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-fa1c628-m [2019-01-31 16:54:28,629 INFO L170 SettingsManager]: Resetting all preferences to default values... [2019-01-31 16:54:28,631 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2019-01-31 16:54:28,648 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-01-31 16:54:28,648 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-01-31 16:54:28,653 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-01-31 16:54:28,656 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-01-31 16:54:28,659 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2019-01-31 16:54:28,661 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-01-31 16:54:28,663 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-01-31 16:54:28,665 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-01-31 16:54:28,666 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-01-31 16:54:28,667 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-01-31 16:54:28,668 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-01-31 16:54:28,672 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-01-31 16:54:28,673 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-01-31 16:54:28,673 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-01-31 16:54:28,677 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-01-31 16:54:28,691 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2019-01-31 16:54:28,693 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-01-31 16:54:28,694 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-01-31 16:54:28,695 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-01-31 16:54:28,698 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-01-31 16:54:28,713 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 [2019-01-31 16:54:28,738 INFO L110 SettingsManager]: Loading preferences was successful [2019-01-31 16:54:28,739 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2019-01-31 16:54:28,739 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2019-01-31 16:54:28,742 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2019-01-31 16:54:28,742 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-01-31 16:54:28,742 INFO L133 SettingsManager]: * User list type=DISABLED [2019-01-31 16:54:28,743 INFO L133 SettingsManager]: * Inline calls to unimplemented procedures=true [2019-01-31 16:54:28,743 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-01-31 16:54:28,743 INFO L133 SettingsManager]: * Explicit value domain=true [2019-01-31 16:54:28,743 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-01-31 16:54:28,744 INFO L133 SettingsManager]: * Octagon Domain=false [2019-01-31 16:54:28,744 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2019-01-31 16:54:28,744 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-01-31 16:54:28,744 INFO L133 SettingsManager]: * Interval Domain=false [2019-01-31 16:54:28,746 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-01-31 16:54:28,746 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2019-01-31 16:54:28,746 INFO L133 SettingsManager]: * Use SBE=true [2019-01-31 16:54:28,747 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-01-31 16:54:28,748 INFO L133 SettingsManager]: * sizeof long=4 [2019-01-31 16:54:28,749 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2019-01-31 16:54:28,749 INFO L133 SettingsManager]: * sizeof POINTER=4 [2019-01-31 16:54:28,749 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2019-01-31 16:54:28,749 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-01-31 16:54:28,749 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-01-31 16:54:28,750 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-01-31 16:54:28,750 INFO L133 SettingsManager]: * sizeof long double=12 [2019-01-31 16:54:28,750 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2019-01-31 16:54:28,750 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-01-31 16:54:28,751 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-01-31 16:54:28,751 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-01-31 16:54:28,751 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2019-01-31 16:54:28,751 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:8092 -smt2 -in -t:10000 [2019-01-31 16:54:28,751 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-01-31 16:54:28,752 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-01-31 16:54:28,752 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-01-31 16:54:28,752 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-01-31 16:54:28,752 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-01-31 16:54:28,753 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:8092 -smt2 -in [2019-01-31 16:54:28,753 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-01-31 16:54:28,754 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-01-31 16:54:28,798 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-01-31 16:54:28,810 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-01-31 16:54:28,814 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-01-31 16:54:28,816 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2019-01-31 16:54:28,816 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2019-01-31 16:54:28,817 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/PointerIncrement-simplified03.bpl [2019-01-31 16:54:28,817 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/PointerIncrement-simplified03.bpl' [2019-01-31 16:54:28,862 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-01-31 16:54:28,864 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-01-31 16:54:28,865 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-01-31 16:54:28,865 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-01-31 16:54:28,865 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2019-01-31 16:54:28,883 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 31.01 04:54:28" (1/1) ... [2019-01-31 16:54:28,896 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 31.01 04:54:28" (1/1) ... [2019-01-31 16:54:28,903 WARN L165 Inliner]: Program contained no entry procedure! [2019-01-31 16:54:28,903 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2019-01-31 16:54:28,903 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2019-01-31 16:54:28,919 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-01-31 16:54:28,920 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-01-31 16:54:28,920 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-01-31 16:54:28,920 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2019-01-31 16:54:28,931 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 31.01 04:54:28" (1/1) ... [2019-01-31 16:54:28,931 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 31.01 04:54:28" (1/1) ... [2019-01-31 16:54:28,933 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 31.01 04:54:28" (1/1) ... [2019-01-31 16:54:28,933 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 31.01 04:54:28" (1/1) ... [2019-01-31 16:54:28,939 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 31.01 04:54:28" (1/1) ... [2019-01-31 16:54:28,943 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 31.01 04:54:28" (1/1) ... [2019-01-31 16:54:28,944 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 31.01 04:54:28" (1/1) ... [2019-01-31 16:54:28,946 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-01-31 16:54:28,946 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-01-31 16:54:28,946 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-01-31 16:54:28,946 INFO L276 PluginConnector]: RCFGBuilder initialized [2019-01-31 16:54:28,947 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 31.01 04:54:28" (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 [2019-01-31 16:54:29,010 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-01-31 16:54:29,011 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-01-31 16:54:29,011 INFO L130 BoogieDeclarations]: Found specification of procedure ~malloc [2019-01-31 16:54:29,206 INFO L278 CfgBuilder]: Using library mode [2019-01-31 16:54:29,207 INFO L286 CfgBuilder]: Removed 3 assue(true) statements. [2019-01-31 16:54:29,208 INFO L202 PluginConnector]: Adding new model PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 04:54:29 BoogieIcfgContainer [2019-01-31 16:54:29,208 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-01-31 16:54:29,209 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-01-31 16:54:29,210 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-01-31 16:54:29,213 INFO L276 PluginConnector]: TraceAbstraction initialized [2019-01-31 16:54:29,213 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 31.01 04:54:28" (1/2) ... [2019-01-31 16:54:29,214 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e0cbde and model type PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 04:54:29, skipping insertion in model container [2019-01-31 16:54:29,214 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 04:54:29" (2/2) ... [2019-01-31 16:54:29,216 INFO L112 eAbstractionObserver]: Analyzing ICFG PointerIncrement-simplified03.bpl [2019-01-31 16:54:29,226 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-01-31 16:54:29,234 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-01-31 16:54:29,252 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-01-31 16:54:29,283 INFO L382 AbstractCegarLoop]: Interprodecural is true [2019-01-31 16:54:29,283 INFO L383 AbstractCegarLoop]: Hoare is true [2019-01-31 16:54:29,284 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-01-31 16:54:29,284 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-01-31 16:54:29,284 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-01-31 16:54:29,284 INFO L387 AbstractCegarLoop]: Difference is false [2019-01-31 16:54:29,284 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-01-31 16:54:29,284 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-01-31 16:54:29,299 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2019-01-31 16:54:29,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2019-01-31 16:54:29,306 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:29,306 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2019-01-31 16:54:29,310 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:29,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:29,317 INFO L82 PathProgramCache]: Analyzing trace with hash 29984, now seen corresponding path program 1 times [2019-01-31 16:54:29,319 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:29,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:29,372 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:54:29,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:29,372 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:29,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:29,542 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:29,545 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-01-31 16:54:29,545 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2019-01-31 16:54:29,546 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-01-31 16:54:29,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-01-31 16:54:29,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-01-31 16:54:29,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-01-31 16:54:29,574 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2019-01-31 16:54:29,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:29,716 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2019-01-31 16:54:29,716 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-01-31 16:54:29,718 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2019-01-31 16:54:29,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:29,728 INFO L225 Difference]: With dead ends: 15 [2019-01-31 16:54:29,728 INFO L226 Difference]: Without dead ends: 8 [2019-01-31 16:54:29,732 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 [2019-01-31 16:54:29,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2019-01-31 16:54:29,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 7. [2019-01-31 16:54:29,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2019-01-31 16:54:29,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2019-01-31 16:54:29,767 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 3 [2019-01-31 16:54:29,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:29,767 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2019-01-31 16:54:29,767 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-01-31 16:54:29,768 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2019-01-31 16:54:29,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-01-31 16:54:29,768 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:29,768 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2019-01-31 16:54:29,768 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:29,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:29,769 INFO L82 PathProgramCache]: Analyzing trace with hash 893294860, now seen corresponding path program 1 times [2019-01-31 16:54:29,769 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:29,770 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:29,771 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:54:29,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:29,771 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:29,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:29,855 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:29,855 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:29,855 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:29,856 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 7 with the following transitions: [2019-01-31 16:54:29,858 INFO L207 CegarAbsIntRunner]: [0], [6], [7], [8], [12] [2019-01-31 16:54:29,914 INFO L148 AbstractInterpreter]: Using domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2019-01-31 16:54:29,914 INFO L101 FixpointEngine]: Starting fixpoint engine with domain CompoundDomain (maxUnwinding=3, maxParallelStates=2) [2019-01-31 16:54:30,035 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-01-31 16:54:30,037 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. [2019-01-31 16:54:30,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:30,044 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-01-31 16:54:30,044 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:30,044 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 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 [2019-01-31 16:54:30,082 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:54:30,082 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:54:30,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:30,123 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:30,164 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 [2019-01-31 16:54:30,166 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:30,190 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:30,190 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:30,262 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:30,262 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:30,314 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:30,335 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:30,335 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2019-01-31 16:54:30,335 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:30,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-01-31 16:54:30,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-01-31 16:54:30,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2019-01-31 16:54:30,337 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 6 states. [2019-01-31 16:54:30,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:30,465 INFO L93 Difference]: Finished difference Result 12 states and 12 transitions. [2019-01-31 16:54:30,466 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-01-31 16:54:30,466 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2019-01-31 16:54:30,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:30,466 INFO L225 Difference]: With dead ends: 12 [2019-01-31 16:54:30,467 INFO L226 Difference]: Without dead ends: 11 [2019-01-31 16:54:30,468 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 [2019-01-31 16:54:30,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2019-01-31 16:54:30,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 10. [2019-01-31 16:54:30,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2019-01-31 16:54:30,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2019-01-31 16:54:30,471 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 6 [2019-01-31 16:54:30,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:30,471 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2019-01-31 16:54:30,472 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-01-31 16:54:30,472 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2019-01-31 16:54:30,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-01-31 16:54:30,472 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:30,472 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1] [2019-01-31 16:54:30,473 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:30,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:30,473 INFO L82 PathProgramCache]: Analyzing trace with hash 529849760, now seen corresponding path program 2 times [2019-01-31 16:54:30,473 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:30,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:30,474 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:54:30,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:30,475 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:30,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:30,684 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:30,684 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:30,684 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:30,684 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:30,685 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:30,686 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:30,686 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 [2019-01-31 16:54:30,704 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:54:30,704 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:54:30,757 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-01-31 16:54:30,757 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:54:30,759 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:30,787 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 [2019-01-31 16:54:30,787 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:30,851 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:30,852 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:31,015 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:31,016 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:31,116 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:31,137 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:31,137 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2019-01-31 16:54:31,137 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:31,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-01-31 16:54:31,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-01-31 16:54:31,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2019-01-31 16:54:31,139 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 8 states. [2019-01-31 16:54:31,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:31,274 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2019-01-31 16:54:31,276 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-01-31 16:54:31,276 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 9 [2019-01-31 16:54:31,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:31,277 INFO L225 Difference]: With dead ends: 15 [2019-01-31 16:54:31,278 INFO L226 Difference]: Without dead ends: 14 [2019-01-31 16:54:31,279 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2019-01-31 16:54:31,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-01-31 16:54:31,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2019-01-31 16:54:31,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-01-31 16:54:31,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-01-31 16:54:31,284 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 9 [2019-01-31 16:54:31,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:31,284 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-01-31 16:54:31,284 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-01-31 16:54:31,284 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-01-31 16:54:31,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-01-31 16:54:31,285 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:31,285 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1] [2019-01-31 16:54:31,285 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:31,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:31,286 INFO L82 PathProgramCache]: Analyzing trace with hash 749428876, now seen corresponding path program 3 times [2019-01-31 16:54:31,286 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:31,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:31,287 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:54:31,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:31,287 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:31,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:31,365 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:31,365 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:31,365 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:31,365 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:31,366 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:31,366 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:31,366 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 [2019-01-31 16:54:31,380 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:54:31,380 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:54:31,404 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:54:31,405 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:54:31,406 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:31,414 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 [2019-01-31 16:54:31,415 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:31,423 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:31,424 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:31,514 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:31,515 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:31,588 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:31,609 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:31,609 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2019-01-31 16:54:31,609 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:31,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-01-31 16:54:31,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-01-31 16:54:31,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=97, Unknown=0, NotChecked=0, Total=182 [2019-01-31 16:54:31,610 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 10 states. [2019-01-31 16:54:31,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:31,940 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2019-01-31 16:54:31,940 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-01-31 16:54:31,940 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 12 [2019-01-31 16:54:31,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:31,941 INFO L225 Difference]: With dead ends: 18 [2019-01-31 16:54:31,941 INFO L226 Difference]: Without dead ends: 17 [2019-01-31 16:54:31,942 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=97, Unknown=0, NotChecked=0, Total=182 [2019-01-31 16:54:31,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-01-31 16:54:31,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2019-01-31 16:54:31,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-01-31 16:54:31,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2019-01-31 16:54:31,946 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 12 [2019-01-31 16:54:31,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:31,946 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2019-01-31 16:54:31,947 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-01-31 16:54:31,947 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2019-01-31 16:54:31,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-01-31 16:54:31,947 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:31,948 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1] [2019-01-31 16:54:31,948 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:31,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:31,948 INFO L82 PathProgramCache]: Analyzing trace with hash 995681824, now seen corresponding path program 4 times [2019-01-31 16:54:31,948 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:31,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:31,950 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:54:31,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:31,950 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:31,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:32,091 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:32,091 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:32,091 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:32,092 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:32,092 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:32,092 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:32,092 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 [2019-01-31 16:54:32,108 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:54:32,108 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:54:32,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:32,119 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:32,131 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 [2019-01-31 16:54:32,132 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:32,149 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:32,149 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:32,251 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:32,252 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:32,350 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:32,370 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:32,370 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 15 [2019-01-31 16:54:32,370 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:32,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-01-31 16:54:32,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-01-31 16:54:32,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=146, Unknown=0, NotChecked=0, Total=272 [2019-01-31 16:54:32,372 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 12 states. [2019-01-31 16:54:32,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:32,423 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2019-01-31 16:54:32,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-01-31 16:54:32,428 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 15 [2019-01-31 16:54:32,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:32,429 INFO L225 Difference]: With dead ends: 21 [2019-01-31 16:54:32,429 INFO L226 Difference]: Without dead ends: 20 [2019-01-31 16:54:32,430 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=126, Invalid=146, Unknown=0, NotChecked=0, Total=272 [2019-01-31 16:54:32,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-01-31 16:54:32,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2019-01-31 16:54:32,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-01-31 16:54:32,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2019-01-31 16:54:32,435 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 15 [2019-01-31 16:54:32,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:32,435 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2019-01-31 16:54:32,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-01-31 16:54:32,435 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2019-01-31 16:54:32,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-01-31 16:54:32,436 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:32,436 INFO L402 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1] [2019-01-31 16:54:32,437 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:32,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:32,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1313114124, now seen corresponding path program 5 times [2019-01-31 16:54:32,437 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:32,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:32,438 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:54:32,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:32,439 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:32,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:32,556 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:32,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:32,557 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:32,557 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:32,557 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:32,558 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:32,558 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 [2019-01-31 16:54:32,567 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:54:32,567 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:54:32,607 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-01-31 16:54:32,607 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:54:32,610 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:32,619 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 [2019-01-31 16:54:32,620 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:32,632 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:32,633 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:32,802 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:32,803 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:33,008 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:33,027 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:33,027 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 18 [2019-01-31 16:54:33,027 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:33,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-01-31 16:54:33,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-01-31 16:54:33,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=205, Unknown=0, NotChecked=0, Total=380 [2019-01-31 16:54:33,029 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 14 states. [2019-01-31 16:54:33,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:33,087 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2019-01-31 16:54:33,087 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-01-31 16:54:33,088 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 18 [2019-01-31 16:54:33,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:33,089 INFO L225 Difference]: With dead ends: 24 [2019-01-31 16:54:33,089 INFO L226 Difference]: Without dead ends: 23 [2019-01-31 16:54:33,090 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 [2019-01-31 16:54:33,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-01-31 16:54:33,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2019-01-31 16:54:33,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-01-31 16:54:33,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2019-01-31 16:54:33,095 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 18 [2019-01-31 16:54:33,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:33,095 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2019-01-31 16:54:33,095 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-01-31 16:54:33,095 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2019-01-31 16:54:33,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-01-31 16:54:33,096 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:33,096 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1] [2019-01-31 16:54:33,096 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:33,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:33,097 INFO L82 PathProgramCache]: Analyzing trace with hash 420777632, now seen corresponding path program 6 times [2019-01-31 16:54:33,097 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:33,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:33,098 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:54:33,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:33,098 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:33,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:33,330 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:33,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:33,330 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:33,331 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:33,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:33,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:33,331 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 [2019-01-31 16:54:33,341 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:54:33,342 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:54:33,357 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:54:33,357 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:54:33,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:33,363 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 [2019-01-31 16:54:33,363 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:33,374 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:33,375 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:33,507 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:33,508 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:33,607 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:33,625 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:33,625 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 21 [2019-01-31 16:54:33,625 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:33,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-01-31 16:54:33,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-01-31 16:54:33,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=274, Unknown=0, NotChecked=0, Total=506 [2019-01-31 16:54:33,627 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 16 states. [2019-01-31 16:54:33,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:33,696 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2019-01-31 16:54:33,697 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-01-31 16:54:33,697 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 21 [2019-01-31 16:54:33,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:33,699 INFO L225 Difference]: With dead ends: 27 [2019-01-31 16:54:33,699 INFO L226 Difference]: Without dead ends: 26 [2019-01-31 16:54:33,700 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=232, Invalid=274, Unknown=0, NotChecked=0, Total=506 [2019-01-31 16:54:33,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-01-31 16:54:33,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2019-01-31 16:54:33,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-01-31 16:54:33,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2019-01-31 16:54:33,704 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 21 [2019-01-31 16:54:33,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:33,704 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2019-01-31 16:54:33,704 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-01-31 16:54:33,705 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2019-01-31 16:54:33,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-01-31 16:54:33,705 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:33,705 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1] [2019-01-31 16:54:33,706 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:33,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:33,706 INFO L82 PathProgramCache]: Analyzing trace with hash -1623060596, now seen corresponding path program 7 times [2019-01-31 16:54:33,706 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:33,707 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:33,707 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:54:33,707 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:33,708 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:33,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:33,918 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:33,918 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:33,918 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:33,918 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:33,919 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:33,919 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:33,919 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 [2019-01-31 16:54:33,928 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:54:33,928 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:54:33,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:33,941 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:33,950 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 [2019-01-31 16:54:33,950 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:33,958 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:33,958 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:34,138 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:34,138 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:34,274 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:34,292 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:34,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 24 [2019-01-31 16:54:34,293 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:34,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-01-31 16:54:34,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-01-31 16:54:34,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=353, Unknown=0, NotChecked=0, Total=650 [2019-01-31 16:54:34,294 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 18 states. [2019-01-31 16:54:34,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:34,458 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2019-01-31 16:54:34,458 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-01-31 16:54:34,458 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 24 [2019-01-31 16:54:34,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:34,460 INFO L225 Difference]: With dead ends: 30 [2019-01-31 16:54:34,460 INFO L226 Difference]: Without dead ends: 29 [2019-01-31 16:54:34,461 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=297, Invalid=353, Unknown=0, NotChecked=0, Total=650 [2019-01-31 16:54:34,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-01-31 16:54:34,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2019-01-31 16:54:34,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-01-31 16:54:34,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2019-01-31 16:54:34,467 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 24 [2019-01-31 16:54:34,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:34,468 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2019-01-31 16:54:34,468 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-01-31 16:54:34,468 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2019-01-31 16:54:34,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-01-31 16:54:34,469 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:34,469 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1] [2019-01-31 16:54:34,469 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:34,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:34,469 INFO L82 PathProgramCache]: Analyzing trace with hash 143644448, now seen corresponding path program 8 times [2019-01-31 16:54:34,470 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:34,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:34,470 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:54:34,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:34,471 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:34,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:34,647 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:34,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:34,648 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:34,648 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:34,648 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:34,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:34,648 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 [2019-01-31 16:54:34,668 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:54:34,668 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:54:34,696 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-01-31 16:54:34,696 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:54:34,699 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:34,716 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 [2019-01-31 16:54:34,717 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:34,726 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:34,727 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:34,855 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:34,855 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:35,028 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:35,048 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:35,048 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 27 [2019-01-31 16:54:35,048 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:35,050 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-01-31 16:54:35,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-01-31 16:54:35,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=442, Unknown=0, NotChecked=0, Total=812 [2019-01-31 16:54:35,051 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2019-01-31 16:54:35,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:35,203 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2019-01-31 16:54:35,204 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-01-31 16:54:35,204 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2019-01-31 16:54:35,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:35,205 INFO L225 Difference]: With dead ends: 33 [2019-01-31 16:54:35,206 INFO L226 Difference]: Without dead ends: 32 [2019-01-31 16:54:35,207 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 [2019-01-31 16:54:35,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-01-31 16:54:35,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2019-01-31 16:54:35,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-01-31 16:54:35,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2019-01-31 16:54:35,213 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 27 [2019-01-31 16:54:35,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:35,213 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2019-01-31 16:54:35,213 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-01-31 16:54:35,213 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2019-01-31 16:54:35,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-01-31 16:54:35,217 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:35,217 INFO L402 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1] [2019-01-31 16:54:35,217 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:35,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:35,218 INFO L82 PathProgramCache]: Analyzing trace with hash 1524365068, now seen corresponding path program 9 times [2019-01-31 16:54:35,218 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:35,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:35,219 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:54:35,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:35,220 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:35,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:35,402 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:35,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:35,403 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:35,403 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:35,403 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:35,404 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:35,404 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 [2019-01-31 16:54:35,414 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:54:35,414 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:54:35,441 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:54:35,441 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:54:35,444 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:35,462 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 [2019-01-31 16:54:35,463 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:35,551 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:35,552 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:35,937 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:35,937 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:36,372 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:36,390 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:36,390 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 30 [2019-01-31 16:54:36,390 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:36,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-01-31 16:54:36,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-01-31 16:54:36,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=541, Unknown=0, NotChecked=0, Total=992 [2019-01-31 16:54:36,392 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 22 states. [2019-01-31 16:54:36,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:36,473 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2019-01-31 16:54:36,473 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-01-31 16:54:36,473 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 30 [2019-01-31 16:54:36,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:36,475 INFO L225 Difference]: With dead ends: 36 [2019-01-31 16:54:36,475 INFO L226 Difference]: Without dead ends: 35 [2019-01-31 16:54:36,476 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=451, Invalid=541, Unknown=0, NotChecked=0, Total=992 [2019-01-31 16:54:36,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-01-31 16:54:36,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2019-01-31 16:54:36,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-01-31 16:54:36,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2019-01-31 16:54:36,481 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 30 [2019-01-31 16:54:36,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:36,481 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2019-01-31 16:54:36,481 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-01-31 16:54:36,481 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2019-01-31 16:54:36,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-01-31 16:54:36,482 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:36,482 INFO L402 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1] [2019-01-31 16:54:36,483 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:36,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:36,483 INFO L82 PathProgramCache]: Analyzing trace with hash 1670561696, now seen corresponding path program 10 times [2019-01-31 16:54:36,483 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:36,484 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:36,484 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:54:36,484 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:36,484 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:36,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:36,664 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:36,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:36,664 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:36,665 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:36,665 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:36,665 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:36,665 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 [2019-01-31 16:54:36,673 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:54:36,674 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:54:36,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:36,700 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:36,718 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 [2019-01-31 16:54:36,719 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:36,820 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:36,821 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:37,162 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:37,163 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:37,365 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:37,389 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:37,390 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 33 [2019-01-31 16:54:37,390 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:37,390 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-01-31 16:54:37,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-01-31 16:54:37,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=650, Unknown=0, NotChecked=0, Total=1190 [2019-01-31 16:54:37,391 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 24 states. [2019-01-31 16:54:37,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:37,481 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2019-01-31 16:54:37,483 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-01-31 16:54:37,483 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 33 [2019-01-31 16:54:37,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:37,484 INFO L225 Difference]: With dead ends: 39 [2019-01-31 16:54:37,484 INFO L226 Difference]: Without dead ends: 38 [2019-01-31 16:54:37,485 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=540, Invalid=650, Unknown=0, NotChecked=0, Total=1190 [2019-01-31 16:54:37,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-01-31 16:54:37,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2019-01-31 16:54:37,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-01-31 16:54:37,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2019-01-31 16:54:37,489 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 33 [2019-01-31 16:54:37,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:37,490 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2019-01-31 16:54:37,490 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-01-31 16:54:37,490 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2019-01-31 16:54:37,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-01-31 16:54:37,491 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:37,491 INFO L402 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1] [2019-01-31 16:54:37,491 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:37,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:37,491 INFO L82 PathProgramCache]: Analyzing trace with hash 1917468300, now seen corresponding path program 11 times [2019-01-31 16:54:37,491 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:37,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:37,492 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:54:37,493 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:37,493 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:37,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:37,674 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:37,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:37,675 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:37,675 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:37,675 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:37,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:37,676 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 [2019-01-31 16:54:37,686 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:54:37,686 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:54:37,737 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-01-31 16:54:37,737 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:54:37,740 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:37,755 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 [2019-01-31 16:54:37,756 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:37,763 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:37,764 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:38,143 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:38,143 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:38,498 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:38,517 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:38,517 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 36 [2019-01-31 16:54:38,517 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:38,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-01-31 16:54:38,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-01-31 16:54:38,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=637, Invalid=769, Unknown=0, NotChecked=0, Total=1406 [2019-01-31 16:54:38,518 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 26 states. [2019-01-31 16:54:38,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:38,608 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2019-01-31 16:54:38,609 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-01-31 16:54:38,609 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 36 [2019-01-31 16:54:38,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:38,610 INFO L225 Difference]: With dead ends: 42 [2019-01-31 16:54:38,610 INFO L226 Difference]: Without dead ends: 41 [2019-01-31 16:54:38,612 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=637, Invalid=769, Unknown=0, NotChecked=0, Total=1406 [2019-01-31 16:54:38,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-01-31 16:54:38,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2019-01-31 16:54:38,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-01-31 16:54:38,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2019-01-31 16:54:38,618 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 36 [2019-01-31 16:54:38,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:38,618 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2019-01-31 16:54:38,618 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-01-31 16:54:38,618 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2019-01-31 16:54:38,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-01-31 16:54:38,619 