Without dead ends: 71 [2019-02-18 09:26:31,418 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1892 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2047, Invalid=2509, Unknown=0, NotChecked=0, Total=4556 [2019-02-18 09:26:31,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2019-02-18 09:26:31,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2019-02-18 09:26:31,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-02-18 09:26:31,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2019-02-18 09:26:31,421 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 66 [2019-02-18 09:26:31,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:31,421 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2019-02-18 09:26:31,422 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2019-02-18 09:26:31,422 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2019-02-18 09:26:31,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-02-18 09:26:31,422 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:31,422 INFO L402 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1] [2019-02-18 09:26:31,422 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:31,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:31,423 INFO L82 PathProgramCache]: Analyzing trace with hash -410758496, now seen corresponding path program 22 times [2019-02-18 09:26:31,423 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:31,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:31,423 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:31,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:31,423 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:31,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:31,793 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:31,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:31,793 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:31,793 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:31,793 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:31,794 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:31,794 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:31,803 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:31,803 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:26:31,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:31,837 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:31,844 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:31,844 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:31,852 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:31,852 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:32,240 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:32,241 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:33,030 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:33,048 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:33,049 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 69 [2019-02-18 09:26:33,049 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:33,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2019-02-18 09:26:33,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2019-02-18 09:26:33,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2232, Invalid=2738, Unknown=0, NotChecked=0, Total=4970 [2019-02-18 09:26:33,052 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 48 states. [2019-02-18 09:26:33,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:33,233 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2019-02-18 09:26:33,234 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-02-18 09:26:33,234 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 69 [2019-02-18 09:26:33,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:33,235 INFO L225 Difference]: With dead ends: 75 [2019-02-18 09:26:33,235 INFO L226 Difference]: Without dead ends: 74 [2019-02-18 09:26:33,236 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2070 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2232, Invalid=2738, Unknown=0, NotChecked=0, Total=4970 [2019-02-18 09:26:33,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-02-18 09:26:33,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2019-02-18 09:26:33,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-02-18 09:26:33,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2019-02-18 09:26:33,241 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 69 [2019-02-18 09:26:33,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:33,241 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2019-02-18 09:26:33,241 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2019-02-18 09:26:33,241 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2019-02-18 09:26:33,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-02-18 09:26:33,242 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:33,242 INFO L402 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1] [2019-02-18 09:26:33,242 INFO L423 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:33,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:33,243 INFO L82 PathProgramCache]: Analyzing trace with hash -544486516, now seen corresponding path program 23 times [2019-02-18 09:26:33,243 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:33,243 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:33,244 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:33,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:33,244 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:33,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:33,649 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:33,650 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:33,650 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:33,650 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:33,650 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:33,650 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:33,650 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:33,658 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:26:33,659 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:26:33,704 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2019-02-18 09:26:33,704 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:33,707 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:33,709 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:33,710 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:33,726 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:33,726 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:34,126 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:34,127 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:35,169 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:35,188 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:35,188 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 72 [2019-02-18 09:26:35,188 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:35,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2019-02-18 09:26:35,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2019-02-18 09:26:35,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2019-02-18 09:26:35,190 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 50 states. [2019-02-18 09:26:35,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:35,334 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2019-02-18 09:26:35,346 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-02-18 09:26:35,346 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 72 [2019-02-18 09:26:35,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:35,347 INFO L225 Difference]: With dead ends: 78 [2019-02-18 09:26:35,347 INFO L226 Difference]: Without dead ends: 77 [2019-02-18 09:26:35,348 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2256 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2019-02-18 09:26:35,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2019-02-18 09:26:35,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2019-02-18 09:26:35,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-02-18 09:26:35,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 76 transitions. [2019-02-18 09:26:35,353 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 76 transitions. Word has length 72 [2019-02-18 09:26:35,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:35,353 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 76 transitions. [2019-02-18 09:26:35,353 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2019-02-18 09:26:35,353 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 76 transitions. [2019-02-18 09:26:35,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-02-18 09:26:35,354 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:35,354 INFO L402 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1] [2019-02-18 09:26:35,354 INFO L423 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:35,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:35,355 INFO L82 PathProgramCache]: Analyzing trace with hash 1293720352, now seen corresponding path program 24 times [2019-02-18 09:26:35,355 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:35,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:35,356 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:35,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:35,357 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:35,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:35,762 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:35,762 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:35,762 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:35,762 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:35,763 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:35,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:35,763 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:35,771 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:26:35,772 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:26:35,794 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:26:35,794 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:35,798 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:35,802 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:35,802 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:35,810 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:35,811 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:36,258 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:36,259 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:37,059 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:37,078 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:37,078 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 75 [2019-02-18 09:26:37,078 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:37,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2019-02-18 09:26:37,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2019-02-18 09:26:37,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=3226, Unknown=0, NotChecked=0, Total=5852 [2019-02-18 09:26:37,080 INFO L87 Difference]: Start difference. First operand 76 states and 76 transitions. Second operand 52 states. [2019-02-18 09:26:37,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:37,270 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2019-02-18 09:26:37,270 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-02-18 09:26:37,270 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 75 [2019-02-18 09:26:37,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:37,271 INFO L225 Difference]: With dead ends: 81 [2019-02-18 09:26:37,271 INFO L226 Difference]: Without dead ends: 80 [2019-02-18 09:26:37,272 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2450 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2626, Invalid=3226, Unknown=0, NotChecked=0, Total=5852 [2019-02-18 09:26:37,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2019-02-18 09:26:37,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2019-02-18 09:26:37,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2019-02-18 09:26:37,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2019-02-18 09:26:37,277 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 75 [2019-02-18 09:26:37,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:37,277 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2019-02-18 09:26:37,277 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2019-02-18 09:26:37,277 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2019-02-18 09:26:37,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-02-18 09:26:37,278 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:37,278 INFO L402 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1] [2019-02-18 09:26:37,278 INFO L423 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:37,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:37,278 INFO L82 PathProgramCache]: Analyzing trace with hash -1813466356, now seen corresponding path program 25 times [2019-02-18 09:26:37,279 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:37,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:37,279 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:37,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:37,280 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:37,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:37,837 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:37,837 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:37,837 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:37,838 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:37,838 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:37,838 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:37,838 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:37,847 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:37,847 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:26:37,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:37,873 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:37,876 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:37,876 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:37,886 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:37,886 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:38,344 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:38,344 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:39,259 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:39,278 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:39,278 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 78 [2019-02-18 09:26:39,278 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:39,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2019-02-18 09:26:39,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2019-02-18 09:26:39,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2835, Invalid=3485, Unknown=0, NotChecked=0, Total=6320 [2019-02-18 09:26:39,280 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 54 states. [2019-02-18 09:26:39,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:39,500 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2019-02-18 09:26:39,500 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-02-18 09:26:39,501 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 78 [2019-02-18 09:26:39,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:39,502 INFO L225 Difference]: With dead ends: 84 [2019-02-18 09:26:39,502 INFO L226 Difference]: Without dead ends: 83 [2019-02-18 09:26:39,503 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2652 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2835, Invalid=3485, Unknown=0, NotChecked=0, Total=6320 [2019-02-18 09:26:39,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2019-02-18 09:26:39,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2019-02-18 09:26:39,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-02-18 09:26:39,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 82 transitions. [2019-02-18 09:26:39,506 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 82 transitions. Word has length 78 [2019-02-18 09:26:39,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:39,507 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 82 transitions. [2019-02-18 09:26:39,507 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2019-02-18 09:26:39,507 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 82 transitions. [2019-02-18 09:26:39,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2019-02-18 09:26:39,508 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:39,508 INFO L402 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1] [2019-02-18 09:26:39,508 INFO L423 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:39,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:39,509 INFO L82 PathProgramCache]: Analyzing trace with hash 1417446304, now seen corresponding path program 26 times [2019-02-18 09:26:39,509 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:39,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:39,510 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:39,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:39,510 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:39,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:40,255 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:40,255 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:40,255 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:40,255 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:40,256 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:40,256 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:40,256 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:40,264 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:26:40,264 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:26:40,324 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2019-02-18 09:26:40,325 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:40,328 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:40,334 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:40,335 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:40,343 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:40,343 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:41,043 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:41,044 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:41,991 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:42,011 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:42,011 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 81 [2019-02-18 09:26:42,011 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:42,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2019-02-18 09:26:42,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2019-02-18 09:26:42,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3052, Invalid=3754, Unknown=0, NotChecked=0, Total=6806 [2019-02-18 09:26:42,013 INFO L87 Difference]: Start difference. First operand 82 states and 82 transitions. Second operand 56 states. [2019-02-18 09:26:42,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:42,169 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2019-02-18 09:26:42,169 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-02-18 09:26:42,170 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 81 [2019-02-18 09:26:42,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:42,171 INFO L225 Difference]: With dead ends: 87 [2019-02-18 09:26:42,171 INFO L226 Difference]: Without dead ends: 86 [2019-02-18 09:26:42,172 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2862 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=3052, Invalid=3754, Unknown=0, NotChecked=0, Total=6806 [2019-02-18 09:26:42,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2019-02-18 09:26:42,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2019-02-18 09:26:42,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2019-02-18 09:26:42,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2019-02-18 09:26:42,176 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 81 [2019-02-18 09:26:42,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:42,176 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2019-02-18 09:26:42,176 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2019-02-18 09:26:42,176 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2019-02-18 09:26:42,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-02-18 09:26:42,177 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:42,177 INFO L402 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1] [2019-02-18 09:26:42,177 INFO L423 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:42,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:42,177 INFO L82 PathProgramCache]: Analyzing trace with hash -975570292, now seen corresponding path program 27 times [2019-02-18 09:26:42,177 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:42,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:42,178 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:42,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:42,178 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:42,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:42,816 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:42,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:42,816 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:42,817 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:42,817 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:42,817 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:42,817 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:42,826 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:26:42,827 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:26:42,859 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:26:42,860 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:42,863 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:42,869 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:42,869 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:42,877 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:42,878 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:43,395 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:43,395 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:44,436 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:44,454 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:44,455 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 84 [2019-02-18 09:26:44,455 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:44,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2019-02-18 09:26:44,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2019-02-18 09:26:44,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3277, Invalid=4033, Unknown=0, NotChecked=0, Total=7310 [2019-02-18 09:26:44,456 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 58 states. [2019-02-18 09:26:44,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:44,631 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2019-02-18 09:26:44,632 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-02-18 09:26:44,632 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 84 [2019-02-18 09:26:44,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:44,633 INFO L225 Difference]: With dead ends: 90 [2019-02-18 09:26:44,633 INFO L226 Difference]: Without dead ends: 89 [2019-02-18 09:26:44,634 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3080 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3277, Invalid=4033, Unknown=0, NotChecked=0, Total=7310 [2019-02-18 09:26:44,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-02-18 09:26:44,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2019-02-18 09:26:44,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-02-18 09:26:44,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 88 transitions. [2019-02-18 09:26:44,637 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 88 transitions. Word has length 84 [2019-02-18 09:26:44,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:44,638 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 88 transitions. [2019-02-18 09:26:44,638 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2019-02-18 09:26:44,638 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 88 transitions. [2019-02-18 09:26:44,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-02-18 09:26:44,638 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:44,638 INFO L402 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1] [2019-02-18 09:26:44,639 INFO L423 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:44,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:44,639 INFO L82 PathProgramCache]: Analyzing trace with hash 829164576, now seen corresponding path program 28 times [2019-02-18 09:26:44,639 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:44,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:44,640 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:44,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:44,640 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:44,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:45,584 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:45,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:45,584 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:45,584 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:45,584 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:45,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:45,584 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:45,593 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:45,593 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:26:45,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:45,621 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:45,646 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:45,647 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:45,659 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:45,659 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:46,414 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:46,415 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:47,440 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:47,458 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:47,459 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 87 [2019-02-18 09:26:47,459 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:47,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2019-02-18 09:26:47,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2019-02-18 09:26:47,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3510, Invalid=4322, Unknown=0, NotChecked=0, Total=7832 [2019-02-18 09:26:47,460 INFO L87 Difference]: Start difference. First operand 88 states and 88 transitions. Second operand 60 states. [2019-02-18 09:26:47,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:47,683 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2019-02-18 09:26:47,683 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-02-18 09:26:47,683 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 87 [2019-02-18 09:26:47,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:47,685 INFO L225 Difference]: With dead ends: 93 [2019-02-18 09:26:47,685 INFO L226 Difference]: Without dead ends: 92 [2019-02-18 09:26:47,686 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3306 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3510, Invalid=4322, Unknown=0, NotChecked=0, Total=7832 [2019-02-18 09:26:47,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2019-02-18 09:26:47,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2019-02-18 09:26:47,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2019-02-18 09:26:47,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2019-02-18 09:26:47,690 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 87 [2019-02-18 09:26:47,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:47,690 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2019-02-18 09:26:47,690 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2019-02-18 09:26:47,690 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2019-02-18 09:26:47,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2019-02-18 09:26:47,691 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:47,691 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1] [2019-02-18 09:26:47,691 INFO L423 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:47,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:47,692 INFO L82 PathProgramCache]: Analyzing trace with hash 1285005836, now seen corresponding path program 29 times [2019-02-18 09:26:47,692 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:47,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:47,692 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:47,693 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:47,693 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:47,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:48,266 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:48,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:48,266 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:48,267 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:48,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:48,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:48,267 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:48,282 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:26:48,282 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:26:48,348 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2019-02-18 09:26:48,348 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:48,352 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:48,355 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:48,355 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:48,366 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:48,366 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:48,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:48,992 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:50,297 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:50,317 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:50,317 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 90 [2019-02-18 09:26:50,317 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:50,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2019-02-18 09:26:50,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2019-02-18 09:26:50,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3751, Invalid=4621, Unknown=0, NotChecked=0, Total=8372 [2019-02-18 09:26:50,319 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 62 states. [2019-02-18 09:26:50,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:50,530 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2019-02-18 09:26:50,530 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-02-18 09:26:50,530 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 90 [2019-02-18 09:26:50,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:50,531 INFO L225 Difference]: With dead ends: 96 [2019-02-18 09:26:50,531 INFO L226 Difference]: Without dead ends: 95 [2019-02-18 09:26:50,532 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3540 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=3751, Invalid=4621, Unknown=0, NotChecked=0, Total=8372 [2019-02-18 09:26:50,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2019-02-18 09:26:50,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2019-02-18 09:26:50,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2019-02-18 09:26:50,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 94 transitions. [2019-02-18 09:26:50,536 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 94 transitions. Word has length 90 [2019-02-18 09:26:50,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:50,537 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 94 transitions. [2019-02-18 09:26:50,537 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2019-02-18 09:26:50,537 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 94 transitions. [2019-02-18 09:26:50,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-02-18 09:26:50,537 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:50,537 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1] [2019-02-18 09:26:50,537 INFO L423 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:50,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:50,538 INFO L82 PathProgramCache]: Analyzing trace with hash 565392544, now seen corresponding path program 30 times [2019-02-18 09:26:50,538 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:50,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:50,538 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:50,539 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:50,539 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:50,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:51,104 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:51,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:51,105 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:51,105 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:51,105 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:51,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:51,105 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:51,116 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:26:51,116 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:26:51,148 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:26:51,148 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:51,152 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:51,155 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:51,156 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:51,171 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:51,172 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:51,810 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:51,810 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:53,013 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:53,032 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:53,032 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 93 [2019-02-18 09:26:53,032 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:53,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2019-02-18 09:26:53,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2019-02-18 09:26:53,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4000, Invalid=4930, Unknown=0, NotChecked=0, Total=8930 [2019-02-18 09:26:53,034 INFO L87 Difference]: Start difference. First operand 94 states and 94 transitions. Second operand 64 states. [2019-02-18 09:26:53,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:53,229 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2019-02-18 09:26:53,230 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-02-18 09:26:53,230 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 93 [2019-02-18 09:26:53,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:53,231 INFO L225 Difference]: With dead ends: 99 [2019-02-18 09:26:53,231 INFO L226 Difference]: Without dead ends: 98 [2019-02-18 09:26:53,232 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3782 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=4000, Invalid=4930, Unknown=0, NotChecked=0, Total=8930 [2019-02-18 09:26:53,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2019-02-18 09:26:53,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2019-02-18 09:26:53,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2019-02-18 09:26:53,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2019-02-18 09:26:53,236 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 93 [2019-02-18 09:26:53,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:53,236 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2019-02-18 09:26:53,236 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2019-02-18 09:26:53,236 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2019-02-18 09:26:53,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2019-02-18 09:26:53,237 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:53,237 INFO L402 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1] [2019-02-18 09:26:53,237 INFO L423 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:53,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:53,238 INFO L82 PathProgramCache]: Analyzing trace with hash -1252415092, now seen corresponding path program 31 times [2019-02-18 09:26:53,238 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:53,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:53,238 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:53,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:53,239 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:53,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:53,962 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:53,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:53,962 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:53,962 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:53,962 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:53,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:53,963 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:53,971 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:53,972 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:26:53,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:54,002 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:54,019 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:54,019 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:54,037 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:54,038 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:54,740 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:54,740 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:56,232 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:56,249 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:56,250 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 96 [2019-02-18 09:26:56,250 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:56,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2019-02-18 09:26:56,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2019-02-18 09:26:56,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4257, Invalid=5249, Unknown=0, NotChecked=0, Total=9506 [2019-02-18 09:26:56,251 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 66 states. [2019-02-18 09:26:56,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:56,460 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2019-02-18 09:26:56,460 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-02-18 09:26:56,460 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 96 [2019-02-18 09:26:56,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:56,461 INFO L225 Difference]: With dead ends: 102 [2019-02-18 09:26:56,461 INFO L226 Difference]: Without dead ends: 101 [2019-02-18 09:26:56,462 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4032 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=4257, Invalid=5249, Unknown=0, NotChecked=0, Total=9506 [2019-02-18 09:26:56,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2019-02-18 09:26:56,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2019-02-18 09:26:56,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2019-02-18 09:26:56,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 100 transitions. [2019-02-18 09:26:56,467 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 100 transitions. Word has length 96 [2019-02-18 09:26:56,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:56,467 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 100 transitions. [2019-02-18 09:26:56,467 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2019-02-18 09:26:56,467 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 100 transitions. [2019-02-18 09:26:56,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2019-02-18 09:26:56,468 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:56,468 INFO L402 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1] [2019-02-18 09:26:56,468 INFO L423 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:56,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:56,468 INFO L82 PathProgramCache]: Analyzing trace with hash -317063904, now seen corresponding path program 32 times [2019-02-18 09:26:56,469 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:56,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:56,469 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:26:56,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:56,470 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:56,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:26:57,082 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:57,082 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:57,083 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:26:57,083 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:26:57,083 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:26:57,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:26:57,083 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:26:57,092 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:26:57,092 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:26:57,165 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2019-02-18 09:26:57,165 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:26:57,169 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:26:57,180 INFO L478 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 6 treesize of output 5 [2019-02-18 09:26:57,181 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:26:57,192 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:26:57,192 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:26:58,095 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:58,096 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:26:59,469 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:26:59,487 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:26:59,488 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 99 [2019-02-18 09:26:59,488 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:26:59,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2019-02-18 09:26:59,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2019-02-18 09:26:59,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4522, Invalid=5578, Unknown=0, NotChecked=0, Total=10100 [2019-02-18 09:26:59,489 INFO L87 Difference]: Start difference. First operand 100 states and 100 transitions. Second operand 68 states. [2019-02-18 09:26:59,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:26:59,731 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2019-02-18 09:26:59,731 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-02-18 09:26:59,731 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 99 [2019-02-18 09:26:59,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:26:59,732 INFO L225 Difference]: With dead ends: 105 [2019-02-18 09:26:59,732 INFO L226 Difference]: Without dead ends: 104 [2019-02-18 09:26:59,733 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4290 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=4522, Invalid=5578, Unknown=0, NotChecked=0, Total=10100 [2019-02-18 09:26:59,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2019-02-18 09:26:59,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2019-02-18 09:26:59,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2019-02-18 09:26:59,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2019-02-18 09:26:59,738 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 99 [2019-02-18 09:26:59,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:26:59,738 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2019-02-18 09:26:59,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2019-02-18 09:26:59,738 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2019-02-18 09:26:59,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2019-02-18 09:26:59,739 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:26:59,739 INFO L402 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1] [2019-02-18 09:26:59,739 INFO L423 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:26:59,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:26:59,739 INFO L82 PathProgramCache]: Analyzing trace with hash -1017638644, now seen corresponding path program 33 times [2019-02-18 09:26:59,740 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:26:59,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:59,740 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:26:59,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:26:59,741 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:26:59,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:27:00,689 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:00,689 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:00,690 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:27:00,690 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:27:00,690 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:27:00,690 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:00,690 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:27:00,698 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:27:00,698 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:27:00,733 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:27:00,733 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:27:00,737 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:27:00,754 INFO L478 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 6 treesize of output 5 [2019-02-18 09:27:00,755 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:27:00,834 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:27:00,835 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:27:01,680 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:01,681 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:27:03,145 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:03,163 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:27:03,164 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 102 [2019-02-18 09:27:03,164 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:27:03,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2019-02-18 09:27:03,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2019-02-18 09:27:03,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4795, Invalid=5917, Unknown=0, NotChecked=0, Total=10712 [2019-02-18 09:27:03,166 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 70 states. [2019-02-18 09:27:03,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:27:03,472 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2019-02-18 09:27:03,472 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-02-18 09:27:03,472 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 102 [2019-02-18 09:27:03,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:27:03,473 INFO L225 Difference]: With dead ends: 108 [2019-02-18 09:27:03,474 INFO L226 Difference]: Without dead ends: 107 [2019-02-18 09:27:03,475 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4556 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=4795, Invalid=5917, Unknown=0, NotChecked=0, Total=10712 [2019-02-18 09:27:03,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2019-02-18 09:27:03,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2019-02-18 09:27:03,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2019-02-18 09:27:03,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 106 transitions. [2019-02-18 09:27:03,479 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 106 transitions. Word has length 102 [2019-02-18 09:27:03,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:27:03,479 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 106 transitions. [2019-02-18 09:27:03,479 INFO L481 AbstractCegarLoop]: Interpolant automaton has 70 states. [2019-02-18 09:27:03,479 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 106 transitions. [2019-02-18 09:27:03,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2019-02-18 09:27:03,480 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:27:03,480 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1] [2019-02-18 09:27:03,480 INFO L423 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:27:03,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:27:03,481 INFO L82 PathProgramCache]: Analyzing trace with hash 1701340576, now seen corresponding path program 34 times [2019-02-18 09:27:03,481 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:27:03,481 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:03,482 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:27:03,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:03,482 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:27:03,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:27:04,178 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:04,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:04,178 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:27:04,178 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:27:04,178 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:27:04,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:04,178 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:27:04,187 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:27:04,187 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:27:04,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:27:04,220 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:27:04,222 INFO L478 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 6 treesize of output 5 [2019-02-18 09:27:04,222 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:27:04,235 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:27:04,235 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:27:04,995 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:04,995 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:27:06,777 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:06,795 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:27:06,795 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 105 [2019-02-18 09:27:06,795 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:27:06,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 72 states [2019-02-18 09:27:06,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2019-02-18 09:27:06,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5076, Invalid=6266, Unknown=0, NotChecked=0, Total=11342 [2019-02-18 09:27:06,797 INFO L87 Difference]: Start difference. First operand 106 states and 106 transitions. Second operand 72 states. [2019-02-18 09:27:06,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:27:07,000 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2019-02-18 09:27:07,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2019-02-18 09:27:07,000 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 105 [2019-02-18 09:27:07,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:27:07,001 INFO L225 Difference]: With dead ends: 111 [2019-02-18 09:27:07,001 INFO L226 Difference]: Without dead ends: 110 [2019-02-18 09:27:07,002 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4830 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=5076, Invalid=6266, Unknown=0, NotChecked=0, Total=11342 [2019-02-18 09:27:07,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2019-02-18 09:27:07,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2019-02-18 09:27:07,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2019-02-18 09:27:07,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2019-02-18 09:27:07,007 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 105 [2019-02-18 09:27:07,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:27:07,007 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2019-02-18 09:27:07,007 INFO L481 AbstractCegarLoop]: Interpolant automaton has 72 states. [2019-02-18 09:27:07,007 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2019-02-18 09:27:07,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2019-02-18 09:27:07,008 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:27:07,008 INFO L402 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1] [2019-02-18 09:27:07,008 INFO L423 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:27:07,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:27:07,009 INFO L82 PathProgramCache]: Analyzing trace with hash -271918964, now seen corresponding path program 35 times [2019-02-18 09:27:07,009 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:27:07,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:07,009 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:27:07,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:07,010 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:27:07,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:27:08,135 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:08,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:08,135 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:27:08,135 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:27:08,135 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:27:08,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:08,135 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:27:08,145 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:27:08,145 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:27:08,240 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2019-02-18 09:27:08,241 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:27:08,244 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:27:08,247 INFO L478 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 6 treesize of output 5 [2019-02-18 09:27:08,247 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:27:08,257 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:27:08,257 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:27:09,084 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:09,085 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:27:10,896 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:10,923 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:27:10,924 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 108 [2019-02-18 09:27:10,924 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:27:10,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2019-02-18 09:27:10,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2019-02-18 09:27:10,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5365, Invalid=6625, Unknown=0, NotChecked=0, Total=11990 [2019-02-18 09:27:10,925 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 74 states. [2019-02-18 09:27:11,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:27:11,329 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2019-02-18 09:27:11,329 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-02-18 09:27:11,329 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 108 [2019-02-18 09:27:11,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:27:11,330 INFO L225 Difference]: With dead ends: 114 [2019-02-18 09:27:11,330 INFO L226 Difference]: Without dead ends: 113 [2019-02-18 09:27:11,331 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5112 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=5365, Invalid=6625, Unknown=0, NotChecked=0, Total=11990 [2019-02-18 09:27:11,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2019-02-18 09:27:11,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 112. [2019-02-18 09:27:11,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2019-02-18 09:27:11,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 112 transitions. [2019-02-18 09:27:11,336 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 112 transitions. Word has length 108 [2019-02-18 09:27:11,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:27:11,336 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 112 transitions. [2019-02-18 09:27:11,336 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2019-02-18 09:27:11,336 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 112 transitions. [2019-02-18 09:27:11,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2019-02-18 09:27:11,337 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:27:11,337 INFO L402 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1] [2019-02-18 09:27:11,337 INFO L423 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:27:11,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:27:11,338 INFO L82 PathProgramCache]: Analyzing trace with hash -429494752, now seen corresponding path program 36 times [2019-02-18 09:27:11,338 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:27:11,338 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:11,339 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:27:11,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:11,339 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:27:11,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:27:12,062 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:12,062 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:12,062 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:27:12,062 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:27:12,062 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:27:12,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:12,063 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:27:12,072 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:27:12,072 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:27:12,105 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:27:12,106 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:27:12,109 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:27:12,116 INFO L478 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 6 treesize of output 5 [2019-02-18 09:27:12,116 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:27:12,128 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:27:12,128 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:27:13,080 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:13,081 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:27:14,784 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:14,802 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:27:14,803 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 111 [2019-02-18 09:27:14,803 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:27:14,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 76 states [2019-02-18 09:27:14,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2019-02-18 09:27:14,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5662, Invalid=6994, Unknown=0, NotChecked=0, Total=12656 [2019-02-18 09:27:14,805 INFO L87 Difference]: Start difference. First operand 112 states and 112 transitions. Second operand 76 states. [2019-02-18 09:27:15,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:27:15,039 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2019-02-18 09:27:15,039 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-02-18 09:27:15,040 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 111 [2019-02-18 09:27:15,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:27:15,041 INFO L225 Difference]: With dead ends: 117 [2019-02-18 09:27:15,041 INFO L226 Difference]: Without dead ends: 116 [2019-02-18 09:27:15,042 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5402 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=5662, Invalid=6994, Unknown=0, NotChecked=0, Total=12656 [2019-02-18 09:27:15,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2019-02-18 09:27:15,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2019-02-18 09:27:15,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2019-02-18 09:27:15,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2019-02-18 09:27:15,046 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 111 [2019-02-18 09:27:15,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:27:15,046 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2019-02-18 09:27:15,046 INFO L481 AbstractCegarLoop]: Interpolant automaton has 76 states. [2019-02-18 09:27:15,047 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2019-02-18 09:27:15,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2019-02-18 09:27:15,047 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:27:15,047 INFO L402 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1] [2019-02-18 09:27:15,048 INFO L423 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:27:15,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:27:15,048 INFO L82 PathProgramCache]: Analyzing trace with hash -370540532, now seen corresponding path program 37 times [2019-02-18 09:27:15,048 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:27:15,049 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:15,049 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:27:15,049 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:15,049 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:27:15,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:27:16,073 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:16,074 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:16,074 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:27:16,074 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:27:16,074 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:27:16,074 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:16,074 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:27:16,083 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:27:16,083 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:27:16,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:27:16,131 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:27:16,151 INFO L478 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 6 treesize of output 5 [2019-02-18 09:27:16,152 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:27:16,204 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:27:16,204 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:27:17,186 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:17,186 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:27:19,016 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:19,034 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:27:19,034 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 114 [2019-02-18 09:27:19,034 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:27:19,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 78 states [2019-02-18 09:27:19,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2019-02-18 09:27:19,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5967, Invalid=7373, Unknown=0, NotChecked=0, Total=13340 [2019-02-18 09:27:19,036 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 78 states. [2019-02-18 09:27:19,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:27:19,334 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2019-02-18 09:27:19,335 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2019-02-18 09:27:19,335 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 114 [2019-02-18 09:27:19,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:27:19,336 INFO L225 Difference]: With dead ends: 120 [2019-02-18 09:27:19,336 INFO L226 Difference]: Without dead ends: 119 [2019-02-18 09:27:19,337 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5700 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=5967, Invalid=7373, Unknown=0, NotChecked=0, Total=13340 [2019-02-18 09:27:19,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2019-02-18 09:27:19,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2019-02-18 09:27:19,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2019-02-18 09:27:19,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 118 transitions. [2019-02-18 09:27:19,340 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 118 transitions. Word has length 114 [2019-02-18 09:27:19,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:27:19,341 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 118 transitions. [2019-02-18 09:27:19,341 INFO L481 AbstractCegarLoop]: Interpolant automaton has 78 states. [2019-02-18 09:27:19,341 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 118 transitions. [2019-02-18 09:27:19,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2019-02-18 09:27:19,341 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:27:19,341 INFO L402 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1] [2019-02-18 09:27:19,342 INFO L423 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:27:19,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:27:19,342 INFO L82 PathProgramCache]: Analyzing trace with hash -706996576, now seen corresponding path program 38 times [2019-02-18 09:27:19,342 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:27:19,342 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:19,343 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:27:19,343 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:19,343 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:27:19,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:27:20,136 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:20,136 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:20,136 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:27:20,137 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:27:20,137 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:27:20,137 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:20,137 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:27:20,145 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:27:20,145 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:27:20,243 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2019-02-18 09:27:20,244 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:27:20,248 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:27:20,250 INFO L478 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 6 treesize of output 5 [2019-02-18 09:27:20,250 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:27:20,265 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:27:20,265 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:27:21,677 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:21,677 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:27:23,665 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:23,684 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:27:23,685 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 117 [2019-02-18 09:27:23,685 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:27:23,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2019-02-18 09:27:23,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2019-02-18 09:27:23,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6280, Invalid=7762, Unknown=0, NotChecked=0, Total=14042 [2019-02-18 09:27:23,686 INFO L87 Difference]: Start difference. First operand 118 states and 118 transitions. Second operand 80 states. [2019-02-18 09:27:23,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:27:23,995 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2019-02-18 09:27:23,995 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2019-02-18 09:27:23,996 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 117 [2019-02-18 09:27:23,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:27:23,997 INFO L225 Difference]: With dead ends: 123 [2019-02-18 09:27:23,997 INFO L226 Difference]: Without dead ends: 122 [2019-02-18 09:27:23,998 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6006 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=6280, Invalid=7762, Unknown=0, NotChecked=0, Total=14042 [2019-02-18 09:27:23,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2019-02-18 09:27:24,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2019-02-18 09:27:24,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2019-02-18 09:27:24,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2019-02-18 09:27:24,002 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 117 [2019-02-18 09:27:24,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:27:24,002 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2019-02-18 09:27:24,002 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2019-02-18 09:27:24,002 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2019-02-18 09:27:24,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2019-02-18 09:27:24,003 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:27:24,003 INFO L402 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1] [2019-02-18 09:27:24,003 INFO L423 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:27:24,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:27:24,003 INFO L82 PathProgramCache]: Analyzing trace with hash 384665484, now seen corresponding path program 39 times [2019-02-18 09:27:24,003 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:27:24,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:24,004 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:27:24,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:24,004 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:27:24,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:27:25,381 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:25,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:25,381 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:27:25,381 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:27:25,381 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:27:25,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:25,382 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:27:25,389 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:27:25,389 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:27:25,428 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:27:25,428 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:27:25,433 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:27:25,449 INFO L478 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 6 treesize of output 5 [2019-02-18 09:27:25,450 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:27:25,548 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:27:25,548 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:27:27,149 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:27,150 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:27:29,093 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:29,122 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:27:29,122 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 120 [2019-02-18 09:27:29,122 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:27:29,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 82 states [2019-02-18 09:27:29,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2019-02-18 09:27:29,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6601, Invalid=8161, Unknown=0, NotChecked=0, Total=14762 [2019-02-18 09:27:29,124 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand 82 states. [2019-02-18 09:27:29,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:27:29,429 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2019-02-18 09:27:29,429 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-02-18 09:27:29,430 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 120 [2019-02-18 09:27:29,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:27:29,431 INFO L225 Difference]: With dead ends: 126 [2019-02-18 09:27:29,431 INFO L226 Difference]: Without dead ends: 125 [2019-02-18 09:27:29,432 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6320 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=6601, Invalid=8161, Unknown=0, NotChecked=0, Total=14762 [2019-02-18 09:27:29,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2019-02-18 09:27:29,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2019-02-18 09:27:29,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2019-02-18 09:27:29,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 124 transitions. [2019-02-18 09:27:29,435 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 124 transitions. Word has length 120 [2019-02-18 09:27:29,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:27:29,435 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 124 transitions. [2019-02-18 09:27:29,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has 82 states. [2019-02-18 09:27:29,435 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 124 transitions. [2019-02-18 09:27:29,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2019-02-18 09:27:29,436 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:27:29,436 INFO L402 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1] [2019-02-18 09:27:29,436 INFO L423 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:27:29,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:27:29,436 INFO L82 PathProgramCache]: Analyzing trace with hash 596729632, now seen corresponding path program 40 times [2019-02-18 09:27:29,436 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:27:29,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:29,437 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:27:29,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:29,437 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:27:29,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:27:31,022 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:31,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:31,023 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:27:31,023 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:27:31,023 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:27:31,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:31,023 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:27:31,032 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:27:31,032 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:27:31,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:27:31,074 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:27:31,080 INFO L478 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 6 treesize of output 5 [2019-02-18 09:27:31,080 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:27:31,089 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:27:31,089 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:27:32,179 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:32,179 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:27:34,207 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:34,235 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:27:34,235 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 123 [2019-02-18 09:27:34,236 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:27:34,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 84 states [2019-02-18 09:27:34,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2019-02-18 09:27:34,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6930, Invalid=8570, Unknown=0, NotChecked=0, Total=15500 [2019-02-18 09:27:34,238 INFO L87 Difference]: Start difference. First operand 124 states and 124 transitions. Second operand 84 states. [2019-02-18 09:27:34,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:27:34,641 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2019-02-18 09:27:34,641 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2019-02-18 09:27:34,641 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 123 [2019-02-18 09:27:34,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:27:34,642 INFO L225 Difference]: With dead ends: 129 [2019-02-18 09:27:34,642 INFO L226 Difference]: Without dead ends: 128 [2019-02-18 09:27:34,643 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6642 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=6930, Invalid=8570, Unknown=0, NotChecked=0, Total=15500 [2019-02-18 09:27:34,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2019-02-18 09:27:34,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2019-02-18 09:27:34,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2019-02-18 09:27:34,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2019-02-18 09:27:34,648 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 123 [2019-02-18 09:27:34,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:27:34,648 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2019-02-18 09:27:34,649 INFO L481 AbstractCegarLoop]: Interpolant automaton has 84 states. [2019-02-18 09:27:34,649 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2019-02-18 09:27:34,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2019-02-18 09:27:34,649 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:27:34,649 INFO L402 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1] [2019-02-18 09:27:34,650 INFO L423 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:27:34,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:27:34,650 INFO L82 PathProgramCache]: Analyzing trace with hash 302870284, now seen corresponding path program 41 times [2019-02-18 09:27:34,650 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:27:34,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:34,651 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:27:34,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:34,651 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:27:34,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:27:37,368 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:37,368 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:37,368 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:27:37,368 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:27:37,368 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:27:37,368 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:37,368 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:27:37,376 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:27:37,376 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:27:37,494 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2019-02-18 09:27:37,495 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:27:37,499 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:27:37,512 INFO L478 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 6 treesize of output 5 [2019-02-18 09:27:37,512 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:27:37,524 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:27:37,524 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:27:38,593 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:38,593 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:27:40,827 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:40,847 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:27:40,847 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 126 [2019-02-18 09:27:40,847 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:27:40,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2019-02-18 09:27:40,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2019-02-18 09:27:40,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7267, Invalid=8989, Unknown=0, NotChecked=0, Total=16256 [2019-02-18 09:27:40,849 INFO L87 Difference]: Start difference. First operand 127 states and 127 transitions. Second operand 86 states. [2019-02-18 09:27:41,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:27:41,722 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2019-02-18 09:27:41,723 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-02-18 09:27:41,723 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 126 [2019-02-18 09:27:41,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:27:41,725 INFO L225 Difference]: With dead ends: 132 [2019-02-18 09:27:41,725 INFO L226 Difference]: Without dead ends: 131 [2019-02-18 09:27:41,726 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6972 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=7267, Invalid=8989, Unknown=0, NotChecked=0, Total=16256 [2019-02-18 09:27:41,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2019-02-18 09:27:41,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 130. [2019-02-18 09:27:41,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2019-02-18 09:27:41,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 130 transitions. [2019-02-18 09:27:41,730 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 130 transitions. Word has length 126 [2019-02-18 09:27:41,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:27:41,731 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 130 transitions. [2019-02-18 09:27:41,731 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2019-02-18 09:27:41,731 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 130 transitions. [2019-02-18 09:27:41,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2019-02-18 09:27:41,732 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:27:41,732 INFO L402 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1] [2019-02-18 09:27:41,732 INFO L423 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:27:41,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:27:41,732 INFO L82 PathProgramCache]: Analyzing trace with hash -917616736, now seen corresponding path program 42 times [2019-02-18 09:27:41,732 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:27:41,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:41,733 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:27:41,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:41,733 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:27:41,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:27:42,768 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:42,768 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:42,768 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:27:42,768 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:27:42,768 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:27:42,768 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:42,768 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:27:42,776 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:27:42,777 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:27:42,817 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:27:42,818 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:27:42,823 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:27:42,825 INFO L478 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 6 treesize of output 5 [2019-02-18 09:27:42,825 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:27:42,839 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:27:42,840 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:27:44,051 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:44,052 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:27:46,329 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:46,350 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:27:46,350 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 129 [2019-02-18 09:27:46,350 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:27:46,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 88 states [2019-02-18 09:27:46,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2019-02-18 09:27:46,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7612, Invalid=9418, Unknown=0, NotChecked=0, Total=17030 [2019-02-18 09:27:46,353 INFO L87 Difference]: Start difference. First operand 130 states and 130 transitions. Second operand 88 states. [2019-02-18 09:27:46,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:27:46,874 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2019-02-18 09:27:46,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2019-02-18 09:27:46,874 INFO L78 Accepts]: Start accepts. Automaton has 88 states. Word has length 129 [2019-02-18 09:27:46,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:27:46,876 INFO L225 Difference]: With dead ends: 135 [2019-02-18 09:27:46,876 INFO L226 Difference]: Without dead ends: 134 [2019-02-18 09:27:46,877 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7310 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=7612, Invalid=9418, Unknown=0, NotChecked=0, Total=17030 [2019-02-18 09:27:46,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2019-02-18 09:27:46,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2019-02-18 09:27:46,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2019-02-18 09:27:46,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 133 transitions. [2019-02-18 09:27:46,882 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 133 transitions. Word has length 129 [2019-02-18 09:27:46,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:27:46,883 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 133 transitions. [2019-02-18 09:27:46,883 INFO L481 AbstractCegarLoop]: Interpolant automaton has 88 states. [2019-02-18 09:27:46,883 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 133 transitions. [2019-02-18 09:27:46,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2019-02-18 09:27:46,884 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:27:46,884 INFO L402 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1] [2019-02-18 09:27:46,884 INFO L423 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:27:46,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:27:46,884 INFO L82 PathProgramCache]: Analyzing trace with hash 746698380, now seen corresponding path program 43 times [2019-02-18 09:27:46,884 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:27:46,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:46,896 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:27:46,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:46,896 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:27:46,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:27:48,238 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:48,238 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:48,238 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:27:48,239 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:27:48,239 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:27:48,239 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:48,239 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:27:48,248 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:27:48,248 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:27:48,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:27:48,289 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:27:48,292 INFO L478 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 6 treesize of output 5 [2019-02-18 09:27:48,293 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:27:48,302 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:27:48,302 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:27:49,483 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:49,483 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:27:52,128 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:52,149 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:27:52,149 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 132 [2019-02-18 09:27:52,149 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:27:52,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 90 states [2019-02-18 09:27:52,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2019-02-18 09:27:52,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7965, Invalid=9857, Unknown=0, NotChecked=0, Total=17822 [2019-02-18 09:27:52,151 INFO L87 Difference]: Start difference. First operand 133 states and 133 transitions. Second operand 90 states. [2019-02-18 09:27:52,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:27:52,402 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2019-02-18 09:27:52,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-02-18 09:27:52,403 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 132 [2019-02-18 09:27:52,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:27:52,404 INFO L225 Difference]: With dead ends: 138 [2019-02-18 09:27:52,404 INFO L226 Difference]: Without dead ends: 137 [2019-02-18 09:27:52,405 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7656 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=7965, Invalid=9857, Unknown=0, NotChecked=0, Total=17822 [2019-02-18 09:27:52,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2019-02-18 09:27:52,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2019-02-18 09:27:52,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2019-02-18 09:27:52,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 136 transitions. [2019-02-18 09:27:52,410 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 136 transitions. Word has length 132 [2019-02-18 09:27:52,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:27:52,411 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 136 transitions. [2019-02-18 09:27:52,411 INFO L481 AbstractCegarLoop]: Interpolant automaton has 90 states. [2019-02-18 09:27:52,411 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 136 transitions. [2019-02-18 09:27:52,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2019-02-18 09:27:52,411 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:27:52,412 INFO L402 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1] [2019-02-18 09:27:52,412 INFO L423 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:27:52,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:27:52,412 INFO L82 PathProgramCache]: Analyzing trace with hash 1255854112, now seen corresponding path program 44 times [2019-02-18 09:27:52,412 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:27:52,413 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:52,413 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:27:52,413 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:52,413 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:27:52,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:27:54,110 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:54,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:54,110 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:27:54,110 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:27:54,110 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:27:54,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:54,110 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:27:54,129 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:27:54,130 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:27:54,255 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2019-02-18 09:27:54,255 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:27:54,260 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:27:54,266 INFO L478 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 6 treesize of output 5 [2019-02-18 09:27:54,266 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:27:54,275 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:27:54,275 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:27:55,521 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:55,521 