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:38,619 INFO L402 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1] [2019-01-31 16:54:38,619 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:38,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:38,620 INFO L82 PathProgramCache]: Analyzing trace with hash 233130016, now seen corresponding path program 12 times [2019-01-31 16:54:38,620 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:38,621 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:38,621 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:54:38,621 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:38,621 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:38,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:39,030 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:39,031 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:39,031 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:39,031 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:39,032 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:39,032 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:39,032 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 [2019-01-31 16:54:39,040 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:54:39,040 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:54:39,055 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:54:39,056 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:54:39,058 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:39,062 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 [2019-01-31 16:54:39,062 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:39,067 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:39,067 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:39,269 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:39,270 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:39,551 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:39,569 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:39,570 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 39 [2019-01-31 16:54:39,570 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:39,570 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-01-31 16:54:39,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-01-31 16:54:39,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=742, Invalid=898, Unknown=0, NotChecked=0, Total=1640 [2019-01-31 16:54:39,572 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 28 states. [2019-01-31 16:54:39,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:39,657 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2019-01-31 16:54:39,659 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-01-31 16:54:39,659 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 39 [2019-01-31 16:54:39,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:39,660 INFO L225 Difference]: With dead ends: 45 [2019-01-31 16:54:39,661 INFO L226 Difference]: Without dead ends: 44 [2019-01-31 16:54:39,662 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 [2019-01-31 16:54:39,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-01-31 16:54:39,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2019-01-31 16:54:39,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-01-31 16:54:39,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2019-01-31 16:54:39,666 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 39 [2019-01-31 16:54:39,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:39,667 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2019-01-31 16:54:39,667 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-01-31 16:54:39,667 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2019-01-31 16:54:39,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-01-31 16:54:39,668 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:39,668 INFO L402 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1] [2019-01-31 16:54:39,668 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:39,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:39,669 INFO L82 PathProgramCache]: Analyzing trace with hash 214230540, now seen corresponding path program 13 times [2019-01-31 16:54:39,669 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:39,669 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:39,669 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:54:39,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:39,670 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:39,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:39,882 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:39,882 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:39,882 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:39,882 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:39,882 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:39,882 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:39,882 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 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 [2019-01-31 16:54:39,891 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:54:39,891 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:54:39,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:39,908 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:39,914 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 [2019-01-31 16:54:39,914 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:39,929 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:39,929 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:40,231 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:40,231 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:41,040 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:41,058 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:41,058 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 42 [2019-01-31 16:54:41,058 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:41,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-01-31 16:54:41,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-01-31 16:54:41,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=855, Invalid=1037, Unknown=0, NotChecked=0, Total=1892 [2019-01-31 16:54:41,060 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 30 states. [2019-01-31 16:54:41,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:41,196 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2019-01-31 16:54:41,197 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-01-31 16:54:41,197 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 42 [2019-01-31 16:54:41,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:41,198 INFO L225 Difference]: With dead ends: 48 [2019-01-31 16:54:41,198 INFO L226 Difference]: Without dead ends: 47 [2019-01-31 16:54:41,200 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 756 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=855, Invalid=1037, Unknown=0, NotChecked=0, Total=1892 [2019-01-31 16:54:41,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-01-31 16:54:41,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2019-01-31 16:54:41,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-01-31 16:54:41,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2019-01-31 16:54:41,207 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 42 [2019-01-31 16:54:41,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:41,207 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2019-01-31 16:54:41,207 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-01-31 16:54:41,207 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2019-01-31 16:54:41,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-01-31 16:54:41,208 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:41,208 INFO L402 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1] [2019-01-31 16:54:41,208 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:41,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:41,209 INFO L82 PathProgramCache]: Analyzing trace with hash -179343200, now seen corresponding path program 14 times [2019-01-31 16:54:41,209 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:41,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:41,210 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:54:41,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:41,210 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:41,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:41,519 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:41,519 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:41,519 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:41,520 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:41,520 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:41,520 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:41,520 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 [2019-01-31 16:54:41,534 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:54:41,534 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:54:41,608 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2019-01-31 16:54:41,609 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:54:41,612 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:41,617 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 [2019-01-31 16:54:41,617 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:41,626 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:41,626 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:42,586 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:42,586 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:43,170 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:43,188 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:43,188 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 45 [2019-01-31 16:54:43,189 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:43,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-01-31 16:54:43,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-01-31 16:54:43,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=976, Invalid=1186, Unknown=0, NotChecked=0, Total=2162 [2019-01-31 16:54:43,190 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 32 states. [2019-01-31 16:54:43,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:43,419 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2019-01-31 16:54:43,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-01-31 16:54:43,420 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 45 [2019-01-31 16:54:43,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:43,420 INFO L225 Difference]: With dead ends: 51 [2019-01-31 16:54:43,421 INFO L226 Difference]: Without dead ends: 50 [2019-01-31 16:54:43,422 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 870 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=976, Invalid=1186, Unknown=0, NotChecked=0, Total=2162 [2019-01-31 16:54:43,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-01-31 16:54:43,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2019-01-31 16:54:43,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-01-31 16:54:43,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2019-01-31 16:54:43,431 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 45 [2019-01-31 16:54:43,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:43,432 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2019-01-31 16:54:43,432 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-01-31 16:54:43,432 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2019-01-31 16:54:43,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-01-31 16:54:43,433 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:43,433 INFO L402 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1] [2019-01-31 16:54:43,433 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:43,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:43,433 INFO L82 PathProgramCache]: Analyzing trace with hash 126086540, now seen corresponding path program 15 times [2019-01-31 16:54:43,434 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:43,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:43,434 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:54:43,435 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:43,435 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:43,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:43,812 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:43,813 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:43,813 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:43,813 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:43,813 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:43,813 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:43,813 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 [2019-01-31 16:54:43,822 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:54:43,822 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:54:43,839 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:54:43,839 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:54:43,845 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:43,851 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 [2019-01-31 16:54:43,851 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:43,859 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:43,860 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:44,095 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:44,095 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:44,437 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:44,455 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:44,455 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 48 [2019-01-31 16:54:44,455 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:44,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-01-31 16:54:44,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-01-31 16:54:44,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1105, Invalid=1345, Unknown=0, NotChecked=0, Total=2450 [2019-01-31 16:54:44,457 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 34 states. [2019-01-31 16:54:44,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:44,563 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2019-01-31 16:54:44,564 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-01-31 16:54:44,564 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 48 [2019-01-31 16:54:44,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:44,565 INFO L225 Difference]: With dead ends: 54 [2019-01-31 16:54:44,565 INFO L226 Difference]: Without dead ends: 53 [2019-01-31 16:54:44,567 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1105, Invalid=1345, Unknown=0, NotChecked=0, Total=2450 [2019-01-31 16:54:44,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-01-31 16:54:44,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2019-01-31 16:54:44,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-01-31 16:54:44,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2019-01-31 16:54:44,571 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 48 [2019-01-31 16:54:44,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:44,572 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2019-01-31 16:54:44,572 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-01-31 16:54:44,572 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2019-01-31 16:54:44,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-01-31 16:54:44,573 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:44,573 INFO L402 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1] [2019-01-31 16:54:44,573 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:44,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:44,573 INFO L82 PathProgramCache]: Analyzing trace with hash -1852229344, now seen corresponding path program 16 times [2019-01-31 16:54:44,574 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:44,574 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:44,574 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:54:44,574 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:44,575 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:44,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:44,829 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:44,829 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:44,829 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:44,829 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:44,829 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:44,829 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:44,829 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 [2019-01-31 16:54:44,838 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:54:44,838 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:54:44,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:44,857 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:44,866 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 [2019-01-31 16:54:44,866 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:44,875 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:44,875 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:45,635 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:45,635 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:46,742 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:46,761 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:46,761 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 51 [2019-01-31 16:54:46,761 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:46,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-01-31 16:54:46,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-01-31 16:54:46,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1242, Invalid=1514, Unknown=0, NotChecked=0, Total=2756 [2019-01-31 16:54:46,763 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 36 states. [2019-01-31 16:54:46,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:46,887 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2019-01-31 16:54:46,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-01-31 16:54:46,888 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 51 [2019-01-31 16:54:46,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:46,889 INFO L225 Difference]: With dead ends: 57 [2019-01-31 16:54:46,889 INFO L226 Difference]: Without dead ends: 56 [2019-01-31 16:54:46,891 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 [2019-01-31 16:54:46,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-01-31 16:54:46,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2019-01-31 16:54:46,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-01-31 16:54:46,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2019-01-31 16:54:46,895 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 51 [2019-01-31 16:54:46,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:46,896 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2019-01-31 16:54:46,896 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-01-31 16:54:46,896 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2019-01-31 16:54:46,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-01-31 16:54:46,897 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:46,897 INFO L402 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1] [2019-01-31 16:54:46,897 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:46,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:46,898 INFO L82 PathProgramCache]: Analyzing trace with hash 1975473420, now seen corresponding path program 17 times [2019-01-31 16:54:46,898 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:46,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:46,898 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:54:46,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:46,899 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:46,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:47,602 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:47,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:47,602 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:47,602 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:47,602 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:47,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:47,602 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 [2019-01-31 16:54:47,610 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:54:47,611 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:54:47,647 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2019-01-31 16:54:47,647 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:54:47,651 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:47,655 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 [2019-01-31 16:54:47,655 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:47,665 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:47,665 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:47,954 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:47,954 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:48,690 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:48,709 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:48,710 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 54 [2019-01-31 16:54:48,710 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:48,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-01-31 16:54:48,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-01-31 16:54:48,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1387, Invalid=1693, Unknown=0, NotChecked=0, Total=3080 [2019-01-31 16:54:48,712 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 38 states. [2019-01-31 16:54:48,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:48,829 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2019-01-31 16:54:48,829 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-01-31 16:54:48,830 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 54 [2019-01-31 16:54:48,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:48,830 INFO L225 Difference]: With dead ends: 60 [2019-01-31 16:54:48,830 INFO L226 Difference]: Without dead ends: 59 [2019-01-31 16:54:48,832 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1260 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1387, Invalid=1693, Unknown=0, NotChecked=0, Total=3080 [2019-01-31 16:54:48,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-01-31 16:54:48,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2019-01-31 16:54:48,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-01-31 16:54:48,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2019-01-31 16:54:48,836 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 54 [2019-01-31 16:54:48,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:48,837 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2019-01-31 16:54:48,837 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-01-31 16:54:48,837 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2019-01-31 16:54:48,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-01-31 16:54:48,838 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:48,838 INFO L402 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1] [2019-01-31 16:54:48,838 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:48,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:48,838 INFO L82 PathProgramCache]: Analyzing trace with hash 1686806944, now seen corresponding path program 18 times [2019-01-31 16:54:48,839 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:48,839 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:48,839 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:54:48,839 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:48,840 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:48,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:49,709 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:49,709 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:49,709 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:49,709 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:49,709 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:49,709 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:49,710 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 [2019-01-31 16:54:49,717 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:54:49,718 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:54:49,737 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:54:49,737 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:54:49,740 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:49,759 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 [2019-01-31 16:54:49,760 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:49,768 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:49,769 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:50,085 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:50,085 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:50,714 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:50,733 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:50,733 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 57 [2019-01-31 16:54:50,733 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:50,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2019-01-31 16:54:50,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2019-01-31 16:54:50,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1540, Invalid=1882, Unknown=0, NotChecked=0, Total=3422 [2019-01-31 16:54:50,735 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 40 states. [2019-01-31 16:54:50,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:50,854 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2019-01-31 16:54:50,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-01-31 16:54:50,855 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 57 [2019-01-31 16:54:50,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:50,856 INFO L225 Difference]: With dead ends: 63 [2019-01-31 16:54:50,856 INFO L226 Difference]: Without dead ends: 62 [2019-01-31 16:54:50,858 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1406 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1540, Invalid=1882, Unknown=0, NotChecked=0, Total=3422 [2019-01-31 16:54:50,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-01-31 16:54:50,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2019-01-31 16:54:50,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-01-31 16:54:50,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2019-01-31 16:54:50,866 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 57 [2019-01-31 16:54:50,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:50,867 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2019-01-31 16:54:50,867 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2019-01-31 16:54:50,867 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2019-01-31 16:54:50,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-01-31 16:54:50,868 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:50,868 INFO L402 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1] [2019-01-31 16:54:50,868 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:50,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:50,868 INFO L82 PathProgramCache]: Analyzing trace with hash 548347020, now seen corresponding path program 19 times [2019-01-31 16:54:50,869 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:50,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:50,869 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:54:50,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:50,870 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:50,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:51,165 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:51,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:51,166 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:51,166 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:51,166 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:51,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:51,166 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 [2019-01-31 16:54:51,175 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:54:51,175 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:54:51,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:51,197 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:51,205 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 [2019-01-31 16:54:51,205 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:51,219 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:51,219 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:51,496 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:51,497 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:52,075 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:52,093 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:52,093 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 60 [2019-01-31 16:54:52,093 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:52,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2019-01-31 16:54:52,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2019-01-31 16:54:52,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1701, Invalid=2081, Unknown=0, NotChecked=0, Total=3782 [2019-01-31 16:54:52,095 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 42 states. [2019-01-31 16:54:52,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:52,244 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2019-01-31 16:54:52,245 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-01-31 16:54:52,245 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 60 [2019-01-31 16:54:52,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:52,246 INFO L225 Difference]: With dead ends: 66 [2019-01-31 16:54:52,246 INFO L226 Difference]: Without dead ends: 65 [2019-01-31 16:54:52,248 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1560 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1701, Invalid=2081, Unknown=0, NotChecked=0, Total=3782 [2019-01-31 16:54:52,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2019-01-31 16:54:52,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2019-01-31 16:54:52,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-01-31 16:54:52,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 64 transitions. [2019-01-31 16:54:52,252 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 64 transitions. Word has length 60 [2019-01-31 16:54:52,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:52,252 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 64 transitions. [2019-01-31 16:54:52,252 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2019-01-31 16:54:52,252 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 64 transitions. [2019-01-31 16:54:52,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-01-31 16:54:52,253 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:52,253 INFO L402 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1] [2019-01-31 16:54:52,254 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:52,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:52,254 INFO L82 PathProgramCache]: Analyzing trace with hash 2045487648, now seen corresponding path program 20 times [2019-01-31 16:54:52,254 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:52,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:52,255 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:54:52,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:52,255 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:52,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:52,557 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:52,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:52,557 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:52,557 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:52,557 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:52,558 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:52,558 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 [2019-01-31 16:54:52,565 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:54:52,566 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:54:52,603 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2019-01-31 16:54:52,604 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:54:52,607 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:52,626 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 [2019-01-31 16:54:52,627 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:52,634 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:52,634 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:53,026 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:53,026 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:53,934 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:53,953 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:53,953 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 63 [2019-01-31 16:54:53,953 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:53,953 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-01-31 16:54:53,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-01-31 16:54:53,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1870, Invalid=2290, Unknown=0, NotChecked=0, Total=4160 [2019-01-31 16:54:53,955 INFO L87 Difference]: Start difference. First operand 64 states and 64 transitions. Second operand 44 states. [2019-01-31 16:54:54,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:54,131 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2019-01-31 16:54:54,132 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-01-31 16:54:54,132 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 63 [2019-01-31 16:54:54,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:54,133 INFO L225 Difference]: With dead ends: 69 [2019-01-31 16:54:54,133 INFO L226 Difference]: Without dead ends: 68 [2019-01-31 16:54:54,135 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 [2019-01-31 16:54:54,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-01-31 16:54:54,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2019-01-31 16:54:54,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-01-31 16:54:54,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2019-01-31 16:54:54,139 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 63 [2019-01-31 16:54:54,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:54,139 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2019-01-31 16:54:54,139 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-01-31 16:54:54,140 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2019-01-31 16:54:54,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2019-01-31 16:54:54,140 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:54,140 INFO L402 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1] [2019-01-31 16:54:54,141 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:54,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:54,141 INFO L82 PathProgramCache]: Analyzing trace with hash 126567436, now seen corresponding path program 21 times [2019-01-31 16:54:54,141 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:54,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:54,142 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:54:54,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:54,142 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:54,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:54,780 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:54,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:54,780 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:54,780 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:54,780 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:54,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:54,780 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 [2019-01-31 16:54:54,789 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:54:54,789 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:54:54,811 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:54:54,812 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:54:54,814 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:54,833 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 [2019-01-31 16:54:54,834 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:54,856 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:54,857 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:55,220 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:55,220 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:55,890 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:55,908 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:55,908 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 66 [2019-01-31 16:54:55,908 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:55,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2019-01-31 16:54:55,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2019-01-31 16:54:55,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2047, Invalid=2509, Unknown=0, NotChecked=0, Total=4556 [2019-01-31 16:54:55,910 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 46 states. [2019-01-31 16:54:56,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:56,050 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2019-01-31 16:54:56,053 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-01-31 16:54:56,053 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 66 [2019-01-31 16:54:56,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:56,054 INFO L225 Difference]: With dead ends: 72 [2019-01-31 16:54:56,054 INFO L226 Difference]: Without dead ends: 71 [2019-01-31 16:54:56,055 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1892 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2047, Invalid=2509, Unknown=0, NotChecked=0, Total=4556 [2019-01-31 16:54:56,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2019-01-31 16:54:56,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2019-01-31 16:54:56,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-01-31 16:54:56,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2019-01-31 16:54:56,058 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 66 [2019-01-31 16:54:56,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:56,058 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2019-01-31 16:54:56,059 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2019-01-31 16:54:56,059 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2019-01-31 16:54:56,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-01-31 16:54:56,059 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:56,059 INFO L402 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1] [2019-01-31 16:54:56,059 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:56,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:56,060 INFO L82 PathProgramCache]: Analyzing trace with hash -410758496, now seen corresponding path program 22 times [2019-01-31 16:54:56,060 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:56,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:56,060 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:54:56,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:56,060 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:56,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:56,470 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:56,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:56,471 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:56,471 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:56,471 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:56,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:56,471 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 [2019-01-31 16:54:56,479 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:54:56,480 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:54:56,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:56,513 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:56,520 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 [2019-01-31 16:54:56,520 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:56,529 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:56,530 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:56,894 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:56,894 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:57,685 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:57,705 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:57,705 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 69 [2019-01-31 16:54:57,705 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:57,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2019-01-31 16:54:57,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2019-01-31 16:54:57,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2232, Invalid=2738, Unknown=0, NotChecked=0, Total=4970 [2019-01-31 16:54:57,707 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 48 states. [2019-01-31 16:54:57,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:57,878 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2019-01-31 16:54:57,879 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-01-31 16:54:57,879 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 69 [2019-01-31 16:54:57,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:57,880 INFO L225 Difference]: With dead ends: 75 [2019-01-31 16:54:57,880 INFO L226 Difference]: Without dead ends: 74 [2019-01-31 16:54:57,881 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 [2019-01-31 16:54:57,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-01-31 16:54:57,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2019-01-31 16:54:57,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-01-31 16:54:57,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2019-01-31 16:54:57,885 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 69 [2019-01-31 16:54:57,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:57,885 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2019-01-31 16:54:57,886 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2019-01-31 16:54:57,886 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2019-01-31 16:54:57,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-01-31 16:54:57,886 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:57,886 INFO L402 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1] [2019-01-31 16:54:57,886 INFO L423 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:57,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:57,887 INFO L82 PathProgramCache]: Analyzing trace with hash -544486516, now seen corresponding path program 23 times [2019-01-31 16:54:57,887 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:57,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:57,887 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:54:57,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:57,888 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:57,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:54:58,274 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:58,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:58,275 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:54:58,275 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:54:58,275 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:54:58,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:54:58,275 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 [2019-01-31 16:54:58,284 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:54:58,284 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:54:58,335 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2019-01-31 16:54:58,335 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:54:58,338 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:54:58,340 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 [2019-01-31 16:54:58,341 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:54:58,359 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:54:58,359 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:54:58,757 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:58,758 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:54:59,508 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:54:59,528 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:54:59,529 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 72 [2019-01-31 16:54:59,529 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:54:59,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2019-01-31 16:54:59,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2019-01-31 16:54:59,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2019-01-31 16:54:59,530 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 50 states. [2019-01-31 16:54:59,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:54:59,698 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2019-01-31 16:54:59,704 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-01-31 16:54:59,704 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 72 [2019-01-31 16:54:59,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:54:59,705 INFO L225 Difference]: With dead ends: 78 [2019-01-31 16:54:59,705 INFO L226 Difference]: Without dead ends: 77 [2019-01-31 16:54:59,706 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2256 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2019-01-31 16:54:59,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2019-01-31 16:54:59,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2019-01-31 16:54:59,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-01-31 16:54:59,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 76 transitions. [2019-01-31 16:54:59,711 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 76 transitions. Word has length 72 [2019-01-31 16:54:59,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:54:59,711 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 76 transitions. [2019-01-31 16:54:59,711 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2019-01-31 16:54:59,712 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 76 transitions. [2019-01-31 16:54:59,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-01-31 16:54:59,712 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:54:59,712 INFO L402 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1] [2019-01-31 16:54:59,713 INFO L423 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:54:59,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:54:59,713 INFO L82 PathProgramCache]: Analyzing trace with hash 1293720352, now seen corresponding path program 24 times [2019-01-31 16:54:59,713 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:54:59,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:59,717 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:54:59,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:54:59,717 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:54:59,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:00,107 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:00,107 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:00,108 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:55:00,108 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:55:00,108 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:55:00,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:00,108 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 [2019-01-31 16:55:00,117 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:55:00,117 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:55:00,141 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:55:00,142 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:55:00,145 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:55:00,148 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 [2019-01-31 16:55:00,148 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:55:00,157 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:55:00,157 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:55:00,599 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:00,599 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:55:01,453 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:01,471 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:55:01,471 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 75 [2019-01-31 16:55:01,472 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:55:01,472 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2019-01-31 16:55:01,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2019-01-31 16:55:01,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=3226, Unknown=0, NotChecked=0, Total=5852 [2019-01-31 16:55:01,473 INFO L87 Difference]: Start difference. First operand 76 states and 76 transitions. Second operand 52 states. [2019-01-31 16:55:01,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:55:01,669 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2019-01-31 16:55:01,670 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-01-31 16:55:01,670 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 75 [2019-01-31 16:55:01,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:55:01,671 INFO L225 Difference]: With dead ends: 81 [2019-01-31 16:55:01,671 INFO L226 Difference]: Without dead ends: 80 [2019-01-31 16:55:01,672 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 [2019-01-31 16:55:01,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2019-01-31 16:55:01,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2019-01-31 16:55:01,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2019-01-31 16:55:01,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2019-01-31 16:55:01,676 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 75 [2019-01-31 16:55:01,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:55:01,677 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2019-01-31 16:55:01,677 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2019-01-31 16:55:01,677 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2019-01-31 16:55:01,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-01-31 16:55:01,678 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:55:01,678 INFO L402 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1] [2019-01-31 16:55:01,678 INFO L423 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:55:01,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:55:01,678 INFO L82 PathProgramCache]: Analyzing trace with hash -1813466356, now seen corresponding path program 25 times [2019-01-31 16:55:01,678 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:55:01,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:01,679 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:55:01,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:01,679 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:55:01,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:02,147 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:02,147 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:02,147 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:55:02,148 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:55:02,148 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:55:02,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:02,148 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 [2019-01-31 16:55:02,157 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:55:02,157 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:55:02,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:02,180 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:55:02,182 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 [2019-01-31 16:55:02,183 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:55:02,186 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:55:02,187 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:55:02,653 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:02,653 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:55:03,835 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:03,853 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:55:03,854 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 78 [2019-01-31 16:55:03,854 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:55:03,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2019-01-31 16:55:03,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2019-01-31 16:55:03,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2835, Invalid=3485, Unknown=0, NotChecked=0, Total=6320 [2019-01-31 16:55:03,856 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 54 states. [2019-01-31 16:55:04,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:55:04,055 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2019-01-31 16:55:04,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-01-31 16:55:04,056 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 78 [2019-01-31 16:55:04,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:55:04,057 INFO L225 Difference]: With dead ends: 84 [2019-01-31 16:55:04,057 INFO L226 Difference]: Without dead ends: 83 [2019-01-31 16:55:04,058 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2652 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2835, Invalid=3485, Unknown=0, NotChecked=0, Total=6320 [2019-01-31 16:55:04,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2019-01-31 16:55:04,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2019-01-31 16:55:04,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-01-31 16:55:04,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 82 transitions. [2019-01-31 16:55:04,062 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 82 transitions. Word has length 78 [2019-01-31 16:55:04,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:55:04,062 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 82 transitions. [2019-01-31 16:55:04,062 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2019-01-31 16:55:04,062 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 82 transitions. [2019-01-31 16:55:04,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2019-01-31 16:55:04,063 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:55:04,063 INFO L402 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1] [2019-01-31 16:55:04,064 INFO L423 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:55:04,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:55:04,064 INFO L82 PathProgramCache]: Analyzing trace with hash 1417446304, now seen corresponding path program 26 times [2019-01-31 16:55:04,064 