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:27:58,139 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:58,158 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:27:58,158 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 135 [2019-02-18 09:27:58,158 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:27:58,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2019-02-18 09:27:58,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2019-02-18 09:27:58,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8326, Invalid=10306, Unknown=0, NotChecked=0, Total=18632 [2019-02-18 09:27:58,160 INFO L87 Difference]: Start difference. First operand 136 states and 136 transitions. Second operand 92 states. [2019-02-18 09:27:58,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:27:58,424 INFO L93 Difference]: Finished difference Result 141 states and 141 transitions. [2019-02-18 09:27:58,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-02-18 09:27:58,425 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 135 [2019-02-18 09:27:58,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:27:58,426 INFO L225 Difference]: With dead ends: 141 [2019-02-18 09:27:58,426 INFO L226 Difference]: Without dead ends: 140 [2019-02-18 09:27:58,427 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8010 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=8326, Invalid=10306, Unknown=0, NotChecked=0, Total=18632 [2019-02-18 09:27:58,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2019-02-18 09:27:58,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2019-02-18 09:27:58,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2019-02-18 09:27:58,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 139 transitions. [2019-02-18 09:27:58,433 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 139 transitions. Word has length 135 [2019-02-18 09:27:58,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:27:58,433 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 139 transitions. [2019-02-18 09:27:58,433 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2019-02-18 09:27:58,433 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 139 transitions. [2019-02-18 09:27:58,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2019-02-18 09:27:58,434 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:27:58,434 INFO L402 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1] [2019-02-18 09:27:58,434 INFO L423 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:27:58,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:27:58,435 INFO L82 PathProgramCache]: Analyzing trace with hash -310223348, now seen corresponding path program 45 times [2019-02-18 09:27:58,435 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:27:58,435 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:58,436 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:27:58,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:27:58,436 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:27:58,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:27:59,701 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:27:59,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:59,701 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:27:59,701 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:27:59,701 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:27:59,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:27:59,702 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:27:59,712 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:27:59,713 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:27:59,757 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:27:59,757 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:27:59,762 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:27:59,778 INFO L478 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 6 treesize of output 5 [2019-02-18 09:27:59,778 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:27:59,835 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:27:59,835 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:28:01,073 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:01,073 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:28:03,886 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:03,904 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:28:03,904 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 138 [2019-02-18 09:28:03,905 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:28:03,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 94 states [2019-02-18 09:28:03,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2019-02-18 09:28:03,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8695, Invalid=10765, Unknown=0, NotChecked=0, Total=19460 [2019-02-18 09:28:03,906 INFO L87 Difference]: Start difference. First operand 139 states and 139 transitions. Second operand 94 states. [2019-02-18 09:28:04,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:28:04,216 INFO L93 Difference]: Finished difference Result 144 states and 144 transitions. [2019-02-18 09:28:04,216 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2019-02-18 09:28:04,216 INFO L78 Accepts]: Start accepts. Automaton has 94 states. Word has length 138 [2019-02-18 09:28:04,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:28:04,218 INFO L225 Difference]: With dead ends: 144 [2019-02-18 09:28:04,218 INFO L226 Difference]: Without dead ends: 143 [2019-02-18 09:28:04,219 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8372 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=8695, Invalid=10765, Unknown=0, NotChecked=0, Total=19460 [2019-02-18 09:28:04,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2019-02-18 09:28:04,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 142. [2019-02-18 09:28:04,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2019-02-18 09:28:04,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 142 transitions. [2019-02-18 09:28:04,224 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 142 transitions. Word has length 138 [2019-02-18 09:28:04,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:28:04,224 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 142 transitions. [2019-02-18 09:28:04,224 INFO L481 AbstractCegarLoop]: Interpolant automaton has 94 states. [2019-02-18 09:28:04,224 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 142 transitions. [2019-02-18 09:28:04,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2019-02-18 09:28:04,225 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:28:04,225 INFO L402 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1] [2019-02-18 09:28:04,225 INFO L423 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:28:04,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:28:04,226 INFO L82 PathProgramCache]: Analyzing trace with hash 905902240, now seen corresponding path program 46 times [2019-02-18 09:28:04,226 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:28:04,226 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:28:04,226 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:28:04,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:28:04,227 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:28:04,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:28:06,149 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:06,150 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:28:06,150 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:28:06,150 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:28:06,150 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:28:06,150 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:28:06,150 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:28:06,160 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:28:06,160 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:28:06,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:28:06,206 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:28:06,210 INFO L478 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 6 treesize of output 5 [2019-02-18 09:28:06,210 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:28:06,219 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:28:06,219 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:28:07,801 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:07,802 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:28:10,773 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:10,792 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:28:10,792 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 141 [2019-02-18 09:28:10,792 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:28:10,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2019-02-18 09:28:10,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2019-02-18 09:28:10,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9072, Invalid=11234, Unknown=0, NotChecked=0, Total=20306 [2019-02-18 09:28:10,794 INFO L87 Difference]: Start difference. First operand 142 states and 142 transitions. Second operand 96 states. [2019-02-18 09:28:11,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:28:11,140 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2019-02-18 09:28:11,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2019-02-18 09:28:11,140 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 141 [2019-02-18 09:28:11,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:28:11,142 INFO L225 Difference]: With dead ends: 147 [2019-02-18 09:28:11,142 INFO L226 Difference]: Without dead ends: 146 [2019-02-18 09:28:11,143 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8742 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=9072, Invalid=11234, Unknown=0, NotChecked=0, Total=20306 [2019-02-18 09:28:11,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2019-02-18 09:28:11,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2019-02-18 09:28:11,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2019-02-18 09:28:11,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 145 transitions. [2019-02-18 09:28:11,148 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 145 transitions. Word has length 141 [2019-02-18 09:28:11,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:28:11,148 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 145 transitions. [2019-02-18 09:28:11,148 INFO L481 AbstractCegarLoop]: Interpolant automaton has 96 states. [2019-02-18 09:28:11,148 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 145 transitions. [2019-02-18 09:28:11,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2019-02-18 09:28:11,149 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:28:11,149 INFO L402 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1] [2019-02-18 09:28:11,149 INFO L423 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:28:11,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:28:11,150 INFO L82 PathProgramCache]: Analyzing trace with hash -1840814708, now seen corresponding path program 47 times [2019-02-18 09:28:11,150 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:28:11,150 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:28:11,150 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:28:11,151 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:28:11,151 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:28:11,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:28:12,831 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:12,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:28:12,831 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:28:12,831 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:28:12,831 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:28:12,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:28:12,832 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:28:12,841 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:28:12,841 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:28:12,979 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2019-02-18 09:28:12,979 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:28:12,984 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:28:13,001 INFO L478 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 6 treesize of output 5 [2019-02-18 09:28:13,001 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:28:13,088 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:28:13,088 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:28:14,540 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:14,540 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:28:17,612 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:17,630 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:28:17,631 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 144 [2019-02-18 09:28:17,631 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:28:17,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2019-02-18 09:28:17,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2019-02-18 09:28:17,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9457, Invalid=11713, Unknown=0, NotChecked=0, Total=21170 [2019-02-18 09:28:17,633 INFO L87 Difference]: Start difference. First operand 145 states and 145 transitions. Second operand 98 states. [2019-02-18 09:28:17,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:28:17,972 INFO L93 Difference]: Finished difference Result 150 states and 150 transitions. [2019-02-18 09:28:17,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2019-02-18 09:28:17,972 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 144 [2019-02-18 09:28:17,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:28:17,973 INFO L225 Difference]: With dead ends: 150 [2019-02-18 09:28:17,973 INFO L226 Difference]: Without dead ends: 149 [2019-02-18 09:28:17,975 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9120 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=9457, Invalid=11713, Unknown=0, NotChecked=0, Total=21170 [2019-02-18 09:28:17,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2019-02-18 09:28:17,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 148. [2019-02-18 09:28:17,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2019-02-18 09:28:17,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 148 transitions. [2019-02-18 09:28:17,979 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 148 transitions. Word has length 144 [2019-02-18 09:28:17,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:28:17,979 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 148 transitions. [2019-02-18 09:28:17,979 INFO L481 AbstractCegarLoop]: Interpolant automaton has 98 states. [2019-02-18 09:28:17,979 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 148 transitions. [2019-02-18 09:28:17,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2019-02-18 09:28:17,980 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:28:17,980 INFO L402 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1] [2019-02-18 09:28:17,980 INFO L423 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:28:17,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:28:17,980 INFO L82 PathProgramCache]: Analyzing trace with hash -1568489184, now seen corresponding path program 48 times [2019-02-18 09:28:17,980 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:28:17,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:28:17,981 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:28:17,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:28:17,981 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:28:18,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:28:19,150 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:19,150 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:28:19,151 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:28:19,151 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:28:19,151 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:28:19,151 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:28:19,151 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:28:19,159 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:28:19,160 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:28:19,205 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:28:19,205 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:28:19,211 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:28:19,213 INFO L478 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 6 treesize of output 5 [2019-02-18 09:28:19,213 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:28:19,224 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:28:19,224 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:28:20,635 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:20,635 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:28:23,661 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:23,680 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:28:23,680 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 147 [2019-02-18 09:28:23,680 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:28:23,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 100 states [2019-02-18 09:28:23,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2019-02-18 09:28:23,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9850, Invalid=12202, Unknown=0, NotChecked=0, Total=22052 [2019-02-18 09:28:23,682 INFO L87 Difference]: Start difference. First operand 148 states and 148 transitions. Second operand 100 states. [2019-02-18 09:28:24,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:28:24,073 INFO L93 Difference]: Finished difference Result 153 states and 153 transitions. [2019-02-18 09:28:24,073 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2019-02-18 09:28:24,073 INFO L78 Accepts]: Start accepts. Automaton has 100 states. Word has length 147 [2019-02-18 09:28:24,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:28:24,075 INFO L225 Difference]: With dead ends: 153 [2019-02-18 09:28:24,075 INFO L226 Difference]: Without dead ends: 152 [2019-02-18 09:28:24,076 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9506 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=9850, Invalid=12202, Unknown=0, NotChecked=0, Total=22052 [2019-02-18 09:28:24,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2019-02-18 09:28:24,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 151. [2019-02-18 09:28:24,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2019-02-18 09:28:24,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 151 transitions. [2019-02-18 09:28:24,082 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 151 transitions. Word has length 147 [2019-02-18 09:28:24,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:28:24,082 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 151 transitions. [2019-02-18 09:28:24,082 INFO L481 AbstractCegarLoop]: Interpolant automaton has 100 states. [2019-02-18 09:28:24,082 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 151 transitions. [2019-02-18 09:28:24,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2019-02-18 09:28:24,083 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:28:24,083 INFO L402 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1] [2019-02-18 09:28:24,083 INFO L423 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:28:24,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:28:24,084 INFO L82 PathProgramCache]: Analyzing trace with hash -1912025844, now seen corresponding path program 49 times [2019-02-18 09:28:24,084 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:28:24,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:28:24,085 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:28:24,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:28:24,085 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:28:24,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:28:25,506 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:25,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:28:25,506 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:28:25,506 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:28:25,506 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:28:25,507 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:28:25,507 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:28:25,518 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:28:25,518 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:28:25,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:28:25,572 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:28:25,574 INFO L478 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 6 treesize of output 5 [2019-02-18 09:28:25,574 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:28:25,583 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:28:25,583 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:28:27,083 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:27,084 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:28:30,422 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:30,441 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:28:30,441 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 150 [2019-02-18 09:28:30,441 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:28:30,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2019-02-18 09:28:30,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2019-02-18 09:28:30,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10251, Invalid=12701, Unknown=0, NotChecked=0, Total=22952 [2019-02-18 09:28:30,444 INFO L87 Difference]: Start difference. First operand 151 states and 151 transitions. Second operand 102 states. [2019-02-18 09:28:30,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:28:30,786 INFO L93 Difference]: Finished difference Result 156 states and 156 transitions. [2019-02-18 09:28:30,786 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2019-02-18 09:28:30,786 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 150 [2019-02-18 09:28:30,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:28:30,787 INFO L225 Difference]: With dead ends: 156 [2019-02-18 09:28:30,788 INFO L226 Difference]: Without dead ends: 155 [2019-02-18 09:28:30,789 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9900 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=10251, Invalid=12701, Unknown=0, NotChecked=0, Total=22952 [2019-02-18 09:28:30,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2019-02-18 09:28:30,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2019-02-18 09:28:30,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2019-02-18 09:28:30,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 154 transitions. [2019-02-18 09:28:30,794 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 154 transitions. Word has length 150 [2019-02-18 09:28:30,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:28:30,795 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 154 transitions. [2019-02-18 09:28:30,795 INFO L481 AbstractCegarLoop]: Interpolant automaton has 102 states. [2019-02-18 09:28:30,795 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 154 transitions. [2019-02-18 09:28:30,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2019-02-18 09:28:30,796 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:28:30,796 INFO L402 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1] [2019-02-18 09:28:30,796 INFO L423 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:28:30,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:28:30,796 INFO L82 PathProgramCache]: Analyzing trace with hash -1305597536, now seen corresponding path program 50 times [2019-02-18 09:28:30,797 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:28:30,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:28:30,797 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:28:30,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:28:30,798 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:28:30,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:28:32,266 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:32,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:28:32,267 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:28:32,267 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:28:32,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:28:32,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:28:32,267 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:28:32,278 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:28:32,278 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:28:32,450 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2019-02-18 09:28:32,450 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:28:32,455 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:28:32,461 INFO L478 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 6 treesize of output 5 [2019-02-18 09:28:32,461 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:28:32,477 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:28:32,478 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:28:34,136 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:34,136 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:28:37,292 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:37,310 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:28:37,310 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 151 [2019-02-18 09:28:37,311 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:28:37,311 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2019-02-18 09:28:37,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2019-02-18 09:28:37,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10353, Invalid=12903, Unknown=0, NotChecked=0, Total=23256 [2019-02-18 09:28:37,313 INFO L87 Difference]: Start difference. First operand 154 states and 154 transitions. Second operand 104 states. [2019-02-18 09:28:37,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:28:37,706 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2019-02-18 09:28:37,706 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2019-02-18 09:28:37,706 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 153 [2019-02-18 09:28:37,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:28:37,708 INFO L225 Difference]: With dead ends: 159 [2019-02-18 09:28:37,708 INFO L226 Difference]: Without dead ends: 158 [2019-02-18 09:28:37,709 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 202 SyntacticMatches, 2 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10397 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=10353, Invalid=12903, Unknown=0, NotChecked=0, Total=23256 [2019-02-18 09:28:37,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2019-02-18 09:28:37,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 157. [2019-02-18 09:28:37,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2019-02-18 09:28:37,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 157 transitions. [2019-02-18 09:28:37,712 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 157 transitions. Word has length 153 [2019-02-18 09:28:37,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:28:37,713 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 157 transitions. [2019-02-18 09:28:37,713 INFO L481 AbstractCegarLoop]: Interpolant automaton has 104 states. [2019-02-18 09:28:37,713 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 157 transitions. [2019-02-18 09:28:37,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2019-02-18 09:28:37,714 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:28:37,714 INFO L402 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1] [2019-02-18 09:28:37,714 INFO L423 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:28:37,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:28:37,714 INFO L82 PathProgramCache]: Analyzing trace with hash 167679116, now seen corresponding path program 51 times [2019-02-18 09:28:37,714 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:28:37,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:28:37,715 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:28:37,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:28:37,715 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:28:37,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:28:39,350 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:39,350 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:28:39,350 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:28:39,350 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:28:39,350 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:28:39,350 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:28:39,350 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:28:39,359 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:28:39,359 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:28:39,406 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:28:39,407 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:28:39,412 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:28:39,415 INFO L478 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 6 treesize of output 5 [2019-02-18 09:28:39,415 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:28:39,427 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:28:39,427 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:28:42,306 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:42,306 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:28:45,765 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:45,783 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:28:45,784 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 152 [2019-02-18 09:28:45,784 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:28:45,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 106 states [2019-02-18 09:28:45,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2019-02-18 09:28:45,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10455, Invalid=13107, Unknown=0, NotChecked=0, Total=23562 [2019-02-18 09:28:45,786 INFO L87 Difference]: Start difference. First operand 157 states and 157 transitions. Second operand 106 states. [2019-02-18 09:28:46,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:28:46,160 INFO L93 Difference]: Finished difference Result 162 states and 162 transitions. [2019-02-18 09:28:46,160 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2019-02-18 09:28:46,160 INFO L78 Accepts]: Start accepts. Automaton has 106 states. Word has length 156 [2019-02-18 09:28:46,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:28:46,161 INFO L225 Difference]: With dead ends: 162 [2019-02-18 09:28:46,161 INFO L226 Difference]: Without dead ends: 161 [2019-02-18 09:28:46,163 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 206 SyntacticMatches, 4 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10894 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=10455, Invalid=13107, Unknown=0, NotChecked=0, Total=23562 [2019-02-18 09:28:46,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2019-02-18 09:28:46,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 160. [2019-02-18 09:28:46,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2019-02-18 09:28:46,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 160 transitions. [2019-02-18 09:28:46,166 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 160 transitions. Word has length 156 [2019-02-18 09:28:46,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:28:46,167 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 160 transitions. [2019-02-18 09:28:46,167 INFO L481 AbstractCegarLoop]: Interpolant automaton has 106 states. [2019-02-18 09:28:46,167 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 160 transitions. [2019-02-18 09:28:46,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2019-02-18 09:28:46,168 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:28:46,168 INFO L402 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1] [2019-02-18 09:28:46,168 INFO L423 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:28:46,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:28:46,168 INFO L82 PathProgramCache]: Analyzing trace with hash 281621024, now seen corresponding path program 52 times [2019-02-18 09:28:46,168 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:28:46,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:28:46,169 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:28:46,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:28:46,169 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:28:46,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:28:47,517 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:47,517 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:28:47,517 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:28:47,517 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:28:47,517 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:28:47,517 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:28:47,517 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:28:47,526 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:28:47,526 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:28:47,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:28:47,576 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:28:47,579 INFO L478 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 6 treesize of output 5 [2019-02-18 09:28:47,580 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:28:47,588 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:28:47,589 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:28:49,416 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:49,417 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:28:52,615 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:52,633 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:28:52,633 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 153 [2019-02-18 09:28:52,633 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:28:52,634 INFO L459 AbstractCegarLoop]: Interpolant automaton has 108 states [2019-02-18 09:28:52,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2019-02-18 09:28:52,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10557, Invalid=13313, Unknown=0, NotChecked=0, Total=23870 [2019-02-18 09:28:52,635 INFO L87 Difference]: Start difference. First operand 160 states and 160 transitions. Second operand 108 states. [2019-02-18 09:28:53,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:28:53,107 INFO L93 Difference]: Finished difference Result 165 states and 165 transitions. [2019-02-18 09:28:53,107 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2019-02-18 09:28:53,107 INFO L78 Accepts]: Start accepts. Automaton has 108 states. Word has length 159 [2019-02-18 09:28:53,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:28:53,109 INFO L225 Difference]: With dead ends: 165 [2019-02-18 09:28:53,109 INFO L226 Difference]: Without dead ends: 164 [2019-02-18 09:28:53,110 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 369 GetRequests, 210 SyntacticMatches, 6 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11391 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=10557, Invalid=13313, Unknown=0, NotChecked=0, Total=23870 [2019-02-18 09:28:53,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2019-02-18 09:28:53,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 163. [2019-02-18 09:28:53,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2019-02-18 09:28:53,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 163 transitions. [2019-02-18 09:28:53,116 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 163 transitions. Word has length 159 [2019-02-18 09:28:53,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:28:53,116 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 163 transitions. [2019-02-18 09:28:53,116 INFO L481 AbstractCegarLoop]: Interpolant automaton has 108 states. [2019-02-18 09:28:53,116 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 163 transitions. [2019-02-18 09:28:53,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2019-02-18 09:28:53,117 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:28:53,117 INFO L402 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1] [2019-02-18 09:28:53,117 INFO L423 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:28:53,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:28:53,118 INFO L82 PathProgramCache]: Analyzing trace with hash 1700838412, now seen corresponding path program 53 times [2019-02-18 09:28:53,118 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:28:53,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:28:53,118 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:28:53,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:28:53,119 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:28:53,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:28:54,522 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:54,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:28:54,523 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:28:54,523 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:28:54,523 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:28:54,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:28:54,523 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:28:54,533 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:28:54,533 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:28:54,706 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2019-02-18 09:28:54,706 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:28:54,712 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:28:54,715 INFO L478 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 6 treesize of output 5 [2019-02-18 09:28:54,715 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:28:54,723 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:28:54,723 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:28:57,067 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:28:57,068 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:29:00,751 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:00,769 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:29:00,770 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 154 [2019-02-18 09:29:00,770 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:29:00,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2019-02-18 09:29:00,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2019-02-18 09:29:00,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10659, Invalid=13521, Unknown=0, NotChecked=0, Total=24180 [2019-02-18 09:29:00,771 INFO L87 Difference]: Start difference. First operand 163 states and 163 transitions. Second operand 110 states. [2019-02-18 09:29:01,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:29:01,179 INFO L93 Difference]: Finished difference Result 168 states and 168 transitions. [2019-02-18 09:29:01,180 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2019-02-18 09:29:01,180 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 162 [2019-02-18 09:29:01,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:29:01,181 INFO L225 Difference]: With dead ends: 168 [2019-02-18 09:29:01,181 INFO L226 Difference]: Without dead ends: 167 [2019-02-18 09:29:01,182 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 214 SyntacticMatches, 8 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11888 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=10659, Invalid=13521, Unknown=0, NotChecked=0, Total=24180 [2019-02-18 09:29:01,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2019-02-18 09:29:01,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2019-02-18 09:29:01,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2019-02-18 09:29:01,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 166 transitions. [2019-02-18 09:29:01,186 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 166 transitions. Word has length 162 [2019-02-18 09:29:01,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:29:01,186 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 166 transitions. [2019-02-18 09:29:01,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has 110 states. [2019-02-18 09:29:01,187 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 166 transitions. [2019-02-18 09:29:01,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2019-02-18 09:29:01,187 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:29:01,187 INFO L402 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1] [2019-02-18 09:29:01,187 INFO L423 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:29:01,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:29:01,188 INFO L82 PathProgramCache]: Analyzing trace with hash 1947982496, now seen corresponding path program 54 times [2019-02-18 09:29:01,188 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:29:01,188 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:29:01,188 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:29:01,188 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:29:01,188 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:29:01,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:29:02,662 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:02,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:29:02,662 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:29:02,662 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:29:02,662 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:29:02,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:29:02,662 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:29:02,672 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:29:02,672 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:29:02,724 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:29:02,724 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:29:02,731 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:29:02,747 INFO L478 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 6 treesize of output 5 [2019-02-18 09:29:02,747 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:29:02,835 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:29:02,835 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:29:05,059 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:05,059 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:29:08,369 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:08,387 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:29:08,387 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 155 [2019-02-18 09:29:08,387 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:29:08,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 112 states [2019-02-18 09:29:08,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2019-02-18 09:29:08,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10761, Invalid=13731, Unknown=0, NotChecked=0, Total=24492 [2019-02-18 09:29:08,389 INFO L87 Difference]: Start difference. First operand 166 states and 166 transitions. Second operand 112 states. [2019-02-18 09:29:08,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:29:08,824 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2019-02-18 09:29:08,824 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2019-02-18 09:29:08,824 INFO L78 Accepts]: Start accepts. Automaton has 112 states. Word has length 165 [2019-02-18 09:29:08,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:29:08,825 INFO L225 Difference]: With dead ends: 171 [2019-02-18 09:29:08,826 INFO L226 Difference]: Without dead ends: 170 [2019-02-18 09:29:08,826 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 218 SyntacticMatches, 10 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12385 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=10761, Invalid=13731, Unknown=0, NotChecked=0, Total=24492 [2019-02-18 09:29:08,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2019-02-18 09:29:08,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2019-02-18 09:29:08,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2019-02-18 09:29:08,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 169 transitions. [2019-02-18 09:29:08,831 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 169 transitions. Word has length 165 [2019-02-18 09:29:08,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:29:08,831 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 169 transitions. [2019-02-18 09:29:08,832 INFO L481 AbstractCegarLoop]: Interpolant automaton has 112 states. [2019-02-18 09:29:08,832 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 169 transitions. [2019-02-18 09:29:08,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2019-02-18 09:29:08,832 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:29:08,833 INFO L402 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1] [2019-02-18 09:29:08,833 INFO L423 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:29:08,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:29:08,833 INFO L82 PathProgramCache]: Analyzing trace with hash -1251523700, now seen corresponding path program 55 times [2019-02-18 09:29:08,833 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:29:08,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:29:08,834 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:29:08,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:29:08,834 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:29:08,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:29:10,351 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:10,351 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:29:10,351 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:29:10,351 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:29:10,351 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:29:10,351 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:29:10,351 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:29:10,360 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:29:10,360 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:29:10,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:29:10,410 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:29:10,412 INFO L478 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 6 treesize of output 5 [2019-02-18 09:29:10,412 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:29:10,421 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:29:10,421 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:29:12,236 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:12,236 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:29:15,758 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:15,777 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:29:15,777 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 156 [2019-02-18 09:29:15,777 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:29:15,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 114 states [2019-02-18 09:29:15,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2019-02-18 09:29:15,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10863, Invalid=13943, Unknown=0, NotChecked=0, Total=24806 [2019-02-18 09:29:15,779 INFO L87 Difference]: Start difference. First operand 169 states and 169 transitions. Second operand 114 states. [2019-02-18 09:29:16,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:29:16,151 INFO L93 Difference]: Finished difference Result 174 states and 174 transitions. [2019-02-18 09:29:16,152 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2019-02-18 09:29:16,152 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 168 [2019-02-18 09:29:16,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:29:16,153 INFO L225 Difference]: With dead ends: 174 [2019-02-18 09:29:16,154 INFO L226 Difference]: Without dead ends: 173 [2019-02-18 09:29:16,155 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 222 SyntacticMatches, 12 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12882 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=10863, Invalid=13943, Unknown=0, NotChecked=0, Total=24806 [2019-02-18 09:29:16,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2019-02-18 09:29:16,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 172. [2019-02-18 09:29:16,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2019-02-18 09:29:16,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 172 transitions. [2019-02-18 09:29:16,161 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 172 transitions. Word has length 168 [2019-02-18 09:29:16,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:29:16,161 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 172 transitions. [2019-02-18 09:29:16,161 INFO L481 AbstractCegarLoop]: Interpolant automaton has 114 states. [2019-02-18 09:29:16,161 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 172 transitions. [2019-02-18 09:29:16,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2019-02-18 09:29:16,162 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:29:16,162 INFO L402 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1] [2019-02-18 09:29:16,163 INFO L423 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:29:16,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:29:16,163 INFO L82 PathProgramCache]: Analyzing trace with hash 468591392, now seen corresponding path program 56 times [2019-02-18 09:29:16,163 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:29:16,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:29:16,164 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:29:16,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:29:16,164 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:29:16,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:29:17,724 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:17,724 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:29:17,724 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:29:17,724 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:29:17,724 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:29:17,724 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:29:17,724 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:29:17,735 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:29:17,735 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:29:17,933 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2019-02-18 09:29:17,934 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:29:17,939 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:29:17,942 INFO L478 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 6 treesize of output 5 [2019-02-18 09:29:17,942 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:29:17,953 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:29:17,953 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:29:20,068 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:20,069 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:29:23,521 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:23,540 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:29:23,540 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 157 [2019-02-18 09:29:23,540 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:29:23,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2019-02-18 09:29:23,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2019-02-18 09:29:23,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10965, Invalid=14157, Unknown=0, NotChecked=0, Total=25122 [2019-02-18 09:29:23,542 INFO L87 Difference]: Start difference. First operand 172 states and 172 transitions. Second operand 116 states. [2019-02-18 09:29:24,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:29:24,056 INFO L93 Difference]: Finished difference Result 177 states and 177 transitions. [2019-02-18 09:29:24,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2019-02-18 09:29:24,057 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 171 [2019-02-18 09:29:24,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:29:24,058 INFO L225 Difference]: With dead ends: 177 [2019-02-18 09:29:24,058 INFO L226 Difference]: Without dead ends: 176 [2019-02-18 09:29:24,059 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 226 SyntacticMatches, 14 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13379 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=10965, Invalid=14157, Unknown=0, NotChecked=0, Total=25122 [2019-02-18 09:29:24,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2019-02-18 09:29:24,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 175. [2019-02-18 09:29:24,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2019-02-18 09:29:24,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 175 transitions. [2019-02-18 09:29:24,063 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 175 transitions. Word has length 171 [2019-02-18 09:29:24,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:29:24,063 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 175 transitions. [2019-02-18 09:29:24,063 INFO L481 AbstractCegarLoop]: Interpolant automaton has 116 states. [2019-02-18 09:29:24,064 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 175 transitions. [2019-02-18 09:29:24,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2019-02-18 09:29:24,064 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:29:24,064 INFO L402 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1] [2019-02-18 09:29:24,065 INFO L423 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:29:24,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:29:24,065 INFO L82 PathProgramCache]: Analyzing trace with hash 1162488588, now seen corresponding path program 57 times [2019-02-18 09:29:24,065 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:29:24,066 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:29:24,066 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:29:24,066 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:29:24,066 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:29:24,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:29:25,640 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:25,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:29:25,641 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:29:25,641 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:29:25,641 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:29:25,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:29:25,641 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:29:25,648 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:29:25,649 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:29:25,706 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:29:25,706 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:29:25,711 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:29:25,719 INFO L478 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 6 treesize of output 5 [2019-02-18 09:29:25,719 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:29:25,730 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:29:25,731 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:29:27,769 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:27,770 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:29:31,403 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:31,421 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:29:31,422 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 158 [2019-02-18 09:29:31,422 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:29:31,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 118 states [2019-02-18 09:29:31,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2019-02-18 09:29:31,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11067, Invalid=14373, Unknown=0, NotChecked=0, Total=25440 [2019-02-18 09:29:31,424 INFO L87 Difference]: Start difference. First operand 175 states and 175 transitions. Second operand 118 states. [2019-02-18 09:29:31,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:29:31,838 INFO L93 Difference]: Finished difference Result 180 states and 180 transitions. [2019-02-18 09:29:31,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2019-02-18 09:29:31,838 INFO L78 Accepts]: Start accepts. Automaton has 118 states. Word has length 174 [2019-02-18 09:29:31,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:29:31,839 INFO L225 Difference]: With dead ends: 180 [2019-02-18 09:29:31,839 INFO L226 Difference]: Without dead ends: 179 [2019-02-18 09:29:31,840 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 230 SyntacticMatches, 16 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13876 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=11067, Invalid=14373, Unknown=0, NotChecked=0, Total=25440 [2019-02-18 09:29:31,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2019-02-18 09:29:31,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 178. [2019-02-18 09:29:31,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2019-02-18 09:29:31,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 178 transitions. [2019-02-18 09:29:31,845 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 178 transitions. Word has length 174 [2019-02-18 09:29:31,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:29:31,845 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 178 transitions. [2019-02-18 09:29:31,845 INFO L481 AbstractCegarLoop]: Interpolant automaton has 118 states. [2019-02-18 09:29:31,845 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 178 transitions. [2019-02-18 09:29:31,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2019-02-18 09:29:31,846 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:29:31,846 INFO L402 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1] [2019-02-18 09:29:31,846 INFO L423 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:29:31,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:29:31,846 INFO L82 PathProgramCache]: Analyzing trace with hash 1376258976, now seen corresponding path program 58 times [2019-02-18 09:29:31,846 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:29:31,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:29:31,847 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:29:31,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:29:31,847 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:29:31,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:29:33,502 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:33,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:29:33,502 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:29:33,502 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:29:33,502 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:29:33,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:29:33,502 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:29:33,515 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:29:33,515 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:29:33,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:29:33,569 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:29:33,572 INFO L478 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 6 treesize of output 5 [2019-02-18 09:29:33,572 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:29:33,586 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:29:33,586 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:29:35,878 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:35,878 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:29:39,524 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:39,543 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:29:39,543 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 159 [2019-02-18 09:29:39,543 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:29:39,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 120 states [2019-02-18 09:29:39,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2019-02-18 09:29:39,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11169, Invalid=14591, Unknown=0, NotChecked=0, Total=25760 [2019-02-18 09:29:39,546 INFO L87 Difference]: Start difference. First operand 178 states and 178 transitions. Second operand 120 states. [2019-02-18 09:29:39,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:29:39,982 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2019-02-18 09:29:39,982 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2019-02-18 09:29:39,982 INFO L78 Accepts]: Start accepts. Automaton has 120 states. Word has length 177 [2019-02-18 09:29:39,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:29:39,984 INFO L225 Difference]: With dead ends: 183 [2019-02-18 09:29:39,984 INFO L226 Difference]: Without dead ends: 182 [2019-02-18 09:29:39,984 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 234 SyntacticMatches, 18 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14373 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=11169, Invalid=14591, Unknown=0, NotChecked=0, Total=25760 [2019-02-18 09:29:39,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2019-02-18 09:29:39,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 181. [2019-02-18 09:29:39,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2019-02-18 09:29:39,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 181 transitions. [2019-02-18 09:29:39,989 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 181 transitions. Word has length 177 [2019-02-18 09:29:39,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:29:39,989 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 181 transitions. [2019-02-18 09:29:39,990 INFO L481 AbstractCegarLoop]: Interpolant automaton has 120 states. [2019-02-18 09:29:39,990 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 181 transitions. [2019-02-18 09:29:39,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2019-02-18 09:29:39,991 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:29:39,991 INFO L402 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1] [2019-02-18 09:29:39,991 INFO L423 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:29:39,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:29:39,991 INFO L82 PathProgramCache]: Analyzing trace with hash 373387916, now seen corresponding path program 59 times [2019-02-18 09:29:39,991 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:29:39,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:29:39,992 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:29:39,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:29:39,992 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:29:40,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:29:41,719 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:41,720 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:29:41,720 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:29:41,720 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:29:41,720 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:29:41,720 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:29:41,720 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:29:41,728 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:29:41,729 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:29:42,268 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2019-02-18 09:29:42,269 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:29:42,275 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:29:42,280 INFO L478 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 6 treesize of output 5 [2019-02-18 09:29:42,280 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:29:42,289 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:29:42,289 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:29:44,548 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:44,548 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:29:48,087 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:48,106 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:29:48,107 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 160 [2019-02-18 09:29:48,107 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:29:48,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2019-02-18 09:29:48,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2019-02-18 09:29:48,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11271, Invalid=14811, Unknown=0, NotChecked=0, Total=26082 [2019-02-18 09:29:48,109 INFO L87 Difference]: Start difference. First operand 181 states and 181 transitions. Second operand 122 states. [2019-02-18 09:29:48,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:29:48,498 INFO L93 Difference]: Finished difference Result 186 states and 186 transitions. [2019-02-18 09:29:48,498 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2019-02-18 09:29:48,498 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 180 [2019-02-18 09:29:48,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:29:48,500 INFO L225 Difference]: With dead ends: 186 [2019-02-18 09:29:48,500 INFO L226 Difference]: Without dead ends: 185 [2019-02-18 09:29:48,501 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 238 SyntacticMatches, 20 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14870 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=11271, Invalid=14811, Unknown=0, NotChecked=0, Total=26082 [2019-02-18 09:29:48,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2019-02-18 09:29:48,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2019-02-18 09:29:48,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2019-02-18 09:29:48,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 184 transitions. [2019-02-18 09:29:48,506 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 184 transitions. Word has length 180 [2019-02-18 09:29:48,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:29:48,506 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 184 transitions. [2019-02-18 09:29:48,507 INFO L481 AbstractCegarLoop]: Interpolant automaton has 122 states. [2019-02-18 09:29:48,507 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 184 transitions. [2019-02-18 09:29:48,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2019-02-18 09:29:48,508 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:29:48,508 INFO L402 BasicCegarLoop]: trace histogram [61, 60, 60, 1, 1] [2019-02-18 09:29:48,508 INFO L423 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:29:48,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:29:48,508 INFO L82 PathProgramCache]: Analyzing trace with hash -365849568, now seen corresponding path program 60 times [2019-02-18 09:29:48,508 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:29:48,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:29:48,509 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:29:48,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:29:48,509 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:29:48,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:29:50,586 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:50,586 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:29:50,586 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:29:50,586 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:29:50,586 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:29:50,586 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:29:50,587 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:29:50,595 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:29:50,595 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:29:50,651 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:29:50,652 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:29:50,658 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:29:50,676 INFO L478 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 6 treesize of output 5 [2019-02-18 09:29:50,676 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:29:50,732 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:29:50,733 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:29:52,881 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:52,881 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:29:56,696 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:56,714 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:29:56,714 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 161 [2019-02-18 09:29:56,714 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:29:56,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 124 states [2019-02-18 09:29:56,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2019-02-18 09:29:56,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11373, Invalid=15033, Unknown=0, NotChecked=0, Total=26406 [2019-02-18 09:29:56,716 INFO L87 Difference]: Start difference. First operand 184 states and 184 transitions. Second operand 124 states. [2019-02-18 09:29:57,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:29:57,180 INFO L93 Difference]: Finished difference Result 189 states and 189 transitions. [2019-02-18 09:29:57,181 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2019-02-18 09:29:57,181 INFO L78 Accepts]: Start accepts. Automaton has 124 states. Word has length 183 [2019-02-18 09:29:57,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:29:57,182 INFO L225 Difference]: With dead ends: 189 [2019-02-18 09:29:57,182 INFO L226 Difference]: Without dead ends: 188 [2019-02-18 09:29:57,183 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 242 SyntacticMatches, 22 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15367 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=11373, Invalid=15033, Unknown=0, NotChecked=0, Total=26406 [2019-02-18 09:29:57,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2019-02-18 09:29:57,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 187. [2019-02-18 09:29:57,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2019-02-18 09:29:57,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 187 transitions. [2019-02-18 09:29:57,187 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 187 transitions. Word has length 183 [2019-02-18 09:29:57,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:29:57,187 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 187 transitions. [2019-02-18 09:29:57,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has 124 states. [2019-02-18 09:29:57,188 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 187 transitions. [2019-02-18 09:29:57,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2019-02-18 09:29:57,188 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:29:57,188 INFO L402 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1] [2019-02-18 09:29:57,188 INFO L423 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:29:57,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:29:57,189 INFO L82 PathProgramCache]: Analyzing trace with hash 1602558476, now seen corresponding path program 61 times [2019-02-18 09:29:57,189 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:29:57,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:29:57,189 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:29:57,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:29:57,189 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:29:57,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:29:58,997 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:29:58,997 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:29:58,997 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:29:58,997 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:29:58,997 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:29:58,997 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:29:58,997 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:29:59,006 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:29:59,007 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:29:59,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:29:59,061 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:29:59,064 INFO L478 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 6 treesize of output 5 [2019-02-18 09:29:59,064 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:29:59,073 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:29:59,074 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:30:01,509 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:01,510 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:30:05,593 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:05,611 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:30:05,611 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 162 [2019-02-18 09:30:05,612 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:30:05,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 126 states [2019-02-18 09:30:05,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2019-02-18 09:30:05,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11475, Invalid=15257, Unknown=0, NotChecked=0, Total=26732 [2019-02-18 09:30:05,614 INFO L87 Difference]: Start difference. First operand 187 states and 187 transitions. Second operand 126 states. [2019-02-18 09:30:06,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:30:06,119 INFO L93 Difference]: Finished difference Result 192 states and 192 transitions. [2019-02-18 09:30:06,119 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2019-02-18 09:30:06,119 INFO L78 Accepts]: Start accepts. Automaton has 126 states. Word has length 186 [2019-02-18 09:30:06,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:30:06,120 INFO L225 Difference]: With dead ends: 192 [2019-02-18 09:30:06,121 INFO L226 Difference]: Without dead ends: 191 [2019-02-18 09:30:06,122 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 432 GetRequests, 246 SyntacticMatches, 24 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15864 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=11475, Invalid=15257, Unknown=0, NotChecked=0, Total=26732 [2019-02-18 09:30:06,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2019-02-18 09:30:06,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 190. [2019-02-18 09:30:06,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2019-02-18 09:30:06,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 190 transitions. [2019-02-18 09:30:06,126 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 190 transitions. Word has length 186 [2019-02-18 09:30:06,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:30:06,126 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 190 transitions. [2019-02-18 09:30:06,126 INFO L481 AbstractCegarLoop]: Interpolant automaton has 126 states. [2019-02-18 09:30:06,126 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 190 transitions. [2019-02-18 09:30:06,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2019-02-18 09:30:06,127 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:30:06,127 INFO L402 BasicCegarLoop]: trace histogram [63, 62, 62, 1, 1] [2019-02-18 09:30:06,127 INFO L423 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:30:06,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:30:06,127 INFO L82 PathProgramCache]: Analyzing trace with hash -1036862304, now seen corresponding path program 62 times [2019-02-18 09:30:06,127 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:30:06,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:30:06,128 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:30:06,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:30:06,128 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:30:06,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:30:08,177 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:08,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:30:08,178 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:30:08,178 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:30:08,178 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:30:08,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:30:08,178 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:30:08,187 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:30:08,187 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:30:08,424 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 63 check-sat command(s) [2019-02-18 09:30:08,424 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:30:08,431 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:30:08,435 INFO L478 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 6 treesize of output 5 [2019-02-18 09:30:08,435 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:30:08,446 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:30:08,446 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:30:10,981 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:10,981 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:30:14,533 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:14,553 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:30:14,554 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 163 [2019-02-18 09:30:14,554 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:30:14,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2019-02-18 09:30:14,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2019-02-18 09:30:14,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11577, Invalid=15483, Unknown=0, NotChecked=0, Total=27060 [2019-02-18 09:30:14,556 INFO L87 Difference]: Start difference. First operand 190 states and 190 transitions. Second operand 128 states. [2019-02-18 09:30:15,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:30:15,152 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2019-02-18 09:30:15,152 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2019-02-18 09:30:15,152 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 189 [2019-02-18 09:30:15,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:30:15,153 INFO L225 Difference]: With dead ends: 195 [2019-02-18 09:30:15,153 INFO L226 Difference]: Without dead ends: 194 [2019-02-18 09:30:15,153 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 439 GetRequests, 250 SyntacticMatches, 26 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16361 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=11577, Invalid=15483, Unknown=0, NotChecked=0, Total=27060 [2019-02-18 09:30:15,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2019-02-18 09:30:15,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 193. [2019-02-18 09:30:15,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2019-02-18 09:30:15,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 193 transitions. [2019-02-18 09:30:15,157 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 193 transitions. Word has length 189 [2019-02-18 09:30:15,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:30:15,157 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 193 transitions. [2019-02-18 09:30:15,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has 128 states. [2019-02-18 09:30:15,158 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 193 transitions. [2019-02-18 09:30:15,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2019-02-18 09:30:15,158 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:30:15,158 INFO L402 BasicCegarLoop]: trace histogram [64, 63, 63, 1, 1] [2019-02-18 09:30:15,158 INFO L423 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:30:15,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:30:15,159 INFO L82 PathProgramCache]: Analyzing trace with hash 239935884, now seen corresponding path program 63 times [2019-02-18 09:30:15,159 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:30:15,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:30:15,160 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:30:15,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:30:15,160 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:30:15,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:30:17,111 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:17,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:30:17,112 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:30:17,112 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:30:17,112 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:30:17,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:30:17,112 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:30:17,123 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:30:17,124 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:30:17,184 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:30:17,184 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:30:17,191 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:30:17,198 INFO L478 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 6 treesize of output 5 [2019-02-18 09:30:17,198 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:30:17,206 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:30:17,206 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:30:19,552 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:19,553 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:30:23,550 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:23,569 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:30:23,569 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 164 [2019-02-18 09:30:23,569 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:30:23,570 INFO L459 AbstractCegarLoop]: Interpolant automaton has 130 states [2019-02-18 09:30:23,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2019-02-18 09:30:23,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11679, Invalid=15711, Unknown=0, NotChecked=0, Total=27390 [2019-02-18 09:30:23,572 INFO L87 Difference]: Start difference. First operand 193 states and 193 transitions. Second operand 130 states. [2019-02-18 09:30:24,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:30:24,077 INFO L93 Difference]: Finished difference Result 198 states and 198 transitions. [2019-02-18 09:30:24,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2019-02-18 09:30:24,078 INFO L78 Accepts]: Start accepts. Automaton has 130 states. Word has length 192 [2019-02-18 09:30:24,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:30:24,079 INFO L225 Difference]: With dead ends: 198 [2019-02-18 09:30:24,079 INFO L226 Difference]: Without dead ends: 197 [2019-02-18 09:30:24,081 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 254 SyntacticMatches, 28 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16858 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=11679, Invalid=15711, Unknown=0, NotChecked=0, Total=27390 [2019-02-18 09:30:24,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2019-02-18 09:30:24,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 196. [2019-02-18 09:30:24,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2019-02-18 09:30:24,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 196 transitions. [2019-02-18 09:30:24,087 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 196 transitions. Word has length 192 [2019-02-18 09:30:24,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:30:24,087 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 196 transitions. [2019-02-18 09:30:24,087 INFO L481 AbstractCegarLoop]: Interpolant automaton has 130 states. [2019-02-18 09:30:24,088 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 196 transitions. [2019-02-18 09:30:24,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2019-02-18 09:30:24,088 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:30:24,089 INFO L402 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1] [2019-02-18 09:30:24,089 INFO L423 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:30:24,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:30:24,089 INFO L82 PathProgramCache]: Analyzing trace with hash 1104381216, now seen corresponding path program 64 times [2019-02-18 09:30:24,089 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:30:24,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:30:24,090 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:30:24,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:30:24,090 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:30:24,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:30:26,192 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:26,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:30:26,193 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:30:26,193 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:30:26,193 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:30:26,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:30:26,193 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:30:26,209 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:30:26,210 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:30:26,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:30:26,268 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:30:26,274 INFO L478 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 6 treesize of output 5 [2019-02-18 09:30:26,275 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:30:26,286 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:30:26,286 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:30:28,680 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:28,680 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:30:32,462 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:32,482 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:30:32,482 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 165 [2019-02-18 09:30:32,482 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:30:32,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2019-02-18 09:30:32,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2019-02-18 09:30:32,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11781, Invalid=15941, Unknown=0, NotChecked=0, Total=27722 [2019-02-18 09:30:32,485 INFO L87 Difference]: Start difference. First operand 196 states and 196 transitions. Second operand 132 states. [2019-02-18 09:30:32,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:30:32,938 INFO L93 Difference]: Finished difference Result 201 states and 201 transitions. [2019-02-18 09:30:32,939 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2019-02-18 09:30:32,939 INFO L78 Accepts]: Start accepts. Automaton has 132 states. Word has length 195 [2019-02-18 09:30:32,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:30:32,940 INFO L225 Difference]: With dead ends: 201 [2019-02-18 09:30:32,940 INFO L226 Difference]: Without dead ends: 200 [2019-02-18 09:30:32,941 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 258 SyntacticMatches, 30 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17355 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=11781, Invalid=15941, Unknown=0, NotChecked=0, Total=27722 [2019-02-18 09:30:32,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2019-02-18 09:30:32,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 199. [2019-02-18 09:30:32,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2019-02-18 09:30:32,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 199 transitions. [2019-02-18 09:30:32,947 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 199 transitions. Word has length 195 [2019-02-18 09:30:32,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:30:32,948 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 199 transitions. [2019-02-18 09:30:32,948 INFO L481 AbstractCegarLoop]: Interpolant automaton has 132 states. [2019-02-18 09:30:32,948 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 199 transitions. [2019-02-18 09:30:32,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2019-02-18 09:30:32,949 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:30:32,949 INFO L402 BasicCegarLoop]: trace histogram [66, 65, 65, 1, 1] [2019-02-18 09:30:32,949 INFO L423 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:30:32,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:30:32,950 INFO L82 PathProgramCache]: Analyzing trace with hash 1171360012, now seen corresponding path program 65 times [2019-02-18 09:30:32,950 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:30:32,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:30:32,951 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:30:32,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:30:32,951 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:30:32,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:30:34,997 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:34,997 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:30:34,997 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:30:34,997 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:30:34,997 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:30:34,997 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:30:34,997 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:30:35,006 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:30:35,006 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:30:35,269 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2019-02-18 09:30:35,270 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:30:35,277 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:30:35,279 INFO L478 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 6 treesize of output 5 [2019-02-18 09:30:35,279 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:30:35,289 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:30:35,289 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:30:37,991 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:37,991 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:30:41,854 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:41,874 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:30:41,874 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 166 [2019-02-18 09:30:41,875 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:30:41,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2019-02-18 09:30:41,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2019-02-18 09:30:41,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11883, Invalid=16173, Unknown=0, NotChecked=0, Total=28056 [2019-02-18 09:30:41,877 INFO L87 Difference]: Start difference. First operand 199 states and 199 transitions. Second operand 134 states. [2019-02-18 09:30:42,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:30:42,338 INFO L93 Difference]: Finished difference Result 204 states and 204 transitions. [2019-02-18 09:30:42,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2019-02-18 09:30:42,339 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 198 [2019-02-18 09:30:42,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:30:42,339 INFO L225 Difference]: With dead ends: 204 [2019-02-18 09:30:42,340 INFO L226 Difference]: Without dead ends: 203 [2019-02-18 09:30:42,340 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 262 SyntacticMatches, 32 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17852 