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:55:04,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:04,065 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:55:04,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:04,065 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:55:04,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:04,584 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:04,585 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:04,585 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:55:04,585 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:55:04,585 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:55:04,585 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:04,585 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 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 [2019-01-31 16:55:04,594 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:55:04,594 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:55:04,648 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2019-01-31 16:55:04,648 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:55:04,651 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:55:04,655 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 [2019-01-31 16:55:04,655 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:55:04,663 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:55:04,663 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:55:05,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:05,358 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:55:06,273 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:06,293 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:55:06,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 81 [2019-01-31 16:55:06,293 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:55:06,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2019-01-31 16:55:06,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2019-01-31 16:55:06,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3052, Invalid=3754, Unknown=0, NotChecked=0, Total=6806 [2019-01-31 16:55:06,295 INFO L87 Difference]: Start difference. First operand 82 states and 82 transitions. Second operand 56 states. [2019-01-31 16:55:06,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:55:06,472 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2019-01-31 16:55:06,472 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-01-31 16:55:06,472 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 81 [2019-01-31 16:55:06,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:55:06,473 INFO L225 Difference]: With dead ends: 87 [2019-01-31 16:55:06,473 INFO L226 Difference]: Without dead ends: 86 [2019-01-31 16:55:06,473 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2862 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3052, Invalid=3754, Unknown=0, NotChecked=0, Total=6806 [2019-01-31 16:55:06,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2019-01-31 16:55:06,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2019-01-31 16:55:06,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2019-01-31 16:55:06,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2019-01-31 16:55:06,476 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 81 [2019-01-31 16:55:06,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:55:06,476 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2019-01-31 16:55:06,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2019-01-31 16:55:06,476 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2019-01-31 16:55:06,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-01-31 16:55:06,477 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:55:06,477 INFO L402 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1] [2019-01-31 16:55:06,477 INFO L423 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:55:06,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:55:06,478 INFO L82 PathProgramCache]: Analyzing trace with hash -975570292, now seen corresponding path program 27 times [2019-01-31 16:55:06,478 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:55:06,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:06,478 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:55:06,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:06,479 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:55:06,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:06,976 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:06,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:06,976 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:55:06,976 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:55:06,976 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:55:06,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:06,976 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 [2019-01-31 16:55:06,987 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:55:06,987 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:55:07,012 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:55:07,012 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:55:07,015 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:55:07,018 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 [2019-01-31 16:55:07,018 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:55:07,027 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:55:07,027 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:55:07,551 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:07,551 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:55:08,816 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:08,834 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:55:08,834 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 84 [2019-01-31 16:55:08,834 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:55:08,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2019-01-31 16:55:08,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2019-01-31 16:55:08,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3277, Invalid=4033, Unknown=0, NotChecked=0, Total=7310 [2019-01-31 16:55:08,835 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 58 states. [2019-01-31 16:55:09,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:55:09,016 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2019-01-31 16:55:09,017 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-01-31 16:55:09,017 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 84 [2019-01-31 16:55:09,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:55:09,018 INFO L225 Difference]: With dead ends: 90 [2019-01-31 16:55:09,018 INFO L226 Difference]: Without dead ends: 89 [2019-01-31 16:55:09,018 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3080 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=3277, Invalid=4033, Unknown=0, NotChecked=0, Total=7310 [2019-01-31 16:55:09,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-01-31 16:55:09,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2019-01-31 16:55:09,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-01-31 16:55:09,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 88 transitions. [2019-01-31 16:55:09,022 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 88 transitions. Word has length 84 [2019-01-31 16:55:09,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:55:09,022 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 88 transitions. [2019-01-31 16:55:09,022 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2019-01-31 16:55:09,022 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 88 transitions. [2019-01-31 16:55:09,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-01-31 16:55:09,023 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:55:09,023 INFO L402 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1] [2019-01-31 16:55:09,023 INFO L423 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:55:09,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:55:09,024 INFO L82 PathProgramCache]: Analyzing trace with hash 829164576, now seen corresponding path program 28 times [2019-01-31 16:55:09,024 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:55:09,024 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:09,024 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:55:09,025 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:09,025 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:55:09,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:09,728 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:09,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:09,728 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:55:09,728 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:55:09,728 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:55:09,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:09,728 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 [2019-01-31 16:55:09,738 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:55:09,738 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:55:09,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:09,765 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:55:09,781 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 [2019-01-31 16:55:09,781 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:55:09,796 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:55:09,797 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:55:10,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:10,614 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:55:11,653 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:11,673 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:55:11,673 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 87 [2019-01-31 16:55:11,673 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:55:11,673 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2019-01-31 16:55:11,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2019-01-31 16:55:11,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3510, Invalid=4322, Unknown=0, NotChecked=0, Total=7832 [2019-01-31 16:55:11,674 INFO L87 Difference]: Start difference. First operand 88 states and 88 transitions. Second operand 60 states. [2019-01-31 16:55:11,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:55:11,892 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2019-01-31 16:55:11,893 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-01-31 16:55:11,893 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 87 [2019-01-31 16:55:11,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:55:11,894 INFO L225 Difference]: With dead ends: 93 [2019-01-31 16:55:11,895 INFO L226 Difference]: Without dead ends: 92 [2019-01-31 16:55:11,896 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3306 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3510, Invalid=4322, Unknown=0, NotChecked=0, Total=7832 [2019-01-31 16:55:11,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2019-01-31 16:55:11,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2019-01-31 16:55:11,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2019-01-31 16:55:11,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2019-01-31 16:55:11,901 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 87 [2019-01-31 16:55:11,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:55:11,901 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2019-01-31 16:55:11,902 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2019-01-31 16:55:11,902 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2019-01-31 16:55:11,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2019-01-31 16:55:11,902 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:55:11,902 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1] [2019-01-31 16:55:11,903 INFO L423 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:55:11,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:55:11,903 INFO L82 PathProgramCache]: Analyzing trace with hash 1285005836, now seen corresponding path program 29 times [2019-01-31 16:55:11,903 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:55:11,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:11,904 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:55:11,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:11,904 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:55:11,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:12,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:12,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:12,422 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:55:12,422 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:55:12,422 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:55:12,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:12,423 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 [2019-01-31 16:55:12,431 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:55:12,431 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:55:12,496 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2019-01-31 16:55:12,496 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:55:12,500 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:55:12,504 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 [2019-01-31 16:55:12,505 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:55:12,528 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:55:12,528 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:55:13,092 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:13,092 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:55:14,607 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:14,626 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:55:14,626 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 90 [2019-01-31 16:55:14,626 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:55:14,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2019-01-31 16:55:14,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2019-01-31 16:55:14,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3751, Invalid=4621, Unknown=0, NotChecked=0, Total=8372 [2019-01-31 16:55:14,628 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 62 states. [2019-01-31 16:55:14,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:55:14,831 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2019-01-31 16:55:14,831 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-01-31 16:55:14,832 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 90 [2019-01-31 16:55:14,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:55:14,833 INFO L225 Difference]: With dead ends: 96 [2019-01-31 16:55:14,833 INFO L226 Difference]: Without dead ends: 95 [2019-01-31 16:55:14,834 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3540 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3751, Invalid=4621, Unknown=0, NotChecked=0, Total=8372 [2019-01-31 16:55:14,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2019-01-31 16:55:14,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2019-01-31 16:55:14,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2019-01-31 16:55:14,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 94 transitions. [2019-01-31 16:55:14,838 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 94 transitions. Word has length 90 [2019-01-31 16:55:14,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:55:14,838 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 94 transitions. [2019-01-31 16:55:14,838 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2019-01-31 16:55:14,838 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 94 transitions. [2019-01-31 16:55:14,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-01-31 16:55:14,838 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:55:14,839 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1] [2019-01-31 16:55:14,839 INFO L423 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:55:14,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:55:14,839 INFO L82 PathProgramCache]: Analyzing trace with hash 565392544, now seen corresponding path program 30 times [2019-01-31 16:55:14,839 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:55:14,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:14,840 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:55:14,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:14,840 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:55:14,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:15,493 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:15,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:15,494 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:55:15,494 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:55:15,494 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:55:15,494 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:15,494 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 [2019-01-31 16:55:15,505 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:55:15,505 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:55:15,534 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:55:15,534 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:55:15,538 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:55:15,540 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 [2019-01-31 16:55:15,540 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:55:15,552 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:55:15,552 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:55:16,173 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:16,173 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:55:17,397 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:17,415 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:55:17,416 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 93 [2019-01-31 16:55:17,416 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:55:17,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2019-01-31 16:55:17,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2019-01-31 16:55:17,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4000, Invalid=4930, Unknown=0, NotChecked=0, Total=8930 [2019-01-31 16:55:17,417 INFO L87 Difference]: Start difference. First operand 94 states and 94 transitions. Second operand 64 states. [2019-01-31 16:55:17,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:55:17,603 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2019-01-31 16:55:17,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-01-31 16:55:17,604 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 93 [2019-01-31 16:55:17,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:55:17,605 INFO L225 Difference]: With dead ends: 99 [2019-01-31 16:55:17,605 INFO L226 Difference]: Without dead ends: 98 [2019-01-31 16:55:17,606 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3782 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=4000, Invalid=4930, Unknown=0, NotChecked=0, Total=8930 [2019-01-31 16:55:17,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2019-01-31 16:55:17,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2019-01-31 16:55:17,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2019-01-31 16:55:17,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2019-01-31 16:55:17,610 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 93 [2019-01-31 16:55:17,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:55:17,610 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2019-01-31 16:55:17,610 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2019-01-31 16:55:17,610 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2019-01-31 16:55:17,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2019-01-31 16:55:17,610 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:55:17,611 INFO L402 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1] [2019-01-31 16:55:17,611 INFO L423 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:55:17,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:55:17,611 INFO L82 PathProgramCache]: Analyzing trace with hash -1252415092, now seen corresponding path program 31 times [2019-01-31 16:55:17,611 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:55:17,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:17,612 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:55:17,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:17,612 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:55:17,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:18,245 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:18,245 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:18,246 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:55:18,246 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:55:18,246 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:55:18,246 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:18,246 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 [2019-01-31 16:55:18,254 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:55:18,254 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:55:18,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:18,287 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:55:18,303 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 [2019-01-31 16:55:18,304 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:55:18,327 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:55:18,328 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:55:19,268 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:19,268 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:55:20,533 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:20,551 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:55:20,552 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 96 [2019-01-31 16:55:20,552 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:55:20,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2019-01-31 16:55:20,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2019-01-31 16:55:20,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4257, Invalid=5249, Unknown=0, NotChecked=0, Total=9506 [2019-01-31 16:55:20,553 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 66 states. [2019-01-31 16:55:20,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:55:20,759 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2019-01-31 16:55:20,759 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-01-31 16:55:20,760 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 96 [2019-01-31 16:55:20,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:55:20,761 INFO L225 Difference]: With dead ends: 102 [2019-01-31 16:55:20,761 INFO L226 Difference]: Without dead ends: 101 [2019-01-31 16:55:20,762 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 [2019-01-31 16:55:20,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2019-01-31 16:55:20,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2019-01-31 16:55:20,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2019-01-31 16:55:20,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 100 transitions. [2019-01-31 16:55:20,767 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 100 transitions. Word has length 96 [2019-01-31 16:55:20,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:55:20,767 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 100 transitions. [2019-01-31 16:55:20,767 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2019-01-31 16:55:20,767 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 100 transitions. [2019-01-31 16:55:20,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2019-01-31 16:55:20,768 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:55:20,768 INFO L402 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1] [2019-01-31 16:55:20,768 INFO L423 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:55:20,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:55:20,769 INFO L82 PathProgramCache]: Analyzing trace with hash -317063904, now seen corresponding path program 32 times [2019-01-31 16:55:20,769 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:55:20,769 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:20,770 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:55:20,770 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:20,770 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:55:20,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:21,437 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:21,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:21,438 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:55:21,438 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:55:21,438 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:55:21,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:21,439 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 [2019-01-31 16:55:21,448 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:55:21,448 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:55:21,523 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2019-01-31 16:55:21,523 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:55:21,527 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:55:21,538 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 [2019-01-31 16:55:21,538 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:55:21,547 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:55:21,548 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:55:22,410 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:22,411 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:55:23,759 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:23,777 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:55:23,778 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 99 [2019-01-31 16:55:23,778 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:55:23,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2019-01-31 16:55:23,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2019-01-31 16:55:23,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4522, Invalid=5578, Unknown=0, NotChecked=0, Total=10100 [2019-01-31 16:55:23,780 INFO L87 Difference]: Start difference. First operand 100 states and 100 transitions. Second operand 68 states. [2019-01-31 16:55:24,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:55:24,125 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2019-01-31 16:55:24,125 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-01-31 16:55:24,126 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 99 [2019-01-31 16:55:24,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:55:24,127 INFO L225 Difference]: With dead ends: 105 [2019-01-31 16:55:24,127 INFO L226 Difference]: Without dead ends: 104 [2019-01-31 16:55:24,128 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 [2019-01-31 16:55:24,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2019-01-31 16:55:24,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2019-01-31 16:55:24,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2019-01-31 16:55:24,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2019-01-31 16:55:24,132 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 99 [2019-01-31 16:55:24,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:55:24,133 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2019-01-31 16:55:24,133 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2019-01-31 16:55:24,133 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2019-01-31 16:55:24,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2019-01-31 16:55:24,134 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:55:24,134 INFO L402 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1] [2019-01-31 16:55:24,134 INFO L423 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:55:24,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:55:24,134 INFO L82 PathProgramCache]: Analyzing trace with hash -1017638644, now seen corresponding path program 33 times [2019-01-31 16:55:24,134 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:55:24,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:24,135 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:55:24,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:24,135 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:55:24,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:24,867 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:24,867 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:24,867 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:55:24,867 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:55:24,867 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:55:24,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:24,868 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 [2019-01-31 16:55:24,886 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:55:24,886 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:55:24,917 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:55:24,917 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:55:24,921 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:55:24,938 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 [2019-01-31 16:55:24,939 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:55:25,019 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:55:25,020 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:55:25,966 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:25,966 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:55:27,439 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:27,457 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:55:27,457 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 102 [2019-01-31 16:55:27,457 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:55:27,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2019-01-31 16:55:27,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2019-01-31 16:55:27,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4795, Invalid=5917, Unknown=0, NotChecked=0, Total=10712 [2019-01-31 16:55:27,459 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 70 states. [2019-01-31 16:55:27,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:55:27,746 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2019-01-31 16:55:27,747 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-01-31 16:55:27,747 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 102 [2019-01-31 16:55:27,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:55:27,748 INFO L225 Difference]: With dead ends: 108 [2019-01-31 16:55:27,748 INFO L226 Difference]: Without dead ends: 107 [2019-01-31 16:55:27,749 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4556 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=4795, Invalid=5917, Unknown=0, NotChecked=0, Total=10712 [2019-01-31 16:55:27,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2019-01-31 16:55:27,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2019-01-31 16:55:27,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2019-01-31 16:55:27,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 106 transitions. [2019-01-31 16:55:27,754 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 106 transitions. Word has length 102 [2019-01-31 16:55:27,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:55:27,754 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 106 transitions. [2019-01-31 16:55:27,754 INFO L481 AbstractCegarLoop]: Interpolant automaton has 70 states. [2019-01-31 16:55:27,754 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 106 transitions. [2019-01-31 16:55:27,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2019-01-31 16:55:27,755 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:55:27,755 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1] [2019-01-31 16:55:27,755 INFO L423 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:55:27,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:55:27,756 INFO L82 PathProgramCache]: Analyzing trace with hash 1701340576, now seen corresponding path program 34 times [2019-01-31 16:55:27,756 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:55:27,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:27,756 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:55:27,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:27,757 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:55:27,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:28,528 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:28,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:28,528 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:55:28,529 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:55:28,529 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:55:28,529 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:28,529 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 [2019-01-31 16:55:28,537 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:55:28,537 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:55:28,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:28,572 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:55:28,588 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 [2019-01-31 16:55:28,589 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:55:28,600 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:55:28,600 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:55:29,730 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:29,730 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:55:31,238 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:31,256 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:55:31,257 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 105 [2019-01-31 16:55:31,257 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:55:31,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 72 states [2019-01-31 16:55:31,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2019-01-31 16:55:31,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5076, Invalid=6266, Unknown=0, NotChecked=0, Total=11342 [2019-01-31 16:55:31,258 INFO L87 Difference]: Start difference. First operand 106 states and 106 transitions. Second operand 72 states. [2019-01-31 16:55:31,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:55:31,456 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2019-01-31 16:55:31,457 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2019-01-31 16:55:31,457 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 105 [2019-01-31 16:55:31,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:55:31,458 INFO L225 Difference]: With dead ends: 111 [2019-01-31 16:55:31,458 INFO L226 Difference]: Without dead ends: 110 [2019-01-31 16:55:31,459 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4830 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=5076, Invalid=6266, Unknown=0, NotChecked=0, Total=11342 [2019-01-31 16:55:31,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2019-01-31 16:55:31,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2019-01-31 16:55:31,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2019-01-31 16:55:31,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2019-01-31 16:55:31,463 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 105 [2019-01-31 16:55:31,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:55:31,463 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2019-01-31 16:55:31,464 INFO L481 AbstractCegarLoop]: Interpolant automaton has 72 states. [2019-01-31 16:55:31,464 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2019-01-31 16:55:31,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2019-01-31 16:55:31,464 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:55:31,465 INFO L402 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1] [2019-01-31 16:55:31,465 INFO L423 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:55:31,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:55:31,465 INFO L82 PathProgramCache]: Analyzing trace with hash -271918964, now seen corresponding path program 35 times [2019-01-31 16:55:31,465 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:55:31,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:31,466 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:55:31,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:31,466 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:55:31,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:32,218 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:32,218 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:32,218 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:55:32,218 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:55:32,218 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:55:32,218 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:32,218 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 [2019-01-31 16:55:32,227 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:55:32,227 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:55:32,319 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2019-01-31 16:55:32,319 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:55:32,323 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:55:32,326 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 [2019-01-31 16:55:32,326 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:55:32,338 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:55:32,338 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:55:33,123 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:33,123 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:55:35,073 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:35,091 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:55:35,091 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 108 [2019-01-31 16:55:35,091 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:55:35,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2019-01-31 16:55:35,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2019-01-31 16:55:35,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5365, Invalid=6625, Unknown=0, NotChecked=0, Total=11990 [2019-01-31 16:55:35,093 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 74 states. [2019-01-31 16:55:35,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:55:35,484 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2019-01-31 16:55:35,484 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-01-31 16:55:35,484 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 108 [2019-01-31 16:55:35,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:55:35,485 INFO L225 Difference]: With dead ends: 114 [2019-01-31 16:55:35,485 INFO L226 Difference]: Without dead ends: 113 [2019-01-31 16:55:35,486 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5112 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=5365, Invalid=6625, Unknown=0, NotChecked=0, Total=11990 [2019-01-31 16:55:35,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2019-01-31 16:55:35,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 112. [2019-01-31 16:55:35,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2019-01-31 16:55:35,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 112 transitions. [2019-01-31 16:55:35,490 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 112 transitions. Word has length 108 [2019-01-31 16:55:35,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:55:35,491 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 112 transitions. [2019-01-31 16:55:35,491 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2019-01-31 16:55:35,491 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 112 transitions. [2019-01-31 16:55:35,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2019-01-31 16:55:35,492 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:55:35,492 INFO L402 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1] [2019-01-31 16:55:35,492 INFO L423 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:55:35,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:55:35,492 INFO L82 PathProgramCache]: Analyzing trace with hash -429494752, now seen corresponding path program 36 times [2019-01-31 16:55:35,492 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:55:35,493 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:35,493 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:55:35,493 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:35,493 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:55:35,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:36,608 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:36,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:36,608 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:55:36,609 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:55:36,609 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:55:36,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:36,609 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 [2019-01-31 16:55:36,619 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:55:36,619 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:55:36,655 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:55:36,655 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:55:36,659 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:55:36,678 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 [2019-01-31 16:55:36,679 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:55:36,688 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:55:36,689 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:55:37,663 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:37,663 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:55:39,650 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:39,668 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:55:39,668 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 111 [2019-01-31 16:55:39,668 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:55:39,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 76 states [2019-01-31 16:55:39,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2019-01-31 16:55:39,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5662, Invalid=6994, Unknown=0, NotChecked=0, Total=12656 [2019-01-31 16:55:39,670 INFO L87 Difference]: Start difference. First operand 112 states and 112 transitions. Second operand 76 states. [2019-01-31 16:55:39,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:55:39,902 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2019-01-31 16:55:39,903 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-01-31 16:55:39,903 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 111 [2019-01-31 16:55:39,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:55:39,904 INFO L225 Difference]: With dead ends: 117 [2019-01-31 16:55:39,904 INFO L226 Difference]: Without dead ends: 116 [2019-01-31 16:55:39,905 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5402 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=5662, Invalid=6994, Unknown=0, NotChecked=0, Total=12656 [2019-01-31 16:55:39,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2019-01-31 16:55:39,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2019-01-31 16:55:39,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2019-01-31 16:55:39,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2019-01-31 16:55:39,909 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 111 [2019-01-31 16:55:39,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:55:39,910 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2019-01-31 16:55:39,910 INFO L481 AbstractCegarLoop]: Interpolant automaton has 76 states. [2019-01-31 16:55:39,910 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2019-01-31 16:55:39,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2019-01-31 16:55:39,911 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:55:39,911 INFO L402 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1] [2019-01-31 16:55:39,911 INFO L423 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:55:39,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:55:39,911 INFO L82 PathProgramCache]: Analyzing trace with hash -370540532, now seen corresponding path program 37 times [2019-01-31 16:55:39,911 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:55:39,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:39,912 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:55:39,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:39,912 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:55:39,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:40,685 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:40,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:40,685 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:55:40,685 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:55:40,686 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:55:40,686 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:40,686 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 [2019-01-31 16:55:40,694 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:55:40,695 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:55:40,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:40,741 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:55:40,762 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 [2019-01-31 16:55:40,763 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:55:40,801 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:55:40,802 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:55:41,687 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:41,687 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:55:43,471 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:43,489 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:55:43,489 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 114 [2019-01-31 16:55:43,489 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:55:43,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 78 states [2019-01-31 16:55:43,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2019-01-31 16:55:43,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5967, Invalid=7373, Unknown=0, NotChecked=0, Total=13340 [2019-01-31 16:55:43,491 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 78 states. [2019-01-31 16:55:43,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:55:43,793 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2019-01-31 16:55:43,794 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2019-01-31 16:55:43,794 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 114 [2019-01-31 16:55:43,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:55:43,795 INFO L225 Difference]: With dead ends: 120 [2019-01-31 16:55:43,795 INFO L226 Difference]: Without dead ends: 119 [2019-01-31 16:55:43,796 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5700 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=5967, Invalid=7373, Unknown=0, NotChecked=0, Total=13340 [2019-01-31 16:55:43,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2019-01-31 16:55:43,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2019-01-31 16:55:43,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2019-01-31 16:55:43,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 118 transitions. [2019-01-31 16:55:43,800 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 118 transitions. Word has length 114 [2019-01-31 16:55:43,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:55:43,800 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 118 transitions. [2019-01-31 16:55:43,800 INFO L481 AbstractCegarLoop]: Interpolant automaton has 78 states. [2019-01-31 16:55:43,800 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 118 transitions. [2019-01-31 16:55:43,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2019-01-31 16:55:43,801 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:55:43,801 INFO L402 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1] [2019-01-31 16:55:43,801 INFO L423 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:55:43,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:55:43,802 INFO L82 PathProgramCache]: Analyzing trace with hash -706996576, now seen corresponding path program 38 times [2019-01-31 16:55:43,802 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:55:43,802 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:43,802 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:55:43,802 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:43,802 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:55:43,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:45,191 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:45,191 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:45,191 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:55:45,192 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:55:45,192 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:55:45,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:45,192 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 [2019-01-31 16:55:45,200 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:55:45,200 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:55:45,302 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2019-01-31 16:55:45,302 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:55:45,306 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:55:45,308 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 [2019-01-31 16:55:45,309 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:55:45,321 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:55:45,321 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:55:46,515 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:46,515 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:55:48,518 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:48,546 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:55:48,546 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 117 [2019-01-31 16:55:48,546 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:55:48,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2019-01-31 16:55:48,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2019-01-31 16:55:48,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6280, Invalid=7762, Unknown=0, NotChecked=0, Total=14042 [2019-01-31 16:55:48,548 INFO L87 Difference]: Start difference. First operand 118 states and 118 transitions. Second operand 80 states. [2019-01-31 16:55:48,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:55:48,901 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2019-01-31 16:55:48,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2019-01-31 16:55:48,902 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 117 [2019-01-31 16:55:48,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:55:48,903 INFO L225 Difference]: With dead ends: 123 [2019-01-31 16:55:48,903 INFO L226 Difference]: Without dead ends: 122 [2019-01-31 16:55:48,904 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6006 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=6280, Invalid=7762, Unknown=0, NotChecked=0, Total=14042 [2019-01-31 16:55:48,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2019-01-31 16:55:48,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2019-01-31 16:55:48,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2019-01-31 16:55:48,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2019-01-31 16:55:48,907 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 117 [2019-01-31 16:55:48,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:55:48,908 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2019-01-31 16:55:48,908 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2019-01-31 16:55:48,908 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2019-01-31 16:55:48,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2019-01-31 16:55:48,908 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:55:48,908 INFO L402 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1] [2019-01-31 16:55:48,909 INFO L423 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:55:48,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:55:48,909 INFO L82 PathProgramCache]: Analyzing trace with hash 384665484, now seen corresponding path program 39 times [2019-01-31 16:55:48,909 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:55:48,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:48,910 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:55:48,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:48,910 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:55:48,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:50,112 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:50,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:50,112 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:55:50,112 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:55:50,112 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:55:50,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:50,113 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 [2019-01-31 16:55:50,121 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:55:50,121 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:55:50,162 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:55:50,162 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:55:50,167 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:55:50,183 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 [2019-01-31 16:55:50,184 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:55:50,267 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:55:50,268 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:55:51,728 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:51,728 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:55:53,694 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:53,722 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:55:53,722 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 120 [2019-01-31 16:55:53,722 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:55:53,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 82 states [2019-01-31 16:55:53,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2019-01-31 16:55:53,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6601, Invalid=8161, Unknown=0, NotChecked=0, Total=14762 [2019-01-31 16:55:53,725 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand 82 states. [2019-01-31 16:55:54,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:55:54,034 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2019-01-31 16:55:54,034 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-01-31 