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=11883, Invalid=16173, Unknown=0, NotChecked=0, Total=28056 [2019-02-18 09:30:42,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2019-02-18 09:30:42,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 202. [2019-02-18 09:30:42,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2019-02-18 09:30:42,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 202 transitions. [2019-02-18 09:30:42,346 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 202 transitions. Word has length 198 [2019-02-18 09:30:42,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:30:42,346 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 202 transitions. [2019-02-18 09:30:42,346 INFO L481 AbstractCegarLoop]: Interpolant automaton has 134 states. [2019-02-18 09:30:42,346 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 202 transitions. [2019-02-18 09:30:42,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2019-02-18 09:30:42,347 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:30:42,347 INFO L402 BasicCegarLoop]: trace histogram [67, 66, 66, 1, 1] [2019-02-18 09:30:42,347 INFO L423 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:30:42,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:30:42,348 INFO L82 PathProgramCache]: Analyzing trace with hash -623120992, now seen corresponding path program 66 times [2019-02-18 09:30:42,348 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:30:42,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:30:42,349 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:30:42,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:30:42,349 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:30:42,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:30:44,440 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:44,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:30:44,441 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:30:44,441 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:30:44,441 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:30:44,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:30:44,441 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:30:44,450 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:30:44,450 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:30:44,515 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:30:44,515 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:30:44,522 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:30:44,529 INFO L478 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 6 treesize of output 5 [2019-02-18 09:30:44,529 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:30:44,536 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:30:44,536 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:30:47,260 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:47,260 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:30:51,262 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:51,280 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:30:51,281 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 167 [2019-02-18 09:30:51,281 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:30:51,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 136 states [2019-02-18 09:30:51,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2019-02-18 09:30:51,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11985, Invalid=16407, Unknown=0, NotChecked=0, Total=28392 [2019-02-18 09:30:51,283 INFO L87 Difference]: Start difference. First operand 202 states and 202 transitions. Second operand 136 states. [2019-02-18 09:30:51,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:30:51,803 INFO L93 Difference]: Finished difference Result 207 states and 207 transitions. [2019-02-18 09:30:51,803 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2019-02-18 09:30:51,803 INFO L78 Accepts]: Start accepts. Automaton has 136 states. Word has length 201 [2019-02-18 09:30:51,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:30:51,804 INFO L225 Difference]: With dead ends: 207 [2019-02-18 09:30:51,804 INFO L226 Difference]: Without dead ends: 206 [2019-02-18 09:30:51,805 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 266 SyntacticMatches, 34 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18349 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=11985, Invalid=16407, Unknown=0, NotChecked=0, Total=28392 [2019-02-18 09:30:51,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2019-02-18 09:30:51,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 205. [2019-02-18 09:30:51,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2019-02-18 09:30:51,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 205 transitions. [2019-02-18 09:30:51,809 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 205 transitions. Word has length 201 [2019-02-18 09:30:51,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:30:51,809 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 205 transitions. [2019-02-18 09:30:51,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has 136 states. [2019-02-18 09:30:51,809 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 205 transitions. [2019-02-18 09:30:51,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2019-02-18 09:30:51,810 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:30:51,810 INFO L402 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1] [2019-02-18 09:30:51,810 INFO L423 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:30:51,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:30:51,811 INFO L82 PathProgramCache]: Analyzing trace with hash -548777844, now seen corresponding path program 67 times [2019-02-18 09:30:51,811 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:30:51,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:30:51,811 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:30:51,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:30:51,811 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:30:51,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:30:53,949 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:53,949 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:30:53,949 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:30:53,949 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:30:53,949 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:30:53,949 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:30:53,949 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:30:53,959 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:30:53,959 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:30:54,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:30:54,022 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:30:54,025 INFO L478 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 6 treesize of output 5 [2019-02-18 09:30:54,025 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:30:54,036 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:30:54,036 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:30:56,917 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:30:56,918 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:31:00,588 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:31:00,606 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:31:00,606 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 168 [2019-02-18 09:31:00,606 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:31:00,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 138 states [2019-02-18 09:31:00,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 138 interpolants. [2019-02-18 09:31:00,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12087, Invalid=16643, Unknown=0, NotChecked=0, Total=28730 [2019-02-18 09:31:00,609 INFO L87 Difference]: Start difference. First operand 205 states and 205 transitions. Second operand 138 states. [2019-02-18 09:31:01,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:31:01,074 INFO L93 Difference]: Finished difference Result 210 states and 210 transitions. [2019-02-18 09:31:01,075 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2019-02-18 09:31:01,075 INFO L78 Accepts]: Start accepts. Automaton has 138 states. Word has length 204 [2019-02-18 09:31:01,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:31:01,076 INFO L225 Difference]: With dead ends: 210 [2019-02-18 09:31:01,076 INFO L226 Difference]: Without dead ends: 209 [2019-02-18 09:31:01,077 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 270 SyntacticMatches, 36 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18846 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=12087, Invalid=16643, Unknown=0, NotChecked=0, Total=28730 [2019-02-18 09:31:01,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2019-02-18 09:31:01,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 208. [2019-02-18 09:31:01,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2019-02-18 09:31:01,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 208 transitions. [2019-02-18 09:31:01,082 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 208 transitions. Word has length 204 [2019-02-18 09:31:01,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:31:01,083 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 208 transitions. [2019-02-18 09:31:01,083 INFO L481 AbstractCegarLoop]: Interpolant automaton has 138 states. [2019-02-18 09:31:01,083 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 208 transitions. [2019-02-18 09:31:01,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2019-02-18 09:31:01,083 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:31:01,084 INFO L402 BasicCegarLoop]: trace histogram [69, 68, 68, 1, 1] [2019-02-18 09:31:01,084 INFO L423 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:31:01,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:31:01,084 INFO L82 PathProgramCache]: Analyzing trace with hash -1995180512, now seen corresponding path program 68 times [2019-02-18 09:31:01,084 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:31:01,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:31:01,085 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:31:01,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:31:01,085 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:31:01,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:31:03,273 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:31:03,273 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:31:03,273 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:31:03,273 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:31:03,273 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:31:03,274 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:31:03,274 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:31:03,282 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:31:03,283 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:31:03,562 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2019-02-18 09:31:03,562 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:31:03,569 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:31:03,571 INFO L478 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 6 treesize of output 5 [2019-02-18 09:31:03,571 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:31:03,582 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:31:03,582 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:31:06,517 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:31:06,517 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:31:10,254 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:31:10,273 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:31:10,273 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 169 [2019-02-18 09:31:10,273 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:31:10,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2019-02-18 09:31:10,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2019-02-18 09:31:10,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12189, Invalid=16881, Unknown=0, NotChecked=0, Total=29070 [2019-02-18 09:31:10,276 INFO L87 Difference]: Start difference. First operand 208 states and 208 transitions. Second operand 140 states. [2019-02-18 09:31:10,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:31:10,849 INFO L93 Difference]: Finished difference Result 213 states and 213 transitions. [2019-02-18 09:31:10,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2019-02-18 09:31:10,850 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 207 [2019-02-18 09:31:10,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:31:10,851 INFO L225 Difference]: With dead ends: 213 [2019-02-18 09:31:10,851 INFO L226 Difference]: Without dead ends: 212 [2019-02-18 09:31:10,852 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 274 SyntacticMatches, 38 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19343 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=12189, Invalid=16881, Unknown=0, NotChecked=0, Total=29070 [2019-02-18 09:31:10,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2019-02-18 09:31:10,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 211. [2019-02-18 09:31:10,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 211 states. [2019-02-18 09:31:10,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 211 transitions. [2019-02-18 09:31:10,858 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 211 transitions. Word has length 207 [2019-02-18 09:31:10,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:31:10,858 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 211 transitions. [2019-02-18 09:31:10,858 INFO L481 AbstractCegarLoop]: Interpolant automaton has 140 states. [2019-02-18 09:31:10,858 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 211 transitions. [2019-02-18 09:31:10,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2019-02-18 09:31:10,859 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:31:10,860 INFO L402 BasicCegarLoop]: trace histogram [70, 69, 69, 1, 1] [2019-02-18 09:31:10,860 INFO L423 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:31:10,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:31:10,860 INFO L82 PathProgramCache]: Analyzing trace with hash -370182132, now seen corresponding path program 69 times [2019-02-18 09:31:10,860 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:31:10,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:31:10,861 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:31:10,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:31:10,861 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:31:10,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:31:13,413 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:31:13,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:31:13,413 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:31:13,413 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:31:13,413 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:31:13,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:31:13,414 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:31:13,422 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:31:13,422 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:31:13,491 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:31:13,491 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:31:13,498 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:31:13,501 INFO L478 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 6 treesize of output 5 [2019-02-18 09:31:13,501 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:31:13,510 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:31:13,510 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:31:16,239 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:31:16,239 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:31:20,276 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:31:20,294 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:31:20,295 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 170 [2019-02-18 09:31:20,295 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:31:20,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 142 states [2019-02-18 09:31:20,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2019-02-18 09:31:20,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12291, Invalid=17121, Unknown=0, NotChecked=0, Total=29412 [2019-02-18 09:31:20,298 INFO L87 Difference]: Start difference. First operand 211 states and 211 transitions. Second operand 142 states. [2019-02-18 09:31:20,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:31:20,809 INFO L93 Difference]: Finished difference Result 216 states and 216 transitions. [2019-02-18 09:31:20,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2019-02-18 09:31:20,810 INFO L78 Accepts]: Start accepts. Automaton has 142 states. Word has length 210 [2019-02-18 09:31:20,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:31:20,811 INFO L225 Difference]: With dead ends: 216 [2019-02-18 09:31:20,811 INFO L226 Difference]: Without dead ends: 215 [2019-02-18 09:31:20,812 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 278 SyntacticMatches, 40 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19840 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=12291, Invalid=17121, Unknown=0, NotChecked=0, Total=29412 [2019-02-18 09:31:20,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2019-02-18 09:31:20,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 214. [2019-02-18 09:31:20,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2019-02-18 09:31:20,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 214 transitions. [2019-02-18 09:31:20,819 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 214 transitions. Word has length 210 [2019-02-18 09:31:20,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:31:20,819 INFO L480 AbstractCegarLoop]: Abstraction has 214 states and 214 transitions. [2019-02-18 09:31:20,819 INFO L481 AbstractCegarLoop]: Interpolant automaton has 142 states. [2019-02-18 09:31:20,819 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 214 transitions. [2019-02-18 09:31:20,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2019-02-18 09:31:20,820 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:31:20,820 INFO L402 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1] [2019-02-18 09:31:20,820 INFO L423 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:31:20,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:31:20,821 INFO L82 PathProgramCache]: Analyzing trace with hash 1380163232, now seen corresponding path program 70 times [2019-02-18 09:31:20,821 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:31:20,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:31:20,822 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:31:20,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:31:20,822 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:31:20,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:31:23,384 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:31:23,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:31:23,385 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:31:23,385 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:31:23,385 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:31:23,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:31:23,385 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:31:23,393 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:31:23,393 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:31:23,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:31:23,457 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:31:23,460 INFO L478 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 6 treesize of output 5 [2019-02-18 09:31:23,460 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:31:23,475 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:31:23,475 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:31:26,291 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:31:26,291 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:31:30,518 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:31:30,536 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:31:30,537 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 171 [2019-02-18 09:31:30,537 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:31:30,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 144 states [2019-02-18 09:31:30,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2019-02-18 09:31:30,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12393, Invalid=17363, Unknown=0, NotChecked=0, Total=29756 [2019-02-18 09:31:30,539 INFO L87 Difference]: Start difference. First operand 214 states and 214 transitions. Second operand 144 states. [2019-02-18 09:31:30,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:31:31,000 INFO L93 Difference]: Finished difference Result 219 states and 219 transitions. [2019-02-18 09:31:31,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2019-02-18 09:31:31,000 INFO L78 Accepts]: Start accepts. Automaton has 144 states. Word has length 213 [2019-02-18 09:31:31,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:31:31,002 INFO L225 Difference]: With dead ends: 219 [2019-02-18 09:31:31,002 INFO L226 Difference]: Without dead ends: 218 [2019-02-18 09:31:31,003 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 282 SyntacticMatches, 42 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20337 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=12393, Invalid=17363, Unknown=0, NotChecked=0, Total=29756 [2019-02-18 09:31:31,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2019-02-18 09:31:31,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 217. [2019-02-18 09:31:31,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2019-02-18 09:31:31,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 217 transitions. [2019-02-18 09:31:31,007 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 217 transitions. Word has length 213 [2019-02-18 09:31:31,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:31:31,008 INFO L480 AbstractCegarLoop]: Abstraction has 217 states and 217 transitions. [2019-02-18 09:31:31,008 INFO L481 AbstractCegarLoop]: Interpolant automaton has 144 states. [2019-02-18 09:31:31,008 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 217 transitions. [2019-02-18 09:31:31,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2019-02-18 09:31:31,009 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:31:31,009 INFO L402 BasicCegarLoop]: trace histogram [72, 71, 71, 1, 1] [2019-02-18 09:31:31,009 INFO L423 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:31:31,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:31:31,010 INFO L82 PathProgramCache]: Analyzing trace with hash 720961420, now seen corresponding path program 71 times [2019-02-18 09:31:31,010 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:31:31,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:31:31,010 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:31:31,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:31:31,011 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:31:31,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:31:33,708 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 0 proven. 7597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:31:33,709 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:31:33,709 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:31:33,709 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:31:33,709 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:31:33,709 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:31:33,709 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:31:33,718 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:31:33,718 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:31:34,055 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 72 check-sat command(s) [2019-02-18 09:31:34,055 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:31:34,064 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:31:34,067 INFO L478 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 6 treesize of output 5 [2019-02-18 09:31:34,067 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:31:34,075 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:31:34,075 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:31:37,180 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 0 proven. 7597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:31:37,180 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:31:41,043 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 0 proven. 7597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:31:41,062 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:31:41,062 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 172 [2019-02-18 09:31:41,062 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:31:41,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2019-02-18 09:31:41,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2019-02-18 09:31:41,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12495, Invalid=17607, Unknown=0, NotChecked=0, Total=30102 [2019-02-18 09:31:41,065 INFO L87 Difference]: Start difference. First operand 217 states and 217 transitions. Second operand 146 states. [2019-02-18 09:31:41,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:31:41,564 INFO L93 Difference]: Finished difference Result 222 states and 222 transitions. [2019-02-18 09:31:41,564 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2019-02-18 09:31:41,564 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 216 [2019-02-18 09:31:41,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:31:41,566 INFO L225 Difference]: With dead ends: 222 [2019-02-18 09:31:41,566 INFO L226 Difference]: Without dead ends: 221 [2019-02-18 09:31:41,567 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 286 SyntacticMatches, 44 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20834 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=12495, Invalid=17607, Unknown=0, NotChecked=0, Total=30102 [2019-02-18 09:31:41,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2019-02-18 09:31:41,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 220. [2019-02-18 09:31:41,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2019-02-18 09:31:41,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 220 transitions. [2019-02-18 09:31:41,571 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 220 transitions. Word has length 216 [2019-02-18 09:31:41,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:31:41,572 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 220 transitions. [2019-02-18 09:31:41,572 INFO L481 AbstractCegarLoop]: Interpolant automaton has 146 states. [2019-02-18 09:31:41,572 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 220 transitions. [2019-02-18 09:31:41,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2019-02-18 09:31:41,573 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:31:41,573 INFO L402 BasicCegarLoop]: trace histogram [73, 72, 72, 1, 1] [2019-02-18 09:31:41,573 INFO L423 AbstractCegarLoop]: === Iteration 73 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:31:41,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:31:41,573 INFO L82 PathProgramCache]: Analyzing trace with hash -969742560, now seen corresponding path program 72 times [2019-02-18 09:31:41,573 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:31:41,574 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:31:41,574 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:31:41,574 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:31:41,574 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:31:41,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:31:44,321 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 0 proven. 7812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:31:44,321 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:31:44,321 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:31:44,321 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:31:44,321 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:31:44,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:31:44,322 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:31:44,329 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:31:44,330 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:31:44,403 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:31:44,403 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:31:44,410 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:31:44,413 INFO L478 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 6 treesize of output 5 [2019-02-18 09:31:44,413 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:31:44,424 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:31:44,424 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:31:47,606 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 0 proven. 7812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:31:47,607 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:31:51,565 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 0 proven. 7812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:31:51,584 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:31:51,584 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 173 [2019-02-18 09:31:51,585 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:31:51,585 INFO L459 AbstractCegarLoop]: Interpolant automaton has 148 states [2019-02-18 09:31:51,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2019-02-18 09:31:51,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12597, Invalid=17853, Unknown=0, NotChecked=0, Total=30450 [2019-02-18 09:31:51,587 INFO L87 Difference]: Start difference. First operand 220 states and 220 transitions. Second operand 148 states. [2019-02-18 09:31:52,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:31:52,074 INFO L93 Difference]: Finished difference Result 225 states and 225 transitions. [2019-02-18 09:31:52,074 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2019-02-18 09:31:52,074 INFO L78 Accepts]: Start accepts. Automaton has 148 states. Word has length 219 [2019-02-18 09:31:52,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:31:52,076 INFO L225 Difference]: With dead ends: 225 [2019-02-18 09:31:52,076 INFO L226 Difference]: Without dead ends: 224 [2019-02-18 09:31:52,077 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 290 SyntacticMatches, 46 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21331 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=12597, Invalid=17853, Unknown=0, NotChecked=0, Total=30450 [2019-02-18 09:31:52,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2019-02-18 09:31:52,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 223. [2019-02-18 09:31:52,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2019-02-18 09:31:52,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 223 transitions. [2019-02-18 09:31:52,081 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 223 transitions. Word has length 219 [2019-02-18 09:31:52,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:31:52,081 INFO L480 AbstractCegarLoop]: Abstraction has 223 states and 223 transitions. [2019-02-18 09:31:52,081 INFO L481 AbstractCegarLoop]: Interpolant automaton has 148 states. [2019-02-18 09:31:52,081 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 223 transitions. [2019-02-18 09:31:52,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2019-02-18 09:31:52,082 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:31:52,082 INFO L402 BasicCegarLoop]: trace histogram [74, 73, 73, 1, 1] [2019-02-18 09:31:52,082 INFO L423 AbstractCegarLoop]: === Iteration 74 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:31:52,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:31:52,083 INFO L82 PathProgramCache]: Analyzing trace with hash -1650530548, now seen corresponding path program 73 times [2019-02-18 09:31:52,083 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:31:52,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:31:52,083 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:31:52,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:31:52,083 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:31:52,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:31:54,792 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:31:54,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:31:54,792 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:31:54,792 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:31:54,792 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:31:54,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:31:54,793 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:31:54,802 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:31:54,802 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:31:54,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:31:54,871 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:31:54,874 INFO L478 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 6 treesize of output 5 [2019-02-18 09:31:54,874 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:31:54,884 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:31:54,884 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:31:58,259 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:31:58,259 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:32:02,248 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:32:02,267 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:32:02,268 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 174 [2019-02-18 09:32:02,268 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:32:02,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 150 states [2019-02-18 09:32:02,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 150 interpolants. [2019-02-18 09:32:02,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12699, Invalid=18101, Unknown=0, NotChecked=0, Total=30800 [2019-02-18 09:32:02,271 INFO L87 Difference]: Start difference. First operand 223 states and 223 transitions. Second operand 150 states. [2019-02-18 09:32:02,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:32:02,920 INFO L93 Difference]: Finished difference Result 228 states and 228 transitions. [2019-02-18 09:32:02,920 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2019-02-18 09:32:02,920 INFO L78 Accepts]: Start accepts. Automaton has 150 states. Word has length 222 [2019-02-18 09:32:02,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:32:02,921 INFO L225 Difference]: With dead ends: 228 [2019-02-18 09:32:02,922 INFO L226 Difference]: Without dead ends: 227 [2019-02-18 09:32:02,923 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 516 GetRequests, 294 SyntacticMatches, 48 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21828 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=12699, Invalid=18101, Unknown=0, NotChecked=0, Total=30800 [2019-02-18 09:32:02,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2019-02-18 09:32:02,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 226. [2019-02-18 09:32:02,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2019-02-18 09:32:02,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 226 transitions. [2019-02-18 09:32:02,927 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 226 transitions. Word has length 222 [2019-02-18 09:32:02,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:32:02,927 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 226 transitions. [2019-02-18 09:32:02,927 INFO L481 AbstractCegarLoop]: Interpolant automaton has 150 states. [2019-02-18 09:32:02,927 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 226 transitions. [2019-02-18 09:32:02,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2019-02-18 09:32:02,928 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:32:02,928 INFO L402 BasicCegarLoop]: trace histogram [75, 74, 74, 1, 1] [2019-02-18 09:32:02,929 INFO L423 AbstractCegarLoop]: === Iteration 75 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:32:02,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:32:02,929 INFO L82 PathProgramCache]: Analyzing trace with hash 2125057952, now seen corresponding path program 74 times [2019-02-18 09:32:02,929 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:32:02,930 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:32:02,930 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:32:02,930 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:32:02,930 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:32:02,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:32:05,480 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 0 proven. 8251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:32:05,480 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:32:05,480 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:32:05,480 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:32:05,480 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:32:05,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:32:05,481 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:32:05,489 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:32:05,489 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:32:05,809 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 75 check-sat command(s) [2019-02-18 09:32:05,809 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:32:05,817 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:32:05,819 INFO L478 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 6 treesize of output 5 [2019-02-18 09:32:05,819 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:32:05,831 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:32:05,831 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:32:09,189 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 0 proven. 8251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:32:09,189 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:32:13,346 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 0 proven. 8251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:32:13,365 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:32:13,366 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 175 [2019-02-18 09:32:13,366 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:32:13,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2019-02-18 09:32:13,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2019-02-18 09:32:13,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12801, Invalid=18351, Unknown=0, NotChecked=0, Total=31152 [2019-02-18 09:32:13,368 INFO L87 Difference]: Start difference. First operand 226 states and 226 transitions. Second operand 152 states. [2019-02-18 09:32:13,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:32:13,947 INFO L93 Difference]: Finished difference Result 231 states and 231 transitions. [2019-02-18 09:32:13,947 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2019-02-18 09:32:13,947 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 225 [2019-02-18 09:32:13,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:32:13,948 INFO L225 Difference]: With dead ends: 231 [2019-02-18 09:32:13,948 INFO L226 Difference]: Without dead ends: 230 [2019-02-18 09:32:13,949 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 298 SyntacticMatches, 50 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22325 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=12801, Invalid=18351, Unknown=0, NotChecked=0, Total=31152 [2019-02-18 09:32:13,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2019-02-18 09:32:13,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 229. [2019-02-18 09:32:13,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2019-02-18 09:32:13,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 229 transitions. [2019-02-18 09:32:13,955 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 229 transitions. Word has length 225 [2019-02-18 09:32:13,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:32:13,956 INFO L480 AbstractCegarLoop]: Abstraction has 229 states and 229 transitions. [2019-02-18 09:32:13,956 INFO L481 AbstractCegarLoop]: Interpolant automaton has 152 states. [2019-02-18 09:32:13,956 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 229 transitions. [2019-02-18 09:32:13,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2019-02-18 09:32:13,957 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:32:13,957 INFO L402 BasicCegarLoop]: trace histogram [76, 75, 75, 1, 1] [2019-02-18 09:32:13,957 INFO L423 AbstractCegarLoop]: === Iteration 76 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:32:13,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:32:13,958 INFO L82 PathProgramCache]: Analyzing trace with hash -216453492, now seen corresponding path program 75 times [2019-02-18 09:32:13,958 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:32:13,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:32:13,958 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:32:13,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:32:13,959 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:32:13,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:32:16,646 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 0 proven. 8475 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:32:16,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:32:16,647 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:32:16,647 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:32:16,647 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:32:16,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:32:16,647 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:32:16,656 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:32:16,656 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:32:16,729 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:32:16,729 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:32:16,737 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:32:16,739 INFO L478 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 6 treesize of output 5 [2019-02-18 09:32:16,740 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:32:16,750 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:32:16,750 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:32:20,286 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 0 proven. 8475 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:32:20,287 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:32:24,478 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 0 proven. 8475 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:32:24,500 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:32:24,500 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 176 [2019-02-18 09:32:24,500 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:32:24,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 154 states [2019-02-18 09:32:24,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2019-02-18 09:32:24,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12903, Invalid=18603, Unknown=0, NotChecked=0, Total=31506 [2019-02-18 09:32:24,503 INFO L87 Difference]: Start difference. First operand 229 states and 229 transitions. Second operand 154 states. [2019-02-18 09:32:25,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:32:25,166 INFO L93 Difference]: Finished difference Result 234 states and 234 transitions. [2019-02-18 09:32:25,166 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2019-02-18 09:32:25,166 INFO L78 Accepts]: Start accepts. Automaton has 154 states. Word has length 228 [2019-02-18 09:32:25,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:32:25,168 INFO L225 Difference]: With dead ends: 234 [2019-02-18 09:32:25,168 INFO L226 Difference]: Without dead ends: 233 [2019-02-18 09:32:25,169 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 302 SyntacticMatches, 52 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22822 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=12903, Invalid=18603, Unknown=0, NotChecked=0, Total=31506 [2019-02-18 09:32:25,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2019-02-18 09:32:25,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 232. [2019-02-18 09:32:25,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2019-02-18 09:32:25,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 232 transitions. [2019-02-18 09:32:25,175 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 232 transitions. Word has length 228 [2019-02-18 09:32:25,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:32:25,175 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 232 transitions. [2019-02-18 09:32:25,175 INFO L481 AbstractCegarLoop]: Interpolant automaton has 154 states. [2019-02-18 09:32:25,175 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 232 transitions. [2019-02-18 09:32:25,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2019-02-18 09:32:25,176 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:32:25,176 INFO L402 BasicCegarLoop]: trace histogram [77, 76, 76, 1, 1] [2019-02-18 09:32:25,177 INFO L423 AbstractCegarLoop]: === Iteration 77 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:32:25,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:32:25,177 INFO L82 PathProgramCache]: Analyzing trace with hash -1620027360, now seen corresponding path program 76 times [2019-02-18 09:32:25,177 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:32:25,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:32:25,178 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:32:25,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:32:25,178 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:32:25,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:32:27,872 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 0 proven. 8702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:32:27,873 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:32:27,873 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:32:27,873 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:32:27,873 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:32:27,873 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:32:27,873 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:32:27,881 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:32:27,882 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:32:27,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:32:27,951 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:32:27,954 INFO L478 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 6 treesize of output 5 [2019-02-18 09:32:27,954 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:32:27,963 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:32:27,963 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:32:31,448 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 0 proven. 8702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:32:31,448 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:32:35,587 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 0 proven. 8702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:32:35,606 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:32:35,606 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 177 [2019-02-18 09:32:35,606 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:32:35,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 156 states [2019-02-18 09:32:35,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 156 interpolants. [2019-02-18 09:32:35,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13005, Invalid=18857, Unknown=0, NotChecked=0, Total=31862 [2019-02-18 09:32:35,609 INFO L87 Difference]: Start difference. First operand 232 states and 232 transitions. Second operand 156 states. [2019-02-18 09:32:36,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:32:36,184 INFO L93 Difference]: Finished difference Result 237 states and 237 transitions. [2019-02-18 09:32:36,184 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2019-02-18 09:32:36,184 INFO L78 Accepts]: Start accepts. Automaton has 156 states. Word has length 231 [2019-02-18 09:32:36,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:32:36,185 INFO L225 Difference]: With dead ends: 237 [2019-02-18 09:32:36,185 INFO L226 Difference]: Without dead ends: 236 [2019-02-18 09:32:36,186 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 537 GetRequests, 306 SyntacticMatches, 54 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23319 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=13005, Invalid=18857, Unknown=0, NotChecked=0, Total=31862 [2019-02-18 09:32:36,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2019-02-18 09:32:36,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 235. [2019-02-18 09:32:36,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 235 states. [2019-02-18 09:32:36,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 235 transitions. [2019-02-18 09:32:36,191 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 235 transitions. Word has length 231 [2019-02-18 09:32:36,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:32:36,191 INFO L480 AbstractCegarLoop]: Abstraction has 235 states and 235 transitions. [2019-02-18 09:32:36,191 INFO L481 AbstractCegarLoop]: Interpolant automaton has 156 states. [2019-02-18 09:32:36,192 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 235 transitions. [2019-02-18 09:32:36,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2019-02-18 09:32:36,192 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:32:36,192 INFO L402 BasicCegarLoop]: trace histogram [78, 77, 77, 1, 1] [2019-02-18 09:32:36,193 INFO L423 AbstractCegarLoop]: === Iteration 78 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:32:36,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:32:36,193 INFO L82 PathProgramCache]: Analyzing trace with hash 312464908, now seen corresponding path program 77 times [2019-02-18 09:32:36,193 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:32:36,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:32:36,193 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:32:36,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:32:36,194 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:32:36,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:32:39,297 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 0 proven. 8932 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:32:39,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:32:39,298 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:32:39,298 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:32:39,298 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:32:39,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:32:39,298 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:32:39,306 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:32:39,306 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:32:39,683 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2019-02-18 09:32:39,683 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:32:39,691 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:32:39,694 INFO L478 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 6 treesize of output 5 [2019-02-18 09:32:39,695 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:32:39,706 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:32:39,707 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:32:42,988 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 0 proven. 8932 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:32:42,988 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:32:47,282 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 0 proven. 8932 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:32:47,301 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:32:47,302 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78, 78] total 178 [2019-02-18 09:32:47,302 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:32:47,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 158 states [2019-02-18 09:32:47,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2019-02-18 09:32:47,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13107, Invalid=19113, Unknown=0, NotChecked=0, Total=32220 [2019-02-18 09:32:47,304 INFO L87 Difference]: Start difference. First operand 235 states and 235 transitions. Second operand 158 states. [2019-02-18 09:32:47,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:32:47,966 INFO L93 Difference]: Finished difference Result 240 states and 240 transitions. [2019-02-18 09:32:47,966 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2019-02-18 09:32:47,966 INFO L78 Accepts]: Start accepts. Automaton has 158 states. Word has length 234 [2019-02-18 09:32:47,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:32:47,967 INFO L225 Difference]: With dead ends: 240 [2019-02-18 09:32:47,967 INFO L226 Difference]: Without dead ends: 239 [2019-02-18 09:32:47,968 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 544 GetRequests, 310 SyntacticMatches, 56 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23816 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=13107, Invalid=19113, Unknown=0, NotChecked=0, Total=32220 [2019-02-18 09:32:47,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2019-02-18 09:32:47,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 238. [2019-02-18 09:32:47,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2019-02-18 09:32:47,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 238 transitions. [2019-02-18 09:32:47,973 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 238 transitions. Word has length 234 [2019-02-18 09:32:47,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:32:47,973 INFO L480 AbstractCegarLoop]: Abstraction has 238 states and 238 transitions. [2019-02-18 09:32:47,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has 158 states. [2019-02-18 09:32:47,973 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 238 transitions. [2019-02-18 09:32:47,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2019-02-18 09:32:47,974 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:32:47,974 INFO L402 BasicCegarLoop]: trace histogram [79, 78, 78, 1, 1] [2019-02-18 09:32:47,974 INFO L423 AbstractCegarLoop]: === Iteration 79 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:32:47,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:32:47,974 INFO L82 PathProgramCache]: Analyzing trace with hash 1447985312, now seen corresponding path program 78 times [2019-02-18 09:32:47,974 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:32:47,975 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:32:47,975 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:32:47,975 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:32:47,975 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:32:48,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:32:51,018 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 0 proven. 9165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:32:51,019 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:32:51,019 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:32:51,019 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:32:51,019 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:32:51,019 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:32:51,019 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:32:51,027 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:32:51,027 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:32:51,105 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:32:51,105 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:32:51,113 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:32:51,115 INFO L478 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 6 treesize of output 5 [2019-02-18 09:32:51,116 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:32:51,125 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:32:51,125 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:32:54,846 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 0 proven. 9165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:32:54,847 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:32:59,094 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 0 proven. 9165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:32:59,113 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:32:59,113 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 179 [2019-02-18 09:32:59,113 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:32:59,114 INFO L459 AbstractCegarLoop]: Interpolant automaton has 160 states [2019-02-18 09:32:59,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2019-02-18 09:32:59,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13209, Invalid=19371, Unknown=0, NotChecked=0, Total=32580 [2019-02-18 09:32:59,115 INFO L87 Difference]: Start difference. First operand 238 states and 238 transitions. Second operand 160 states. [2019-02-18 09:32:59,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:32:59,728 INFO L93 Difference]: Finished difference Result 243 states and 243 transitions. [2019-02-18 09:32:59,728 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2019-02-18 09:32:59,729 INFO L78 Accepts]: Start accepts. Automaton has 160 states. Word has length 237 [2019-02-18 09:32:59,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:32:59,730 INFO L225 Difference]: With dead ends: 243 [2019-02-18 09:32:59,730 INFO L226 Difference]: Without dead ends: 242 [2019-02-18 09:32:59,731 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 551 GetRequests, 314 SyntacticMatches, 58 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24313 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=13209, Invalid=19371, Unknown=0, NotChecked=0, Total=32580 [2019-02-18 09:32:59,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2019-02-18 09:32:59,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 241. [2019-02-18 09:32:59,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2019-02-18 09:32:59,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 241 transitions. [2019-02-18 09:32:59,737 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 241 transitions. Word has length 237 [2019-02-18 09:32:59,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:32:59,737 INFO L480 AbstractCegarLoop]: Abstraction has 241 states and 241 transitions. [2019-02-18 09:32:59,737 INFO L481 AbstractCegarLoop]: Interpolant automaton has 160 states. [2019-02-18 09:32:59,738 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 241 transitions. [2019-02-18 09:32:59,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2019-02-18 09:32:59,739 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:32:59,739 INFO L402 BasicCegarLoop]: trace histogram [80, 79, 79, 1, 1] [2019-02-18 09:32:59,739 INFO L423 AbstractCegarLoop]: === Iteration 80 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:32:59,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:32:59,739 INFO L82 PathProgramCache]: Analyzing trace with hash -1721049716, now seen corresponding path program 79 times [2019-02-18 09:32:59,739 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:32:59,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:32:59,740 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:32:59,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:32:59,740 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:32:59,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:33:02,881 INFO L134 CoverageAnalysis]: Checked inductivity of 9401 backedges. 0 proven. 9401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:33:02,881 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:33:02,881 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:33:02,881 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:33:02,882 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:33:02,882 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:33:02,882 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:33:02,890 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:33:02,891 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:33:02,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:33:02,963 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:33:02,965 INFO L478 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 6 treesize of output 5 [2019-02-18 09:33:02,965 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:33:02,976 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:33:02,976 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:33:06,760 INFO L134 CoverageAnalysis]: Checked inductivity of 9401 backedges. 0 proven. 9401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:33:06,760 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:33:11,036 INFO L134 CoverageAnalysis]: Checked inductivity of 9401 backedges. 0 proven. 9401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:33:11,055 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:33:11,056 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 180 [2019-02-18 09:33:11,056 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:33:11,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 162 states [2019-02-18 09:33:11,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 162 interpolants. [2019-02-18 09:33:11,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13311, Invalid=19631, Unknown=0, NotChecked=0, Total=32942 [2019-02-18 09:33:11,058 INFO L87 Difference]: Start difference. First operand 241 states and 241 transitions. Second operand 162 states. [2019-02-18 09:33:11,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:33:11,644 INFO L93 Difference]: Finished difference Result 246 states and 246 transitions. [2019-02-18 09:33:11,644 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2019-02-18 09:33:11,645 INFO L78 Accepts]: Start accepts. Automaton has 162 states. Word has length 240 [2019-02-18 09:33:11,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:33:11,646 INFO L225 Difference]: With dead ends: 246 [2019-02-18 09:33:11,646 INFO L226 Difference]: Without dead ends: 245 [2019-02-18 09:33:11,646 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 558 GetRequests, 318 SyntacticMatches, 60 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24810 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=13311, Invalid=19631, Unknown=0, NotChecked=0, Total=32942 [2019-02-18 09:33:11,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2019-02-18 09:33:11,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 244. [2019-02-18 09:33:11,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2019-02-18 09:33:11,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 244 transitions. [2019-02-18 09:33:11,651 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 244 transitions. Word has length 240 [2019-02-18 09:33:11,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:33:11,651 INFO L480 AbstractCegarLoop]: Abstraction has 244 states and 244 transitions. [2019-02-18 09:33:11,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has 162 states. [2019-02-18 09:33:11,651 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 244 transitions. [2019-02-18 09:33:11,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2019-02-18 09:33:11,652 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:33:11,652 INFO L402 BasicCegarLoop]: trace histogram [81, 80, 80, 1, 1] [2019-02-18 09:33:11,652 INFO L423 AbstractCegarLoop]: === Iteration 81 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:33:11,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:33:11,652 INFO L82 PathProgramCache]: Analyzing trace with hash 1527531808, now seen corresponding path program 80 times [2019-02-18 09:33:11,652 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:33:11,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:33:11,653 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:33:11,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:33:11,653 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:33:11,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:33:15,013 INFO L134 CoverageAnalysis]: Checked inductivity of 9640 backedges. 0 proven. 9640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:33:15,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:33:15,013 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:33:15,013 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:33:15,013 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:33:15,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:33:15,013 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:33:15,022 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:33:15,022 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:33:15,421 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 81 check-sat command(s) [2019-02-18 09:33:15,421 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:33:15,429 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:33:15,431 INFO L478 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 6 treesize of output 5 [2019-02-18 09:33:15,432 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:33:15,446 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:33:15,447 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:33:19,030 INFO L134 CoverageAnalysis]: Checked inductivity of 9640 backedges. 0 proven. 9640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:33:19,031 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:33:23,303 INFO L134 CoverageAnalysis]: Checked inductivity of 9640 backedges. 0 proven. 9640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:33:23,322 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:33:23,322 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 181 [2019-02-18 09:33:23,322 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:33:23,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 164 states [2019-02-18 09:33:23,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2019-02-18 09:33:23,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13413, Invalid=19893, Unknown=0, NotChecked=0, Total=33306 [2019-02-18 09:33:23,325 INFO L87 Difference]: Start difference. First operand 244 states and 244 transitions. Second operand 164 states. [2019-02-18 09:33:23,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:33:23,917 INFO L93 Difference]: Finished difference Result 249 states and 249 transitions. [2019-02-18 09:33:23,917 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2019-02-18 09:33:23,917 INFO L78 Accepts]: Start accepts. Automaton has 164 states. Word has length 243 [2019-02-18 09:33:23,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:33:23,918 INFO L225 Difference]: With dead ends: 249 [2019-02-18 09:33:23,918 INFO L226 Difference]: Without dead ends: 248 [2019-02-18 09:33:23,919 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 565 GetRequests, 322 SyntacticMatches, 62 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25307 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=13413, Invalid=19893, Unknown=0, NotChecked=0, Total=33306 [2019-02-18 09:33:23,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2019-02-18 09:33:23,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 247. [2019-02-18 09:33:23,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2019-02-18 09:33:23,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 247 transitions. [2019-02-18 09:33:23,923 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 247 transitions. Word has length 243 [2019-02-18 09:33:23,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:33:23,924 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 247 transitions. [2019-02-18 09:33:23,924 INFO L481 AbstractCegarLoop]: Interpolant automaton has 164 states. [2019-02-18 09:33:23,924 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 247 transitions. [2019-02-18 09:33:23,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2019-02-18 09:33:23,924 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:33:23,925 INFO L402 BasicCegarLoop]: trace histogram [82, 81, 81, 1, 1] [2019-02-18 09:33:23,925 INFO L423 AbstractCegarLoop]: === Iteration 82 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:33:23,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:33:23,925 INFO L82 PathProgramCache]: Analyzing trace with hash 1521632524, now seen corresponding path program 81 times [2019-02-18 09:33:23,925 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:33:23,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:33:23,926 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:33:23,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:33:23,926 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:33:23,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:33:27,193 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 0 proven. 9882 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:33:27,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:33:27,194 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:33:27,194 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:33:27,194 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:33:27,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:33:27,194 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:33:27,203 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:33:27,203 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:33:27,283 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:33:27,284 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:33:27,292 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:33:27,298 INFO L478 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 6 treesize of output 5 [2019-02-18 09:33:27,298 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:33:27,304 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:33:27,304 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:33:31,093 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 0 proven. 9882 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:33:31,093 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:33:35,350 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 0 proven. 9882 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:33:35,369 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:33:35,369 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82, 82] total 182 [2019-02-18 09:33:35,369 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:33:35,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 166 states [2019-02-18 09:33:35,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 166 interpolants. [2019-02-18 09:33:35,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13515, Invalid=20157, Unknown=0, NotChecked=0, Total=33672 [2019-02-18 09:33:35,373 INFO L87 Difference]: Start difference. First operand 247 states and 247 transitions. Second operand 166 states. [2019-02-18 09:33:35,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:33:35,975 INFO L93 Difference]: Finished difference Result 252 states and 252 transitions. [2019-02-18 09:33:35,975 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2019-02-18 09:33:35,975 INFO L78 Accepts]: Start accepts. Automaton has 166 states. Word has length 246 [2019-02-18 09:33:35,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:33:35,977 INFO L225 Difference]: With dead ends: 252 [2019-02-18 09:33:35,977 INFO L226 Difference]: Without dead ends: 251 [2019-02-18 09:33:35,978 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 326 SyntacticMatches, 64 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25804 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=13515, Invalid=20157, Unknown=0, NotChecked=0, Total=33672 [2019-02-18 09:33:35,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2019-02-18 09:33:35,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 250. [2019-02-18 09:33:35,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 250 states. [2019-02-18 09:33:35,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 250 transitions. [2019-02-18 09:33:35,982 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 250 transitions. Word has length 246 [2019-02-18 09:33:35,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:33:35,982 INFO L480 AbstractCegarLoop]: Abstraction has 250 states and 250 transitions. [2019-02-18 09:33:35,982 INFO L481 AbstractCegarLoop]: Interpolant automaton has 166 states. [2019-02-18 09:33:35,982 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 250 transitions. [2019-02-18 09:33:35,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2019-02-18 09:33:35,983 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:33:35,983 INFO L402 BasicCegarLoop]: trace histogram [83, 82, 82, 1, 1] [2019-02-18 09:33:35,983 INFO L423 AbstractCegarLoop]: === Iteration 83 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:33:35,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:33:35,983 INFO L82 PathProgramCache]: Analyzing trace with hash 1869722016, now seen corresponding path program 82 times [2019-02-18 09:33:35,984 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:33:35,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:33:35,984 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:33:35,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:33:35,984 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:33:36,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:33:39,103 INFO L134 CoverageAnalysis]: Checked inductivity of 10127 backedges. 0 proven. 10127 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:33:39,103 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:33:39,103 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:33:39,104 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:33:39,104 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:33:39,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:33:39,104 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:33:39,113 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:33:39,113 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:33:39,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:33:39,186 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:33:39,189 INFO L478 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 6 treesize of output 5 [2019-02-18 09:33:39,189 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:33:39,199 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:33:39,199 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:33:43,174 INFO L134 CoverageAnalysis]: Checked inductivity of 10127 backedges. 0 proven. 10127 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:33:43,174 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:33:47,543 INFO L134 CoverageAnalysis]: Checked inductivity of 10127 backedges. 0 proven. 10127 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:33:47,561 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:33:47,562 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 183 [2019-02-18 09:33:47,562 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:33:47,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 168 states [2019-02-18 09:33:47,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 168 interpolants. [2019-02-18 09:33:47,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13617, Invalid=20423, Unknown=0, NotChecked=0, Total=34040 [2019-02-18 09:33:47,565 INFO L87 Difference]: Start difference. First operand 250 states and 250 transitions. Second operand 168 states. [2019-02-18 09:33:48,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:33:48,175 INFO L93 Difference]: Finished difference Result 255 states and 255 transitions. [2019-02-18 09:33:48,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2019-02-18 09:33:48,175 INFO L78 Accepts]: Start accepts. Automaton has 168 states. Word has length 249 [2019-02-18 09:33:48,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:33:48,176 INFO L225 Difference]: With dead ends: 255 [2019-02-18 09:33:48,177 INFO L226 Difference]: Without dead ends: 254 [2019-02-18 09:33:48,178 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 579 GetRequests, 330 SyntacticMatches, 66 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26301 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=13617, Invalid=20423, Unknown=0, NotChecked=0, Total=34040 [2019-02-18 09:33:48,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2019-02-18 09:33:48,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 253. [2019-02-18 09:33:48,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 253 states. [2019-02-18 09:33:48,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 253 transitions. [2019-02-18 09:33:48,184 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 253 transitions. Word has length 249 [2019-02-18 09:33:48,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:33:48,184 INFO L480 AbstractCegarLoop]: Abstraction has 253 states and 253 transitions. [2019-02-18 09:33:48,184 INFO L481 AbstractCegarLoop]: Interpolant automaton has 168 states. [2019-02-18 09:33:48,185 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 253 transitions. [2019-02-18 09:33:48,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2019-02-18 09:33:48,186 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:33:48,186 INFO L402 BasicCegarLoop]: trace histogram [84, 83, 83, 1, 1] [2019-02-18 09:33:48,186 INFO L423 AbstractCegarLoop]: === Iteration 84 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:33:48,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:33:48,186 INFO L82 PathProgramCache]: Analyzing trace with hash -542241652, now seen corresponding path program 83 times [2019-02-18 09:33:48,186 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:33:48,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:33:48,187 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:33:48,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:33:48,187 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:33:48,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:33:51,737 INFO L134 CoverageAnalysis]: Checked inductivity of 10375 backedges. 0 proven. 10375 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:33:51,737 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:33:51,738 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:33:51,738 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:33:51,738 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:33:51,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:33:51,738 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:33:51,747 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:33:51,747 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:33:52,183 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 84 check-sat command(s) [2019-02-18 09:33:52,184 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:33:52,193 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:33:52,195 INFO L478 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 6 treesize of output 5 [2019-02-18 09:33:52,195 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:33:52,204 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:33:52,204 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:33:56,407 INFO L134 CoverageAnalysis]: Checked inductivity of 10375 backedges. 0 proven. 10375 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:33:56,408 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:34:00,783 INFO L134 CoverageAnalysis]: Checked inductivity of 10375 backedges. 0 proven. 10375 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:34:00,804 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:34:00,804 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 184 [2019-02-18 09:34:00,804 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:34:00,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 170 states [2019-02-18 09:34:00,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 170 interpolants. [2019-02-18 09:34:00,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13719, Invalid=20691, Unknown=0, NotChecked=0, Total=34410 [2019-02-18 09:34:00,807 INFO L87 Difference]: Start difference. First operand 253 states and 253 transitions. Second operand 170 states. [2019-02-18 09:34:01,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:34:01,451 INFO L93 Difference]: Finished difference Result 258 states and 258 transitions. [2019-02-18 09:34:01,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2019-02-18 09:34:01,451 INFO L78 Accepts]: Start accepts. Automaton has 170 states. Word has length 252 [2019-02-18 09:34:01,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:34:01,453 INFO L225 Difference]: With dead ends: 258 [2019-02-18 09:34:01,453 INFO L226 Difference]: Without dead ends: 257 [2019-02-18 09:34:01,454 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 334 SyntacticMatches, 68 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26798 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=13719, Invalid=20691, Unknown=0, NotChecked=0, Total=34410 [2019-02-18 09:34:01,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2019-02-18 09:34:01,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 256. [2019-02-18 09:34:01,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2019-02-18 09:34:01,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 256 transitions. [2019-02-18 09:34:01,458 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 256 transitions. Word has length 252 [2019-02-18 09:34:01,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:34:01,459 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 256 transitions. [2019-02-18 09:34:01,459 INFO L481 AbstractCegarLoop]: Interpolant automaton has 170 states. [2019-02-18 09:34:01,459 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 256 transitions. [2019-02-18 09:34:01,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2019-02-18 09:34:01,459 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:34:01,460 INFO L402 BasicCegarLoop]: trace histogram [85, 84, 84, 1, 1] [2019-02-18 09:34:01,460 INFO L423 AbstractCegarLoop]: === Iteration 85 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:34:01,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:34:01,460 INFO L82 PathProgramCache]: Analyzing trace with hash -549012960, now seen corresponding path program 84 times [2019-02-18 09:34:01,460 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:34:01,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:34:01,461 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:34:01,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:34:01,461 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:34:01,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:34:04,700 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 0 proven. 10626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:34:04,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:34:04,700 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:34:04,700 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:34:04,700 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:34:04,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:34:04,700 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:34:04,710 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:34:04,711 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:34:04,790 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:34:04,790 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:34:04,799 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:34:04,801 INFO L478 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 6 treesize of output 5 [2019-02-18 09:34:04,801 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:34:04,809 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:34:04,809 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:34:08,993 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 0 proven. 10626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:34:08,993 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:34:13,258 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 0 proven. 10626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:34:13,277 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:34:13,277 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 185 [2019-02-18 09:34:13,277 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:34:13,278 INFO L459 AbstractCegarLoop]: Interpolant automaton has 172 states [2019-02-18 09:34:13,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2019-02-18 09:34:13,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13821, Invalid=20961, Unknown=0, NotChecked=0, Total=34782 [2019-02-18 09:34:13,281 INFO L87 Difference]: Start difference. First operand 256 states and 256 transitions. Second operand 172 states. [2019-02-18 09:34:13,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:34:13,954 INFO L93 Difference]: Finished difference Result 261 states and 261 transitions. [2019-02-18 09:34:13,954 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2019-02-18 09:34:13,954 INFO L78 Accepts]: Start accepts. Automaton has 172 states. Word has length 255 [2019-02-18 09:34:13,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:34:13,956 INFO L225 Difference]: With dead ends: 261 [2019-02-18 09:34:13,956 INFO L226 Difference]: Without dead ends: 260 [2019-02-18 09:34:13,957 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 593 GetRequests, 338 SyntacticMatches, 70 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27295 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=13821, Invalid=20961, Unknown=0, NotChecked=0, Total=34782 [2019-02-18 09:34:13,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2019-02-18 09:34:13,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 259. [2019-02-18 09:34:13,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2019-02-18 09:34:13,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 259 transitions. [2019-02-18 09:34:13,962 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 259 transitions. Word has length 255 [2019-02-18 09:34:13,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:34:13,962 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 259 transitions. [2019-02-18 09:34:13,963 INFO L481 AbstractCegarLoop]: Interpolant automaton has 172 states. [2019-02-18 09:34:13,963 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 259 transitions. [2019-02-18 09:34:13,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2019-02-18 09:34:13,964 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:34:13,964 INFO L402 BasicCegarLoop]: trace histogram [86, 85, 85, 1, 1] [2019-02-18 09:34:13,964 INFO L423 AbstractCegarLoop]: === Iteration 86 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:34:13,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:34:13,964 INFO L82 PathProgramCache]: Analyzing trace with hash -409586676, now seen corresponding path program 85 times [2019-02-18 09:34:13,964 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:34:13,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:34:13,965 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:34:13,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:34:13,965 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:34:14,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:34:17,481 INFO L134 CoverageAnalysis]: Checked inductivity of 10880 backedges. 0 proven. 10880 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:34:17,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:34:17,481 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:34:17,482 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:34:17,482 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:34:17,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:34:17,482 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:34:17,492 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:34:17,492 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:34:17,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:34:17,570 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:34:17,576 INFO L478 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 6 treesize of output 5 [2019-02-18 09:34:17,576 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:34:17,586 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:34:17,586 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:34:21,862 INFO L134 CoverageAnalysis]: Checked inductivity of 10880 backedges. 0 proven. 10880 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:34:21,862 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:34:26,183 INFO L134 CoverageAnalysis]: Checked inductivity of 10880 backedges. 0 proven. 10880 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:34:26,201 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:34:26,201 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86, 86] total 186 [2019-02-18 09:34:26,202 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:34:26,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 174 states [2019-02-18 09:34:26,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 174 interpolants. [2019-02-18 09:34:26,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13923, Invalid=21233, Unknown=0, NotChecked=0, Total=35156 [2019-02-18 09:34:26,205 INFO L87 Difference]: Start difference. First operand 259 states and 259 transitions. Second operand 174 states. [2019-02-18 09:34:26,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:34:26,910 INFO L93 Difference]: Finished difference Result 264 states and 264 transitions. [2019-02-18 09:34:26,911 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2019-02-18 09:34:26,911 INFO L78 Accepts]: Start accepts. Automaton has 174 states. Word has length 258 [2019-02-18 09:34:26,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:34:26,912 INFO L225 Difference]: With dead ends: 264 [2019-02-18 09:34:26,912 INFO L226 Difference]: Without dead ends: 263 [2019-02-18 09:34:26,913 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 600 GetRequests, 342 SyntacticMatches, 72 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27792 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=13923, Invalid=21233, Unknown=0, NotChecked=0, Total=35156 [2019-02-18 09:34:26,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2019-02-18 09:34:26,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 262. [2019-02-18 09:34:26,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2019-02-18 09:34:26,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 262 transitions. [2019-02-18 09:34:26,919 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 262 transitions. Word has length 258 [2019-02-18 09:34:26,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:34:26,919 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 262 transitions. [2019-02-18 09:34:26,920 INFO L481 AbstractCegarLoop]: Interpolant automaton has 174 states. [2019-02-18 09:34:26,920 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 262 transitions. [2019-02-18 09:34:26,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2019-02-18 09:34:26,921 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:34:26,921 INFO L402 BasicCegarLoop]: trace histogram [87, 86, 86, 1, 1] [2019-02-18 09:34:26,921 INFO L423 AbstractCegarLoop]: === Iteration 87 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:34:26,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:34:26,922 INFO L82 PathProgramCache]: Analyzing trace with hash 5464736, now seen corresponding path program 86 times [2019-02-18 09:34:26,922 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:34:26,922 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:34:26,922 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:34:26,922 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:34:26,923 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:34:26,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:34:30,295 INFO L134 CoverageAnalysis]: Checked inductivity of 11137 backedges. 