16:55:54,034 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 120 [2019-01-31 16:55:54,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:55:54,035 INFO L225 Difference]: With dead ends: 126 [2019-01-31 16:55:54,036 INFO L226 Difference]: Without dead ends: 125 [2019-01-31 16:55:54,036 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6320 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=6601, Invalid=8161, Unknown=0, NotChecked=0, Total=14762 [2019-01-31 16:55:54,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2019-01-31 16:55:54,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2019-01-31 16:55:54,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2019-01-31 16:55:54,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 124 transitions. [2019-01-31 16:55:54,040 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 124 transitions. Word has length 120 [2019-01-31 16:55:54,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:55:54,040 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 124 transitions. [2019-01-31 16:55:54,040 INFO L481 AbstractCegarLoop]: Interpolant automaton has 82 states. [2019-01-31 16:55:54,040 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 124 transitions. [2019-01-31 16:55:54,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2019-01-31 16:55:54,041 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:55:54,041 INFO L402 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1] [2019-01-31 16:55:54,041 INFO L423 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:55:54,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:55:54,041 INFO L82 PathProgramCache]: Analyzing trace with hash 596729632, now seen corresponding path program 40 times [2019-01-31 16:55:54,041 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:55:54,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:54,042 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:55:54,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:54,042 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:55:54,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:55,624 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:55,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:55,625 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:55:55,625 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:55:55,625 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:55:55,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:55:55,625 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 [2019-01-31 16:55:55,633 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:55:55,633 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:55:55,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:55:55,683 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:55:55,685 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 [2019-01-31 16:55:55,685 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:55:55,693 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:55:55,693 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:55:56,702 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:56,702 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:55:58,777 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:55:58,806 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:55:58,806 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 123 [2019-01-31 16:55:58,806 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:55:58,807 INFO L459 AbstractCegarLoop]: Interpolant automaton has 84 states [2019-01-31 16:55:58,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2019-01-31 16:55:58,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6930, Invalid=8570, Unknown=0, NotChecked=0, Total=15500 [2019-01-31 16:55:58,809 INFO L87 Difference]: Start difference. First operand 124 states and 124 transitions. Second operand 84 states. [2019-01-31 16:55:59,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:55:59,202 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2019-01-31 16:55:59,202 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2019-01-31 16:55:59,203 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 123 [2019-01-31 16:55:59,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:55:59,204 INFO L225 Difference]: With dead ends: 129 [2019-01-31 16:55:59,204 INFO L226 Difference]: Without dead ends: 128 [2019-01-31 16:55:59,206 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 [2019-01-31 16:55:59,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2019-01-31 16:55:59,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2019-01-31 16:55:59,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2019-01-31 16:55:59,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2019-01-31 16:55:59,210 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 123 [2019-01-31 16:55:59,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:55:59,211 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2019-01-31 16:55:59,211 INFO L481 AbstractCegarLoop]: Interpolant automaton has 84 states. [2019-01-31 16:55:59,211 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2019-01-31 16:55:59,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2019-01-31 16:55:59,211 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:55:59,212 INFO L402 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1] [2019-01-31 16:55:59,212 INFO L423 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:55:59,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:55:59,212 INFO L82 PathProgramCache]: Analyzing trace with hash 302870284, now seen corresponding path program 41 times [2019-01-31 16:55:59,212 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:55:59,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:59,213 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:55:59,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:55:59,213 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:55:59,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:56:00,413 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:00,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:00,413 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:56:00,413 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:56:00,413 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:56:00,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:00,413 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 [2019-01-31 16:56:00,426 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:56:00,426 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:56:00,548 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2019-01-31 16:56:00,548 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:56:00,554 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:56:00,565 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 [2019-01-31 16:56:00,565 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:56:00,575 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:56:00,575 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:56:01,679 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:01,679 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:56:03,848 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:03,866 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:56:03,866 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 126 [2019-01-31 16:56:03,866 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:56:03,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2019-01-31 16:56:03,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2019-01-31 16:56:03,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7267, Invalid=8989, Unknown=0, NotChecked=0, Total=16256 [2019-01-31 16:56:03,868 INFO L87 Difference]: Start difference. First operand 127 states and 127 transitions. Second operand 86 states. [2019-01-31 16:56:04,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:56:04,738 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2019-01-31 16:56:04,738 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-01-31 16:56:04,738 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 126 [2019-01-31 16:56:04,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:56:04,740 INFO L225 Difference]: With dead ends: 132 [2019-01-31 16:56:04,740 INFO L226 Difference]: Without dead ends: 131 [2019-01-31 16:56:04,741 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6972 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=7267, Invalid=8989, Unknown=0, NotChecked=0, Total=16256 [2019-01-31 16:56:04,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2019-01-31 16:56:04,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 130. [2019-01-31 16:56:04,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2019-01-31 16:56:04,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 130 transitions. [2019-01-31 16:56:04,745 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 130 transitions. Word has length 126 [2019-01-31 16:56:04,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:56:04,746 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 130 transitions. [2019-01-31 16:56:04,746 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2019-01-31 16:56:04,746 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 130 transitions. [2019-01-31 16:56:04,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2019-01-31 16:56:04,746 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:56:04,747 INFO L402 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1] [2019-01-31 16:56:04,747 INFO L423 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:56:04,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:56:04,747 INFO L82 PathProgramCache]: Analyzing trace with hash -917616736, now seen corresponding path program 42 times [2019-01-31 16:56:04,747 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:56:04,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:56:04,748 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:56:04,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:56:04,748 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:56:04,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:56:05,876 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:05,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:05,877 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:56:05,877 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:56:05,877 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:56:05,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:05,877 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 [2019-01-31 16:56:05,885 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:56:05,885 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:56:05,928 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:56:05,928 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:56:05,933 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:56:05,936 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 [2019-01-31 16:56:05,936 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:56:05,951 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:56:05,952 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:56:07,076 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:07,076 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:56:09,311 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:09,329 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:56:09,329 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 129 [2019-01-31 16:56:09,329 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:56:09,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 88 states [2019-01-31 16:56:09,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2019-01-31 16:56:09,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7612, Invalid=9418, Unknown=0, NotChecked=0, Total=17030 [2019-01-31 16:56:09,331 INFO L87 Difference]: Start difference. First operand 130 states and 130 transitions. Second operand 88 states. [2019-01-31 16:56:09,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:56:09,832 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2019-01-31 16:56:09,833 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2019-01-31 16:56:09,833 INFO L78 Accepts]: Start accepts. Automaton has 88 states. Word has length 129 [2019-01-31 16:56:09,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:56:09,834 INFO L225 Difference]: With dead ends: 135 [2019-01-31 16:56:09,834 INFO L226 Difference]: Without dead ends: 134 [2019-01-31 16:56:09,834 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 [2019-01-31 16:56:09,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2019-01-31 16:56:09,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2019-01-31 16:56:09,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2019-01-31 16:56:09,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 133 transitions. [2019-01-31 16:56:09,840 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 133 transitions. Word has length 129 [2019-01-31 16:56:09,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:56:09,840 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 133 transitions. [2019-01-31 16:56:09,840 INFO L481 AbstractCegarLoop]: Interpolant automaton has 88 states. [2019-01-31 16:56:09,841 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 133 transitions. [2019-01-31 16:56:09,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2019-01-31 16:56:09,841 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:56:09,841 INFO L402 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1] [2019-01-31 16:56:09,842 INFO L423 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:56:09,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:56:09,842 INFO L82 PathProgramCache]: Analyzing trace with hash 746698380, now seen corresponding path program 43 times [2019-01-31 16:56:09,842 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:56:09,843 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:56:09,843 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:56:09,843 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:56:09,843 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:56:09,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:56:11,120 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:11,121 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:11,121 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:56:11,121 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:56:11,121 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:56:11,121 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:11,121 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 [2019-01-31 16:56:11,130 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:56:11,130 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:56:11,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:56:11,173 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:56:11,177 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 [2019-01-31 16:56:11,177 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:56:11,187 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:56:11,187 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:56:12,370 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:12,370 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:56:14,685 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:14,704 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:56:14,704 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 132 [2019-01-31 16:56:14,704 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:56:14,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 90 states [2019-01-31 16:56:14,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2019-01-31 16:56:14,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7965, Invalid=9857, Unknown=0, NotChecked=0, Total=17822 [2019-01-31 16:56:14,706 INFO L87 Difference]: Start difference. First operand 133 states and 133 transitions. Second operand 90 states. [2019-01-31 16:56:14,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:56:14,972 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2019-01-31 16:56:14,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-01-31 16:56:14,972 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 132 [2019-01-31 16:56:14,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:56:14,973 INFO L225 Difference]: With dead ends: 138 [2019-01-31 16:56:14,974 INFO L226 Difference]: Without dead ends: 137 [2019-01-31 16:56:14,975 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7656 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=7965, Invalid=9857, Unknown=0, NotChecked=0, Total=17822 [2019-01-31 16:56:14,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2019-01-31 16:56:14,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2019-01-31 16:56:14,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2019-01-31 16:56:14,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 136 transitions. [2019-01-31 16:56:14,979 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 136 transitions. Word has length 132 [2019-01-31 16:56:14,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:56:14,979 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 136 transitions. [2019-01-31 16:56:14,979 INFO L481 AbstractCegarLoop]: Interpolant automaton has 90 states. [2019-01-31 16:56:14,979 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 136 transitions. [2019-01-31 16:56:14,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2019-01-31 16:56:14,980 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:56:14,980 INFO L402 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1] [2019-01-31 16:56:14,980 INFO L423 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:56:14,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:56:14,980 INFO L82 PathProgramCache]: Analyzing trace with hash 1255854112, now seen corresponding path program 44 times [2019-01-31 16:56:14,980 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:56:14,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:56:14,981 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:56:14,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:56:14,981 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:56:14,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:56:16,642 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:16,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:16,642 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:56:16,642 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:56:16,642 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:56:16,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:16,642 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 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 [2019-01-31 16:56:16,651 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:56:16,652 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:56:16,774 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2019-01-31 16:56:16,774 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:56:16,778 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:56:16,781 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 [2019-01-31 16:56:16,782 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:56:16,792 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:56:16,792 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:56:18,052 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:18,052 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:56:20,805 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:20,824 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:56:20,824 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 135 [2019-01-31 16:56:20,824 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:56:20,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2019-01-31 16:56:20,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2019-01-31 16:56:20,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8326, Invalid=10306, Unknown=0, NotChecked=0, Total=18632 [2019-01-31 16:56:20,826 INFO L87 Difference]: Start difference. First operand 136 states and 136 transitions. Second operand 92 states. [2019-01-31 16:56:21,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:56:21,098 INFO L93 Difference]: Finished difference Result 141 states and 141 transitions. [2019-01-31 16:56:21,099 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-01-31 16:56:21,099 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 135 [2019-01-31 16:56:21,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:56:21,100 INFO L225 Difference]: With dead ends: 141 [2019-01-31 16:56:21,100 INFO L226 Difference]: Without dead ends: 140 [2019-01-31 16:56:21,101 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8010 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=8326, Invalid=10306, Unknown=0, NotChecked=0, Total=18632 [2019-01-31 16:56:21,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2019-01-31 16:56:21,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2019-01-31 16:56:21,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2019-01-31 16:56:21,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 139 transitions. [2019-01-31 16:56:21,107 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 139 transitions. Word has length 135 [2019-01-31 16:56:21,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:56:21,107 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 139 transitions. [2019-01-31 16:56:21,107 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2019-01-31 16:56:21,107 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 139 transitions. [2019-01-31 16:56:21,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2019-01-31 16:56:21,108 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:56:21,108 INFO L402 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1] [2019-01-31 16:56:21,108 INFO L423 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:56:21,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:56:21,108 INFO L82 PathProgramCache]: Analyzing trace with hash -310223348, now seen corresponding path program 45 times [2019-01-31 16:56:21,109 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:56:21,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:56:21,109 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:56:21,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:56:21,110 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:56:21,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:56:22,292 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:22,292 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:22,292 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:56:22,292 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:56:22,292 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:56:22,292 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:22,293 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 [2019-01-31 16:56:22,303 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:56:22,304 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:56:22,355 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:56:22,355 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:56:22,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:56:22,378 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 [2019-01-31 16:56:22,379 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:56:22,434 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:56:22,435 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:56:23,675 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:23,675 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:56:26,449 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:26,468 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:56:26,469 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 138 [2019-01-31 16:56:26,469 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:56:26,469 INFO L459 AbstractCegarLoop]: Interpolant automaton has 94 states [2019-01-31 16:56:26,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2019-01-31 16:56:26,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8695, Invalid=10765, Unknown=0, NotChecked=0, Total=19460 [2019-01-31 16:56:26,471 INFO L87 Difference]: Start difference. First operand 139 states and 139 transitions. Second operand 94 states. [2019-01-31 16:56:26,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:56:26,775 INFO L93 Difference]: Finished difference Result 144 states and 144 transitions. [2019-01-31 16:56:26,776 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2019-01-31 16:56:26,776 INFO L78 Accepts]: Start accepts. Automaton has 94 states. Word has length 138 [2019-01-31 16:56:26,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:56:26,777 INFO L225 Difference]: With dead ends: 144 [2019-01-31 16:56:26,778 INFO L226 Difference]: Without dead ends: 143 [2019-01-31 16:56:26,779 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8372 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=8695, Invalid=10765, Unknown=0, NotChecked=0, Total=19460 [2019-01-31 16:56:26,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2019-01-31 16:56:26,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 142. [2019-01-31 16:56:26,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2019-01-31 16:56:26,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 142 transitions. [2019-01-31 16:56:26,783 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 142 transitions. Word has length 138 [2019-01-31 16:56:26,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:56:26,784 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 142 transitions. [2019-01-31 16:56:26,784 INFO L481 AbstractCegarLoop]: Interpolant automaton has 94 states. [2019-01-31 16:56:26,784 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 142 transitions. [2019-01-31 16:56:26,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2019-01-31 16:56:26,785 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:56:26,785 INFO L402 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1] [2019-01-31 16:56:26,785 INFO L423 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:56:26,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:56:26,785 INFO L82 PathProgramCache]: Analyzing trace with hash 905902240, now seen corresponding path program 46 times [2019-01-31 16:56:26,785 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:56:26,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:56:26,786 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:56:26,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:56:26,786 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:56:26,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:56:28,423 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:28,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:28,423 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:56:28,423 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:56:28,423 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:56:28,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:28,423 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 [2019-01-31 16:56:28,433 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:56:28,433 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:56:28,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:56:28,478 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:56:28,481 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 [2019-01-31 16:56:28,481 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:56:28,489 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:56:28,490 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:56:29,794 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:29,795 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:56:33,038 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:33,057 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:56:33,057 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 141 [2019-01-31 16:56:33,057 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:56:33,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2019-01-31 16:56:33,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2019-01-31 16:56:33,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9072, Invalid=11234, Unknown=0, NotChecked=0, Total=20306 [2019-01-31 16:56:33,059 INFO L87 Difference]: Start difference. First operand 142 states and 142 transitions. Second operand 96 states. [2019-01-31 16:56:33,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:56:33,407 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2019-01-31 16:56:33,408 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2019-01-31 16:56:33,408 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 141 [2019-01-31 16:56:33,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:56:33,409 INFO L225 Difference]: With dead ends: 147 [2019-01-31 16:56:33,409 INFO L226 Difference]: Without dead ends: 146 [2019-01-31 16:56:33,410 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8742 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=9072, Invalid=11234, Unknown=0, NotChecked=0, Total=20306 [2019-01-31 16:56:33,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2019-01-31 16:56:33,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2019-01-31 16:56:33,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2019-01-31 16:56:33,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 145 transitions. [2019-01-31 16:56:33,414 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 145 transitions. Word has length 141 [2019-01-31 16:56:33,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:56:33,415 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 145 transitions. [2019-01-31 16:56:33,415 INFO L481 AbstractCegarLoop]: Interpolant automaton has 96 states. [2019-01-31 16:56:33,415 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 145 transitions. [2019-01-31 16:56:33,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2019-01-31 16:56:33,415 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:56:33,416 INFO L402 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1] [2019-01-31 16:56:33,416 INFO L423 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:56:33,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:56:33,416 INFO L82 PathProgramCache]: Analyzing trace with hash -1840814708, now seen corresponding path program 47 times [2019-01-31 16:56:33,416 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:56:33,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:56:33,417 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:56:33,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:56:33,417 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:56:33,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:56:34,597 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:34,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:34,598 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:56:34,598 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:56:34,598 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:56:34,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:34,598 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 [2019-01-31 16:56:34,605 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:56:34,606 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:56:34,745 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2019-01-31 16:56:34,745 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:56:34,754 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:56:34,769 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 [2019-01-31 16:56:34,769 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:56:34,856 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:56:34,856 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:56:36,512 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:36,512 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:56:39,294 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:39,312 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:56:39,312 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 144 [2019-01-31 16:56:39,312 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:56:39,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2019-01-31 16:56:39,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2019-01-31 16:56:39,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9457, Invalid=11713, Unknown=0, NotChecked=0, Total=21170 [2019-01-31 16:56:39,314 INFO L87 Difference]: Start difference. First operand 145 states and 145 transitions. Second operand 98 states. [2019-01-31 16:56:39,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:56:39,657 INFO L93 Difference]: Finished difference Result 150 states and 150 transitions. [2019-01-31 16:56:39,658 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2019-01-31 16:56:39,658 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 144 [2019-01-31 16:56:39,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:56:39,659 INFO L225 Difference]: With dead ends: 150 [2019-01-31 16:56:39,659 INFO L226 Difference]: Without dead ends: 149 [2019-01-31 16:56:39,661 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9120 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=9457, Invalid=11713, Unknown=0, NotChecked=0, Total=21170 [2019-01-31 16:56:39,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2019-01-31 16:56:39,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 148. [2019-01-31 16:56:39,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2019-01-31 16:56:39,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 148 transitions. [2019-01-31 16:56:39,666 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 148 transitions. Word has length 144 [2019-01-31 16:56:39,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:56:39,666 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 148 transitions. [2019-01-31 16:56:39,666 INFO L481 AbstractCegarLoop]: Interpolant automaton has 98 states. [2019-01-31 16:56:39,666 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 148 transitions. [2019-01-31 16:56:39,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2019-01-31 16:56:39,667 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:56:39,667 INFO L402 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1] [2019-01-31 16:56:39,668 INFO L423 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:56:39,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:56:39,668 INFO L82 PathProgramCache]: Analyzing trace with hash -1568489184, now seen corresponding path program 48 times [2019-01-31 16:56:39,668 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:56:39,669 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:56:39,669 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:56:39,669 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:56:39,669 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:56:39,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:56:41,141 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:41,141 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:41,141 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:56:41,142 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:56:41,142 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:56:41,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:41,142 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 [2019-01-31 16:56:41,150 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:56:41,150 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:56:41,205 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:56:41,205 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:56:41,209 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:56:41,212 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 [2019-01-31 16:56:41,212 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:56:41,223 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:56:41,223 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:56:42,638 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:42,638 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:56:45,572 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:45,590 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:56:45,591 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 147 [2019-01-31 16:56:45,591 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:56:45,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 100 states [2019-01-31 16:56:45,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2019-01-31 16:56:45,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9850, Invalid=12202, Unknown=0, NotChecked=0, Total=22052 [2019-01-31 16:56:45,592 INFO L87 Difference]: Start difference. First operand 148 states and 148 transitions. Second operand 100 states. [2019-01-31 16:56:46,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:56:46,083 INFO L93 Difference]: Finished difference Result 153 states and 153 transitions. [2019-01-31 16:56:46,083 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2019-01-31 16:56:46,084 INFO L78 Accepts]: Start accepts. Automaton has 100 states. Word has length 147 [2019-01-31 16:56:46,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:56:46,084 INFO L225 Difference]: With dead ends: 153 [2019-01-31 16:56:46,084 INFO L226 Difference]: Without dead ends: 152 [2019-01-31 16:56:46,085 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9506 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=9850, Invalid=12202, Unknown=0, NotChecked=0, Total=22052 [2019-01-31 16:56:46,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2019-01-31 16:56:46,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 151. [2019-01-31 16:56:46,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2019-01-31 16:56:46,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 151 transitions. [2019-01-31 16:56:46,091 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 151 transitions. Word has length 147 [2019-01-31 16:56:46,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:56:46,092 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 151 transitions. [2019-01-31 16:56:46,092 INFO L481 AbstractCegarLoop]: Interpolant automaton has 100 states. [2019-01-31 16:56:46,092 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 151 transitions. [2019-01-31 16:56:46,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2019-01-31 16:56:46,093 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:56:46,093 INFO L402 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1] [2019-01-31 16:56:46,093 INFO L423 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:56:46,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:56:46,093 INFO L82 PathProgramCache]: Analyzing trace with hash -1912025844, now seen corresponding path program 49 times [2019-01-31 16:56:46,094 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:56:46,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:56:46,094 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:56:46,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:56:46,094 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:56:46,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:56:47,545 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:47,545 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:47,545 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:56:47,545 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:56:47,545 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:56:47,545 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:47,545 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 [2019-01-31 16:56:47,554 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:56:47,554 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:56:47,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:56:47,608 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:56:47,627 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 [2019-01-31 16:56:47,628 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:56:47,703 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:56:47,703 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:56:49,497 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:49,497 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:56:52,868 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:52,887 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:56:52,887 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 150 [2019-01-31 16:56:52,887 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:56:52,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2019-01-31 16:56:52,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2019-01-31 16:56:52,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10251, Invalid=12701, Unknown=0, NotChecked=0, Total=22952 [2019-01-31 16:56:52,889 INFO L87 Difference]: Start difference. First operand 151 states and 151 transitions. Second operand 102 states. [2019-01-31 16:56:53,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:56:53,240 INFO L93 Difference]: Finished difference Result 156 states and 156 transitions. [2019-01-31 16:56:53,240 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2019-01-31 16:56:53,240 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 150 [2019-01-31 16:56:53,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:56:53,241 INFO L225 Difference]: With dead ends: 156 [2019-01-31 16:56:53,241 INFO L226 Difference]: Without dead ends: 155 [2019-01-31 16:56:53,243 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9900 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=10251, Invalid=12701, Unknown=0, NotChecked=0, Total=22952 [2019-01-31 16:56:53,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2019-01-31 16:56:53,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2019-01-31 16:56:53,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2019-01-31 16:56:53,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 154 transitions. [2019-01-31 16:56:53,248 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 154 transitions. Word has length 150 [2019-01-31 16:56:53,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:56:53,248 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 154 transitions. [2019-01-31 16:56:53,248 INFO L481 AbstractCegarLoop]: Interpolant automaton has 102 states. [2019-01-31 16:56:53,249 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 154 transitions. [2019-01-31 16:56:53,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2019-01-31 16:56:53,249 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:56:53,250 INFO L402 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1] [2019-01-31 16:56:53,250 INFO L423 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:56:53,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:56:53,250 INFO L82 PathProgramCache]: Analyzing trace with hash -1305597536, now seen corresponding path program 50 times [2019-01-31 16:56:53,250 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:56:53,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:56:53,251 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:56:53,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:56:53,251 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:56:53,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:56:54,752 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:54,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:54,753 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:56:54,753 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:56:54,753 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:56:54,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:56:54,753 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 [2019-01-31 16:56:54,762 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:56:54,762 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:56:54,921 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2019-01-31 16:56:54,921 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:56:54,926 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:56:54,928 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 [2019-01-31 16:56:54,928 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:56:54,946 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:56:54,946 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:56:56,712 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:56,712 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:56:59,787 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:56:59,805 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:56:59,806 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 151 [2019-01-31 16:56:59,806 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:56:59,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2019-01-31 16:56:59,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2019-01-31 16:56:59,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10353, Invalid=12903, Unknown=0, NotChecked=0, Total=23256 [2019-01-31 16:56:59,808 INFO L87 Difference]: Start difference. First operand 154 states and 154 transitions. Second operand 104 states. [2019-01-31 16:57:00,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:57:00,155 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2019-01-31 16:57:00,155 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2019-01-31 16:57:00,155 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 153 [2019-01-31 16:57:00,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:57:00,157 INFO L225 Difference]: With dead ends: 159 [2019-01-31 16:57:00,157 INFO L226 Difference]: Without dead ends: 158 [2019-01-31 16:57:00,158 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 [2019-01-31 16:57:00,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2019-01-31 16:57:00,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 157. [2019-01-31 16:57:00,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2019-01-31 16:57:00,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 157 transitions. [2019-01-31 16:57:00,161 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 157 transitions. Word has length 153 [2019-01-31 16:57:00,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:57:00,161 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 157 transitions. [2019-01-31 16:57:00,161 INFO L481 AbstractCegarLoop]: Interpolant automaton has 104 states. [2019-01-31 16:57:00,161 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 157 transitions. [2019-01-31 16:57:00,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2019-01-31 16:57:00,162 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:57:00,162 INFO L402 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1] [2019-01-31 16:57:00,163 INFO L423 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:57:00,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:57:00,163 INFO L82 PathProgramCache]: Analyzing trace with hash 167679116, now seen corresponding path program 51 times [2019-01-31 16:57:00,163 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:57:00,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:57:00,164 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:57:00,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:57:00,164 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:57:00,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:57:01,867 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:01,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:57:01,868 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:57:01,868 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:57:01,868 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:57:01,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:57:01,868 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 [2019-01-31 16:57:01,878 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:57:01,878 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:57:01,943 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:57:01,943 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:57:01,949 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:57:01,967 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 [2019-01-31 16:57:01,968 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:57:02,063 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:57:02,064 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:57:04,907 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:04,907 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:57:08,345 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:08,363 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:57:08,363 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 152 [2019-01-31 16:57:08,363 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:57:08,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 106 states [2019-01-31 16:57:08,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2019-01-31 16:57:08,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10455, Invalid=13107, Unknown=0, NotChecked=0, Total=23562 [2019-01-31 16:57:08,365 INFO L87 Difference]: Start difference. First operand 157 states and 157 transitions. Second operand 106 states. [2019-01-31 16:57:08,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:57:08,731 INFO L93 Difference]: Finished difference Result 162 states and 162 transitions. [2019-01-31 16:57:08,731 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2019-01-31 16:57:08,731 INFO L78 Accepts]: Start accepts. Automaton has 106 states. Word has length 156 [2019-01-31 16:57:08,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:57:08,733 INFO L225 Difference]: With dead ends: 162 [2019-01-31 16:57:08,733 INFO L226 Difference]: Without dead ends: 161 [2019-01-31 16:57:08,734 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 [2019-01-31 16:57:08,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2019-01-31 16:57:08,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 160. [2019-01-31 16:57:08,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2019-01-31 16:57:08,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 160 transitions. [2019-01-31 16:57:08,740 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 160 transitions. Word has length 156 [2019-01-31 16:57:08,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:57:08,740 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 160 transitions. [2019-01-31 16:57:08,740 INFO L481 AbstractCegarLoop]: Interpolant automaton has 106 states. [2019-01-31 16:57:08,740 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 160 transitions. [2019-01-31 16:57:08,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2019-01-31 16:57:08,741 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:57:08,741 INFO L402 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1] [2019-01-31 16:57:08,741 INFO L423 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:57:08,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:57:08,742 INFO L82 PathProgramCache]: Analyzing trace with hash 281621024, now seen corresponding path program 52 times [2019-01-31 16:57:08,742 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:57:08,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:57:08,743 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:57:08,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:57:08,743 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:57:08,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:57:10,232 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:10,232 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:57:10,232 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:57:10,232 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:57:10,232 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:57:10,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:57:10,233 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 [2019-01-31 16:57:10,241 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:57:10,241 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:57:10,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:57:10,291 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:57:10,295 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 [2019-01-31 16:57:10,295 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:57:10,302 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:57:10,302 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:57:12,139 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:12,139 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:57:15,292 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:15,311 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:57:15,311 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 153 [2019-01-31 16:57:15,311 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:57:15,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 108 states [2019-01-31 16:57:15,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2019-01-31 16:57:15,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10557, Invalid=13313, Unknown=0, NotChecked=0, Total=23870 [2019-01-31 16:57:15,313 INFO L87 Difference]: Start difference. First operand 160 states and 160 transitions. Second operand 108 states. [2019-01-31 16:57:15,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:57:15,726 INFO L93 Difference]: Finished difference Result 165 states and 165 transitions. [2019-01-31 16:57:15,726 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2019-01-31 16:57:15,726 INFO L78 Accepts]: Start accepts. Automaton has 108 states. Word has length 159 [2019-01-31 16:57:15,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:57:15,727 INFO L225 Difference]: With dead ends: 165 [2019-01-31 16:57:15,727 INFO L226 Difference]: Without dead ends: 164 [2019-01-31 16:57:15,728 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 369 GetRequests, 210 SyntacticMatches, 6 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11391 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=10557, Invalid=13313, Unknown=0, NotChecked=0, Total=23870 [2019-01-31 16:57:15,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2019-01-31 16:57:15,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 163. [2019-01-31 16:57:15,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2019-01-31 16:57:15,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 163 transitions. [2019-01-31 16:57:15,731 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 163 transitions. Word has length 159 [2019-01-31 16:57:15,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:57:15,731 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 163 transitions. [2019-01-31 16:57:15,732 INFO L481 AbstractCegarLoop]: Interpolant automaton has 108 states. [2019-01-31 16:57:15,732 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 163 transitions. [2019-01-31 16:57:15,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2019-01-31 16:57:15,732 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:57:15,732 INFO L402 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1] [2019-01-31 16:57:15,732 INFO L423 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:57:15,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:57:15,733 INFO L82 PathProgramCache]: Analyzing trace with hash 1700838412, now seen corresponding path program 53 times [2019-01-31 16:57:15,733 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:57:15,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:57:15,733 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:57:15,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:57:15,733 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:57:15,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:57:17,419 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:17,420 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:57:17,420 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:57:17,420 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:57:17,420 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:57:17,420 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:57:17,420 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 [2019-01-31 16:57:17,428 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:57:17,429 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:57:17,606 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2019-01-31 16:57:17,606 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:57:17,613 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:57:17,652 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 [2019-01-31 16:57:17,653 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:57:17,746 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:57:17,746 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:57:20,057 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:20,057 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:57:23,702 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:23,721 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:57:23,721 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 154 [2019-01-31 16:57:23,721 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:57:23,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2019-01-31 16:57:23,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2019-01-31 16:57:23,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10659, Invalid=13521, Unknown=0, NotChecked=0, Total=24180 [2019-01-31 16:57:23,723 INFO L87 Difference]: Start difference. First operand 163 states and 163 transitions. Second operand 110 states. [2019-01-31 16:57:24,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:57:24,142 INFO L93 Difference]: Finished difference Result 168 states and 168 transitions. [2019-01-31 16:57:24,142 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2019-01-31 16:57:24,142 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 162 [2019-01-31 16:57:24,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:57:24,143 INFO L225 Difference]: With dead ends: 168 [2019-01-31 16:57:24,144 INFO L226 Difference]: Without dead ends: 167 [2019-01-31 16:57:24,145 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 214 SyntacticMatches, 8 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11888 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=10659, Invalid=13521, Unknown=0, NotChecked=0, Total=24180 [2019-01-31 16:57:24,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2019-01-31 16:57:24,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2019-01-31 16:57:24,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2019-01-31 16:57:24,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 166 transitions. [2019-01-31 16:57:24,149 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 166 transitions. Word has length 162 [2019-01-31 16:57:24,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:57:24,149 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 166 transitions. [2019-01-31 16:57:24,149 INFO L481 AbstractCegarLoop]: Interpolant automaton has 110 states. [2019-01-31 16:57:24,149 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 166 transitions. [2019-01-31 16:57:24,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2019-01-31 16:57:24,150 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:57:24,150 INFO L402 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1] [2019-01-31 16:57:24,150 INFO L423 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:57:24,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:57:24,150 INFO L82 PathProgramCache]: Analyzing trace with hash 1947982496, now seen corresponding path program 54 times [2019-01-31 16:57:24,150 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:57:24,151 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:57:24,151 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:57:24,151 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:57:24,151 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:57:24,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:57:25,741 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:25,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:57:25,741 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:57:25,741 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:57:25,741 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:57:25,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:57:25,741 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 [2019-01-31 16:57:25,750 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:57:25,750 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:57:25,805 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:57:25,805 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:57:25,811 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:57:25,832 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 [2019-01-31 16:57:25,833 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:57:25,926 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:57:25,926 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:57:27,929 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:27,930 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:57:31,186 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:31,204 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:57:31,205 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 155 [2019-01-31 16:57:31,205 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:57:31,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 112 states [2019-01-31 16:57:31,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2019-01-31 16:57:31,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10761, Invalid=13731, Unknown=0, NotChecked=0, Total=24492 [2019-01-31 16:57:31,207 INFO L87 Difference]: Start difference. First operand 166 states and 166 transitions. Second operand 112 states. [2019-01-31 16:57:31,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:57:31,584 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2019-01-31 16:57:31,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2019-01-31 16:57:31,585 INFO L78 Accepts]: Start accepts. Automaton has 112 states. Word has length 165 [2019-01-31 16:57:31,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:57:31,586 INFO L225 Difference]: With dead ends: 171 [2019-01-31 16:57:31,586 INFO L226 Difference]: Without dead ends: 170 [2019-01-31 16:57:31,586 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 218 SyntacticMatches, 10 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12385 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=10761, Invalid=13731, Unknown=0, NotChecked=0, Total=24492 [2019-01-31 16:57:31,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2019-01-31 16:57:31,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2019-01-31 16:57:31,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2019-01-31 16:57:31,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 169 transitions. [2019-01-31 16:57:31,592 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 169 transitions. Word has length 165 [2019-01-31 16:57:31,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:57:31,592 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 169 transitions. [2019-01-31 16:57:31,592 INFO L481 AbstractCegarLoop]: Interpolant automaton has 112 states. [2019-01-31 16:57:31,592 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 169 transitions. [2019-01-31 16:57:31,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2019-01-31 16:57:31,593 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:57:31,593 INFO L402 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1] [2019-01-31 16:57:31,593 INFO L423 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:57:31,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:57:31,594 INFO L82 PathProgramCache]: Analyzing trace with hash -1251523700, now seen corresponding path program 55 times [2019-01-31 16:57:31,594 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:57:31,594 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:57:31,594 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:57:31,595 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:57:31,595 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:57:31,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:57:33,329 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:33,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:57:33,330 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:57:33,330 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:57:33,330 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:57:33,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:57:33,330 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 [2019-01-31 16:57:33,339 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:57:33,339 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:57:33,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:57:33,391 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:57:33,393 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 [2019-01-31 16:57:33,393 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:57:33,403 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:57:33,403 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:57:35,208 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:35,209 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:57:38,763 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:38,781 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:57:38,781 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 156 [2019-01-31 16:57:38,782 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:57:38,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 114 states [2019-01-31 16:57:38,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2019-01-31 16:57:38,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10863, Invalid=13943, Unknown=0, NotChecked=0, Total=24806 [2019-01-31 16:57:38,783 INFO L87 Difference]: Start difference. First operand 169 states and 169 transitions. Second operand 114 states. [2019-01-31 16:57:39,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:57:39,150 INFO L93 Difference]: Finished difference Result 174 states and 174 transitions. [2019-01-31 16:57:39,151 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2019-01-31 16:57:39,151 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 168 [2019-01-31 16:57:39,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:57:39,152 INFO L225 Difference]: With dead ends: 174 [2019-01-31 16:57:39,152 INFO L226 Difference]: Without dead ends: 173 [2019-01-31 16:57:39,153 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 222 SyntacticMatches, 12 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12882 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=10863, Invalid=13943, Unknown=0, NotChecked=0, Total=24806 [2019-01-31 16:57:39,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2019-01-31 16:57:39,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 172. [2019-01-31 16:57:39,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2019-01-31 16:57:39,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 172 transitions. [2019-01-31 16:57:39,159 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 172 transitions. Word has length 168 [2019-01-31 16:57:39,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:57:39,159 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 172 transitions. [2019-01-31 16:57:39,159 INFO L481 AbstractCegarLoop]: Interpolant automaton has 114 states. [2019-01-31 16:57:39,159 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 172 transitions. [2019-01-31 16:57:39,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2019-01-31 16:57:39,160 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:57:39,160 INFO L402 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1] [2019-01-31 16:57:39,160 INFO L423 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:57:39,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:57:39,161 INFO L82 PathProgramCache]: Analyzing trace with hash 468591392, now seen corresponding path program 56 times [2019-01-31 16:57:39,161 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:57:39,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:57:39,161 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:57:39,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:57:39,162 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:57:39,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:57:40,667 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:40,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:57:40,668 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:57:40,668 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:57:40,668 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:57:40,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:57:40,668 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 [2019-01-31 16:57:40,677 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:57:40,678 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:57:40,869 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2019-01-31 16:57:40,869 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:57:40,874 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:57:40,877 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 [2019-01-31 16:57:40,877 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:57:40,884 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:57:40,884 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:57:42,996 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:42,996 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:57:46,362 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:46,380 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:57:46,380 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 157 [2019-01-31 16:57:46,381 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:57:46,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2019-01-31 16:57:46,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2019-01-31 16:57:46,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10965, Invalid=14157, Unknown=0, NotChecked=0, Total=25122 [2019-01-31 16:57:46,383 INFO L87 Difference]: Start difference. First operand 172 states and 172 transitions. Second operand 116 states. [2019-01-31 16:57:46,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:57:46,798 INFO L93 Difference]: Finished difference Result 177 states and 177 transitions. [2019-01-31 16:57:46,798 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2019-01-31 16:57:46,798 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 171 [2019-01-31 16:57:46,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:57:46,799 INFO L225 Difference]: With dead ends: 177 [2019-01-31 16:57:46,799 INFO L226 Difference]: Without dead ends: 176 [2019-01-31 16:57:46,800 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 226 SyntacticMatches, 14 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13379 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=10965, Invalid=14157, Unknown=0, NotChecked=0, Total=25122 [2019-01-31 16:57:46,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2019-01-31 16:57:46,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 175. [2019-01-31 16:57:46,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2019-01-31 16:57:46,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 175 transitions. [2019-01-31 16:57:46,804 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 175 transitions. Word has length 171 [2019-01-31 16:57:46,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:57:46,804 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 175 transitions. [2019-01-31 16:57:46,804 INFO L481 AbstractCegarLoop]: Interpolant automaton has 116 states. [2019-01-31 16:57:46,804 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 175 transitions. [2019-01-31 16:57:46,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2019-01-31 16:57:46,805 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:57:46,805 INFO L402 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1] [2019-01-31 16:57:46,805 INFO L423 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:57:46,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:57:46,806 INFO L82 PathProgramCache]: Analyzing trace with hash 1162488588, now seen corresponding path program 57 times [2019-01-31 16:57:46,806 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:57:46,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:57:46,807 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:57:46,807 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:57:46,807 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:57:46,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:57:48,622 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:48,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:57:48,622 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:57:48,622 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:57:48,622 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:57:48,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:57:48,623 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 [2019-01-31 16:57:48,632 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:57:48,632 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:57:48,704 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:57:48,704 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:57:48,710 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:57:48,712 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 [2019-01-31 16:57:48,712 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:57:48,722 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:57:48,722 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:57:50,726 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:50,727 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:57:54,256 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:54,274 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:57:54,275 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 158 [2019-01-31 16:57:54,275 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:57:54,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 118 states [2019-01-31 16:57:54,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2019-01-31 16:57:54,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11067, Invalid=14373, Unknown=0, NotChecked=0, Total=25440 [2019-01-31 16:57:54,277 INFO L87 Difference]: Start difference. First operand 175 states and 175 transitions. Second operand 118 states. [2019-01-31 16:57:54,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:57:54,700 INFO L93 Difference]: Finished difference Result 180 states and 180 transitions. [2019-01-31 16:57:54,701 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2019-01-31 16:57:54,701 INFO L78 Accepts]: Start accepts. Automaton has 118 states. Word has length 174 [2019-01-31 16:57:54,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:57:54,702 INFO L225 Difference]: With dead ends: 180 [2019-01-31 16:57:54,702 INFO L226 Difference]: Without dead ends: 179 [2019-01-31 16:57:54,702 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 230 SyntacticMatches, 16 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13876 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=11067, Invalid=14373, Unknown=0, NotChecked=0, Total=25440 [2019-01-31 16:57:54,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2019-01-31 16:57:54,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 178. [2019-01-31 16:57:54,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2019-01-31 16:57:54,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 178 transitions. [2019-01-31 16:57:54,708 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 178 transitions. Word has length 174 [2019-01-31 16:57:54,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:57:54,708 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 178 transitions. [2019-01-31 16:57:54,708 INFO L481 AbstractCegarLoop]: Interpolant automaton has 118 states. [2019-01-31 16:57:54,708 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 178 transitions. [2019-01-31 16:57:54,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2019-01-31 16:57:54,709 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:57:54,709 INFO L402 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1] [2019-01-31 16:57:54,710 INFO L423 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:57:54,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:57:54,710 INFO L82 PathProgramCache]: Analyzing trace with hash 1376258976, now seen corresponding path program 58 times [2019-01-31 16:57:54,710 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:57:54,710 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:57:54,711 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:57:54,711 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:57:54,711 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:57:54,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:57:56,440 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:56,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:57:56,441 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:57:56,441 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:57:56,441 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:57:56,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:57:56,441 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 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 [2019-01-31 16:57:56,451 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:57:56,451 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:57:56,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:57:56,506 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:57:56,508 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 [2019-01-31 16:57:56,508 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:57:56,518 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:57:56,518 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:57:58,784 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:57:58,784 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:58:02,139 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:02,157 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:58:02,157 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 159 [2019-01-31 16:58:02,157 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:58:02,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 120 states [2019-01-31 16:58:02,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2019-01-31 16:58:02,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11169, Invalid=14591, Unknown=0, NotChecked=0, Total=25760 [2019-01-31 16:58:02,159 INFO L87 Difference]: Start difference. First operand 178 states and 178 transitions. Second operand 120 states. [2019-01-31 16:58:02,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:58:02,612 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2019-01-31 16:58:02,613 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2019-01-31 16:58:02,613 INFO L78 Accepts]: Start accepts. Automaton has 120 states. Word has length 177 [2019-01-31 16:58:02,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:58:02,614 INFO L225 Difference]: With dead ends: 183 [2019-01-31 16:58:02,614 INFO L226 Difference]: Without dead ends: 182 [2019-01-31 16:58:02,615 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 234 SyntacticMatches, 18 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14373 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=11169, Invalid=14591, Unknown=0, NotChecked=0, Total=25760 [2019-01-31 16:58:02,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2019-01-31 16:58:02,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 181. [2019-01-31 16:58:02,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2019-01-31 16:58:02,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 181 transitions. [2019-01-31 16:58:02,620 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 181 transitions. Word has length 177 [2019-01-31 16:58:02,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:58:02,620 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 181 transitions. [2019-01-31 16:58:02,620 INFO L481 AbstractCegarLoop]: Interpolant automaton has 120 states. [2019-01-31 16:58:02,620 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 181 transitions. [2019-01-31 16:58:02,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2019-01-31 16:58:02,621 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:58:02,621 INFO L402 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1] [2019-01-31 16:58:02,622 INFO L423 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:58:02,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:58:02,622 INFO L82 PathProgramCache]: Analyzing trace with hash 373387916, now seen corresponding path program 59 times [2019-01-31 16:58:02,622 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:58:02,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:58:02,623 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:58:02,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:58:02,623 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:58:02,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:58:04,454 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:04,455 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:58:04,455 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:58:04,455 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:58:04,455 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:58:04,455 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:58:04,455 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 [2019-01-31 16:58:04,463 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:58:04,463 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:58:04,998 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2019-01-31 16:58:04,998 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:58:05,005 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:58:05,020 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 [2019-01-31 16:58:05,020 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:58:05,028 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:58:05,028 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:58:07,073 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:07,073 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:58:10,896 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:10,917 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:58:10,917 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 160 [2019-01-31 16:58:10,917 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:58:10,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2019-01-31 16:58:10,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2019-01-31 16:58:10,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11271, Invalid=14811, Unknown=0, NotChecked=0, Total=26082 [2019-01-31 16:58:10,919 INFO L87 Difference]: Start difference. First operand 181 states and 181 transitions. Second operand 122 states. [2019-01-31 16:58:11,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:58:11,317 INFO L93 Difference]: Finished difference Result 186 states and 186 transitions. [2019-01-31 16:58:11,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2019-01-31 16:58:11,317 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 180 [2019-01-31 16:58:11,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:58:11,319 INFO L225 Difference]: With dead ends: 186 [2019-01-31 16:58:11,319 INFO L226 Difference]: Without dead ends: 185 [2019-01-31 16:58:11,320 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 238 SyntacticMatches, 20 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14870 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=11271, Invalid=14811, Unknown=0, NotChecked=0, Total=26082 [2019-01-31 16:58:11,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2019-01-31 16:58:11,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2019-01-31 16:58:11,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2019-01-31 16:58:11,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 184 transitions. [2019-01-31 16:58:11,326 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 184 transitions. Word has length 180 [2019-01-31 16:58:11,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:58:11,326 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 184 transitions. [2019-01-31 16:58:11,326 INFO L481 AbstractCegarLoop]: Interpolant automaton has 122 states. [2019-01-31 16:58:11,326 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 184 transitions. [2019-01-31 16:58:11,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2019-01-31 16:58:11,327 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:58:11,327 INFO L402 BasicCegarLoop]: trace histogram [61, 60, 60, 1, 1] [2019-01-31 16:58:11,327 INFO L423 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:58:11,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:58:11,328 INFO L82 PathProgramCache]: Analyzing trace with hash -365849568, now seen corresponding path program 60 times [2019-01-31 16:58:11,328 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:58:11,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:58:11,329 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:58:11,329 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:58:11,329 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:58:11,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:58:13,267 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:13,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:58:13,268 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:58:13,268 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:58:13,268 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:58:13,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:58:13,268 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 [2019-01-31 16:58:13,277 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:58:13,277 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:58:13,335 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:58:13,335 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:58:13,342 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:58:13,358 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 [2019-01-31 16:58:13,359 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:58:13,400 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:58:13,400 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:58:15,534 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:15,535 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:58:19,210 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:19,229 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:58:19,229 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 161 [2019-01-31 16:58:19,229 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:58:19,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 124 states [2019-01-31 16:58:19,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2019-01-31 16:58:19,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11373, Invalid=15033, Unknown=0, NotChecked=0, Total=26406 [2019-01-31 16:58:19,231 INFO L87 Difference]: Start difference. First operand 184 states and 184 transitions. Second operand 124 states. [2019-01-31 16:58:19,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:58:19,679 INFO L93 Difference]: Finished difference Result 189 states and 189 transitions. [2019-01-31 16:58:19,679 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2019-01-31 16:58:19,679 INFO L78 Accepts]: Start accepts. Automaton has 124 states. Word has length 183 [2019-01-31 16:58:19,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:58:19,680 INFO L225 Difference]: With dead ends: 189 [2019-01-31 16:58:19,680 INFO L226 Difference]: Without dead ends: 188 [2019-01-31 16:58:19,681 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 242 SyntacticMatches, 22 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15367 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=11373, Invalid=15033, Unknown=0, NotChecked=0, Total=26406 [2019-01-31 16:58:19,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2019-01-31 16:58:19,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 187. [2019-01-31 16:58:19,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2019-01-31 16:58:19,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 187 transitions. [2019-01-31 16:58:19,685 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 187 transitions. Word has length 183 [2019-01-31 16:58:19,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:58:19,685 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 187 transitions. [2019-01-31 16:58:19,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has 124 states. [2019-01-31 16:58:19,685 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 187 transitions. [2019-01-31 16:58:19,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2019-01-31 16:58:19,686 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:58:19,686 INFO L402 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1] [2019-01-31 16:58:19,686 INFO L423 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:58:19,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:58:19,687 INFO L82 PathProgramCache]: Analyzing trace with hash 1602558476, now seen corresponding path program 61 times [2019-01-31 16:58:19,687 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:58:19,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:58:19,687 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:58:19,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:58:19,687 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:58:19,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:58:21,511 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:21,511 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:58:21,511 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:58:21,511 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:58:21,511 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:58:21,511 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:58:21,511 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 [2019-01-31 16:58:21,532 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:58:21,532 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:58:21,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:58:21,590 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:58:21,592 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 [2019-01-31 16:58:21,592 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:58:21,606 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:58:21,606 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:58:24,062 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:24,063 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:58:27,579 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:27,597 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:58:27,597 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 162 [2019-01-31 16:58:27,597 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:58:27,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 126 states [2019-01-31 16:58:27,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2019-01-31 16:58:27,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11475, Invalid=15257, Unknown=0, NotChecked=0, Total=26732 [2019-01-31 16:58:27,599 INFO L87 Difference]: Start difference. First operand 187 states and 187 transitions. Second operand 126 states. [2019-01-31 16:58:28,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:58:28,094 INFO L93 Difference]: Finished difference Result 192 states and 192 transitions. [2019-01-31 16:58:28,094 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2019-01-31 16:58:28,095 INFO L78 Accepts]: Start accepts. Automaton has 126 states. Word has length 186 [2019-01-31 16:58:28,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:58:28,096 INFO L225 Difference]: With dead ends: 192 [2019-01-31 16:58:28,096 INFO L226 Difference]: Without dead ends: 191 [2019-01-31 16:58:28,097 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 432 GetRequests, 246 SyntacticMatches, 24 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15864 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=11475, Invalid=15257, Unknown=0, NotChecked=0, Total=26732 [2019-01-31 16:58:28,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2019-01-31 16:58:28,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 190. [2019-01-31 16:58:28,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2019-01-31 16:58:28,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 190 transitions. [2019-01-31 16:58:28,101 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 190 transitions. Word has length 186 [2019-01-31 16:58:28,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:58:28,101 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 190 transitions. [2019-01-31 16:58:28,101 INFO L481 AbstractCegarLoop]: Interpolant automaton has 126 states. [2019-01-31 16:58:28,101 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 190 transitions. [2019-01-31 16:58:28,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2019-01-31 16:58:28,102 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:58:28,102 INFO L402 BasicCegarLoop]: trace histogram [63, 62, 62, 1, 1] [2019-01-31 16:58:28,102 INFO L423 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:58:28,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:58:28,103 INFO L82 PathProgramCache]: Analyzing trace with hash -1036862304, now seen corresponding path program 62 times [2019-01-31 16:58:28,103 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:58:28,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:58:28,103 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:58:28,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:58:28,103 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:58:28,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:58:30,076 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:30,076 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:58:30,076 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:58:30,076 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:58:30,077 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:58:30,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:58:30,077 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 [2019-01-31 16:58:30,085 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:58:30,085 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:58:30,327 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 63 check-sat command(s) [2019-01-31 16:58:30,327 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:58:30,333 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:58:30,336 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 [2019-01-31 16:58:30,336 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:58:30,344 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:58:30,344 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:58:32,610 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:32,611 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:58:36,379 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:36,398 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:58:36,398 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 163 [2019-01-31 16:58:36,398 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:58:36,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2019-01-31 16:58:36,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2019-01-31 16:58:36,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11577, Invalid=15483, Unknown=0, NotChecked=0, Total=27060 [2019-01-31 16:58:36,400 INFO L87 Difference]: Start difference. First operand 190 states and 190 transitions. Second operand 128 states. [2019-01-31 16:58:36,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:58:36,895 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2019-01-31 16:58:36,895 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2019-01-31 16:58:36,896 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 189 [2019-01-31 16:58:36,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:58:36,897 INFO L225 Difference]: With dead ends: 195 [2019-01-31 16:58:36,897 INFO L226 Difference]: Without dead ends: 194 [2019-01-31 16:58:36,898 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 439 GetRequests, 250 SyntacticMatches, 26 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16361 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=11577, Invalid=15483, Unknown=0, NotChecked=0, Total=27060 [2019-01-31 16:58:36,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2019-01-31 16:58:36,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 193. [2019-01-31 16:58:36,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2019-01-31 16:58:36,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 193 transitions. [2019-01-31 16:58:36,902 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 193 transitions. Word has length 189 [2019-01-31 16:58:36,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:58:36,902 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 193 transitions. [2019-01-31 16:58:36,902 INFO L481 AbstractCegarLoop]: Interpolant automaton has 128 states. [2019-01-31 16:58:36,902 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 193 transitions. [2019-01-31 16:58:36,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2019-01-31 16:58:36,903 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:58:36,903 INFO L402 BasicCegarLoop]: trace histogram [64, 63, 63, 1, 1] [2019-01-31 16:58:36,903 INFO L423 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:58:36,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:58:36,903 INFO L82 PathProgramCache]: Analyzing trace with hash 239935884, now seen corresponding path program 63 times [2019-01-31 16:58:36,904 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:58:36,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:58:36,904 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:58:36,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:58:36,905 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:58:36,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:58:39,084 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:39,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:58:39,084 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:58:39,084 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:58:39,084 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:58:39,085 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:58:39,085 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 [2019-01-31 16:58:39,097 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:58:39,097 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:58:39,157 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:58:39,158 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:58:39,164 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:58:39,166 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 [2019-01-31 16:58:39,166 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:58:39,174 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:58:39,174 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:58:41,502 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:41,502 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:58:45,380 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:45,400 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:58:45,400 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 164 [2019-01-31 16:58:45,400 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:58:45,401 INFO L459 AbstractCegarLoop]: Interpolant automaton has 130 states [2019-01-31 16:58:45,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2019-01-31 16:58:45,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11679, Invalid=15711, Unknown=0, NotChecked=0, Total=27390 [2019-01-31 16:58:45,404 INFO L87 Difference]: Start difference. First operand 193 states and 193 transitions. Second operand 130 states. [2019-01-31 16:58:45,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:58:45,933 INFO L93 Difference]: Finished difference Result 198 states and 198 transitions. [2019-01-31 16:58:45,933 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2019-01-31 16:58:45,933 INFO L78 Accepts]: Start accepts. Automaton has 130 states. Word has length 192 [2019-01-31 16:58:45,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:58:45,934 INFO L225 Difference]: With dead ends: 198 [2019-01-31 16:58:45,934 INFO L226 Difference]: Without dead ends: 197 [2019-01-31 16:58:45,935 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 254 SyntacticMatches, 28 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16858 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=11679, Invalid=15711, Unknown=0, NotChecked=0, Total=27390 [2019-01-31 16:58:45,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2019-01-31 16:58:45,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 196. [2019-01-31 16:58:45,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2019-01-31 16:58:45,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 196 transitions. [2019-01-31 16:58:45,941 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 196 transitions. Word has length 192 [2019-01-31 16:58:45,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:58:45,941 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 196 transitions. [2019-01-31 16:58:45,941 INFO L481 AbstractCegarLoop]: Interpolant automaton has 130 states. [2019-01-31 16:58:45,942 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 196 transitions. [2019-01-31 16:58:45,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2019-01-31 16:58:45,942 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:58:45,943 INFO L402 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1] [2019-01-31 16:58:45,943 INFO L423 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:58:45,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:58:45,943 INFO L82 PathProgramCache]: Analyzing trace with hash 1104381216, now seen corresponding path program 64 times [2019-01-31 16:58:45,943 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:58:45,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:58:45,944 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:58:45,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:58:45,944 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:58:45,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:58:47,885 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:47,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:58:47,885 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:58:47,885 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:58:47,886 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:58:47,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:58:47,886 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 [2019-01-31 16:58:47,893 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:58:47,894 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:58:47,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:58:47,953 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:58:47,959 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 [2019-01-31 16:58:47,959 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:58:47,974 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:58:47,974 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:58:50,609 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:50,609 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:58:54,454 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:54,472 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:58:54,472 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 165 [2019-01-31 16:58:54,473 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:58:54,473 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2019-01-31 16:58:54,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2019-01-31 16:58:54,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11781, Invalid=15941, Unknown=0, NotChecked=0, Total=27722 [2019-01-31 16:58:54,475 INFO L87 Difference]: Start difference. First operand 196 states and 196 transitions. Second operand 132 states. [2019-01-31 16:58:54,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:58:54,933 INFO L93 Difference]: Finished difference Result 201 states and 201 transitions. [2019-01-31 16:58:54,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2019-01-31 16:58:54,934 INFO L78 Accepts]: Start accepts. Automaton has 132 states. Word has length 195 [2019-01-31 16:58:54,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:58:54,935 INFO L225 Difference]: With dead ends: 201 [2019-01-31 16:58:54,935 INFO L226 Difference]: Without dead ends: 200 [2019-01-31 16:58:54,936 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 258 SyntacticMatches, 30 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17355 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=11781, Invalid=15941, Unknown=0, NotChecked=0, Total=27722 [2019-01-31 16:58:54,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2019-01-31 16:58:54,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 199. [2019-01-31 16:58:54,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2019-01-31 16:58:54,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 199 transitions. [2019-01-31 16:58:54,943 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 199 transitions. Word has length 195 [2019-01-31 16:58:54,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:58:54,943 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 199 transitions. [2019-01-31 16:58:54,943 INFO L481 AbstractCegarLoop]: Interpolant automaton has 132 states. [2019-01-31 16:58:54,943 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 199 transitions. [2019-01-31 16:58:54,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2019-01-31 16:58:54,944 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:58:54,944 INFO L402 BasicCegarLoop]: trace histogram [66, 65, 65, 1, 1] [2019-01-31 16:58:54,945 INFO L423 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:58:54,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:58:54,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1171360012, now seen corresponding path program 65 times [2019-01-31 16:58:54,945 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:58:54,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:58:54,946 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:58:54,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:58:54,946 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:58:54,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:58:56,898 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:56,898 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:58:56,898 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:58:56,898 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:58:56,899 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:58:56,899 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:58:56,899 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 [2019-01-31 16:58:56,906 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:58:56,907 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:58:57,168 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2019-01-31 16:58:57,169 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:58:57,176 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:58:57,183 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 [2019-01-31 16:58:57,183 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:58:57,192 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:58:57,192 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:58:59,862 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:58:59,863 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:59:03,680 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:59:03,699 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:59:03,699 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 166 [2019-01-31 16:59:03,699 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:59:03,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2019-01-31 16:59:03,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2019-01-31 16:59:03,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11883, Invalid=16173, Unknown=0, NotChecked=0, Total=28056 [2019-01-31 16:59:03,701 INFO L87 Difference]: Start difference. First operand 199 states and 199 transitions. Second operand 134 states. [2019-01-31 16:59:04,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:59:04,270 INFO L93 Difference]: Finished difference Result 204 states and 204 transitions. [2019-01-31 