0 proven. 11137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:34:30,295 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:34:30,295 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:34:30,296 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:34:30,296 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:34:30,296 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:34:30,296 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:34:30,305 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:34:30,305 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:34:30,767 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 87 check-sat command(s) [2019-02-18 09:34:30,767 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:34:30,777 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:34:30,781 INFO L478 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 6 treesize of output 5 [2019-02-18 09:34:30,781 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:34:30,789 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:34:30,790 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:34:35,234 INFO L134 CoverageAnalysis]: Checked inductivity of 11137 backedges. 0 proven. 11137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:34:35,234 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:34:39,698 INFO L134 CoverageAnalysis]: Checked inductivity of 11137 backedges. 0 proven. 11137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:34:39,717 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:34:39,717 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 187 [2019-02-18 09:34:39,717 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:34:39,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 176 states [2019-02-18 09:34:39,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2019-02-18 09:34:39,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14025, Invalid=21507, Unknown=0, NotChecked=0, Total=35532 [2019-02-18 09:34:39,721 INFO L87 Difference]: Start difference. First operand 262 states and 262 transitions. Second operand 176 states. [2019-02-18 09:34:40,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:34:40,424 INFO L93 Difference]: Finished difference Result 267 states and 267 transitions. [2019-02-18 09:34:40,424 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2019-02-18 09:34:40,424 INFO L78 Accepts]: Start accepts. Automaton has 176 states. Word has length 261 [2019-02-18 09:34:40,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:34:40,426 INFO L225 Difference]: With dead ends: 267 [2019-02-18 09:34:40,426 INFO L226 Difference]: Without dead ends: 266 [2019-02-18 09:34:40,426 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 607 GetRequests, 346 SyntacticMatches, 74 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28289 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=14025, Invalid=21507, Unknown=0, NotChecked=0, Total=35532 [2019-02-18 09:34:40,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2019-02-18 09:34:40,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 265. [2019-02-18 09:34:40,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 265 states. [2019-02-18 09:34:40,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 265 transitions. [2019-02-18 09:34:40,431 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 265 transitions. Word has length 261 [2019-02-18 09:34:40,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:34:40,432 INFO L480 AbstractCegarLoop]: Abstraction has 265 states and 265 transitions. [2019-02-18 09:34:40,432 INFO L481 AbstractCegarLoop]: Interpolant automaton has 176 states. [2019-02-18 09:34:40,432 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 265 transitions. [2019-02-18 09:34:40,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2019-02-18 09:34:40,433 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:34:40,433 INFO L402 BasicCegarLoop]: trace histogram [88, 87, 87, 1, 1] [2019-02-18 09:34:40,433 INFO L423 AbstractCegarLoop]: === Iteration 88 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:34:40,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:34:40,434 INFO L82 PathProgramCache]: Analyzing trace with hash -408765556, now seen corresponding path program 87 times [2019-02-18 09:34:40,434 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:34:40,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:34:40,434 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:34:40,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:34:40,434 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:34:40,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:34:44,310 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 0 proven. 11397 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:34:44,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:34:44,310 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:34:44,310 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:34:44,310 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:34:44,311 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:34:44,311 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:34:44,319 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:34:44,319 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:34:44,406 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:34:44,406 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:34:44,416 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:34:44,418 INFO L478 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 6 treesize of output 5 [2019-02-18 09:34:44,418 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:34:44,426 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:34:44,427 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:34:48,850 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 0 proven. 11397 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:34:48,851 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:34:53,162 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 0 proven. 11397 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:34:53,183 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:34:53,183 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88, 88] total 188 [2019-02-18 09:34:53,184 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:34:53,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 178 states [2019-02-18 09:34:53,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 178 interpolants. [2019-02-18 09:34:53,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14127, Invalid=21783, Unknown=0, NotChecked=0, Total=35910 [2019-02-18 09:34:53,186 INFO L87 Difference]: Start difference. First operand 265 states and 265 transitions. Second operand 178 states. [2019-02-18 09:34:53,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:34:53,816 INFO L93 Difference]: Finished difference Result 270 states and 270 transitions. [2019-02-18 09:34:53,816 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2019-02-18 09:34:53,817 INFO L78 Accepts]: Start accepts. Automaton has 178 states. Word has length 264 [2019-02-18 09:34:53,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:34:53,818 INFO L225 Difference]: With dead ends: 270 [2019-02-18 09:34:53,818 INFO L226 Difference]: Without dead ends: 269 [2019-02-18 09:34:53,819 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 614 GetRequests, 350 SyntacticMatches, 76 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28786 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=14127, Invalid=21783, Unknown=0, NotChecked=0, Total=35910 [2019-02-18 09:34:53,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2019-02-18 09:34:53,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 268. [2019-02-18 09:34:53,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2019-02-18 09:34:53,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 268 transitions. [2019-02-18 09:34:53,823 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 268 transitions. Word has length 264 [2019-02-18 09:34:53,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:34:53,823 INFO L480 AbstractCegarLoop]: Abstraction has 268 states and 268 transitions. [2019-02-18 09:34:53,823 INFO L481 AbstractCegarLoop]: Interpolant automaton has 178 states. [2019-02-18 09:34:53,824 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 268 transitions. [2019-02-18 09:34:53,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2019-02-18 09:34:53,824 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:34:53,825 INFO L402 BasicCegarLoop]: trace histogram [89, 88, 88, 1, 1] [2019-02-18 09:34:53,825 INFO L423 AbstractCegarLoop]: === Iteration 89 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:34:53,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:34:53,825 INFO L82 PathProgramCache]: Analyzing trace with hash -1302353120, now seen corresponding path program 88 times [2019-02-18 09:34:53,825 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:34:53,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:34:53,826 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:34:53,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:34:53,826 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:34:53,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:34:57,745 INFO L134 CoverageAnalysis]: Checked inductivity of 11660 backedges. 0 proven. 11660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:34:57,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:34:57,746 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:34:57,746 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:34:57,746 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:34:57,746 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:34:57,746 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:34:57,755 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:34:57,755 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:34:57,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:34:57,836 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:34:57,839 INFO L478 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 6 treesize of output 5 [2019-02-18 09:34:57,839 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:34:57,848 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:34:57,848 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:35:02,326 INFO L134 CoverageAnalysis]: Checked inductivity of 11660 backedges. 0 proven. 11660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:35:02,326 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:35:06,611 INFO L134 CoverageAnalysis]: Checked inductivity of 11660 backedges. 0 proven. 11660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:35:06,632 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:35:06,632 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 189 [2019-02-18 09:35:06,632 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:35:06,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 180 states [2019-02-18 09:35:06,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 180 interpolants. [2019-02-18 09:35:06,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14229, Invalid=22061, Unknown=0, NotChecked=0, Total=36290 [2019-02-18 09:35:06,635 INFO L87 Difference]: Start difference. First operand 268 states and 268 transitions. Second operand 180 states. [2019-02-18 09:35:07,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:35:07,509 INFO L93 Difference]: Finished difference Result 273 states and 273 transitions. [2019-02-18 09:35:07,510 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2019-02-18 09:35:07,510 INFO L78 Accepts]: Start accepts. Automaton has 180 states. Word has length 267 [2019-02-18 09:35:07,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:35:07,511 INFO L225 Difference]: With dead ends: 273 [2019-02-18 09:35:07,511 INFO L226 Difference]: Without dead ends: 272 [2019-02-18 09:35:07,512 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 621 GetRequests, 354 SyntacticMatches, 78 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29283 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=14229, Invalid=22061, Unknown=0, NotChecked=0, Total=36290 [2019-02-18 09:35:07,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2019-02-18 09:35:07,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 271. [2019-02-18 09:35:07,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 271 states. [2019-02-18 09:35:07,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 271 transitions. [2019-02-18 09:35:07,517 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 271 transitions. Word has length 267 [2019-02-18 09:35:07,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:35:07,517 INFO L480 AbstractCegarLoop]: Abstraction has 271 states and 271 transitions. [2019-02-18 09:35:07,517 INFO L481 AbstractCegarLoop]: Interpolant automaton has 180 states. [2019-02-18 09:35:07,517 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 271 transitions. [2019-02-18 09:35:07,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2019-02-18 09:35:07,518 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:35:07,518 INFO L402 BasicCegarLoop]: trace histogram [90, 89, 89, 1, 1] [2019-02-18 09:35:07,519 INFO L423 AbstractCegarLoop]: === Iteration 90 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:35:07,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:35:07,519 INFO L82 PathProgramCache]: Analyzing trace with hash -1962171636, now seen corresponding path program 89 times [2019-02-18 09:35:07,519 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:35:07,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:35:07,519 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:35:07,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:35:07,520 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:35:07,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:35:11,263 INFO L134 CoverageAnalysis]: Checked inductivity of 11926 backedges. 0 proven. 11926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:35:11,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:35:11,263 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:35:11,263 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:35:11,263 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:35:11,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:35:11,263 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:35:11,271 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:35:11,271 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:35:11,780 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 90 check-sat command(s) [2019-02-18 09:35:11,781 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:35:11,791 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:35:11,793 INFO L478 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 6 treesize of output 5 [2019-02-18 09:35:11,793 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:35:11,803 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:35:11,803 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:35:16,348 INFO L134 CoverageAnalysis]: Checked inductivity of 11926 backedges. 0 proven. 11926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:35:16,349 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:35:20,795 INFO L134 CoverageAnalysis]: Checked inductivity of 11926 backedges. 0 proven. 11926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:35:20,816 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:35:20,816 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90, 90] total 190 [2019-02-18 09:35:20,816 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:35:20,816 INFO L459 AbstractCegarLoop]: Interpolant automaton has 182 states [2019-02-18 09:35:20,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 182 interpolants. [2019-02-18 09:35:20,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14331, Invalid=22341, Unknown=0, NotChecked=0, Total=36672 [2019-02-18 09:35:20,819 INFO L87 Difference]: Start difference. First operand 271 states and 271 transitions. Second operand 182 states. [2019-02-18 09:35:21,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:35:21,553 INFO L93 Difference]: Finished difference Result 276 states and 276 transitions. [2019-02-18 09:35:21,553 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2019-02-18 09:35:21,553 INFO L78 Accepts]: Start accepts. Automaton has 182 states. Word has length 270 [2019-02-18 09:35:21,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:35:21,555 INFO L225 Difference]: With dead ends: 276 [2019-02-18 09:35:21,555 INFO L226 Difference]: Without dead ends: 275 [2019-02-18 09:35:21,556 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 628 GetRequests, 358 SyntacticMatches, 80 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29780 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=14331, Invalid=22341, Unknown=0, NotChecked=0, Total=36672 [2019-02-18 09:35:21,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2019-02-18 09:35:21,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 274. [2019-02-18 09:35:21,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2019-02-18 09:35:21,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 274 transitions. [2019-02-18 09:35:21,561 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 274 transitions. Word has length 270 [2019-02-18 09:35:21,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:35:21,562 INFO L480 AbstractCegarLoop]: Abstraction has 274 states and 274 transitions. [2019-02-18 09:35:21,562 INFO L481 AbstractCegarLoop]: Interpolant automaton has 182 states. [2019-02-18 09:35:21,562 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 274 transitions. [2019-02-18 09:35:21,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2019-02-18 09:35:21,562 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:35:21,563 INFO L402 BasicCegarLoop]: trace histogram [91, 90, 90, 1, 1] [2019-02-18 09:35:21,563 INFO L423 AbstractCegarLoop]: === Iteration 91 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:35:21,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:35:21,563 INFO L82 PathProgramCache]: Analyzing trace with hash -550268000, now seen corresponding path program 90 times [2019-02-18 09:35:21,563 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:35:21,564 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:35:21,564 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:35:21,564 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:35:21,564 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:35:21,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:35:25,584 INFO L134 CoverageAnalysis]: Checked inductivity of 12195 backedges. 0 proven. 12195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:35:25,585 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:35:25,585 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:35:25,585 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:35:25,585 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:35:25,585 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:35:25,585 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:35:25,609 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:35:25,609 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:35:25,697 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:35:25,697 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:35:25,707 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:35:25,709 INFO L478 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 6 treesize of output 5 [2019-02-18 09:35:25,709 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:35:25,718 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:35:25,718 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:35:30,451 INFO L134 CoverageAnalysis]: Checked inductivity of 12195 backedges. 0 proven. 12195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:35:30,451 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:35:35,038 INFO L134 CoverageAnalysis]: Checked inductivity of 12195 backedges. 0 proven. 12195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:35:35,057 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:35:35,057 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 191 [2019-02-18 09:35:35,057 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:35:35,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 184 states [2019-02-18 09:35:35,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 184 interpolants. [2019-02-18 09:35:35,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14433, Invalid=22623, Unknown=0, NotChecked=0, Total=37056 [2019-02-18 09:35:35,060 INFO L87 Difference]: Start difference. First operand 274 states and 274 transitions. Second operand 184 states. [2019-02-18 09:35:35,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:35:35,802 INFO L93 Difference]: Finished difference Result 279 states and 279 transitions. [2019-02-18 09:35:35,802 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2019-02-18 09:35:35,802 INFO L78 Accepts]: Start accepts. Automaton has 184 states. Word has length 273 [2019-02-18 09:35:35,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:35:35,804 INFO L225 Difference]: With dead ends: 279 [2019-02-18 09:35:35,804 INFO L226 Difference]: Without dead ends: 278 [2019-02-18 09:35:35,805 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 635 GetRequests, 362 SyntacticMatches, 82 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30277 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=14433, Invalid=22623, Unknown=0, NotChecked=0, Total=37056 [2019-02-18 09:35:35,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2019-02-18 09:35:35,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 277. [2019-02-18 09:35:35,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2019-02-18 09:35:35,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 277 transitions. [2019-02-18 09:35:35,811 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 277 transitions. Word has length 273 [2019-02-18 09:35:35,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:35:35,811 INFO L480 AbstractCegarLoop]: Abstraction has 277 states and 277 transitions. [2019-02-18 09:35:35,811 INFO L481 AbstractCegarLoop]: Interpolant automaton has 184 states. [2019-02-18 09:35:35,811 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 277 transitions. [2019-02-18 09:35:35,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2019-02-18 09:35:35,812 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:35:35,812 INFO L402 BasicCegarLoop]: trace histogram [92, 91, 91, 1, 1] [2019-02-18 09:35:35,812 INFO L423 AbstractCegarLoop]: === Iteration 92 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:35:35,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:35:35,813 INFO L82 PathProgramCache]: Analyzing trace with hash 856222348, now seen corresponding path program 91 times [2019-02-18 09:35:35,813 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:35:35,813 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:35:35,813 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:35:35,813 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:35:35,813 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:35:35,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:35:39,857 INFO L134 CoverageAnalysis]: Checked inductivity of 12467 backedges. 0 proven. 12467 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:35:39,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:35:39,858 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:35:39,858 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:35:39,858 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:35:39,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:35:39,858 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:35:39,867 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:35:39,867 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:35:39,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:35:39,949 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:35:39,951 INFO L478 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 6 treesize of output 5 [2019-02-18 09:35:39,952 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:35:39,962 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:35:39,962 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:35:44,867 INFO L134 CoverageAnalysis]: Checked inductivity of 12467 backedges. 0 proven. 12467 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:35:44,867 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:35:49,254 INFO L134 CoverageAnalysis]: Checked inductivity of 12467 backedges. 0 proven. 12467 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:35:49,273 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:35:49,273 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92, 92] total 192 [2019-02-18 09:35:49,273 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:35:49,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 186 states [2019-02-18 09:35:49,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 186 interpolants. [2019-02-18 09:35:49,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14535, Invalid=22907, Unknown=0, NotChecked=0, Total=37442 [2019-02-18 09:35:49,276 INFO L87 Difference]: Start difference. First operand 277 states and 277 transitions. Second operand 186 states. [2019-02-18 09:35:49,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:35:49,984 INFO L93 Difference]: Finished difference Result 282 states and 282 transitions. [2019-02-18 09:35:49,989 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2019-02-18 09:35:49,989 INFO L78 Accepts]: Start accepts. Automaton has 186 states. Word has length 276 [2019-02-18 09:35:49,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:35:49,990 INFO L225 Difference]: With dead ends: 282 [2019-02-18 09:35:49,990 INFO L226 Difference]: Without dead ends: 281 [2019-02-18 09:35:49,991 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 642 GetRequests, 366 SyntacticMatches, 84 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30774 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=14535, Invalid=22907, Unknown=0, NotChecked=0, Total=37442 [2019-02-18 09:35:49,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2019-02-18 09:35:49,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 280. [2019-02-18 09:35:49,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2019-02-18 09:35:49,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 280 transitions. [2019-02-18 09:35:49,995 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 280 transitions. Word has length 276 [2019-02-18 09:35:49,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:35:49,996 INFO L480 AbstractCegarLoop]: Abstraction has 280 states and 280 transitions. [2019-02-18 09:35:49,996 INFO L481 AbstractCegarLoop]: Interpolant automaton has 186 states. [2019-02-18 09:35:49,996 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 280 transitions. [2019-02-18 09:35:49,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2019-02-18 09:35:49,996 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:35:49,997 INFO L402 BasicCegarLoop]: trace histogram [93, 92, 92, 1, 1] [2019-02-18 09:35:49,997 INFO L423 AbstractCegarLoop]: === Iteration 93 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:35:49,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:35:49,997 INFO L82 PathProgramCache]: Analyzing trace with hash -90760160, now seen corresponding path program 92 times [2019-02-18 09:35:49,997 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:35:49,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:35:49,998 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:35:49,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:35:49,998 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:35:50,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:35:54,760 INFO L134 CoverageAnalysis]: Checked inductivity of 12742 backedges. 0 proven. 12742 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:35:54,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:35:54,760 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:35:54,761 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:35:54,761 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:35:54,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:35:54,761 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:35:54,769 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:35:54,770 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:35:55,317 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 93 check-sat command(s) [2019-02-18 09:35:55,317 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:35:55,326 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:35:55,328 INFO L478 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 6 treesize of output 5 [2019-02-18 09:35:55,328 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:35:55,339 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:35:55,339 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:36:00,232 INFO L134 CoverageAnalysis]: Checked inductivity of 12742 backedges. 0 proven. 12742 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:36:00,232 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:36:04,798 INFO L134 CoverageAnalysis]: Checked inductivity of 12742 backedges. 0 proven. 12742 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:36:04,817 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:36:04,817 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 193 [2019-02-18 09:36:04,817 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:36:04,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 188 states [2019-02-18 09:36:04,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 188 interpolants. [2019-02-18 09:36:04,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14637, Invalid=23193, Unknown=0, NotChecked=0, Total=37830 [2019-02-18 09:36:04,820 INFO L87 Difference]: Start difference. First operand 280 states and 280 transitions. Second operand 188 states. [2019-02-18 09:36:05,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:36:05,611 INFO L93 Difference]: Finished difference Result 285 states and 285 transitions. [2019-02-18 09:36:05,611 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2019-02-18 09:36:05,612 INFO L78 Accepts]: Start accepts. Automaton has 188 states. Word has length 279 [2019-02-18 09:36:05,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:36:05,613 INFO L225 Difference]: With dead ends: 285 [2019-02-18 09:36:05,613 INFO L226 Difference]: Without dead ends: 284 [2019-02-18 09:36:05,614 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 649 GetRequests, 370 SyntacticMatches, 86 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31271 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=14637, Invalid=23193, Unknown=0, NotChecked=0, Total=37830 [2019-02-18 09:36:05,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2019-02-18 09:36:05,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 283. [2019-02-18 09:36:05,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 283 states. [2019-02-18 09:36:05,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 283 transitions. [2019-02-18 09:36:05,620 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 283 transitions. Word has length 279 [2019-02-18 09:36:05,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:36:05,621 INFO L480 AbstractCegarLoop]: Abstraction has 283 states and 283 transitions. [2019-02-18 09:36:05,621 INFO L481 AbstractCegarLoop]: Interpolant automaton has 188 states. [2019-02-18 09:36:05,621 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 283 transitions. [2019-02-18 09:36:05,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 283 [2019-02-18 09:36:05,621 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:36:05,622 INFO L402 BasicCegarLoop]: trace histogram [94, 93, 93, 1, 1] [2019-02-18 09:36:05,622 INFO L423 AbstractCegarLoop]: === Iteration 94 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:36:05,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:36:05,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1993511436, now seen corresponding path program 93 times [2019-02-18 09:36:05,622 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:36:05,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:36:05,623 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:36:05,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:36:05,623 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:36:05,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:36:09,616 INFO L134 CoverageAnalysis]: Checked inductivity of 13020 backedges. 0 proven. 13020 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:36:09,617 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:36:09,617 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:36:09,617 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:36:09,617 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:36:09,617 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:36:09,617 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:36:09,632 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:36:09,632 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:36:09,727 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:36:09,727 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:36:09,739 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:36:09,751 INFO L478 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 6 treesize of output 5 [2019-02-18 09:36:09,751 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:36:09,759 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:36:09,759 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:36:14,730 INFO L134 CoverageAnalysis]: Checked inductivity of 13020 backedges. 0 proven. 13020 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:36:14,730 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:36:19,222 INFO L134 CoverageAnalysis]: Checked inductivity of 13020 backedges. 0 proven. 13020 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:36:19,243 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:36:19,243 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94, 94] total 194 [2019-02-18 09:36:19,243 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:36:19,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 190 states [2019-02-18 09:36:19,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2019-02-18 09:36:19,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14739, Invalid=23481, Unknown=0, NotChecked=0, Total=38220 [2019-02-18 09:36:19,247 INFO L87 Difference]: Start difference. First operand 283 states and 283 transitions. Second operand 190 states. [2019-02-18 09:36:20,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:36:20,061 INFO L93 Difference]: Finished difference Result 288 states and 288 transitions. [2019-02-18 09:36:20,062 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2019-02-18 09:36:20,062 INFO L78 Accepts]: Start accepts. Automaton has 190 states. Word has length 282 [2019-02-18 09:36:20,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:36:20,064 INFO L225 Difference]: With dead ends: 288 [2019-02-18 09:36:20,064 INFO L226 Difference]: Without dead ends: 287 [2019-02-18 09:36:20,065 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 656 GetRequests, 374 SyntacticMatches, 88 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31768 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=14739, Invalid=23481, Unknown=0, NotChecked=0, Total=38220 [2019-02-18 09:36:20,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2019-02-18 09:36:20,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 286. [2019-02-18 09:36:20,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2019-02-18 09:36:20,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 286 transitions. [2019-02-18 09:36:20,070 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 286 transitions. Word has length 282 [2019-02-18 09:36:20,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:36:20,070 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 286 transitions. [2019-02-18 09:36:20,070 INFO L481 AbstractCegarLoop]: Interpolant automaton has 190 states. [2019-02-18 09:36:20,070 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 286 transitions. [2019-02-18 09:36:20,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2019-02-18 09:36:20,071 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:36:20,071 INFO L402 BasicCegarLoop]: trace histogram [95, 94, 94, 1, 1] [2019-02-18 09:36:20,072 INFO L423 AbstractCegarLoop]: === Iteration 95 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:36:20,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:36:20,072 INFO L82 PathProgramCache]: Analyzing trace with hash -2108537696, now seen corresponding path program 94 times [2019-02-18 09:36:20,072 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:36:20,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:36:20,072 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:36:20,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:36:20,073 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:36:20,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:36:24,308 INFO L134 CoverageAnalysis]: Checked inductivity of 13301 backedges. 0 proven. 13301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:36:24,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:36:24,309 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:36:24,309 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:36:24,309 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:36:24,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:36:24,309 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:36:24,318 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:36:24,318 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:36:24,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:36:24,404 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:36:24,408 INFO L478 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 6 treesize of output 5 [2019-02-18 09:36:24,408 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:36:24,419 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:36:24,419 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:36:29,479 INFO L134 CoverageAnalysis]: Checked inductivity of 13301 backedges. 0 proven. 13301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:36:29,479 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:36:33,723 INFO L134 CoverageAnalysis]: Checked inductivity of 13301 backedges. 0 proven. 13301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:36:33,742 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:36:33,742 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 195 [2019-02-18 09:36:33,742 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:36:33,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 192 states [2019-02-18 09:36:33,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2019-02-18 09:36:33,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14841, Invalid=23771, Unknown=0, NotChecked=0, Total=38612 [2019-02-18 09:36:33,746 INFO L87 Difference]: Start difference. First operand 286 states and 286 transitions. Second operand 192 states. [2019-02-18 09:36:34,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:36:34,504 INFO L93 Difference]: Finished difference Result 291 states and 291 transitions. [2019-02-18 09:36:34,504 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2019-02-18 09:36:34,504 INFO L78 Accepts]: Start accepts. Automaton has 192 states. Word has length 285 [2019-02-18 09:36:34,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:36:34,506 INFO L225 Difference]: With dead ends: 291 [2019-02-18 09:36:34,506 INFO L226 Difference]: Without dead ends: 290 [2019-02-18 09:36:34,508 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 663 GetRequests, 378 SyntacticMatches, 90 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32265 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=14841, Invalid=23771, Unknown=0, NotChecked=0, Total=38612 [2019-02-18 09:36:34,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2019-02-18 09:36:34,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 289. [2019-02-18 09:36:34,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2019-02-18 09:36:34,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 289 transitions. [2019-02-18 09:36:34,513 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 289 transitions. Word has length 285 [2019-02-18 09:36:34,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:36:34,513 INFO L480 AbstractCegarLoop]: Abstraction has 289 states and 289 transitions. [2019-02-18 09:36:34,513 INFO L481 AbstractCegarLoop]: Interpolant automaton has 192 states. [2019-02-18 09:36:34,513 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 289 transitions. [2019-02-18 09:36:34,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2019-02-18 09:36:34,514 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:36:34,515 INFO L402 BasicCegarLoop]: trace histogram [96, 95, 95, 1, 1] [2019-02-18 09:36:34,515 INFO L423 AbstractCegarLoop]: === Iteration 96 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:36:34,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:36:34,515 INFO L82 PathProgramCache]: Analyzing trace with hash -1549756020, now seen corresponding path program 95 times [2019-02-18 09:36:34,515 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:36:34,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:36:34,516 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:36:34,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:36:34,516 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:36:34,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:36:38,661 INFO L134 CoverageAnalysis]: Checked inductivity of 13585 backedges. 0 proven. 13585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:36:38,661 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:36:38,662 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:36:38,662 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:36:38,662 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:36:38,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:36:38,662 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:36:38,671 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:36:38,671 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:36:39,251 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 96 check-sat command(s) [2019-02-18 09:36:39,251 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:36:39,261 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:36:39,264 INFO L478 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 6 treesize of output 5 [2019-02-18 09:36:39,264 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:36:39,273 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:36:39,273 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:36:44,549 INFO L134 CoverageAnalysis]: Checked inductivity of 13585 backedges. 0 proven. 13585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:36:44,550 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:36:48,754 INFO L134 CoverageAnalysis]: Checked inductivity of 13585 backedges. 0 proven. 