16:59:04,271 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2019-01-31 16:59:04,271 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 198 [2019-01-31 16:59:04,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:59:04,272 INFO L225 Difference]: With dead ends: 204 [2019-01-31 16:59:04,272 INFO L226 Difference]: Without dead ends: 203 [2019-01-31 16:59:04,273 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 262 SyntacticMatches, 32 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17852 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=11883, Invalid=16173, Unknown=0, NotChecked=0, Total=28056 [2019-01-31 16:59:04,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2019-01-31 16:59:04,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 202. [2019-01-31 16:59:04,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2019-01-31 16:59:04,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 202 transitions. [2019-01-31 16:59:04,278 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 202 transitions. Word has length 198 [2019-01-31 16:59:04,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:59:04,278 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 202 transitions. [2019-01-31 16:59:04,278 INFO L481 AbstractCegarLoop]: Interpolant automaton has 134 states. [2019-01-31 16:59:04,278 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 202 transitions. [2019-01-31 16:59:04,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2019-01-31 16:59:04,279 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:59:04,280 INFO L402 BasicCegarLoop]: trace histogram [67, 66, 66, 1, 1] [2019-01-31 16:59:04,280 INFO L423 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:59:04,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:59:04,280 INFO L82 PathProgramCache]: Analyzing trace with hash -623120992, now seen corresponding path program 66 times [2019-01-31 16:59:04,280 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:59:04,281 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:59:04,281 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:59:04,281 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:59:04,281 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:59:04,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:59:06,280 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:59:06,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:59:06,281 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:59:06,281 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:59:06,281 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:59:06,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:59:06,281 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 [2019-01-31 16:59:06,289 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:59:06,289 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:59:06,353 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:59:06,353 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:59:06,360 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:59:06,364 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 [2019-01-31 16:59:06,364 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:59:06,371 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:59:06,371 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:59:08,849 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:59:08,850 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:59:12,700 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:59:12,719 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:59:12,719 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 167 [2019-01-31 16:59:12,719 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:59:12,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 136 states [2019-01-31 16:59:12,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2019-01-31 16:59:12,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11985, Invalid=16407, Unknown=0, NotChecked=0, Total=28392 [2019-01-31 16:59:12,722 INFO L87 Difference]: Start difference. First operand 202 states and 202 transitions. Second operand 136 states. [2019-01-31 16:59:13,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:59:13,242 INFO L93 Difference]: Finished difference Result 207 states and 207 transitions. [2019-01-31 16:59:13,243 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2019-01-31 16:59:13,243 INFO L78 Accepts]: Start accepts. Automaton has 136 states. Word has length 201 [2019-01-31 16:59:13,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:59:13,244 INFO L225 Difference]: With dead ends: 207 [2019-01-31 16:59:13,245 INFO L226 Difference]: Without dead ends: 206 [2019-01-31 16:59:13,246 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 266 SyntacticMatches, 34 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18349 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=11985, Invalid=16407, Unknown=0, NotChecked=0, Total=28392 [2019-01-31 16:59:13,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2019-01-31 16:59:13,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 205. [2019-01-31 16:59:13,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2019-01-31 16:59:13,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 205 transitions. [2019-01-31 16:59:13,250 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 205 transitions. Word has length 201 [2019-01-31 16:59:13,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:59:13,250 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 205 transitions. [2019-01-31 16:59:13,250 INFO L481 AbstractCegarLoop]: Interpolant automaton has 136 states. [2019-01-31 16:59:13,250 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 205 transitions. [2019-01-31 16:59:13,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2019-01-31 16:59:13,251 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:59:13,251 INFO L402 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1] [2019-01-31 16:59:13,251 INFO L423 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:59:13,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:59:13,251 INFO L82 PathProgramCache]: Analyzing trace with hash -548777844, now seen corresponding path program 67 times [2019-01-31 16:59:13,252 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:59:13,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:59:13,252 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:59:13,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:59:13,252 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:59:13,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:59:15,674 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:59:15,674 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:59:15,674 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:59:15,675 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:59:15,675 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:59:15,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:59:15,675 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 [2019-01-31 16:59:15,684 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:59:15,685 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:59:15,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:59:15,748 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:59:15,751 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 [2019-01-31 16:59:15,751 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:59:15,762 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:59:15,762 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:59:18,335 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:59:18,335 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:59:22,290 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:59:22,309 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:59:22,309 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 168 [2019-01-31 16:59:22,309 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:59:22,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 138 states [2019-01-31 16:59:22,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 138 interpolants. [2019-01-31 16:59:22,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12087, Invalid=16643, Unknown=0, NotChecked=0, Total=28730 [2019-01-31 16:59:22,311 INFO L87 Difference]: Start difference. First operand 205 states and 205 transitions. Second operand 138 states. [2019-01-31 16:59:22,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:59:22,736 INFO L93 Difference]: Finished difference Result 210 states and 210 transitions. [2019-01-31 16:59:22,736 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2019-01-31 16:59:22,737 INFO L78 Accepts]: Start accepts. Automaton has 138 states. Word has length 204 [2019-01-31 16:59:22,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:59:22,737 INFO L225 Difference]: With dead ends: 210 [2019-01-31 16:59:22,737 INFO L226 Difference]: Without dead ends: 209 [2019-01-31 16:59:22,738 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 270 SyntacticMatches, 36 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18846 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=12087, Invalid=16643, Unknown=0, NotChecked=0, Total=28730 [2019-01-31 16:59:22,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2019-01-31 16:59:22,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 208. [2019-01-31 16:59:22,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2019-01-31 16:59:22,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 208 transitions. [2019-01-31 16:59:22,742 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 208 transitions. Word has length 204 [2019-01-31 16:59:22,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:59:22,742 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 208 transitions. [2019-01-31 16:59:22,742 INFO L481 AbstractCegarLoop]: Interpolant automaton has 138 states. [2019-01-31 16:59:22,742 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 208 transitions. [2019-01-31 16:59:22,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2019-01-31 16:59:22,743 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:59:22,743 INFO L402 BasicCegarLoop]: trace histogram [69, 68, 68, 1, 1] [2019-01-31 16:59:22,743 INFO L423 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:59:22,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:59:22,743 INFO L82 PathProgramCache]: Analyzing trace with hash -1995180512, now seen corresponding path program 68 times [2019-01-31 16:59:22,744 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:59:22,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:59:22,744 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:59:22,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:59:22,744 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:59:22,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:59:25,126 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:59:25,126 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:59:25,127 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:59:25,127 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:59:25,127 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:59:25,127 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:59:25,127 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 [2019-01-31 16:59:25,135 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:59:25,135 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:59:25,418 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2019-01-31 16:59:25,418 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:59:25,425 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:59:25,429 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 [2019-01-31 16:59:25,429 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:59:25,441 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:59:25,441 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:59:28,151 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:59:28,152 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:59:32,132 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:59:32,152 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:59:32,152 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 169 [2019-01-31 16:59:32,152 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:59:32,153 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2019-01-31 16:59:32,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2019-01-31 16:59:32,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12189, Invalid=16881, Unknown=0, NotChecked=0, Total=29070 [2019-01-31 16:59:32,154 INFO L87 Difference]: Start difference. First operand 208 states and 208 transitions. Second operand 140 states. [2019-01-31 16:59:32,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:59:32,694 INFO L93 Difference]: Finished difference Result 213 states and 213 transitions. [2019-01-31 16:59:32,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2019-01-31 16:59:32,695 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 207 [2019-01-31 16:59:32,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:59:32,696 INFO L225 Difference]: With dead ends: 213 [2019-01-31 16:59:32,696 INFO L226 Difference]: Without dead ends: 212 [2019-01-31 16:59:32,697 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 274 SyntacticMatches, 38 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19343 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=12189, Invalid=16881, Unknown=0, NotChecked=0, Total=29070 [2019-01-31 16:59:32,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2019-01-31 16:59:32,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 211. [2019-01-31 16:59:32,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 211 states. [2019-01-31 16:59:32,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 211 transitions. [2019-01-31 16:59:32,703 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 211 transitions. Word has length 207 [2019-01-31 16:59:32,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:59:32,703 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 211 transitions. [2019-01-31 16:59:32,703 INFO L481 AbstractCegarLoop]: Interpolant automaton has 140 states. [2019-01-31 16:59:32,704 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 211 transitions. [2019-01-31 16:59:32,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2019-01-31 16:59:32,704 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:59:32,705 INFO L402 BasicCegarLoop]: trace histogram [70, 69, 69, 1, 1] [2019-01-31 16:59:32,705 INFO L423 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:59:32,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:59:32,705 INFO L82 PathProgramCache]: Analyzing trace with hash -370182132, now seen corresponding path program 69 times [2019-01-31 16:59:32,705 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:59:32,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:59:32,706 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:59:32,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:59:32,706 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:59:32,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:59:35,306 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:59:35,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:59:35,307 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:59:35,307 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:59:35,307 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:59:35,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:59:35,307 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 [2019-01-31 16:59:35,315 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 16:59:35,315 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 16:59:35,384 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 16:59:35,384 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:59:35,391 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:59:35,394 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 [2019-01-31 16:59:35,395 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:59:35,402 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:59:35,402 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:59:38,170 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:59:38,170 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:59:42,140 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:59:42,158 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:59:42,159 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 170 [2019-01-31 16:59:42,159 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:59:42,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 142 states [2019-01-31 16:59:42,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2019-01-31 16:59:42,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12291, Invalid=17121, Unknown=0, NotChecked=0, Total=29412 [2019-01-31 16:59:42,161 INFO L87 Difference]: Start difference. First operand 211 states and 211 transitions. Second operand 142 states. [2019-01-31 16:59:42,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:59:42,648 INFO L93 Difference]: Finished difference Result 216 states and 216 transitions. [2019-01-31 16:59:42,648 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2019-01-31 16:59:42,648 INFO L78 Accepts]: Start accepts. Automaton has 142 states. Word has length 210 [2019-01-31 16:59:42,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:59:42,649 INFO L225 Difference]: With dead ends: 216 [2019-01-31 16:59:42,650 INFO L226 Difference]: Without dead ends: 215 [2019-01-31 16:59:42,651 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 [2019-01-31 16:59:42,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2019-01-31 16:59:42,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 214. [2019-01-31 16:59:42,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2019-01-31 16:59:42,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 214 transitions. [2019-01-31 16:59:42,657 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 214 transitions. Word has length 210 [2019-01-31 16:59:42,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:59:42,657 INFO L480 AbstractCegarLoop]: Abstraction has 214 states and 214 transitions. [2019-01-31 16:59:42,657 INFO L481 AbstractCegarLoop]: Interpolant automaton has 142 states. [2019-01-31 16:59:42,657 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 214 transitions. [2019-01-31 16:59:42,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2019-01-31 16:59:42,658 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:59:42,658 INFO L402 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1] [2019-01-31 16:59:42,658 INFO L423 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:59:42,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:59:42,659 INFO L82 PathProgramCache]: Analyzing trace with hash 1380163232, now seen corresponding path program 70 times [2019-01-31 16:59:42,659 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:59:42,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:59:42,660 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 16:59:42,660 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:59:42,660 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:59:42,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:59:44,918 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:59:44,918 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:59:44,918 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:59:44,918 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:59:44,919 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:59:44,919 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:59:44,919 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 [2019-01-31 16:59:44,929 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:59:44,929 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 16:59:44,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:59:44,995 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:59:45,001 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 [2019-01-31 16:59:45,001 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:59:45,010 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:59:45,010 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:59:47,990 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:59:47,990 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 16:59:52,091 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:59:52,111 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 16:59:52,111 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 171 [2019-01-31 16:59:52,111 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 16:59:52,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 144 states [2019-01-31 16:59:52,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2019-01-31 16:59:52,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12393, Invalid=17363, Unknown=0, NotChecked=0, Total=29756 [2019-01-31 16:59:52,113 INFO L87 Difference]: Start difference. First operand 214 states and 214 transitions. Second operand 144 states. [2019-01-31 16:59:52,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 16:59:52,577 INFO L93 Difference]: Finished difference Result 219 states and 219 transitions. [2019-01-31 16:59:52,577 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2019-01-31 16:59:52,577 INFO L78 Accepts]: Start accepts. Automaton has 144 states. Word has length 213 [2019-01-31 16:59:52,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 16:59:52,579 INFO L225 Difference]: With dead ends: 219 [2019-01-31 16:59:52,579 INFO L226 Difference]: Without dead ends: 218 [2019-01-31 16:59:52,580 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 282 SyntacticMatches, 42 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20337 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=12393, Invalid=17363, Unknown=0, NotChecked=0, Total=29756 [2019-01-31 16:59:52,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2019-01-31 16:59:52,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 217. [2019-01-31 16:59:52,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2019-01-31 16:59:52,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 217 transitions. [2019-01-31 16:59:52,586 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 217 transitions. Word has length 213 [2019-01-31 16:59:52,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 16:59:52,586 INFO L480 AbstractCegarLoop]: Abstraction has 217 states and 217 transitions. [2019-01-31 16:59:52,586 INFO L481 AbstractCegarLoop]: Interpolant automaton has 144 states. [2019-01-31 16:59:52,586 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 217 transitions. [2019-01-31 16:59:52,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2019-01-31 16:59:52,587 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 16:59:52,587 INFO L402 BasicCegarLoop]: trace histogram [72, 71, 71, 1, 1] [2019-01-31 16:59:52,588 INFO L423 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 16:59:52,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 16:59:52,588 INFO L82 PathProgramCache]: Analyzing trace with hash 720961420, now seen corresponding path program 71 times [2019-01-31 16:59:52,588 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 16:59:52,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:59:52,589 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 16:59:52,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 16:59:52,589 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 16:59:52,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 16:59:54,986 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 0 proven. 7597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:59:54,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:59:54,987 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 16:59:54,987 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 16:59:54,987 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 16:59:54,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 16:59:54,987 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 [2019-01-31 16:59:55,006 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 16:59:55,006 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 16:59:55,327 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 72 check-sat command(s) [2019-01-31 16:59:55,327 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 16:59:55,335 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 16:59:55,337 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 [2019-01-31 16:59:55,337 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 16:59:55,347 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 16:59:55,348 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 16:59:58,230 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 0 proven. 7597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 16:59:58,231 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:00:02,296 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 0 proven. 7597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:00:02,315 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:00:02,315 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 172 [2019-01-31 17:00:02,315 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:00:02,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2019-01-31 17:00:02,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2019-01-31 17:00:02,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12495, Invalid=17607, Unknown=0, NotChecked=0, Total=30102 [2019-01-31 17:00:02,318 INFO L87 Difference]: Start difference. First operand 217 states and 217 transitions. Second operand 146 states. [2019-01-31 17:00:02,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:00:02,796 INFO L93 Difference]: Finished difference Result 222 states and 222 transitions. [2019-01-31 17:00:02,796 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2019-01-31 17:00:02,797 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 216 [2019-01-31 17:00:02,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:00:02,798 INFO L225 Difference]: With dead ends: 222 [2019-01-31 17:00:02,798 INFO L226 Difference]: Without dead ends: 221 [2019-01-31 17:00:02,799 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 286 SyntacticMatches, 44 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20834 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=12495, Invalid=17607, Unknown=0, NotChecked=0, Total=30102 [2019-01-31 17:00:02,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2019-01-31 17:00:02,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 220. [2019-01-31 17:00:02,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2019-01-31 17:00:02,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 220 transitions. [2019-01-31 17:00:02,804 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 220 transitions. Word has length 216 [2019-01-31 17:00:02,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:00:02,804 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 220 transitions. [2019-01-31 17:00:02,804 INFO L481 AbstractCegarLoop]: Interpolant automaton has 146 states. [2019-01-31 17:00:02,804 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 220 transitions. [2019-01-31 17:00:02,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2019-01-31 17:00:02,805 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:00:02,805 INFO L402 BasicCegarLoop]: trace histogram [73, 72, 72, 1, 1] [2019-01-31 17:00:02,805 INFO L423 AbstractCegarLoop]: === Iteration 73 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:00:02,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:00:02,805 INFO L82 PathProgramCache]: Analyzing trace with hash -969742560, now seen corresponding path program 72 times [2019-01-31 17:00:02,805 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:00:02,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:00:02,806 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:00:02,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:00:02,806 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:00:02,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:00:05,296 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 0 proven. 7812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:00:05,296 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:00:05,296 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:00:05,296 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:00:05,296 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:00:05,296 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:00:05,296 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 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 [2019-01-31 17:00:05,305 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:00:05,305 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:00:05,378 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:00:05,378 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:00:05,386 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:00:05,388 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 [2019-01-31 17:00:05,388 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:00:05,401 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:00:05,401 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:00:08,660 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 0 proven. 7812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:00:08,661 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:00:12,782 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 0 proven. 7812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:00:12,802 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:00:12,802 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 173 [2019-01-31 17:00:12,802 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:00:12,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 148 states [2019-01-31 17:00:12,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2019-01-31 17:00:12,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12597, Invalid=17853, Unknown=0, NotChecked=0, Total=30450 [2019-01-31 17:00:12,805 INFO L87 Difference]: Start difference. First operand 220 states and 220 transitions. Second operand 148 states. [2019-01-31 17:00:13,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:00:13,289 INFO L93 Difference]: Finished difference Result 225 states and 225 transitions. [2019-01-31 17:00:13,289 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2019-01-31 17:00:13,289 INFO L78 Accepts]: Start accepts. Automaton has 148 states. Word has length 219 [2019-01-31 17:00:13,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:00:13,291 INFO L225 Difference]: With dead ends: 225 [2019-01-31 17:00:13,291 INFO L226 Difference]: Without dead ends: 224 [2019-01-31 17:00:13,292 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 290 SyntacticMatches, 46 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21331 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=12597, Invalid=17853, Unknown=0, NotChecked=0, Total=30450 [2019-01-31 17:00:13,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2019-01-31 17:00:13,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 223. [2019-01-31 17:00:13,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2019-01-31 17:00:13,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 223 transitions. [2019-01-31 17:00:13,296 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 223 transitions. Word has length 219 [2019-01-31 17:00:13,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:00:13,296 INFO L480 AbstractCegarLoop]: Abstraction has 223 states and 223 transitions. [2019-01-31 17:00:13,296 INFO L481 AbstractCegarLoop]: Interpolant automaton has 148 states. [2019-01-31 17:00:13,296 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 223 transitions. [2019-01-31 17:00:13,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2019-01-31 17:00:13,297 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:00:13,297 INFO L402 BasicCegarLoop]: trace histogram [74, 73, 73, 1, 1] [2019-01-31 17:00:13,297 INFO L423 AbstractCegarLoop]: === Iteration 74 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:00:13,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:00:13,297 INFO L82 PathProgramCache]: Analyzing trace with hash -1650530548, now seen corresponding path program 73 times [2019-01-31 17:00:13,297 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:00:13,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:00:13,298 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:00:13,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:00:13,298 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:00:13,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:00:15,871 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:00:15,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:00:15,872 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:00:15,872 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:00:15,872 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:00:15,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:00:15,872 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 [2019-01-31 17:00:15,880 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:00:15,880 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:00:15,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:00:15,947 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:00:15,953 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 [2019-01-31 17:00:15,953 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:00:15,961 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:00:15,961 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:00:19,061 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:00:19,061 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:00:23,229 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:00:23,247 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:00:23,247 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 174 [2019-01-31 17:00:23,247 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:00:23,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 150 states [2019-01-31 17:00:23,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 150 interpolants. [2019-01-31 17:00:23,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12699, Invalid=18101, Unknown=0, NotChecked=0, Total=30800 [2019-01-31 17:00:23,250 INFO L87 Difference]: Start difference. First operand 223 states and 223 transitions. Second operand 150 states. [2019-01-31 17:00:23,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:00:23,791 INFO L93 Difference]: Finished difference Result 228 states and 228 transitions. [2019-01-31 17:00:23,791 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2019-01-31 17:00:23,791 INFO L78 Accepts]: Start accepts. Automaton has 150 states. Word has length 222 [2019-01-31 17:00:23,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:00:23,792 INFO L225 Difference]: With dead ends: 228 [2019-01-31 17:00:23,792 INFO L226 Difference]: Without dead ends: 227 [2019-01-31 17:00:23,793 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 516 GetRequests, 294 SyntacticMatches, 48 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21828 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=12699, Invalid=18101, Unknown=0, NotChecked=0, Total=30800 [2019-01-31 17:00:23,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2019-01-31 17:00:23,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 226. [2019-01-31 17:00:23,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2019-01-31 17:00:23,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 226 transitions. [2019-01-31 17:00:23,797 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 226 transitions. Word has length 222 [2019-01-31 17:00:23,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:00:23,797 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 226 transitions. [2019-01-31 17:00:23,798 INFO L481 AbstractCegarLoop]: Interpolant automaton has 150 states. [2019-01-31 17:00:23,798 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 226 transitions. [2019-01-31 17:00:23,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2019-01-31 17:00:23,798 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:00:23,799 INFO L402 BasicCegarLoop]: trace histogram [75, 74, 74, 1, 1] [2019-01-31 17:00:23,799 INFO L423 AbstractCegarLoop]: === Iteration 75 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:00:23,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:00:23,799 INFO L82 PathProgramCache]: Analyzing trace with hash 2125057952, now seen corresponding path program 74 times [2019-01-31 17:00:23,799 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:00:23,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:00:23,800 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:00:23,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:00:23,800 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:00:23,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:00:26,625 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 0 proven. 8251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:00:26,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:00:26,625 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:00:26,625 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:00:26,625 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:00:26,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:00:26,625 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 [2019-01-31 17:00:26,633 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:00:26,634 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:00:26,936 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 75 check-sat command(s) [2019-01-31 17:00:26,937 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:00:26,944 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:00:26,949 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 [2019-01-31 17:00:26,950 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:00:26,959 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:00:26,959 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:00:30,036 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 0 proven. 8251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:00:30,037 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:00:34,131 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 0 proven. 8251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:00:34,150 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:00:34,150 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 175 [2019-01-31 17:00:34,150 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:00:34,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2019-01-31 17:00:34,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2019-01-31 17:00:34,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12801, Invalid=18351, Unknown=0, NotChecked=0, Total=31152 [2019-01-31 17:00:34,152 INFO L87 Difference]: Start difference. First operand 226 states and 226 transitions. Second operand 152 states. [2019-01-31 17:00:34,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:00:34,740 INFO L93 Difference]: Finished difference Result 231 states and 231 transitions. [2019-01-31 17:00:34,741 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2019-01-31 17:00:34,741 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 225 [2019-01-31 17:00:34,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:00:34,743 INFO L225 Difference]: With dead ends: 231 [2019-01-31 17:00:34,743 INFO L226 Difference]: Without dead ends: 230 [2019-01-31 17:00:34,744 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 298 SyntacticMatches, 50 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22325 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=12801, Invalid=18351, Unknown=0, NotChecked=0, Total=31152 [2019-01-31 17:00:34,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2019-01-31 17:00:34,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 229. [2019-01-31 17:00:34,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2019-01-31 17:00:34,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 229 transitions. [2019-01-31 17:00:34,750 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 229 transitions. Word has length 225 [2019-01-31 17:00:34,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:00:34,750 INFO L480 AbstractCegarLoop]: Abstraction has 229 states and 229 transitions. [2019-01-31 17:00:34,751 INFO L481 AbstractCegarLoop]: Interpolant automaton has 152 states. [2019-01-31 17:00:34,751 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 229 transitions. [2019-01-31 17:00:34,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2019-01-31 17:00:34,752 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:00:34,752 INFO L402 BasicCegarLoop]: trace histogram [76, 75, 75, 1, 1] [2019-01-31 17:00:34,752 INFO L423 AbstractCegarLoop]: === Iteration 76 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:00:34,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:00:34,753 INFO L82 PathProgramCache]: Analyzing trace with hash -216453492, now seen corresponding path program 75 times [2019-01-31 17:00:34,753 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:00:34,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:00:34,754 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:00:34,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:00:34,754 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:00:34,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:00:37,589 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 0 proven. 8475 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:00:37,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:00:37,589 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:00:37,589 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:00:37,589 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:00:37,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:00:37,590 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 [2019-01-31 17:00:37,599 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:00:37,599 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:00:37,676 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:00:37,677 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:00:37,684 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:00:37,686 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 [2019-01-31 17:00:37,686 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:00:37,694 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:00:37,694 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:00:40,901 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 0 proven. 8475 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:00:40,901 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:00:44,987 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 0 proven. 8475 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:00:45,007 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:00:45,008 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 176 [2019-01-31 17:00:45,008 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:00:45,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 154 states [2019-01-31 17:00:45,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2019-01-31 17:00:45,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12903, Invalid=18603, Unknown=0, NotChecked=0, Total=31506 [2019-01-31 17:00:45,010 INFO L87 Difference]: Start difference. First operand 229 states and 229 transitions. Second operand 154 states. [2019-01-31 17:00:45,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:00:45,658 INFO L93 Difference]: Finished difference Result 234 states and 234 transitions. [2019-01-31 17:00:45,658 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2019-01-31 17:00:45,658 INFO L78 Accepts]: Start accepts. Automaton has 154 states. Word has length 228 [2019-01-31 17:00:45,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:00:45,659 INFO L225 Difference]: With dead ends: 234 [2019-01-31 17:00:45,659 INFO L226 Difference]: Without dead ends: 233 [2019-01-31 17:00:45,660 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 302 SyntacticMatches, 52 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22822 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=12903, Invalid=18603, Unknown=0, NotChecked=0, Total=31506 [2019-01-31 17:00:45,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2019-01-31 17:00:45,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 232. [2019-01-31 17:00:45,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2019-01-31 17:00:45,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 232 transitions. [2019-01-31 17:00:45,667 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 232 transitions. Word has length 228 [2019-01-31 17:00:45,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:00:45,667 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 232 transitions. [2019-01-31 17:00:45,667 INFO L481 AbstractCegarLoop]: Interpolant automaton has 154 states. [2019-01-31 17:00:45,667 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 232 transitions. [2019-01-31 17:00:45,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2019-01-31 17:00:45,669 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:00:45,669 INFO L402 BasicCegarLoop]: trace histogram [77, 76, 76, 1, 1] [2019-01-31 17:00:45,669 INFO L423 AbstractCegarLoop]: === Iteration 77 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:00:45,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:00:45,669 INFO L82 PathProgramCache]: Analyzing trace with hash -1620027360, now seen corresponding path program 76 times [2019-01-31 17:00:45,670 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:00:45,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:00:45,670 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:00:45,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:00:45,671 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:00:45,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:00:48,537 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 0 proven. 8702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:00:48,537 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:00:48,537 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:00:48,537 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:00:48,537 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:00:48,538 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:00:48,538 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 [2019-01-31 17:00:48,545 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:00:48,546 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:00:48,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:00:48,618 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:00:48,620 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 [2019-01-31 17:00:48,620 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:00:48,628 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:00:48,628 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:00:52,087 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 0 proven. 8702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:00:52,087 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:00:56,032 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 0 proven. 8702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:00:56,052 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:00:56,052 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 177 [2019-01-31 17:00:56,052 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:00:56,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 156 states [2019-01-31 17:00:56,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 156 interpolants. [2019-01-31 17:00:56,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13005, Invalid=18857, Unknown=0, NotChecked=0, Total=31862 [2019-01-31 17:00:56,055 INFO L87 Difference]: Start difference. First operand 232 states and 232 transitions. Second operand 156 states. [2019-01-31 17:00:56,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:00:56,677 INFO L93 Difference]: Finished difference Result 237 states and 237 transitions. [2019-01-31 17:00:56,677 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2019-01-31 17:00:56,677 INFO L78 Accepts]: Start accepts. Automaton has 156 states. Word has length 231 [2019-01-31 17:00:56,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:00:56,678 INFO L225 Difference]: With dead ends: 237 [2019-01-31 17:00:56,678 INFO L226 Difference]: Without dead ends: 236 [2019-01-31 17:00:56,679 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 [2019-01-31 17:00:56,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2019-01-31 17:00:56,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 235. [2019-01-31 17:00:56,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 235 states. [2019-01-31 17:00:56,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 235 transitions. [2019-01-31 17:00:56,684 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 235 transitions. Word has length 231 [2019-01-31 17:00:56,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:00:56,684 INFO L480 AbstractCegarLoop]: Abstraction has 235 states and 235 transitions. [2019-01-31 17:00:56,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has 156 states. [2019-01-31 17:00:56,684 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 235 transitions. [2019-01-31 17:00:56,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2019-01-31 17:00:56,685 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:00:56,685 INFO L402 BasicCegarLoop]: trace histogram [78, 77, 77, 1, 1] [2019-01-31 17:00:56,685 INFO L423 AbstractCegarLoop]: === Iteration 78 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:00:56,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:00:56,685 INFO L82 PathProgramCache]: Analyzing trace with hash 312464908, now seen corresponding path program 77 times [2019-01-31 17:00:56,686 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:00:56,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:00:56,686 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:00:56,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:00:56,686 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:00:56,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:00:59,592 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 0 proven. 8932 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:00:59,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:00:59,593 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:00:59,593 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:00:59,593 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:00:59,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:00:59,593 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 [2019-01-31 17:00:59,601 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:00:59,601 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:00:59,977 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2019-01-31 17:00:59,977 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:00:59,986 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:00:59,990 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 [2019-01-31 17:00:59,990 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:01:00,000 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:01:00,000 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:01:03,484 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 0 proven. 8932 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:01:03,484 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:01:07,716 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 0 proven. 8932 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:01:07,735 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:01:07,735 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78, 78] total 178 [2019-01-31 17:01:07,735 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:01:07,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 158 states [2019-01-31 17:01:07,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2019-01-31 17:01:07,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13107, Invalid=19113, Unknown=0, NotChecked=0, Total=32220 [2019-01-31 17:01:07,737 INFO L87 Difference]: Start difference. First operand 235 states and 235 transitions. Second operand 158 states. [2019-01-31 17:01:08,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:01:08,397 INFO L93 Difference]: Finished difference Result 240 states and 240 transitions. [2019-01-31 17:01:08,397 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2019-01-31 17:01:08,397 INFO L78 Accepts]: Start accepts. Automaton has 158 states. Word has length 234 [2019-01-31 17:01:08,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:01:08,398 INFO L225 Difference]: With dead ends: 240 [2019-01-31 17:01:08,398 INFO L226 Difference]: Without dead ends: 239 [2019-01-31 17:01:08,399 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 [2019-01-31 17:01:08,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2019-01-31 17:01:08,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 238. [2019-01-31 17:01:08,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2019-01-31 17:01:08,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 238 transitions. [2019-01-31 17:01:08,403 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 238 transitions. Word has length 234 [2019-01-31 17:01:08,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:01:08,404 INFO L480 AbstractCegarLoop]: Abstraction has 238 states and 238 transitions. [2019-01-31 17:01:08,404 INFO L481 AbstractCegarLoop]: Interpolant automaton has 158 states. [2019-01-31 17:01:08,404 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 238 transitions. [2019-01-31 17:01:08,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2019-01-31 17:01:08,404 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:01:08,405 INFO L402 BasicCegarLoop]: trace histogram [79, 78, 78, 1, 1] [2019-01-31 17:01:08,405 INFO L423 AbstractCegarLoop]: === Iteration 79 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:01:08,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:01:08,405 INFO L82 PathProgramCache]: Analyzing trace with hash 1447985312, now seen corresponding path program 78 times [2019-01-31 17:01:08,405 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:01:08,405 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:01:08,405 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:01:08,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:01:08,406 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:01:08,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:01:11,238 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 0 proven. 9165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:01:11,239 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:01:11,239 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:01:11,239 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:01:11,239 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:01:11,239 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:01:11,239 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 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 [2019-01-31 17:01:11,248 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:01:11,248 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:01:11,325 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:01:11,326 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:01:11,333 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:01:11,336 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 [2019-01-31 17:01:11,336 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:01:11,345 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:01:11,345 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:01:14,959 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 0 proven. 9165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:01:14,959 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:01:19,429 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 0 proven. 9165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:01:19,448 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:01:19,448 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 179 [2019-01-31 17:01:19,448 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:01:19,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 160 states [2019-01-31 17:01:19,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2019-01-31 17:01:19,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13209, Invalid=19371, Unknown=0, NotChecked=0, Total=32580 [2019-01-31 17:01:19,450 INFO L87 Difference]: Start difference. First operand 238 states and 238 transitions. Second operand 160 states. [2019-01-31 17:01:20,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:01:20,045 INFO L93 Difference]: Finished difference Result 243 states and 243 transitions. [2019-01-31 17:01:20,046 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2019-01-31 17:01:20,046 INFO L78 Accepts]: Start accepts. Automaton has 160 states. Word has length 237 [2019-01-31 17:01:20,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:01:20,048 INFO L225 Difference]: With dead ends: 243 [2019-01-31 17:01:20,048 INFO L226 Difference]: Without dead ends: 242 [2019-01-31 17:01:20,049 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 [2019-01-31 17:01:20,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2019-01-31 17:01:20,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 241. [2019-01-31 17:01:20,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2019-01-31 17:01:20,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 241 transitions. [2019-01-31 17:01:20,055 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 241 transitions. Word has length 237 [2019-01-31 17:01:20,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:01:20,055 INFO L480 AbstractCegarLoop]: Abstraction has 241 states and 241 transitions. [2019-01-31 17:01:20,055 INFO L481 AbstractCegarLoop]: Interpolant automaton has 160 states. [2019-01-31 17:01:20,056 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 241 transitions. [2019-01-31 17:01:20,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2019-01-31 17:01:20,057 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:01:20,057 INFO L402 BasicCegarLoop]: trace histogram [80, 79, 79, 1, 1] [2019-01-31 17:01:20,057 INFO L423 AbstractCegarLoop]: === Iteration 80 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:01:20,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:01:20,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1721049716, now seen corresponding path program 79 times [2019-01-31 17:01:20,057 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:01:20,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:01:20,058 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:01:20,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:01:20,058 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:01:20,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:01:23,206 INFO L134 CoverageAnalysis]: Checked inductivity of 9401 backedges. 0 proven. 9401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:01:23,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:01:23,206 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:01:23,206 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:01:23,206 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:01:23,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:01:23,206 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 [2019-01-31 17:01:23,215 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:01:23,215 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:01:23,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:01:23,288 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:01:23,290 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 [2019-01-31 17:01:23,290 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:01:23,305 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:01:23,305 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:01:26,884 INFO L134 CoverageAnalysis]: Checked inductivity of 9401 backedges. 0 proven. 9401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:01:26,884 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:01:31,138 INFO L134 CoverageAnalysis]: Checked inductivity of 9401 backedges. 0 proven. 9401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:01:31,158 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:01:31,159 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 180 [2019-01-31 17:01:31,159 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:01:31,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 162 states [2019-01-31 17:01:31,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 162 interpolants. [2019-01-31 17:01:31,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13311, Invalid=19631, Unknown=0, NotChecked=0, Total=32942 [2019-01-31 17:01:31,161 INFO L87 Difference]: Start difference. First operand 241 states and 241 transitions. Second operand 162 states. [2019-01-31 17:01:31,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:01:31,764 INFO L93 Difference]: Finished difference Result 246 states and 246 transitions. [2019-01-31 17:01:31,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2019-01-31 17:01:31,765 INFO L78 Accepts]: Start accepts. Automaton has 162 states. Word has length 240 [2019-01-31 17:01:31,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:01:31,766 INFO L225 Difference]: With dead ends: 246 [2019-01-31 17:01:31,766 INFO L226 Difference]: Without dead ends: 245 [2019-01-31 17:01:31,767 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 558 GetRequests, 318 SyntacticMatches, 60 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24810 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=13311, Invalid=19631, Unknown=0, NotChecked=0, Total=32942 [2019-01-31 17:01:31,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2019-01-31 17:01:31,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 244. [2019-01-31 17:01:31,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2019-01-31 17:01:31,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 244 transitions. [2019-01-31 17:01:31,771 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 244 transitions. Word has length 240 [2019-01-31 17:01:31,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:01:31,772 INFO L480 AbstractCegarLoop]: Abstraction has 244 states and 244 transitions. [2019-01-31 17:01:31,772 INFO L481 AbstractCegarLoop]: Interpolant automaton has 162 states. [2019-01-31 17:01:31,772 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 244 transitions. [2019-01-31 17:01:31,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2019-01-31 17:01:31,772 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:01:31,773 INFO L402 BasicCegarLoop]: trace histogram [81, 80, 80, 1, 1] [2019-01-31 17:01:31,773 INFO L423 AbstractCegarLoop]: === Iteration 81 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:01:31,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:01:31,773 INFO L82 PathProgramCache]: Analyzing trace with hash 1527531808, now seen corresponding path program 80 times [2019-01-31 17:01:31,773 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:01:31,774 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:01:31,774 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:01:31,774 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:01:31,774 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:01:31,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:01:35,320 INFO L134 CoverageAnalysis]: Checked inductivity of 9640 backedges. 0 proven. 9640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:01:35,320 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:01:35,320 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:01:35,321 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:01:35,321 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:01:35,321 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:01:35,321 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 [2019-01-31 17:01:35,329 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:01:35,330 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:01:35,787 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 81 check-sat command(s) [2019-01-31 17:01:35,788 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:01:35,795 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:01:35,798 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 [2019-01-31 17:01:35,798 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:01:35,808 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:01:35,808 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:01:39,606 INFO L134 CoverageAnalysis]: Checked inductivity of 9640 backedges. 0 proven. 9640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:01:39,606 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:01:43,811 INFO L134 CoverageAnalysis]: Checked inductivity of 9640 backedges. 0 proven. 9640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:01:43,830 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:01:43,830 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 181 [2019-01-31 17:01:43,830 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:01:43,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 164 states [2019-01-31 17:01:43,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2019-01-31 17:01:43,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13413, Invalid=19893, Unknown=0, NotChecked=0, Total=33306 [2019-01-31 17:01:43,832 INFO L87 Difference]: Start difference. First operand 244 states and 244 transitions. Second operand 164 states. [2019-01-31 17:01:44,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:01:44,397 INFO L93 Difference]: Finished difference Result 249 states and 249 transitions. [2019-01-31 17:01:44,397 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2019-01-31 17:01:44,397 INFO L78 Accepts]: Start accepts. Automaton has 164 states. Word has length 243 [2019-01-31 17:01:44,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:01:44,399 INFO L225 Difference]: With dead ends: 249 [2019-01-31 17:01:44,399 INFO L226 Difference]: Without dead ends: 248 [2019-01-31 17:01:44,400 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 565 GetRequests, 322 SyntacticMatches, 62 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25307 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=13413, Invalid=19893, Unknown=0, NotChecked=0, Total=33306 [2019-01-31 17:01:44,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2019-01-31 17:01:44,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 247. [2019-01-31 17:01:44,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2019-01-31 17:01:44,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 247 transitions. [2019-01-31 17:01:44,405 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 247 transitions. Word has length 243 [2019-01-31 17:01:44,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:01:44,405 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 247 transitions. [2019-01-31 17:01:44,405 INFO L481 AbstractCegarLoop]: Interpolant automaton has 164 states. [2019-01-31 17:01:44,405 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 247 transitions. [2019-01-31 17:01:44,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2019-01-31 17:01:44,406 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:01:44,406 INFO L402 BasicCegarLoop]: trace histogram [82, 81, 81, 1, 1] [2019-01-31 17:01:44,406 INFO L423 AbstractCegarLoop]: === Iteration 82 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:01:44,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:01:44,406 INFO L82 PathProgramCache]: Analyzing trace with hash 1521632524, now seen corresponding path program 81 times [2019-01-31 17:01:44,406 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:01:44,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:01:44,407 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:01:44,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:01:44,407 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:01:44,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:01:47,379 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 0 proven. 9882 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:01:47,379 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:01:47,380 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:01:47,380 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:01:47,380 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:01:47,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:01:47,380 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 [2019-01-31 17:01:47,388 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:01:47,389 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:01:47,470 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:01:47,471 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:01:47,478 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:01:47,481 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 [2019-01-31 17:01:47,481 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:01:47,493 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:01:47,493 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:01:51,446 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 0 proven. 9882 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:01:51,446 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:01:55,823 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 0 proven. 9882 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:01:55,843 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:01:55,843 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82, 82] total 182 [2019-01-31 17:01:55,843 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:01:55,844 INFO L459 AbstractCegarLoop]: Interpolant automaton has 166 states [2019-01-31 17:01:55,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 166 interpolants. [2019-01-31 17:01:55,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13515, Invalid=20157, Unknown=0, NotChecked=0, Total=33672 [2019-01-31 17:01:55,846 INFO L87 Difference]: Start difference. First operand 247 states and 247 transitions. Second operand 166 states. [2019-01-31 17:01:56,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:01:56,443 INFO L93 Difference]: Finished difference Result 252 states and 252 transitions. [2019-01-31 17:01:56,444 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2019-01-31 17:01:56,444 INFO L78 Accepts]: Start accepts. Automaton has 166 states. Word has length 246 [2019-01-31 17:01:56,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:01:56,445 INFO L225 Difference]: With dead ends: 252 [2019-01-31 17:01:56,445 INFO L226 Difference]: Without dead ends: 251 [2019-01-31 17:01:56,446 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 [2019-01-31 17:01:56,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2019-01-31 17:01:56,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 250. [2019-01-31 17:01:56,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 250 states. [2019-01-31 17:01:56,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 250 transitions. [2019-01-31 17:01:56,450 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 250 transitions. Word has length 246 [2019-01-31 17:01:56,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:01:56,450 INFO L480 AbstractCegarLoop]: Abstraction has 250 states and 250 transitions. [2019-01-31 17:01:56,450 INFO L481 AbstractCegarLoop]: Interpolant automaton has 166 states. [2019-01-31 17:01:56,451 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 250 transitions. [2019-01-31 17:01:56,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2019-01-31 17:01:56,451 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:01:56,451 INFO L402 BasicCegarLoop]: trace histogram [83, 82, 82, 1, 1] [2019-01-31 17:01:56,452 INFO L423 AbstractCegarLoop]: === Iteration 83 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:01:56,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:01:56,452 INFO L82 PathProgramCache]: Analyzing trace with hash 1869722016, now seen corresponding path program 82 times [2019-01-31 17:01:56,452 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:01:56,452 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:01:56,453 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:01:56,453 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:01:56,453 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:01:56,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:01:59,597 INFO L134 CoverageAnalysis]: Checked inductivity of 10127 backedges. 0 proven. 10127 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:01:59,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:01:59,598 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:01:59,598 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:01:59,598 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:01:59,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:01:59,598 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 [2019-01-31 17:01:59,607 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:01:59,607 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:01:59,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:01:59,681 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:01:59,683 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 [2019-01-31 17:01:59,683 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:01:59,692 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:01:59,692 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:02:03,697 INFO L134 CoverageAnalysis]: Checked inductivity of 10127 backedges. 0 proven. 10127 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:02:03,697 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:02:07,724 INFO L134 CoverageAnalysis]: Checked inductivity of 10127 backedges. 0 proven. 10127 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:02:07,744 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:02:07,745 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 183 [2019-01-31 17:02:07,745 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:02:07,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 168 states [2019-01-31 17:02:07,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 168 interpolants. [2019-01-31 17:02:07,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13617, Invalid=20423, Unknown=0, NotChecked=0, Total=34040 [2019-01-31 17:02:07,747 INFO L87 Difference]: Start difference. First operand 250 states and 250 transitions. Second operand 168 states. [2019-01-31 17:02:08,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:02:08,348 INFO L93 Difference]: Finished difference Result 255 states and 255 transitions. [2019-01-31 17:02:08,349 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2019-01-31 17:02:08,349 INFO L78 Accepts]: Start accepts. Automaton has 168 states. Word has length 249 [2019-01-31 17:02:08,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:02:08,350 INFO L225 Difference]: With dead ends: 255 [2019-01-31 17:02:08,350 INFO L226 Difference]: Without dead ends: 254 [2019-01-31 17:02:08,351 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 579 GetRequests, 330 SyntacticMatches, 66 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26301 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=13617, Invalid=20423, Unknown=0, NotChecked=0, Total=34040 [2019-01-31 17:02:08,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2019-01-31 17:02:08,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 253. [2019-01-31 17:02:08,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 253 states. [2019-01-31 17:02:08,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 253 transitions. [2019-01-31 17:02:08,357 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 253 transitions. Word has length 249 [2019-01-31 17:02:08,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:02:08,357 INFO L480 AbstractCegarLoop]: Abstraction has 253 states and 253 transitions. [2019-01-31 17:02:08,357 INFO L481 AbstractCegarLoop]: Interpolant automaton has 168 states. [2019-01-31 17:02:08,357 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 253 transitions. [2019-01-31 17:02:08,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2019-01-31 17:02:08,358 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:02:08,359 INFO L402 BasicCegarLoop]: trace histogram [84, 83, 83, 1, 1] [2019-01-31 17:02:08,359 INFO L423 AbstractCegarLoop]: === Iteration 84 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:02:08,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:02:08,359 INFO L82 PathProgramCache]: Analyzing trace with hash -542241652, now seen corresponding path program 83 times [2019-01-31 17:02:08,359 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:02:08,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:02:08,360 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:02:08,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:02:08,360 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:02:08,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:02:11,614 INFO L134 CoverageAnalysis]: Checked inductivity of 10375 backedges. 0 proven. 10375 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:02:11,614 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:02:11,615 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:02:11,615 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:02:11,615 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:02:11,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:02:11,615 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 [2019-01-31 17:02:11,624 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:02:11,625 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:02:12,057 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 84 check-sat command(s) [2019-01-31 17:02:12,057 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:02:12,065 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:02:12,067 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 [2019-01-31 17:02:12,067 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:02:12,081 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:02:12,082 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:02:16,213 INFO L134 CoverageAnalysis]: Checked inductivity of 10375 backedges. 0 proven. 10375 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:02:16,214 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:02:20,317 INFO L134 CoverageAnalysis]: Checked inductivity of 10375 backedges. 0 proven. 10375 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:02:20,336 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:02:20,336 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 184 [2019-01-31 17:02:20,336 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:02:20,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 170 states [2019-01-31 17:02:20,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 170 interpolants. [2019-01-31 17:02:20,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13719, Invalid=20691, Unknown=0, NotChecked=0, Total=34410 [2019-01-31 17:02:20,339 INFO L87 Difference]: Start difference. First operand 253 states and 253 transitions. Second operand 170 states. [2019-01-31 17:02:20,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:02:20,946 INFO L93 Difference]: Finished difference Result 258 states and 258 transitions. [2019-01-31 17:02:20,946 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2019-01-31 17:02:20,946 INFO L78 Accepts]: Start accepts. Automaton has 170 states. Word has length 252 [2019-01-31 17:02:20,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:02:20,948 INFO L225 Difference]: With dead ends: 258 [2019-01-31 17:02:20,948 INFO L226 Difference]: Without dead ends: 257 [2019-01-31 17:02:20,949 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 334 SyntacticMatches, 68 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26798 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=13719, Invalid=20691, Unknown=0, NotChecked=0, Total=34410 [2019-01-31 17:02:20,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2019-01-31 17:02:20,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 256. [2019-01-31 17:02:20,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2019-01-31 17:02:20,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 256 transitions. [2019-01-31 17:02:20,955 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 256 transitions. Word has length 252 [2019-01-31 17:02:20,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:02:20,956 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 256 transitions. [2019-01-31 17:02:20,956 INFO L481 AbstractCegarLoop]: Interpolant automaton has 170 states. [2019-01-31 17:02:20,956 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 256 transitions. [2019-01-31 17:02:20,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2019-01-31 17:02:20,957 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:02:20,957 INFO L402 BasicCegarLoop]: trace histogram [85, 84, 84, 1, 1] [2019-01-31 17:02:20,957 INFO L423 AbstractCegarLoop]: === Iteration 85 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:02:20,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:02:20,958 INFO L82 PathProgramCache]: Analyzing trace with hash -549012960, now seen corresponding path program 84 times [2019-01-31 17:02:20,958 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:02:20,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:02:20,958 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:02:20,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:02:20,959 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:02:21,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:02:24,508 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 0 proven. 10626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:02:24,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:02:24,509 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:02:24,509 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:02:24,509 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:02:24,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:02:24,509 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 [2019-01-31 17:02:24,518 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:02:24,518 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:02:24,605 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:02:24,606 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:02:24,614 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:02:24,617 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 [2019-01-31 17:02:24,617 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:02:24,628 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:02:24,628 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:02:28,563 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 0 proven. 10626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:02:28,563 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:02:32,625 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 0 proven. 10626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:02:32,644 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:02:32,645 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 185 [2019-01-31 17:02:32,645 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:02:32,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 172 states [2019-01-31 17:02:32,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2019-01-31 17:02:32,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13821, Invalid=20961, Unknown=0, NotChecked=0, Total=34782 [2019-01-31 17:02:32,649 INFO L87 Difference]: Start difference. First operand 256 states and 256 transitions. Second operand 172 states. [2019-01-31 17:02:33,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:02:33,310 INFO L93 Difference]: Finished difference Result 261 states and 261 transitions. [2019-01-31 17:02:33,310 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2019-01-31 17:02:33,310 INFO L78 Accepts]: Start accepts. Automaton has 172 states. Word has length 255 [2019-01-31 17:02:33,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:02:33,312 INFO L225 Difference]: With dead ends: 261 [2019-01-31 17:02:33,312 INFO L226 Difference]: Without dead ends: 260 [2019-01-31 17:02:33,313 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 593 GetRequests, 338 SyntacticMatches, 70 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27295 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=13821, Invalid=20961, Unknown=0, NotChecked=0, Total=34782 [2019-01-31 17:02:33,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2019-01-31 17:02:33,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 259. [2019-01-31 17:02:33,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2019-01-31 17:02:33,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 259 transitions. [2019-01-31 17:02:33,317 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 259 transitions. Word has length 255 [2019-01-31 17:02:33,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:02:33,318 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 259 transitions. [2019-01-31 17:02:33,318 INFO L481 AbstractCegarLoop]: Interpolant automaton has 172 states. [2019-01-31 17:02:33,318 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 259 transitions. [2019-01-31 17:02:33,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2019-01-31 17:02:33,319 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:02:33,319 INFO L402 BasicCegarLoop]: trace histogram [86, 85, 85, 1, 1] [2019-01-31 17:02:33,319 INFO L423 AbstractCegarLoop]: === Iteration 86 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:02:33,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:02:33,319 INFO L82 PathProgramCache]: Analyzing trace with hash -409586676, now seen corresponding path program 85 times [2019-01-31 17:02:33,319 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:02:33,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:02:33,320 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:02:33,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:02:33,320 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:02:33,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:02:37,057 INFO L134 CoverageAnalysis]: Checked inductivity of 10880 backedges. 0 proven. 10880 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:02:37,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:02:37,058 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:02:37,058 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:02:37,058 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:02:37,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:02:37,058 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 [2019-01-31 17:02:37,069 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:02:37,069 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:02:37,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:02:37,147 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:02:37,153 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 [2019-01-31 17:02:37,153 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:02:37,163 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:02:37,163 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:02:41,240 INFO L134 CoverageAnalysis]: Checked inductivity of 10880 backedges. 0 proven. 10880 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:02:41,240 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:02:45,629 INFO L134 CoverageAnalysis]: Checked inductivity of 10880 backedges. 0 proven. 10880 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:02:45,647 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:02:45,647 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86, 86] total 186 [2019-01-31 17:02:45,647 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:02:45,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 174 states [2019-01-31 17:02:45,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 174 interpolants. [2019-01-31 17:02:45,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13923, Invalid=21233, Unknown=0, NotChecked=0, Total=35156 [2019-01-31 17:02:45,650 INFO L87 Difference]: Start difference. First operand 259 states and 259 transitions. Second operand 174 states. [2019-01-31 17:02:46,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:02:46,341 INFO L93 Difference]: Finished difference Result 264 states and 264 transitions. [2019-01-31 17:02:46,341 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2019-01-31 17:02:46,341 INFO L78 Accepts]: Start accepts. Automaton has 174 states. Word has length 258 [2019-01-31 17:02:46,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:02:46,342 INFO L225 Difference]: With dead ends: 264 [2019-01-31 17:02:46,342 INFO L226 Difference]: Without dead ends: 263 [2019-01-31 17:02:46,343 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 [2019-01-31 17:02:46,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2019-01-31 17:02:46,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 262. [2019-01-31 17:02:46,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2019-01-31 17:02:46,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 262 transitions. [2019-01-31 17:02:46,350 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 262 transitions. Word has length 258 [2019-01-31 17:02:46,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:02:46,350 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 262 transitions. [2019-01-31 17:02:46,350 INFO L481 AbstractCegarLoop]: Interpolant automaton has 174 states. [2019-01-31 17:02:46,350 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 262 transitions. [2019-01-31 17:02:46,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2019-01-31 17:02:46,351 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:02:46,352 INFO L402 BasicCegarLoop]: trace histogram [87, 86, 86, 1, 1] [2019-01-31 17:02:46,352 INFO L423 AbstractCegarLoop]: === Iteration 87 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:02:46,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:02:46,352 INFO L82 PathProgramCache]: Analyzing trace with hash 5464736, now seen corresponding path program 86 times [2019-01-31 17:02:46,352 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:02:46,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:02:46,353 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:02:46,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:02:46,353 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:02:46,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:02:49,964 INFO L134 CoverageAnalysis]: Checked inductivity of 11137 backedges. 0 proven. 11137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:02:49,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:02:49,965 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:02:49,965 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:02:49,965 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:02:49,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:02:49,965 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 [2019-01-31 17:02:49,974 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:02:49,974 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:02:50,438 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 87 check-sat command(s) [2019-01-31 17:02:50,439 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:02:50,448 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:02:50,454 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 [2019-01-31 17:02:50,454 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:02:50,472 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:02:50,472 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:02:54,800 INFO L134 CoverageAnalysis]: Checked inductivity of 11137 backedges. 0 proven. 11137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:02:54,800 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:02:58,938 INFO L134 CoverageAnalysis]: Checked inductivity of 11137 backedges. 0 proven. 11137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:02:58,956 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:02:58,956 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 187 [2019-01-31 17:02:58,957 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:02:58,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 176 states [2019-01-31 17:02:58,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2019-01-31 17:02:58,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14025, Invalid=21507, Unknown=0, NotChecked=0, Total=35532 [2019-01-31 17:02:58,960 INFO L87 Difference]: Start difference. First operand 262 states and 262 transitions. Second operand 176 states. [2019-01-31 17:02:59,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:02:59,801 INFO L93 Difference]: Finished difference Result 267 states and 267 transitions. [2019-01-31 17:02:59,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2019-01-31 17:02:59,801 INFO L78 Accepts]: Start accepts. Automaton has 176 states. Word has length 261 [2019-01-31 17:02:59,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:02:59,802 INFO L225 Difference]: With dead ends: 267 [2019-01-31 17:02:59,802 INFO L226 Difference]: Without dead ends: 266 [2019-01-31 17:02:59,803 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 607 GetRequests, 346 SyntacticMatches, 74 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28289 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=14025, Invalid=21507, Unknown=0, NotChecked=0, Total=35532 [2019-01-31 17:02:59,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2019-01-31 17:02:59,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 265. [2019-01-31 17:02:59,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 265 states. [2019-01-31 17:02:59,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 265 transitions. [2019-01-31 17:02:59,808 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 265 transitions. Word has length 261 [2019-01-31 17:02:59,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:02:59,809 INFO L480 AbstractCegarLoop]: Abstraction has 265 states and 265 transitions. [2019-01-31 17:02:59,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has 176 states. [2019-01-31 17:02:59,809 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 265 transitions. [2019-01-31 17:02:59,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2019-01-31 17:02:59,810 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:02:59,810 INFO L402 BasicCegarLoop]: trace histogram [88, 87, 87, 1, 1] [2019-01-31 17:02:59,811 INFO L423 AbstractCegarLoop]: === Iteration 88 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:02:59,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:02:59,811 INFO L82 PathProgramCache]: Analyzing trace with hash -408765556, now seen corresponding path program 87 times [2019-01-31 17:02:59,811 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:02:59,812 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:02:59,812 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:02:59,812 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:02:59,812 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:02:59,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:03:03,287 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 0 proven. 11397 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:03:03,287 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:03:03,287 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:03:03,287 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:03:03,287 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:03:03,287 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:03:03,287 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 [2019-01-31 17:03:03,296 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:03:03,296 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:03:03,382 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:03:03,382 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:03:03,391 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:03:03,397 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 [2019-01-31 17:03:03,397 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:03:03,404 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:03:03,404 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:03:07,859 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 0 proven. 11397 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:03:07,859 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:03:12,165 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 0 proven. 11397 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:03:12,185 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:03:12,185 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88, 88] total 188 [2019-01-31 17:03:12,185 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:03:12,186 INFO L459 AbstractCegarLoop]: Interpolant automaton has 178 states [2019-01-31 17:03:12,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 178 interpolants. [2019-01-31 17:03:12,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14127, Invalid=21783, Unknown=0, NotChecked=0, Total=35910 [2019-01-31 17:03:12,188 INFO L87 Difference]: Start difference. First operand 265 states and 265 transitions. Second operand 178 states. [2019-01-31 17:03:12,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:03:12,834 INFO L93 Difference]: Finished difference Result 270 states and 270 transitions. [2019-01-31 17:03:12,835 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2019-01-31 17:03:12,835 INFO L78 Accepts]: Start accepts. Automaton has 178 states. Word has length 264 [2019-01-31 17:03:12,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:03:12,837 INFO L225 Difference]: With dead ends: 270 [2019-01-31 17:03:12,837 INFO L226 Difference]: Without dead ends: 269 [2019-01-31 17:03:12,838 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 614 GetRequests, 350 SyntacticMatches, 76 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28786 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=14127, Invalid=21783, Unknown=0, NotChecked=0, Total=35910 [2019-01-31 17:03:12,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2019-01-31 17:03:12,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 268. [2019-01-31 17:03:12,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2019-01-31 17:03:12,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 268 transitions. [2019-01-31 17:03:12,843 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 268 transitions. Word has length 264 [2019-01-31 17:03:12,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:03:12,843 INFO L480 AbstractCegarLoop]: Abstraction has 268 states and 268 transitions. [2019-01-31 17:03:12,843 INFO L481 AbstractCegarLoop]: Interpolant automaton has 178 states. [2019-01-31 17:03:12,843 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 268 transitions. [2019-01-31 17:03:12,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2019-01-31 17:03:12,844 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:03:12,844 INFO L402 BasicCegarLoop]: trace histogram [89, 88, 88, 1, 1] [2019-01-31 17:03:12,844 INFO L423 AbstractCegarLoop]: === Iteration 89 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:03:12,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:03:12,844 INFO L82 PathProgramCache]: Analyzing trace with hash -1302353120, now seen corresponding path program 88 times [2019-01-31 17:03:12,844 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:03:12,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:03:12,845 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:03:12,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:03:12,845 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:03:12,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:03:16,703 INFO L134 CoverageAnalysis]: Checked inductivity of 11660 backedges. 0 proven. 11660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:03:16,704 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:03:16,704 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:03:16,704 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:03:16,704 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:03:16,704 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:03:16,704 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 [2019-01-31 17:03:16,712 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:03:16,713 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:03:16,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:03:16,794 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:03:16,796 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 [2019-01-31 17:03:16,797 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:03:16,807 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:03:16,807 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:03:21,430 INFO L134 CoverageAnalysis]: Checked inductivity of 11660 backedges. 0 proven. 11660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:03:21,430 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:03:25,886 INFO L134 CoverageAnalysis]: Checked inductivity of 11660 backedges. 0 proven. 11660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:03:25,906 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:03:25,906 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 189 [2019-01-31 17:03:25,906 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:03:25,907 INFO L459 AbstractCegarLoop]: Interpolant automaton has 180 states [2019-01-31 17:03:25,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 180 interpolants. [2019-01-31 17:03:25,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14229, Invalid=22061, Unknown=0, NotChecked=0, Total=36290 [2019-01-31 17:03:25,909 INFO L87 Difference]: Start difference. First operand 268 states and 268 transitions. Second operand 180 states. [2019-01-31 17:03:26,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:03:26,686 INFO L93 Difference]: Finished difference Result 273 states and 273 transitions. [2019-01-31 17:03:26,686 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2019-01-31 17:03:26,686 INFO L78 Accepts]: Start accepts. Automaton has 180 states. Word has length 267 [2019-01-31 17:03:26,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:03:26,688 INFO L225 Difference]: With dead ends: 273 [2019-01-31 17:03:26,688 INFO L226 Difference]: Without dead ends: 272 [2019-01-31 17:03:26,688 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 621 GetRequests, 354 SyntacticMatches, 78 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29283 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=14229, Invalid=22061, Unknown=0, NotChecked=0, Total=36290 [2019-01-31 17:03:26,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2019-01-31 17:03:26,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 271. [2019-01-31 17:03:26,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 271 states. [2019-01-31 17:03:26,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 271 transitions. [2019-01-31 17:03:26,693 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 271 transitions. Word has length 267 [2019-01-31 17:03:26,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:03:26,693 INFO L480 AbstractCegarLoop]: Abstraction has 271 states and 271 transitions. [2019-01-31 17:03:26,693 INFO L481 AbstractCegarLoop]: Interpolant automaton has 180 states. [2019-01-31 17:03:26,693 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 271 transitions. [2019-01-31 17:03:26,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2019-01-31 17:03:26,694 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:03:26,694 INFO L402 BasicCegarLoop]: trace histogram [90, 89, 89, 1, 1] [2019-01-31 17:03:26,694 INFO L423 AbstractCegarLoop]: === Iteration 90 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:03:26,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:03:26,695 INFO L82 PathProgramCache]: Analyzing trace with hash -1962171636, now seen corresponding path program 89 times [2019-01-31 17:03:26,695 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:03:26,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:03:26,695 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:03:26,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:03:26,695 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:03:26,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:03:30,429 INFO L134 CoverageAnalysis]: Checked inductivity of 11926 backedges. 0 proven. 11926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:03:30,429 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:03:30,429 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:03:30,429 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:03:30,430 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:03:30,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:03:30,430 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 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 [2019-01-31 17:03:30,437 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:03:30,437 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:03:30,950 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 90 check-sat command(s) [2019-01-31 17:03:30,951 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:03:30,959 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:03:30,965 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 [2019-01-31 17:03:30,965 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:03:30,976 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:03:30,976 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:03:35,383 INFO L134 CoverageAnalysis]: Checked inductivity of 11926 backedges. 0 proven. 11926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:03:35,384 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:03:39,740 INFO L134 CoverageAnalysis]: Checked inductivity of 11926 backedges. 0 proven. 11926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:03:39,760 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:03:39,760 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90, 90] total 190 [2019-01-31 17:03:39,761 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:03:39,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 182 states [2019-01-31 17:03:39,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 182 interpolants. [2019-01-31 17:03:39,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14331, Invalid=22341, Unknown=0, NotChecked=0, Total=36672 [2019-01-31 17:03:39,763 INFO L87 Difference]: Start difference. First operand 271 states and 271 transitions. Second operand 182 states. [2019-01-31 17:03:40,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:03:40,524 INFO L93 Difference]: Finished difference Result 276 states and 276 transitions. [2019-01-31 17:03:40,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2019-01-31 17:03:40,524 INFO L78 Accepts]: Start accepts. Automaton has 182 states. Word has length 270 [2019-01-31 17:03:40,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:03:40,526 INFO L225 Difference]: With dead ends: 276 [2019-01-31 17:03:40,526 INFO L226 Difference]: Without dead ends: 275 [2019-01-31 17:03:40,527 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 628 GetRequests, 358 SyntacticMatches, 80 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29780 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=14331, Invalid=22341, Unknown=0, NotChecked=0, Total=36672 [2019-01-31 17:03:40,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2019-01-31 17:03:40,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 274. [2019-01-31 17:03:40,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2019-01-31 17:03:40,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 274 transitions. [2019-01-31 17:03:40,533 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 274 transitions. Word has length 270 [2019-01-31 17:03:40,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:03:40,533 INFO L480 AbstractCegarLoop]: Abstraction has 274 states and 274 transitions. [2019-01-31 17:03:40,533 INFO L481 AbstractCegarLoop]: Interpolant automaton has 182 states. [2019-01-31 17:03:40,533 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 274 transitions. [2019-01-31 17:03:40,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2019-01-31 17:03:40,534 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:03:40,534 INFO L402 BasicCegarLoop]: trace histogram [91, 90, 90, 1, 1] [2019-01-31 17:03:40,534 INFO L423 AbstractCegarLoop]: === Iteration 91 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:03:40,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:03:40,534 INFO L82 PathProgramCache]: Analyzing trace with hash -550268000, now seen corresponding path program 90 times [2019-01-31 17:03:40,534 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:03:40,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:03:40,535 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:03:40,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:03:40,535 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:03:40,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:03:44,265 INFO L134 CoverageAnalysis]: Checked inductivity of 12195 backedges. 