13585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:36:48,774 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:36:48,774 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 196 [2019-02-18 09:36:48,774 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:36:48,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 194 states [2019-02-18 09:36:48,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2019-02-18 09:36:48,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14943, Invalid=24063, Unknown=0, NotChecked=0, Total=39006 [2019-02-18 09:36:48,778 INFO L87 Difference]: Start difference. First operand 289 states and 289 transitions. Second operand 194 states. [2019-02-18 09:36:49,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:36:49,642 INFO L93 Difference]: Finished difference Result 294 states and 294 transitions. [2019-02-18 09:36:49,643 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2019-02-18 09:36:49,643 INFO L78 Accepts]: Start accepts. Automaton has 194 states. Word has length 288 [2019-02-18 09:36:49,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:36:49,645 INFO L225 Difference]: With dead ends: 294 [2019-02-18 09:36:49,645 INFO L226 Difference]: Without dead ends: 293 [2019-02-18 09:36:49,646 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 670 GetRequests, 382 SyntacticMatches, 92 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32762 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=14943, Invalid=24063, Unknown=0, NotChecked=0, Total=39006 [2019-02-18 09:36:49,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2019-02-18 09:36:49,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 292. [2019-02-18 09:36:49,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2019-02-18 09:36:49,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 292 transitions. [2019-02-18 09:36:49,651 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 292 transitions. Word has length 288 [2019-02-18 09:36:49,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:36:49,651 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 292 transitions. [2019-02-18 09:36:49,652 INFO L481 AbstractCegarLoop]: Interpolant automaton has 194 states. [2019-02-18 09:36:49,652 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 292 transitions. [2019-02-18 09:36:49,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2019-02-18 09:36:49,653 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:36:49,653 INFO L402 BasicCegarLoop]: trace histogram [97, 96, 96, 1, 1] [2019-02-18 09:36:49,653 INFO L423 AbstractCegarLoop]: === Iteration 97 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:36:49,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:36:49,654 INFO L82 PathProgramCache]: Analyzing trace with hash 2116881696, now seen corresponding path program 96 times [2019-02-18 09:36:49,654 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:36:49,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:36:49,654 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:36:49,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:36:49,654 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:36:49,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:36:53,875 INFO L134 CoverageAnalysis]: Checked inductivity of 13872 backedges. 0 proven. 13872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:36:53,875 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:36:53,875 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:36:53,875 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:36:53,875 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:36:53,875 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:36:53,875 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:36:53,885 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:36:53,885 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:36:53,984 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:36:53,984 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:36:53,993 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:36:53,996 INFO L478 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 6 treesize of output 5 [2019-02-18 09:36:53,996 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:36:54,006 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:36:54,007 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:36:59,262 INFO L134 CoverageAnalysis]: Checked inductivity of 13872 backedges. 0 proven. 13872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:36:59,262 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:37:03,624 INFO L134 CoverageAnalysis]: Checked inductivity of 13872 backedges. 0 proven. 13872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:37:03,644 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:37:03,645 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 197 [2019-02-18 09:37:03,645 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:37:03,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 196 states [2019-02-18 09:37:03,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 196 interpolants. [2019-02-18 09:37:03,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15045, Invalid=24357, Unknown=0, NotChecked=0, Total=39402 [2019-02-18 09:37:03,648 INFO L87 Difference]: Start difference. First operand 292 states and 292 transitions. Second operand 196 states. [2019-02-18 09:37:04,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:37:04,319 INFO L93 Difference]: Finished difference Result 297 states and 297 transitions. [2019-02-18 09:37:04,319 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2019-02-18 09:37:04,319 INFO L78 Accepts]: Start accepts. Automaton has 196 states. Word has length 291 [2019-02-18 09:37:04,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:37:04,321 INFO L225 Difference]: With dead ends: 297 [2019-02-18 09:37:04,321 INFO L226 Difference]: Without dead ends: 296 [2019-02-18 09:37:04,323 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 677 GetRequests, 386 SyntacticMatches, 94 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33259 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=15045, Invalid=24357, Unknown=0, NotChecked=0, Total=39402 [2019-02-18 09:37:04,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2019-02-18 09:37:04,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 295. [2019-02-18 09:37:04,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 295 states. [2019-02-18 09:37:04,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 295 transitions. [2019-02-18 09:37:04,327 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 295 transitions. Word has length 291 [2019-02-18 09:37:04,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:37:04,328 INFO L480 AbstractCegarLoop]: Abstraction has 295 states and 295 transitions. [2019-02-18 09:37:04,328 INFO L481 AbstractCegarLoop]: Interpolant automaton has 196 states. [2019-02-18 09:37:04,328 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 295 transitions. [2019-02-18 09:37:04,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2019-02-18 09:37:04,329 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:37:04,329 INFO L402 BasicCegarLoop]: trace histogram [98, 97, 97, 1, 1] [2019-02-18 09:37:04,329 INFO L423 AbstractCegarLoop]: === Iteration 98 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:37:04,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:37:04,329 INFO L82 PathProgramCache]: Analyzing trace with hash 1017839884, now seen corresponding path program 97 times [2019-02-18 09:37:04,329 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:37:04,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:37:04,330 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:37:04,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:37:04,330 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:37:04,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:37:08,821 INFO L134 CoverageAnalysis]: Checked inductivity of 14162 backedges. 0 proven. 14162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:37:08,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:37:08,821 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:37:08,821 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:37:08,822 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:37:08,822 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:37:08,822 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:37:08,829 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:37:08,829 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:37:08,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:37:08,918 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:37:08,920 INFO L478 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 6 treesize of output 5 [2019-02-18 09:37:08,921 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:37:08,930 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:37:08,931 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:37:14,419 INFO L134 CoverageAnalysis]: Checked inductivity of 14162 backedges. 0 proven. 14162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:37:14,419 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:37:19,057 INFO L134 CoverageAnalysis]: Checked inductivity of 14162 backedges. 0 proven. 14162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:37:19,076 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:37:19,076 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98, 98] total 198 [2019-02-18 09:37:19,076 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:37:19,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 198 states [2019-02-18 09:37:19,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 198 interpolants. [2019-02-18 09:37:19,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15147, Invalid=24653, Unknown=0, NotChecked=0, Total=39800 [2019-02-18 09:37:19,079 INFO L87 Difference]: Start difference. First operand 295 states and 295 transitions. Second operand 198 states. [2019-02-18 09:37:19,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:37:19,959 INFO L93 Difference]: Finished difference Result 300 states and 300 transitions. [2019-02-18 09:37:19,959 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2019-02-18 09:37:19,959 INFO L78 Accepts]: Start accepts. Automaton has 198 states. Word has length 294 [2019-02-18 09:37:19,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:37:19,961 INFO L225 Difference]: With dead ends: 300 [2019-02-18 09:37:19,961 INFO L226 Difference]: Without dead ends: 299 [2019-02-18 09:37:19,963 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 390 SyntacticMatches, 96 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33756 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=15147, Invalid=24653, Unknown=0, NotChecked=0, Total=39800 [2019-02-18 09:37:19,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2019-02-18 09:37:19,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 298. [2019-02-18 09:37:19,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2019-02-18 09:37:19,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 298 transitions. [2019-02-18 09:37:19,968 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 298 transitions. Word has length 294 [2019-02-18 09:37:19,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:37:19,969 INFO L480 AbstractCegarLoop]: Abstraction has 298 states and 298 transitions. [2019-02-18 09:37:19,969 INFO L481 AbstractCegarLoop]: Interpolant automaton has 198 states. [2019-02-18 09:37:19,969 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 298 transitions. [2019-02-18 09:37:19,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2019-02-18 09:37:19,970 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:37:19,970 INFO L402 BasicCegarLoop]: trace histogram [99, 98, 98, 1, 1] [2019-02-18 09:37:19,970 INFO L423 AbstractCegarLoop]: === Iteration 99 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:37:19,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:37:19,970 INFO L82 PathProgramCache]: Analyzing trace with hash -1084000, now seen corresponding path program 98 times [2019-02-18 09:37:19,970 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:37:19,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:37:19,971 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:37:19,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:37:19,971 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:37:20,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:37:24,503 INFO L134 CoverageAnalysis]: Checked inductivity of 14455 backedges. 0 proven. 14455 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:37:24,503 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:37:24,503 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:37:24,503 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:37:24,504 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:37:24,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:37:24,504 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:37:24,513 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-18 09:37:24,513 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-18 09:37:25,132 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 99 check-sat command(s) [2019-02-18 09:37:25,132 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:37:25,141 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:37:25,149 INFO L478 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 6 treesize of output 5 [2019-02-18 09:37:25,149 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:37:25,221 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:37:25,222 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:37:30,849 INFO L134 CoverageAnalysis]: Checked inductivity of 14455 backedges. 0 proven. 14455 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:37:30,849 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:37:35,167 INFO L134 CoverageAnalysis]: Checked inductivity of 14455 backedges. 0 proven. 14455 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:37:35,186 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:37:35,186 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 199 [2019-02-18 09:37:35,186 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:37:35,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 200 states [2019-02-18 09:37:35,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 200 interpolants. [2019-02-18 09:37:35,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15249, Invalid=24951, Unknown=0, NotChecked=0, Total=40200 [2019-02-18 09:37:35,189 INFO L87 Difference]: Start difference. First operand 298 states and 298 transitions. Second operand 200 states. [2019-02-18 09:37:36,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:37:36,150 INFO L93 Difference]: Finished difference Result 303 states and 303 transitions. [2019-02-18 09:37:36,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2019-02-18 09:37:36,151 INFO L78 Accepts]: Start accepts. Automaton has 200 states. Word has length 297 [2019-02-18 09:37:36,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:37:36,152 INFO L225 Difference]: With dead ends: 303 [2019-02-18 09:37:36,152 INFO L226 Difference]: Without dead ends: 302 [2019-02-18 09:37:36,153 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 691 GetRequests, 394 SyntacticMatches, 98 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34253 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=15249, Invalid=24951, Unknown=0, NotChecked=0, Total=40200 [2019-02-18 09:37:36,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2019-02-18 09:37:36,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 301. [2019-02-18 09:37:36,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 301 states. [2019-02-18 09:37:36,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 301 transitions. [2019-02-18 09:37:36,160 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 301 transitions. Word has length 297 [2019-02-18 09:37:36,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:37:36,160 INFO L480 AbstractCegarLoop]: Abstraction has 301 states and 301 transitions. [2019-02-18 09:37:36,160 INFO L481 AbstractCegarLoop]: Interpolant automaton has 200 states. [2019-02-18 09:37:36,160 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 301 transitions. [2019-02-18 09:37:36,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2019-02-18 09:37:36,162 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:37:36,162 INFO L402 BasicCegarLoop]: trace histogram [100, 99, 99, 1, 1] [2019-02-18 09:37:36,162 INFO L423 AbstractCegarLoop]: === Iteration 100 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:37:36,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:37:36,163 INFO L82 PathProgramCache]: Analyzing trace with hash 2066335884, now seen corresponding path program 99 times [2019-02-18 09:37:36,163 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:37:36,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:37:36,163 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:37:36,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:37:36,164 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:37:36,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:37:40,930 INFO L134 CoverageAnalysis]: Checked inductivity of 14751 backedges. 0 proven. 14751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:37:40,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:37:40,930 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:37:40,930 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:37:40,930 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:37:40,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:37:40,931 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:37:40,938 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-18 09:37:40,938 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-18 09:37:41,063 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-18 09:37:41,063 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-18 09:37:41,076 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:37:41,091 INFO L478 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 6 treesize of output 5 [2019-02-18 09:37:41,092 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-02-18 09:37:41,138 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-02-18 09:37:41,139 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-02-18 09:37:46,803 INFO L134 CoverageAnalysis]: Checked inductivity of 14751 backedges. 0 proven. 14751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:37:46,803 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:37:51,217 INFO L134 CoverageAnalysis]: Checked inductivity of 14751 backedges. 0 proven. 14751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:37:51,235 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-18 09:37:51,236 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100, 100] total 200 [2019-02-18 09:37:51,236 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-18 09:37:51,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 202 states [2019-02-18 09:37:51,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 202 interpolants. [2019-02-18 09:37:51,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15351, Invalid=25251, Unknown=0, NotChecked=0, Total=40602 [2019-02-18 09:37:51,239 INFO L87 Difference]: Start difference. First operand 301 states and 301 transitions. Second operand 202 states. [2019-02-18 09:37:51,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:37:51,998 INFO L93 Difference]: Finished difference Result 306 states and 306 transitions. [2019-02-18 09:37:51,999 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2019-02-18 09:37:51,999 INFO L78 Accepts]: Start accepts. Automaton has 202 states. Word has length 300 [2019-02-18 09:37:51,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:37:52,000 INFO L225 Difference]: With dead ends: 306 [2019-02-18 09:37:52,000 INFO L226 Difference]: Without dead ends: 305 [2019-02-18 09:37:52,001 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 399 SyntacticMatches, 99 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34551 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=15351, Invalid=25251, Unknown=0, NotChecked=0, Total=40602 [2019-02-18 09:37:52,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2019-02-18 09:37:52,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 304. [2019-02-18 09:37:52,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2019-02-18 09:37:52,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 304 transitions. [2019-02-18 09:37:52,006 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 304 transitions. Word has length 300 [2019-02-18 09:37:52,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:37:52,006 INFO L480 AbstractCegarLoop]: Abstraction has 304 states and 304 transitions. [2019-02-18 09:37:52,006 INFO L481 AbstractCegarLoop]: Interpolant automaton has 202 states. [2019-02-18 09:37:52,006 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 304 transitions. [2019-02-18 09:37:52,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 304 [2019-02-18 09:37:52,008 INFO L394 BasicCegarLoop]: Found error trace [2019-02-18 09:37:52,008 INFO L402 BasicCegarLoop]: trace histogram [101, 100, 100, 1, 1] [2019-02-18 09:37:52,008 INFO L423 AbstractCegarLoop]: === Iteration 101 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-02-18 09:37:52,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-18 09:37:52,008 INFO L82 PathProgramCache]: Analyzing trace with hash -1553891808, now seen corresponding path program 100 times [2019-02-18 09:37:52,009 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-18 09:37:52,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:37:52,009 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-18 09:37:52,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-18 09:37:52,009 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-18 09:37:52,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:37:56,579 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 14752 proven. 298 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:37:56,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:37:56,580 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-18 09:37:56,580 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-18 09:37:56,580 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-18 09:37:56,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-18 09:37:56,580 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-02-18 09:37:56,588 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-18 09:37:56,588 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-18 09:37:56,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-18 09:37:56,674 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-18 09:37:56,872 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 15050 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:37:56,872 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-18 09:38:01,024 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 15050 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-18 09:38:01,043 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-02-18 09:38:01,043 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [102, 102] imperfect sequences [102] total 103 [2019-02-18 09:38:01,043 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-02-18 09:38:01,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 103 states [2019-02-18 09:38:01,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2019-02-18 09:38:01,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5256, Invalid=5456, Unknown=0, NotChecked=0, Total=10712 [2019-02-18 09:38:01,045 INFO L87 Difference]: Start difference. First operand 304 states and 304 transitions. Second operand 103 states. [2019-02-18 09:38:01,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-18 09:38:01,803 INFO L93 Difference]: Finished difference Result 306 states and 306 transitions. [2019-02-18 09:38:01,803 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2019-02-18 09:38:01,803 INFO L78 Accepts]: Start accepts. Automaton has 103 states. Word has length 303 [2019-02-18 09:38:01,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-18 09:38:01,804 INFO L225 Difference]: With dead ends: 306 [2019-02-18 09:38:01,804 INFO L226 Difference]: Without dead ends: 0 [2019-02-18 09:38:01,806 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 706 GetRequests, 504 SyntacticMatches, 100 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5544 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=5256, Invalid=5456, Unknown=0, NotChecked=0, Total=10712 [2019-02-18 09:38:01,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-02-18 09:38:01,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-02-18 09:38:01,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-02-18 09:38:01,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-02-18 09:38:01,808 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 303 [2019-02-18 09:38:01,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-18 09:38:01,808 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-02-18 09:38:01,808 INFO L481 AbstractCegarLoop]: Interpolant automaton has 103 states. [2019-02-18 09:38:01,808 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-02-18 09:38:01,809 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-02-18 09:38:01,813 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2019-02-18 09:38:01,934 WARN L181 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 511 [2019-02-18 09:38:04,995 WARN L181 SmtUtils]: Spent 3.06 s on a formula simplification. DAG size of input: 511 DAG size of output: 509 [2019-02-18 09:38:05,002 INFO L448 ceAbstractionStarter]: For program point mainENTRY(lines 2 23) no Hoare annotation was computed. [2019-02-18 09:38:05,002 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 2 23) no Hoare annotation was computed. [2019-02-18 09:38:05,002 INFO L448 ceAbstractionStarter]: For program point L15(line 15) no Hoare annotation was computed. [2019-02-18 09:38:05,002 INFO L448 ceAbstractionStarter]: For program point L14(lines 14 19) no Hoare annotation was computed. [2019-02-18 09:38:05,005 INFO L444 ceAbstractionStarter]: At program point L12-1(lines 12 21) the Hoare annotation is: (let ((.cse0 (<= 400 (select |#length| main_q.base)))) (or (and (<= main_q.offset 112) (<= (+ main_p.offset 112) main_q.offset) .cse0) (and (<= main_q.offset 260) (<= (+ main_p.offset 260) main_q.offset) .cse0) (and (<= (+ main_p.offset 128) main_q.offset) (<= main_q.offset 128) .cse0) (and (<= (+ main_p.offset 196) main_q.offset) (<= main_q.offset 196) .cse0) (and (<= main_q.offset 124) (<= (+ main_p.offset 124) main_q.offset) .cse0) (and (<= (+ main_p.offset 308) main_q.offset) (<= main_q.offset 308) .cse0) (and (<= main_q.offset 240) (<= (+ main_p.offset 240) main_q.offset) .cse0) (and (<= main_q.offset 332) (<= (+ main_p.offset 332) main_q.offset) .cse0) (and (<= (+ main_p.offset 296) main_q.offset) (<= main_q.offset 296) .cse0) (and (<= (+ main_p.offset 268) main_q.offset) (<= main_q.offset 268) .cse0) (and (<= main_q.offset 160) (<= (+ main_p.offset 160) main_q.offset) .cse0) (and (<= main_q.offset 180) (<= (+ main_p.offset 180) main_q.offset) .cse0) (and (<= (+ main_p.offset 368) main_q.offset) (<= main_q.offset 368) .cse0) (and (<= main_q.offset 384) (<= (+ main_p.offset 384) main_q.offset) .cse0) (and (<= main_q.offset 392) (<= (+ main_p.offset 392) main_q.offset) .cse0) (and (<= main_q.offset 144) .cse0 (<= (+ main_p.offset 144) main_q.offset)) (and (<= main_q.offset 200) (<= (+ main_p.offset 200) main_q.offset) .cse0) (and (<= (+ main_p.offset 288) main_q.offset) (<= main_q.offset 288) .cse0) (and (<= main_q.offset 340) (<= (+ main_p.offset 340) main_q.offset) .cse0) (and (<= main_q.offset 356) (<= (+ main_p.offset 356) main_q.offset) .cse0) (and (<= (+ main_p.offset 276) main_q.offset) (<= main_q.offset 276) .cse0) (and (<= main_q.offset 336) (<= (+ main_p.offset 336) main_q.offset) .cse0) (and (<= (+ main_p.offset 140) main_q.offset) (<= main_q.offset 140) .cse0) (and (<= main_q.offset 244) (<= (+ main_p.offset 244) main_q.offset) .cse0) (and (<= (+ main_p.offset 396) main_q.offset) (<= main_q.offset 396) .cse0) (and (<= (+ main_p.offset 312) main_q.offset) (<= main_q.offset 312) .cse0) (and (<= main_q.offset 148) (<= (+ main_p.offset 148) main_q.offset) .cse0) (and (<= (+ main_p.offset 352) main_q.offset) (<= main_q.offset 352) .cse0) (and (<= main_q.offset 344) (<= (+ main_p.offset 344) main_q.offset) .cse0) (and (<= main_q.offset 164) (<= (+ main_p.offset 164) main_q.offset) .cse0) (and (<= (+ main_p.offset 304) main_q.offset) (<= main_q.offset 304) .cse0) (and (<= main_q.offset 320) (<= (+ main_p.offset 320) main_q.offset) .cse0) (and (<= (+ main_p.offset 36) main_q.offset) (<= main_q.offset 36) .cse0) (and (<= (+ main_p.offset 44) main_q.offset) (<= main_q.offset 44) .cse0) (and (<= (+ main_p.offset 228) main_q.offset) (<= main_q.offset 228) .cse0) (and (<= main_p.offset main_q.offset) (<= main_q.offset 0) .cse0) (and (<= (+ main_p.offset 284) main_q.offset) (<= main_q.offset 284) .cse0) (and (<= (+ main_p.offset 188) main_q.offset) (<= main_q.offset 188) .cse0) (and (<= (+ main_p.offset 8) main_q.offset) (<= main_q.offset 8) .cse0) (and (<= main_q.offset 348) .cse0 (<= (+ main_p.offset 348) main_q.offset)) (<= (+ main_p.offset 400) main_q.offset) (and (<= (+ main_p.offset 224) main_q.offset) (<= main_q.offset 224) .cse0) (and (<= (+ main_p.offset 120) main_q.offset) (<= main_q.offset 120) .cse0) (and (<= main_q.offset 232) (<= (+ main_p.offset 232) main_q.offset) .cse0) (and (<= main_q.offset 92) (<= (+ main_p.offset 92) main_q.offset) .cse0) (and (<= main_q.offset 236) (<= (+ main_p.offset 236) main_q.offset) .cse0) (and (<= (+ main_p.offset 328) main_q.offset) (<= main_q.offset 328) .cse0) (and (<= main_q.offset 12) (<= (+ main_p.offset 12) main_q.offset) .cse0) (and (<= (+ main_p.offset 64) main_q.offset) (<= main_q.offset 64) .cse0) (and (<= (+ main_p.offset 192) main_q.offset) (<= main_q.offset 192) .cse0) (and (<= (+ main_p.offset 104) main_q.offset) (<= main_q.offset 104) .cse0) (and (<= main_q.offset 280) (<= (+ main_p.offset 280) main_q.offset) .cse0) (and (<= (+ main_p.offset 316) main_q.offset) (<= main_q.offset 316) .cse0) (and (<= main_q.offset 152) (<= (+ main_p.offset 152) main_q.offset) .cse0) (and (<= (+ main_p.offset 248) main_q.offset) (<= main_q.offset 248) .cse0) (and (<= main_q.offset 28) (<= (+ main_p.offset 28) main_q.offset) .cse0) (and (<= (+ main_p.offset 68) main_q.offset) (<= main_q.offset 68) .cse0) (and (<= main_q.offset 4) .cse0 (<= (+ main_p.offset 4) main_q.offset)) (and (<= (+ main_p.offset 204) main_q.offset) (<= main_q.offset 204) .cse0) (and (<= main_q.offset 380) (<= (+ main_p.offset 380) main_q.offset) .cse0) (and (<= main_q.offset 52) (<= (+ main_p.offset 52) main_q.offset) .cse0) (and (<= (+ main_p.offset 172) main_q.offset) (<= main_q.offset 172) .cse0) (and (<= main_q.offset 56) (<= (+ main_p.offset 56) main_q.offset) .cse0) (and (<= main_q.offset 60) (<= (+ main_p.offset 60) main_q.offset) .cse0) (and (<= main_q.offset 100) (<= (+ main_p.offset 100) main_q.offset) .cse0) (and (<= main_q.offset 208) (<= (+ main_p.offset 208) main_q.offset) .cse0) (and (<= (+ main_p.offset 220) main_q.offset) (<= main_q.offset 220) .cse0) (and (<= (+ main_p.offset 132) main_q.offset) (<= main_q.offset 132) .cse0) (and (<= main_q.offset 176) (<= (+ main_p.offset 176) main_q.offset) .cse0) (and (<= main_q.offset 116) (<= (+ main_p.offset 116) main_q.offset) .cse0) (and (<= (+ main_p.offset 136) main_q.offset) (<= main_q.offset 136) .cse0) (and (<= main_q.offset 184) (<= (+ main_p.offset 184) main_q.offset) .cse0) (and (<= main_q.offset 20) (<= (+ main_p.offset 20) main_q.offset) .cse0) (and (<= (+ main_p.offset 216) main_q.offset) (<= main_q.offset 216) .cse0) (and (<= (+ main_p.offset 376) main_q.offset) (<= main_q.offset 376) .cse0) (and (<= (+ main_p.offset 324) main_q.offset) (<= main_q.offset 324) .cse0) (and (<= (+ main_p.offset 72) main_q.offset) (<= main_q.offset 72) .cse0) (and (<= main_q.offset 76) (<= (+ main_p.offset 76) main_q.offset) .cse0) (and (<= main_q.offset 16) (<= (+ main_p.offset 16) main_q.offset) .cse0) (and (<= main_q.offset 84) (<= (+ main_p.offset 84) main_q.offset) .cse0) (and (<= (+ main_p.offset 364) main_q.offset) (<= main_q.offset 364) .cse0) (and (<= (+ main_p.offset 156) main_q.offset) (<= main_q.offset 156) .cse0) (and (<= (+ main_p.offset 88) main_q.offset) .cse0 (<= main_q.offset 88)) (and (<= main_q.offset 168) (<= (+ main_p.offset 168) main_q.offset) .cse0) (and (<= (+ main_p.offset 48) main_q.offset) (<= main_q.offset 48) .cse0) (and (<= main_q.offset 252) (<= (+ main_p.offset 252) main_q.offset) .cse0) (and (<= (+ main_p.offset 264) main_q.offset) (<= main_q.offset 264) .cse0) (and (<= (+ main_p.offset 388) main_q.offset) (<= main_q.offset 388) .cse0) (and (<= main_q.offset 256) (<= (+ main_p.offset 256) main_q.offset) .cse0) (and (<= (+ main_p.offset 40) main_q.offset) (<= main_q.offset 40) .cse0) (and (<= main_q.offset 300) .cse0 (<= (+ main_p.offset 300) main_q.offset)) (and (<= (+ main_p.offset 80) main_q.offset) (<= main_q.offset 80) .cse0) (and (<= main_q.offset 108) .cse0 (<= (+ main_p.offset 108) main_q.offset)) (and (<= main_q.offset 212) (<= (+ main_p.offset 212) main_q.offset) .cse0) (and (<= main_q.offset 372) (<= (+ main_p.offset 372) main_q.offset) .cse0) (and (<= (+ main_p.offset 96) main_q.offset) .cse0 (<= main_q.offset 96)) (and (<= (+ main_p.offset 272) main_q.offset) (<= main_q.offset 272) .cse0) (and (<= main_q.offset 292) (<= (+ main_p.offset 292) main_q.offset) .cse0) (and (<= (+ main_p.offset 360) main_q.offset) (<= main_q.offset 360) .cse0) (and (<= main_q.offset 32) (<= (+ main_p.offset 32) main_q.offset) .cse0) (and (<= (+ main_p.offset 24) main_q.offset) (<= main_q.offset 24) .cse0))) [2019-02-18 09:38:05,005 INFO L448 ceAbstractionStarter]: For program point L12-2(lines 2 23) no Hoare annotation was computed. [2019-02-18 09:38:05,005 INFO L448 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONASSERT(line 15) no Hoare annotation was computed. [2019-02-18 09:38:05,072 INFO L202 PluginConnector]: Adding new model PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.02 09:38:05 BoogieIcfgContainer [2019-02-18 09:38:05,072 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-02-18 09:38:05,073 INFO L168 Benchmark]: Toolchain (without parser) took 721133.72 ms. Allocated memory was 134.7 MB in the beginning and 2.4 GB in the end (delta: 2.3 GB). Free memory was 109.6 MB in the beginning and 1.2 GB in the end (delta: -1.1 GB). Peak memory consumption was 1.2 GB. Max. memory is 7.1 GB. [2019-02-18 09:38:05,073 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.19 ms. Allocated memory is still 134.7 MB. Free memory is still 110.9 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-02-18 09:38:05,074 INFO L168 Benchmark]: Boogie Procedure Inliner took 55.43 ms. Allocated memory is still 134.7 MB. Free memory was 109.6 MB in the beginning and 107.5 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB. [2019-02-18 09:38:05,074 INFO L168 Benchmark]: Boogie Preprocessor took 24.70 ms. Allocated memory is still 134.7 MB. Free memory was 107.5 MB in the beginning and 106.2 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2019-02-18 09:38:05,075 INFO L168 Benchmark]: RCFGBuilder took 304.22 ms. Allocated memory is still 134.7 MB. Free memory was 106.2 MB in the beginning and 96.5 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2019-02-18 09:38:05,075 INFO L168 Benchmark]: TraceAbstraction took 720744.97 ms. Allocated memory was 134.7 MB in the beginning and 2.4 GB in the end (delta: 2.3 GB). Free memory was 96.5 MB in the beginning and 1.2 GB in the end (delta: -1.1 GB). Peak memory consumption was 1.2 GB. Max. memory is 7.1 GB. [2019-02-18 09:38:05,077 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.19 ms. Allocated memory is still 134.7 MB. Free memory is still 110.9 MB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 55.43 ms. Allocated memory is still 134.7 MB. Free memory was 109.6 MB in the beginning and 107.5 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 24.70 ms. Allocated memory is still 134.7 MB. Free memory was 107.5 MB in the beginning and 106.2 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 304.22 ms. Allocated memory is still 134.7 MB. Free memory was 106.2 MB in the beginning and 96.5 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 720744.97 ms. Allocated memory was 134.7 MB in the beginning and 2.4 GB in the end (delta: 2.3 GB). Free memory was 96.5 MB in the beginning and 1.2 GB in the end (delta: -1.1 GB). Peak memory consumption was 1.2 GB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 15]: assertion always holds For all program executions holds that assertion always holds at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 12]: Loop Invariant Derived loop invariant: (((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((q!offset <= 112 && p!offset + 112 <= q!offset) && 400 <= #length[q!base]) || ((q!offset <= 260 && p!offset + 260 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 128 <= q!offset && q!offset <= 128) && 400 <= #length[q!base])) || ((p!offset + 196 <= q!offset && q!offset <= 196) && 400 <= #length[q!base])) || ((q!offset <= 124 && p!offset + 124 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 308 <= q!offset && q!offset <= 308) && 400 <= #length[q!base])) || ((q!offset <= 240 && p!offset + 240 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 332 && p!offset + 332 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 296 <= q!offset && q!offset <= 296) && 400 <= #length[q!base])) || ((p!offset + 268 <= q!offset && q!offset <= 268) && 400 <= #length[q!base])) || ((q!offset <= 160 && p!offset + 160 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 180 && p!offset + 180 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 368 <= q!offset && q!offset <= 368) && 400 <= #length[q!base])) || ((q!offset <= 384 && p!offset + 384 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 392 && p!offset + 392 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 144 && 400 <= #length[q!base]) && p!offset + 144 <= q!offset)) || ((q!offset <= 200 && p!offset + 200 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 288 <= q!offset && q!offset <= 288) && 400 <= #length[q!base])) || ((q!offset <= 340 && p!offset + 340 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 356 && p!offset + 356 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 276 <= q!offset && q!offset <= 276) && 400 <= #length[q!base])) || ((q!offset <= 336 && p!offset + 336 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 140 <= q!offset && q!offset <= 140) && 400 <= #length[q!base])) || ((q!offset <= 244 && p!offset + 244 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 396 <= q!offset && q!offset <= 396) && 400 <= #length[q!base])) || ((p!offset + 312 <= q!offset && q!offset <= 312) && 400 <= #length[q!base])) || ((q!offset <= 148 && p!offset + 148 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 352 <= q!offset && q!offset <= 352) && 400 <= #length[q!base])) || ((q!offset <= 344 && p!offset + 344 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 164 && p!offset + 164 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 304 <= q!offset && q!offset <= 304) && 400 <= #length[q!base])) || ((q!offset <= 320 && p!offset + 320 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 36 <= q!offset && q!offset <= 36) && 400 <= #length[q!base])) || ((p!offset + 44 <= q!offset && q!offset <= 44) && 400 <= #length[q!base])) || ((p!offset + 228 <= q!offset && q!offset <= 228) && 400 <= #length[q!base])) || ((p!offset <= q!offset && q!offset <= 0) && 400 <= #length[q!base])) || ((p!offset + 284 <= q!offset && q!offset <= 284) && 400 <= #length[q!base])) || ((p!offset + 188 <= q!offset && q!offset <= 188) && 400 <= #length[q!base])) || ((p!offset + 8 <= q!offset && q!offset <= 8) && 400 <= #length[q!base])) || ((q!offset <= 348 && 400 <= #length[q!base]) && p!offset + 348 <= q!offset)) || p!offset + 400 <= q!offset) || ((p!offset + 224 <= q!offset && q!offset <= 224) && 400 <= #length[q!base])) || ((p!offset + 120 <= q!offset && q!offset <= 120) && 400 <= #length[q!base])) || ((q!offset <= 232 && p!offset + 232 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 92 && p!offset + 92 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 236 && p!offset + 236 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 328 <= q!offset && q!offset <= 328) && 400 <= #length[q!base])) || ((q!offset <= 12 && p!offset + 12 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 64 <= q!offset && q!offset <= 64) && 400 <= #length[q!base])) || ((p!offset + 192 <= q!offset && q!offset <= 192) && 400 <= #length[q!base])) || ((p!offset + 104 <= q!offset && q!offset <= 104) && 400 <= #length[q!base])) || ((q!offset <= 280 && p!offset + 280 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 316 <= q!offset && q!offset <= 316) && 400 <= #length[q!base])) || ((q!offset <= 152 && p!offset + 152 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 248 <= q!offset && q!offset <= 248) && 400 <= #length[q!base])) || ((q!offset <= 28 && p!offset + 28 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 68 <= q!offset && q!offset <= 68) && 400 <= #length[q!base])) || ((q!offset <= 4 && 400 <= #length[q!base]) && p!offset + 4 <= q!offset)) || ((p!offset + 204 <= q!offset && q!offset <= 204) && 400 <= #length[q!base])) || ((q!offset <= 380 && p!offset + 380 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 52 && p!offset + 52 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 172 <= q!offset && q!offset <= 172) && 400 <= #length[q!base])) || ((q!offset <= 56 && p!offset + 56 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 60 && p!offset + 60 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 100 && p!offset + 100 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 208 && p!offset + 208 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 220 <= q!offset && q!offset <= 220) && 400 <= #length[q!base])) || ((p!offset + 132 <= q!offset && q!offset <= 132) && 400 <= #length[q!base])) || ((q!offset <= 176 && p!offset + 176 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 116 && p!offset + 116 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 136 <= q!offset && q!offset <= 136) && 400 <= #length[q!base])) || ((q!offset <= 184 && p!offset + 184 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 20 && p!offset + 20 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 216 <= q!offset && q!offset <= 216) && 400 <= #length[q!base])) || ((p!offset + 376 <= q!offset && q!offset <= 376) && 400 <= #length[q!base])) || ((p!offset + 324 <= q!offset && q!offset <= 324) && 400 <= #length[q!base])) || ((p!offset + 72 <= q!offset && q!offset <= 72) && 400 <= #length[q!base])) || ((q!offset <= 76 && p!offset + 76 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 16 && p!offset + 16 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 84 && p!offset + 84 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 364 <= q!offset && q!offset <= 364) && 400 <= #length[q!base])) || ((p!offset + 156 <= q!offset && q!offset <= 156) && 400 <= #length[q!base])) || ((p!offset + 88 <= q!offset && 400 <= #length[q!base]) && q!offset <= 88)) || ((q!offset <= 168 && p!offset + 168 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 48 <= q!offset && q!offset <= 48) && 400 <= #length[q!base])) || ((q!offset <= 252 && p!offset + 252 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 264 <= q!offset && q!offset <= 264) && 400 <= #length[q!base])) || ((p!offset + 388 <= q!offset && q!offset <= 388) && 400 <= #length[q!base])) || ((q!offset <= 256 && p!offset + 256 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 40 <= q!offset && q!offset <= 40) && 400 <= #length[q!base])) || ((q!offset <= 300 && 400 <= #length[q!base]) && p!offset + 300 <= q!offset)) || ((p!offset + 80 <= q!offset && q!offset <= 80) && 400 <= #length[q!base])) || ((q!offset <= 108 && 400 <= #length[q!base]) && p!offset + 108 <= q!offset)) || ((q!offset <= 212 && p!offset + 212 <= q!offset) && 400 <= #length[q!base])) || ((q!offset <= 372 && p!offset + 372 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 96 <= q!offset && 400 <= #length[q!base]) && q!offset <= 96)) || ((p!offset + 272 <= q!offset && q!offset <= 272) && 400 <= #length[q!base])) || ((q!offset <= 292 && p!offset + 292 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 360 <= q!offset && q!offset <= 360) && 400 <= #length[q!base])) || ((q!offset <= 32 && p!offset + 32 <= q!offset) && 400 <= #length[q!base])) || ((p!offset + 24 <= q!offset && q!offset <= 24) && 400 <= #length[q!base]) - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 7 locations, 1 error locations. SAFE Result, 720.6s OverallTime, 101 OverallIterations, 101 TraceHistogramMax, 42.0s AutomataDifference, 0.0s DeadEndRemovalTime, 3.1s HoareAnnotationTime, HoareTripleCheckerStatistics: 202 SDtfs, 7321 SDslu, 1 SDs, 0 SdLazy, 27597 SolverSat, 353 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 26.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 35852 GetRequests, 20503 SyntacticMatches, 2649 SemanticMatches, 12700 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1303168 ImplicationChecksByTransitivity, 629.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=304occurred in iteration=100, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.4s AutomataMinimizationTime, 101 MinimizatonAttempts, 100 StatesRemovedByMinimization, 100 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 1 LocationsWithAnnotation, 1 PreInvPairs, 102 NumberOfFragments, 1404 HoareAnnotationTreeSize, 1 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 1 FomulaSimplificationsInter, 7 FormulaSimplificationTreeSizeReductionInter, 3.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.7s SsaConstructionTime, 12.6s SatisfiabilityAnalysisTime, 653.3s InterpolantComputationTime, 30903 NumberOfCodeBlocks, 30903 NumberOfCodeBlocksAsserted, 1884 NumberOfCheckSat, 46052 ConstructedInterpolants, 0 QuantifiedInterpolants, 70702786 SizeOfPredicates, 596 NumberOfNonLiveVariables, 32500 ConjunctsInSsa, 15942 ConjunctsInUnsatCore, 301 InterpolantComputations, 3 PerfectInterpolantSequences, 44852/1530150 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...