0 proven. 12195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:03:44,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:03:44,266 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:03:44,266 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:03:44,266 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:03:44,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:03:44,266 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 [2019-01-31 17:03:44,274 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:03:44,274 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:03:44,367 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:03:44,367 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:03:44,377 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:03:44,380 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 [2019-01-31 17:03:44,380 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:03:44,392 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:03:44,392 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:03:49,196 INFO L134 CoverageAnalysis]: Checked inductivity of 12195 backedges. 0 proven. 12195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:03:49,196 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:03:53,569 INFO L134 CoverageAnalysis]: Checked inductivity of 12195 backedges. 0 proven. 12195 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:03:53,587 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:03:53,588 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 191 [2019-01-31 17:03:53,588 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:03:53,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 184 states [2019-01-31 17:03:53,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 184 interpolants. [2019-01-31 17:03:53,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14433, Invalid=22623, Unknown=0, NotChecked=0, Total=37056 [2019-01-31 17:03:53,591 INFO L87 Difference]: Start difference. First operand 274 states and 274 transitions. Second operand 184 states. [2019-01-31 17:03:54,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:03:54,330 INFO L93 Difference]: Finished difference Result 279 states and 279 transitions. [2019-01-31 17:03:54,330 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2019-01-31 17:03:54,330 INFO L78 Accepts]: Start accepts. Automaton has 184 states. Word has length 273 [2019-01-31 17:03:54,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:03:54,332 INFO L225 Difference]: With dead ends: 279 [2019-01-31 17:03:54,332 INFO L226 Difference]: Without dead ends: 278 [2019-01-31 17:03:54,333 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 635 GetRequests, 362 SyntacticMatches, 82 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30277 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=14433, Invalid=22623, Unknown=0, NotChecked=0, Total=37056 [2019-01-31 17:03:54,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2019-01-31 17:03:54,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 277. [2019-01-31 17:03:54,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2019-01-31 17:03:54,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 277 transitions. [2019-01-31 17:03:54,337 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 277 transitions. Word has length 273 [2019-01-31 17:03:54,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:03:54,338 INFO L480 AbstractCegarLoop]: Abstraction has 277 states and 277 transitions. [2019-01-31 17:03:54,338 INFO L481 AbstractCegarLoop]: Interpolant automaton has 184 states. [2019-01-31 17:03:54,338 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 277 transitions. [2019-01-31 17:03:54,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2019-01-31 17:03:54,339 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:03:54,339 INFO L402 BasicCegarLoop]: trace histogram [92, 91, 91, 1, 1] [2019-01-31 17:03:54,339 INFO L423 AbstractCegarLoop]: === Iteration 92 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:03:54,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:03:54,339 INFO L82 PathProgramCache]: Analyzing trace with hash 856222348, now seen corresponding path program 91 times [2019-01-31 17:03:54,339 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:03:54,340 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:03:54,340 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:03:54,340 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:03:54,340 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:03:54,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:03:58,411 INFO L134 CoverageAnalysis]: Checked inductivity of 12467 backedges. 0 proven. 12467 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:03:58,411 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:03:58,411 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:03:58,411 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:03:58,411 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:03:58,412 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:03:58,412 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 [2019-01-31 17:03:58,422 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:03:58,422 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:03:58,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:03:58,504 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:03:58,506 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 [2019-01-31 17:03:58,506 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:03:58,514 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:03:58,515 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:04:03,398 INFO L134 CoverageAnalysis]: Checked inductivity of 12467 backedges. 0 proven. 12467 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:04:03,398 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:04:07,797 INFO L134 CoverageAnalysis]: Checked inductivity of 12467 backedges. 0 proven. 12467 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:04:07,816 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:04:07,816 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92, 92] total 192 [2019-01-31 17:04:07,816 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:04:07,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 186 states [2019-01-31 17:04:07,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 186 interpolants. [2019-01-31 17:04:07,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14535, Invalid=22907, Unknown=0, NotChecked=0, Total=37442 [2019-01-31 17:04:07,819 INFO L87 Difference]: Start difference. First operand 277 states and 277 transitions. Second operand 186 states. [2019-01-31 17:04:08,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:04:08,568 INFO L93 Difference]: Finished difference Result 282 states and 282 transitions. [2019-01-31 17:04:08,572 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2019-01-31 17:04:08,572 INFO L78 Accepts]: Start accepts. Automaton has 186 states. Word has length 276 [2019-01-31 17:04:08,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:04:08,574 INFO L225 Difference]: With dead ends: 282 [2019-01-31 17:04:08,574 INFO L226 Difference]: Without dead ends: 281 [2019-01-31 17:04:08,575 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 [2019-01-31 17:04:08,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2019-01-31 17:04:08,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 280. [2019-01-31 17:04:08,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2019-01-31 17:04:08,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 280 transitions. [2019-01-31 17:04:08,580 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 280 transitions. Word has length 276 [2019-01-31 17:04:08,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:04:08,580 INFO L480 AbstractCegarLoop]: Abstraction has 280 states and 280 transitions. [2019-01-31 17:04:08,581 INFO L481 AbstractCegarLoop]: Interpolant automaton has 186 states. [2019-01-31 17:04:08,581 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 280 transitions. [2019-01-31 17:04:08,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2019-01-31 17:04:08,582 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:04:08,582 INFO L402 BasicCegarLoop]: trace histogram [93, 92, 92, 1, 1] [2019-01-31 17:04:08,582 INFO L423 AbstractCegarLoop]: === Iteration 93 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:04:08,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:04:08,582 INFO L82 PathProgramCache]: Analyzing trace with hash -90760160, now seen corresponding path program 92 times [2019-01-31 17:04:08,583 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:04:08,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:04:08,583 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:04:08,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:04:08,583 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:04:08,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:04:12,761 INFO L134 CoverageAnalysis]: Checked inductivity of 12742 backedges. 0 proven. 12742 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:04:12,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:04:12,761 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:04:12,761 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:04:12,761 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:04:12,762 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:04:12,762 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 [2019-01-31 17:04:12,770 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:04:12,770 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:04:13,320 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 93 check-sat command(s) [2019-01-31 17:04:13,321 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:04:13,330 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:04:13,332 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 [2019-01-31 17:04:13,332 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:04:13,344 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:04:13,344 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:04:18,415 INFO L134 CoverageAnalysis]: Checked inductivity of 12742 backedges. 0 proven. 12742 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:04:18,415 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:04:22,805 INFO L134 CoverageAnalysis]: Checked inductivity of 12742 backedges. 0 proven. 12742 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:04:22,824 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:04:22,824 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 193 [2019-01-31 17:04:22,825 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:04:22,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 188 states [2019-01-31 17:04:22,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 188 interpolants. [2019-01-31 17:04:22,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14637, Invalid=23193, Unknown=0, NotChecked=0, Total=37830 [2019-01-31 17:04:22,827 INFO L87 Difference]: Start difference. First operand 280 states and 280 transitions. Second operand 188 states. [2019-01-31 17:04:23,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:04:23,639 INFO L93 Difference]: Finished difference Result 285 states and 285 transitions. [2019-01-31 17:04:23,639 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2019-01-31 17:04:23,639 INFO L78 Accepts]: Start accepts. Automaton has 188 states. Word has length 279 [2019-01-31 17:04:23,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:04:23,640 INFO L225 Difference]: With dead ends: 285 [2019-01-31 17:04:23,640 INFO L226 Difference]: Without dead ends: 284 [2019-01-31 17:04:23,642 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 649 GetRequests, 370 SyntacticMatches, 86 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31271 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=14637, Invalid=23193, Unknown=0, NotChecked=0, Total=37830 [2019-01-31 17:04:23,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2019-01-31 17:04:23,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 283. [2019-01-31 17:04:23,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 283 states. [2019-01-31 17:04:23,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 283 transitions. [2019-01-31 17:04:23,648 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 283 transitions. Word has length 279 [2019-01-31 17:04:23,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:04:23,648 INFO L480 AbstractCegarLoop]: Abstraction has 283 states and 283 transitions. [2019-01-31 17:04:23,648 INFO L481 AbstractCegarLoop]: Interpolant automaton has 188 states. [2019-01-31 17:04:23,648 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 283 transitions. [2019-01-31 17:04:23,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 283 [2019-01-31 17:04:23,649 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:04:23,649 INFO L402 BasicCegarLoop]: trace histogram [94, 93, 93, 1, 1] [2019-01-31 17:04:23,649 INFO L423 AbstractCegarLoop]: === Iteration 94 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:04:23,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:04:23,650 INFO L82 PathProgramCache]: Analyzing trace with hash 1993511436, now seen corresponding path program 93 times [2019-01-31 17:04:23,650 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:04:23,650 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:04:23,650 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:04:23,650 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:04:23,650 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:04:23,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:04:27,776 INFO L134 CoverageAnalysis]: Checked inductivity of 13020 backedges. 0 proven. 13020 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:04:27,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:04:27,776 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:04:27,777 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:04:27,777 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:04:27,777 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:04:27,777 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 [2019-01-31 17:04:27,785 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:04:27,786 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:04:27,878 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:04:27,878 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:04:27,888 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:04:27,900 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 [2019-01-31 17:04:27,900 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:04:27,907 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:04:27,908 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:04:32,893 INFO L134 CoverageAnalysis]: Checked inductivity of 13020 backedges. 0 proven. 13020 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:04:32,893 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:04:37,382 INFO L134 CoverageAnalysis]: Checked inductivity of 13020 backedges. 0 proven. 13020 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:04:37,402 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:04:37,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94, 94] total 194 [2019-01-31 17:04:37,402 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:04:37,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 190 states [2019-01-31 17:04:37,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2019-01-31 17:04:37,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14739, Invalid=23481, Unknown=0, NotChecked=0, Total=38220 [2019-01-31 17:04:37,405 INFO L87 Difference]: Start difference. First operand 283 states and 283 transitions. Second operand 190 states. [2019-01-31 17:04:38,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:04:38,204 INFO L93 Difference]: Finished difference Result 288 states and 288 transitions. [2019-01-31 17:04:38,204 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2019-01-31 17:04:38,205 INFO L78 Accepts]: Start accepts. Automaton has 190 states. Word has length 282 [2019-01-31 17:04:38,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:04:38,206 INFO L225 Difference]: With dead ends: 288 [2019-01-31 17:04:38,206 INFO L226 Difference]: Without dead ends: 287 [2019-01-31 17:04:38,207 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 656 GetRequests, 374 SyntacticMatches, 88 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31768 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=14739, Invalid=23481, Unknown=0, NotChecked=0, Total=38220 [2019-01-31 17:04:38,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2019-01-31 17:04:38,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 286. [2019-01-31 17:04:38,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2019-01-31 17:04:38,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 286 transitions. [2019-01-31 17:04:38,211 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 286 transitions. Word has length 282 [2019-01-31 17:04:38,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:04:38,212 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 286 transitions. [2019-01-31 17:04:38,212 INFO L481 AbstractCegarLoop]: Interpolant automaton has 190 states. [2019-01-31 17:04:38,212 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 286 transitions. [2019-01-31 17:04:38,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2019-01-31 17:04:38,213 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:04:38,213 INFO L402 BasicCegarLoop]: trace histogram [95, 94, 94, 1, 1] [2019-01-31 17:04:38,213 INFO L423 AbstractCegarLoop]: === Iteration 95 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:04:38,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:04:38,213 INFO L82 PathProgramCache]: Analyzing trace with hash -2108537696, now seen corresponding path program 94 times [2019-01-31 17:04:38,213 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:04:38,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:04:38,214 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:04:38,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:04:38,214 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:04:38,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:04:42,515 INFO L134 CoverageAnalysis]: Checked inductivity of 13301 backedges. 0 proven. 13301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:04:42,515 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:04:42,515 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:04:42,515 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:04:42,515 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:04:42,515 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:04:42,515 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 [2019-01-31 17:04:42,524 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:04:42,524 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:04:42,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:04:42,610 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:04:42,612 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 [2019-01-31 17:04:42,612 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:04:42,626 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:04:42,626 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:04:47,840 INFO L134 CoverageAnalysis]: Checked inductivity of 13301 backedges. 0 proven. 13301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:04:47,840 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:04:51,971 INFO L134 CoverageAnalysis]: Checked inductivity of 13301 backedges. 0 proven. 13301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:04:51,990 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:04:51,990 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 195 [2019-01-31 17:04:51,990 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:04:51,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 192 states [2019-01-31 17:04:51,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2019-01-31 17:04:51,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14841, Invalid=23771, Unknown=0, NotChecked=0, Total=38612 [2019-01-31 17:04:51,993 INFO L87 Difference]: Start difference. First operand 286 states and 286 transitions. Second operand 192 states. [2019-01-31 17:04:52,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:04:52,758 INFO L93 Difference]: Finished difference Result 291 states and 291 transitions. [2019-01-31 17:04:52,758 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2019-01-31 17:04:52,758 INFO L78 Accepts]: Start accepts. Automaton has 192 states. Word has length 285 [2019-01-31 17:04:52,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:04:52,760 INFO L225 Difference]: With dead ends: 291 [2019-01-31 17:04:52,760 INFO L226 Difference]: Without dead ends: 290 [2019-01-31 17:04:52,762 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 663 GetRequests, 378 SyntacticMatches, 90 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32265 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=14841, Invalid=23771, Unknown=0, NotChecked=0, Total=38612 [2019-01-31 17:04:52,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2019-01-31 17:04:52,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 289. [2019-01-31 17:04:52,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2019-01-31 17:04:52,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 289 transitions. [2019-01-31 17:04:52,767 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 289 transitions. Word has length 285 [2019-01-31 17:04:52,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:04:52,767 INFO L480 AbstractCegarLoop]: Abstraction has 289 states and 289 transitions. [2019-01-31 17:04:52,767 INFO L481 AbstractCegarLoop]: Interpolant automaton has 192 states. [2019-01-31 17:04:52,767 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 289 transitions. [2019-01-31 17:04:52,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2019-01-31 17:04:52,768 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:04:52,768 INFO L402 BasicCegarLoop]: trace histogram [96, 95, 95, 1, 1] [2019-01-31 17:04:52,768 INFO L423 AbstractCegarLoop]: === Iteration 96 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:04:52,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:04:52,768 INFO L82 PathProgramCache]: Analyzing trace with hash -1549756020, now seen corresponding path program 95 times [2019-01-31 17:04:52,769 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:04:52,769 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:04:52,769 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:04:52,769 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:04:52,769 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:04:52,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:04:56,876 INFO L134 CoverageAnalysis]: Checked inductivity of 13585 backedges. 0 proven. 13585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:04:56,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:04:56,877 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:04:56,877 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:04:56,877 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:04:56,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:04:56,877 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 [2019-01-31 17:04:56,885 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:04:56,886 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:04:57,483 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 96 check-sat command(s) [2019-01-31 17:04:57,483 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:04:57,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:04:57,495 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 [2019-01-31 17:04:57,495 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:04:57,504 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:04:57,504 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:05:02,611 INFO L134 CoverageAnalysis]: Checked inductivity of 13585 backedges. 0 proven. 13585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:05:02,612 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:05:06,769 INFO L134 CoverageAnalysis]: Checked inductivity of 13585 backedges. 0 proven. 13585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:05:06,788 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:05:06,788 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 196 [2019-01-31 17:05:06,788 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:05:06,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 194 states [2019-01-31 17:05:06,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2019-01-31 17:05:06,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14943, Invalid=24063, Unknown=0, NotChecked=0, Total=39006 [2019-01-31 17:05:06,792 INFO L87 Difference]: Start difference. First operand 289 states and 289 transitions. Second operand 194 states. [2019-01-31 17:05:07,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:05:07,657 INFO L93 Difference]: Finished difference Result 294 states and 294 transitions. [2019-01-31 17:05:07,658 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2019-01-31 17:05:07,658 INFO L78 Accepts]: Start accepts. Automaton has 194 states. Word has length 288 [2019-01-31 17:05:07,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:05:07,660 INFO L225 Difference]: With dead ends: 294 [2019-01-31 17:05:07,660 INFO L226 Difference]: Without dead ends: 293 [2019-01-31 17:05:07,661 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 670 GetRequests, 382 SyntacticMatches, 92 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32762 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=14943, Invalid=24063, Unknown=0, NotChecked=0, Total=39006 [2019-01-31 17:05:07,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2019-01-31 17:05:07,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 292. [2019-01-31 17:05:07,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2019-01-31 17:05:07,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 292 transitions. [2019-01-31 17:05:07,667 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 292 transitions. Word has length 288 [2019-01-31 17:05:07,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:05:07,667 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 292 transitions. [2019-01-31 17:05:07,667 INFO L481 AbstractCegarLoop]: Interpolant automaton has 194 states. [2019-01-31 17:05:07,667 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 292 transitions. [2019-01-31 17:05:07,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2019-01-31 17:05:07,668 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:05:07,669 INFO L402 BasicCegarLoop]: trace histogram [97, 96, 96, 1, 1] [2019-01-31 17:05:07,669 INFO L423 AbstractCegarLoop]: === Iteration 97 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:05:07,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:05:07,669 INFO L82 PathProgramCache]: Analyzing trace with hash 2116881696, now seen corresponding path program 96 times [2019-01-31 17:05:07,669 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:05:07,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:05:07,670 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:05:07,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:05:07,670 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:05:07,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:05:11,880 INFO L134 CoverageAnalysis]: Checked inductivity of 13872 backedges. 0 proven. 13872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:05:11,880 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:05:11,880 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:05:11,880 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:05:11,880 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:05:11,880 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:05:11,881 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 [2019-01-31 17:05:11,889 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:05:11,889 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:05:11,993 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:05:11,993 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:05:12,002 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:05:12,005 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 [2019-01-31 17:05:12,005 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:05:12,014 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:05:12,015 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:05:17,353 INFO L134 CoverageAnalysis]: Checked inductivity of 13872 backedges. 0 proven. 13872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:05:17,353 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:05:21,848 INFO L134 CoverageAnalysis]: Checked inductivity of 13872 backedges. 0 proven. 13872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:05:21,867 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:05:21,867 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 197 [2019-01-31 17:05:21,867 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:05:21,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 196 states [2019-01-31 17:05:21,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 196 interpolants. [2019-01-31 17:05:21,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15045, Invalid=24357, Unknown=0, NotChecked=0, Total=39402 [2019-01-31 17:05:21,871 INFO L87 Difference]: Start difference. First operand 292 states and 292 transitions. Second operand 196 states. [2019-01-31 17:05:22,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:05:22,560 INFO L93 Difference]: Finished difference Result 297 states and 297 transitions. [2019-01-31 17:05:22,561 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2019-01-31 17:05:22,561 INFO L78 Accepts]: Start accepts. Automaton has 196 states. Word has length 291 [2019-01-31 17:05:22,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:05:22,563 INFO L225 Difference]: With dead ends: 297 [2019-01-31 17:05:22,563 INFO L226 Difference]: Without dead ends: 296 [2019-01-31 17:05:22,564 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 677 GetRequests, 386 SyntacticMatches, 94 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33259 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=15045, Invalid=24357, Unknown=0, NotChecked=0, Total=39402 [2019-01-31 17:05:22,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2019-01-31 17:05:22,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 295. [2019-01-31 17:05:22,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 295 states. [2019-01-31 17:05:22,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 295 transitions. [2019-01-31 17:05:22,569 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 295 transitions. Word has length 291 [2019-01-31 17:05:22,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:05:22,569 INFO L480 AbstractCegarLoop]: Abstraction has 295 states and 295 transitions. [2019-01-31 17:05:22,569 INFO L481 AbstractCegarLoop]: Interpolant automaton has 196 states. [2019-01-31 17:05:22,569 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 295 transitions. [2019-01-31 17:05:22,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2019-01-31 17:05:22,570 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:05:22,570 INFO L402 BasicCegarLoop]: trace histogram [98, 97, 97, 1, 1] [2019-01-31 17:05:22,571 INFO L423 AbstractCegarLoop]: === Iteration 98 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:05:22,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:05:22,571 INFO L82 PathProgramCache]: Analyzing trace with hash 1017839884, now seen corresponding path program 97 times [2019-01-31 17:05:22,571 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:05:22,571 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:05:22,571 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:05:22,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:05:22,572 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:05:22,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:05:27,126 INFO L134 CoverageAnalysis]: Checked inductivity of 14162 backedges. 0 proven. 14162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:05:27,127 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:05:27,127 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:05:27,127 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:05:27,127 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:05:27,127 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:05:27,127 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 [2019-01-31 17:05:27,136 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:05:27,136 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:05:27,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:05:27,227 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:05:27,233 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 [2019-01-31 17:05:27,234 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:05:27,245 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:05:27,245 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:05:32,700 INFO L134 CoverageAnalysis]: Checked inductivity of 14162 backedges. 0 proven. 14162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:05:32,700 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:05:37,170 INFO L134 CoverageAnalysis]: Checked inductivity of 14162 backedges. 0 proven. 14162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:05:37,188 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:05:37,188 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98, 98] total 198 [2019-01-31 17:05:37,188 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:05:37,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 198 states [2019-01-31 17:05:37,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 198 interpolants. [2019-01-31 17:05:37,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15147, Invalid=24653, Unknown=0, NotChecked=0, Total=39800 [2019-01-31 17:05:37,191 INFO L87 Difference]: Start difference. First operand 295 states and 295 transitions. Second operand 198 states. [2019-01-31 17:05:37,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:05:37,988 INFO L93 Difference]: Finished difference Result 300 states and 300 transitions. [2019-01-31 17:05:37,989 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2019-01-31 17:05:37,989 INFO L78 Accepts]: Start accepts. Automaton has 198 states. Word has length 294 [2019-01-31 17:05:37,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:05:37,990 INFO L225 Difference]: With dead ends: 300 [2019-01-31 17:05:37,990 INFO L226 Difference]: Without dead ends: 299 [2019-01-31 17:05:37,991 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 390 SyntacticMatches, 96 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33756 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=15147, Invalid=24653, Unknown=0, NotChecked=0, Total=39800 [2019-01-31 17:05:37,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2019-01-31 17:05:37,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 298. [2019-01-31 17:05:37,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2019-01-31 17:05:37,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 298 transitions. [2019-01-31 17:05:37,997 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 298 transitions. Word has length 294 [2019-01-31 17:05:37,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:05:37,997 INFO L480 AbstractCegarLoop]: Abstraction has 298 states and 298 transitions. [2019-01-31 17:05:37,997 INFO L481 AbstractCegarLoop]: Interpolant automaton has 198 states. [2019-01-31 17:05:37,997 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 298 transitions. [2019-01-31 17:05:37,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2019-01-31 17:05:37,998 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:05:37,998 INFO L402 BasicCegarLoop]: trace histogram [99, 98, 98, 1, 1] [2019-01-31 17:05:37,999 INFO L423 AbstractCegarLoop]: === Iteration 99 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:05:37,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:05:37,999 INFO L82 PathProgramCache]: Analyzing trace with hash -1084000, now seen corresponding path program 98 times [2019-01-31 17:05:37,999 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:05:38,000 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:05:38,000 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:05:38,000 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:05:38,000 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:05:38,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:05:42,552 INFO L134 CoverageAnalysis]: Checked inductivity of 14455 backedges. 0 proven. 14455 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:05:42,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:05:42,553 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:05:42,553 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:05:42,553 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:05:42,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:05:42,553 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 [2019-01-31 17:05:42,562 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:05:42,562 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:05:43,191 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 99 check-sat command(s) [2019-01-31 17:05:43,191 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:05:43,200 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:05:43,202 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 [2019-01-31 17:05:43,203 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:05:43,222 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:05:43,223 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:05:48,917 INFO L134 CoverageAnalysis]: Checked inductivity of 14455 backedges. 0 proven. 14455 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:05:48,917 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:05:53,157 INFO L134 CoverageAnalysis]: Checked inductivity of 14455 backedges. 0 proven. 14455 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:05:53,177 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:05:53,177 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 199 [2019-01-31 17:05:53,177 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:05:53,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 200 states [2019-01-31 17:05:53,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 200 interpolants. [2019-01-31 17:05:53,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15249, Invalid=24951, Unknown=0, NotChecked=0, Total=40200 [2019-01-31 17:05:53,180 INFO L87 Difference]: Start difference. First operand 298 states and 298 transitions. Second operand 200 states. [2019-01-31 17:05:54,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:05:54,152 INFO L93 Difference]: Finished difference Result 303 states and 303 transitions. [2019-01-31 17:05:54,152 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2019-01-31 17:05:54,152 INFO L78 Accepts]: Start accepts. Automaton has 200 states. Word has length 297 [2019-01-31 17:05:54,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:05:54,154 INFO L225 Difference]: With dead ends: 303 [2019-01-31 17:05:54,154 INFO L226 Difference]: Without dead ends: 302 [2019-01-31 17:05:54,155 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 [2019-01-31 17:05:54,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2019-01-31 17:05:54,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 301. [2019-01-31 17:05:54,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 301 states. [2019-01-31 17:05:54,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 301 transitions. [2019-01-31 17:05:54,161 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 301 transitions. Word has length 297 [2019-01-31 17:05:54,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:05:54,162 INFO L480 AbstractCegarLoop]: Abstraction has 301 states and 301 transitions. [2019-01-31 17:05:54,162 INFO L481 AbstractCegarLoop]: Interpolant automaton has 200 states. [2019-01-31 17:05:54,162 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 301 transitions. [2019-01-31 17:05:54,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2019-01-31 17:05:54,163 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:05:54,164 INFO L402 BasicCegarLoop]: trace histogram [100, 99, 99, 1, 1] [2019-01-31 17:05:54,164 INFO L423 AbstractCegarLoop]: === Iteration 100 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:05:54,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:05:54,164 INFO L82 PathProgramCache]: Analyzing trace with hash 2066335884, now seen corresponding path program 99 times [2019-01-31 17:05:54,164 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:05:54,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:05:54,165 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:05:54,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:05:54,165 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:05:54,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:05:59,097 INFO L134 CoverageAnalysis]: Checked inductivity of 14751 backedges. 0 proven. 14751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:05:59,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:05:59,097 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:05:59,097 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:05:59,097 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:05:59,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:05:59,098 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 [2019-01-31 17:05:59,105 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:05:59,105 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:05:59,233 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:05:59,233 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:05:59,246 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:05:59,264 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 [2019-01-31 17:05:59,264 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:05:59,309 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:05:59,309 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:06:04,867 INFO L134 CoverageAnalysis]: Checked inductivity of 14751 backedges. 0 proven. 14751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:06:04,868 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:06:09,076 INFO L134 CoverageAnalysis]: Checked inductivity of 14751 backedges. 0 proven. 14751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:06:09,094 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:06:09,095 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100, 100] total 200 [2019-01-31 17:06:09,095 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:06:09,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 202 states [2019-01-31 17:06:09,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 202 interpolants. [2019-01-31 17:06:09,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15351, Invalid=25251, Unknown=0, NotChecked=0, Total=40602 [2019-01-31 17:06:09,098 INFO L87 Difference]: Start difference. First operand 301 states and 301 transitions. Second operand 202 states. [2019-01-31 17:06:09,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:06:09,908 INFO L93 Difference]: Finished difference Result 306 states and 306 transitions. [2019-01-31 17:06:09,909 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2019-01-31 17:06:09,909 INFO L78 Accepts]: Start accepts. Automaton has 202 states. Word has length 300 [2019-01-31 17:06:09,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:06:09,910 INFO L225 Difference]: With dead ends: 306 [2019-01-31 17:06:09,911 INFO L226 Difference]: Without dead ends: 305 [2019-01-31 17:06:09,911 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 399 SyntacticMatches, 99 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34551 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=15351, Invalid=25251, Unknown=0, NotChecked=0, Total=40602 [2019-01-31 17:06:09,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2019-01-31 17:06:09,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 304. [2019-01-31 17:06:09,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2019-01-31 17:06:09,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 304 transitions. [2019-01-31 17:06:09,916 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 304 transitions. Word has length 300 [2019-01-31 17:06:09,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:06:09,916 INFO L480 AbstractCegarLoop]: Abstraction has 304 states and 304 transitions. [2019-01-31 17:06:09,917 INFO L481 AbstractCegarLoop]: Interpolant automaton has 202 states. [2019-01-31 17:06:09,917 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 304 transitions. [2019-01-31 17:06:09,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 304 [2019-01-31 17:06:09,918 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:06:09,918 INFO L402 BasicCegarLoop]: trace histogram [101, 100, 100, 1, 1] [2019-01-31 17:06:09,918 INFO L423 AbstractCegarLoop]: === Iteration 101 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:06:09,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:06:09,919 INFO L82 PathProgramCache]: Analyzing trace with hash -1553891808, now seen corresponding path program 100 times [2019-01-31 17:06:09,919 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:06:09,919 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:06:09,919 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:06:09,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:06:09,920 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:06:09,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:06:14,384 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 14752 proven. 298 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:06:14,384 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:06:14,384 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:06:14,385 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:06:14,385 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:06:14,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:06:14,385 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 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 [2019-01-31 17:06:14,393 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:06:14,394 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:06:14,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:06:14,479 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:06:14,679 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 15050 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:06:14,679 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:06:18,786 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 15050 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:06:18,805 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-01-31 17:06:18,805 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [102, 102] imperfect sequences [102] total 103 [2019-01-31 17:06:18,805 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-01-31 17:06:18,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 103 states [2019-01-31 17:06:18,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2019-01-31 17:06:18,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5256, Invalid=5456, Unknown=0, NotChecked=0, Total=10712 [2019-01-31 17:06:18,807 INFO L87 Difference]: Start difference. First operand 304 states and 304 transitions. Second operand 103 states. [2019-01-31 17:06:19,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:06:19,645 INFO L93 Difference]: Finished difference Result 306 states and 306 transitions. [2019-01-31 17:06:19,646 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2019-01-31 17:06:19,646 INFO L78 Accepts]: Start accepts. Automaton has 103 states. Word has length 303 [2019-01-31 17:06:19,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:06:19,647 INFO L225 Difference]: With dead ends: 306 [2019-01-31 17:06:19,647 INFO L226 Difference]: Without dead ends: 0 [2019-01-31 17:06:19,650 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 706 GetRequests, 504 SyntacticMatches, 100 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5544 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=5256, Invalid=5456, Unknown=0, NotChecked=0, Total=10712 [2019-01-31 17:06:19,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-01-31 17:06:19,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-01-31 17:06:19,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-01-31 17:06:19,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-01-31 17:06:19,651 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 303 [2019-01-31 17:06:19,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:06:19,651 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-01-31 17:06:19,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has 103 states. [2019-01-31 17:06:19,651 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-01-31 17:06:19,651 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-01-31 17:06:19,655 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2019-01-31 17:06:19,784 WARN L181 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 511 [2019-01-31 17:06:22,907 WARN L181 SmtUtils]: Spent 3.12 s on a formula simplification. DAG size of input: 511 DAG size of output: 509 [2019-01-31 17:06:22,914 INFO L448 ceAbstractionStarter]: For program point mainENTRY(lines 2 23) no Hoare annotation was computed. [2019-01-31 17:06:22,914 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 2 23) no Hoare annotation was computed. [2019-01-31 17:06:22,914 INFO L448 ceAbstractionStarter]: For program point L15(line 15) no Hoare annotation was computed. [2019-01-31 17:06:22,915 INFO L448 ceAbstractionStarter]: For program point L14(lines 14 19) no Hoare annotation was computed. [2019-01-31 17:06:22,917 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))) [2019-01-31 17:06:22,917 INFO L448 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONASSERT(line 15) no Hoare annotation was computed. [2019-01-31 17:06:22,917 INFO L448 ceAbstractionStarter]: For program point L12-2(lines 2 23) no Hoare annotation was computed. [2019-01-31 17:06:22,992 INFO L202 PluginConnector]: Adding new model PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 31.01 05:06:22 BoogieIcfgContainer [2019-01-31 17:06:22,992 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-01-31 17:06:22,993 INFO L168 Benchmark]: Toolchain (without parser) took 714129.93 ms. Allocated memory was 138.9 MB in the beginning and 2.1 GB in the end (delta: 2.0 GB). Free memory was 106.2 MB in the beginning and 2.0 GB in the end (delta: -1.9 GB). Peak memory consumption was 1.9 GB. Max. memory is 7.1 GB. [2019-01-31 17:06:22,993 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.18 ms. Allocated memory is still 138.9 MB. Free memory is still 107.7 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-01-31 17:06:22,994 INFO L168 Benchmark]: Boogie Procedure Inliner took 54.54 ms. Allocated memory is still 138.9 MB. Free memory was 106.2 MB in the beginning and 104.1 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.2 MB. Max. memory is 7.1 GB. [2019-01-31 17:06:22,994 INFO L168 Benchmark]: Boogie Preprocessor took 25.82 ms. Allocated memory is still 138.9 MB. Free memory was 103.9 MB in the beginning and 102.7 MB in the end (delta: 1.1 MB). Peak memory consumption was 1.1 MB. Max. memory is 7.1 GB. [2019-01-31 17:06:22,995 INFO L168 Benchmark]: RCFGBuilder took 262.35 ms. Allocated memory is still 138.9 MB. Free memory was 102.7 MB in the beginning and 92.9 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2019-01-31 17:06:22,995 INFO L168 Benchmark]: TraceAbstraction took 713782.49 ms. Allocated memory was 138.9 MB in the beginning and 2.1 GB in the end (delta: 2.0 GB). Free memory was 92.5 MB in the beginning and 2.0 GB in the end (delta: -1.9 GB). Peak memory consumption was 1.9 GB. Max. memory is 7.1 GB. [2019-01-31 17:06:22,997 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 0.18 ms. Allocated memory is still 138.9 MB. Free memory is still 107.7 MB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 54.54 ms. Allocated memory is still 138.9 MB. Free memory was 106.2 MB in the beginning and 104.1 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 25.82 ms. Allocated memory is still 138.9 MB. Free memory was 103.9 MB in the beginning and 102.7 MB in the end (delta: 1.1 MB). Peak memory consumption was 1.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 262.35 ms. Allocated memory is still 138.9 MB. Free memory was 102.7 MB in the beginning and 92.9 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 713782.49 ms. Allocated memory was 138.9 MB in the beginning and 2.1 GB in the end (delta: 2.0 GB). Free memory was 92.5 MB in the beginning and 2.0 GB in the end (delta: -1.9 GB). Peak memory consumption was 1.9 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 <= 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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, 713.6s OverallTime, 101 OverallIterations, 101 TraceHistogramMax, 41.9s AutomataDifference, 0.0s DeadEndRemovalTime, 3.2s 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, 622.5s 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, 0.1s 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, 3.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.7s SsaConstructionTime, 12.8s SatisfiabilityAnalysisTime, 646.3s 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...