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_array_oct.epf -i ../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/PointerIncrement-simplified03.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fa1c628-m [2019-01-31 17:22:02,541 INFO L170 SettingsManager]: Resetting all preferences to default values... [2019-01-31 17:22:02,543 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2019-01-31 17:22:02,555 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-01-31 17:22:02,597 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf [2019-01-31 17:22:02,611 INFO L110 SettingsManager]: Loading preferences was successful [2019-01-31 17:22:02,612 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2019-01-31 17:22:02,613 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2019-01-31 17:22:02,613 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2019-01-31 17:22:02,613 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-01-31 17:22:02,613 INFO L133 SettingsManager]: * User list type=DISABLED [2019-01-31 17:22:02,614 INFO L133 SettingsManager]: * Inline calls to unimplemented procedures=true [2019-01-31 17:22:02,614 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-01-31 17:22:02,614 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-01-31 17:22:02,614 INFO L133 SettingsManager]: * Underlying domain=OctagonDomain [2019-01-31 17:22:02,614 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2019-01-31 17:22:02,615 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-01-31 17:22:02,615 INFO L133 SettingsManager]: * Interval Domain=false [2019-01-31 17:22:02,615 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-01-31 17:22:02,616 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2019-01-31 17:22:02,616 INFO L133 SettingsManager]: * Use SBE=true [2019-01-31 17:22:02,616 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-01-31 17:22:02,616 INFO L133 SettingsManager]: * sizeof long=4 [2019-01-31 17:22:02,616 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2019-01-31 17:22:02,617 INFO L133 SettingsManager]: * sizeof POINTER=4 [2019-01-31 17:22:02,617 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2019-01-31 17:22:02,617 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-01-31 17:22:02,617 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-01-31 17:22:02,617 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-01-31 17:22:02,618 INFO L133 SettingsManager]: * sizeof long double=12 [2019-01-31 17:22:02,618 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2019-01-31 17:22:02,618 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-01-31 17:22:02,618 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-01-31 17:22:02,618 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-01-31 17:22:02,619 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2019-01-31 17:22:02,619 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:8092 -smt2 -in -t:10000 [2019-01-31 17:22:02,619 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-01-31 17:22:02,619 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-01-31 17:22:02,619 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-01-31 17:22:02,620 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-01-31 17:22:02,620 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-01-31 17:22:02,620 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:8092 -smt2 -in [2019-01-31 17:22:02,620 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-01-31 17:22:02,620 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-01-31 17:22:02,663 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-01-31 17:22:02,675 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-01-31 17:22:02,682 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-01-31 17:22:02,683 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2019-01-31 17:22:02,684 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2019-01-31 17:22:02,684 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/PointerIncrement-simplified03.bpl [2019-01-31 17:22:02,685 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/PointerIncrement-simplified03.bpl' [2019-01-31 17:22:02,732 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-01-31 17:22:02,734 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-01-31 17:22:02,735 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-01-31 17:22:02,735 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-01-31 17:22:02,735 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2019-01-31 17:22:02,753 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 05:22:02" (1/1) ... [2019-01-31 17:22:02,766 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 05:22:02" (1/1) ... [2019-01-31 17:22:02,774 WARN L165 Inliner]: Program contained no entry procedure! [2019-01-31 17:22:02,774 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2019-01-31 17:22:02,774 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2019-01-31 17:22:02,792 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-01-31 17:22:02,793 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-01-31 17:22:02,793 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-01-31 17:22:02,794 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2019-01-31 17:22:02,805 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 05:22:02" (1/1) ... [2019-01-31 17:22:02,806 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 05:22:02" (1/1) ... [2019-01-31 17:22:02,807 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 05:22:02" (1/1) ... [2019-01-31 17:22:02,807 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 05:22:02" (1/1) ... [2019-01-31 17:22:02,812 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 05:22:02" (1/1) ... [2019-01-31 17:22:02,818 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 05:22:02" (1/1) ... [2019-01-31 17:22:02,819 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 05:22:02" (1/1) ... [2019-01-31 17:22:02,820 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-01-31 17:22:02,821 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-01-31 17:22:02,821 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-01-31 17:22:02,821 INFO L276 PluginConnector]: RCFGBuilder initialized [2019-01-31 17:22:02,822 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 31.01 05:22:02" (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 17:22:02,895 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-01-31 17:22:02,895 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-01-31 17:22:02,895 INFO L130 BoogieDeclarations]: Found specification of procedure ~malloc [2019-01-31 17:22:03,116 INFO L278 CfgBuilder]: Using library mode [2019-01-31 17:22:03,117 INFO L286 CfgBuilder]: Removed 3 assue(true) statements. [2019-01-31 17:22:03,118 INFO L202 PluginConnector]: Adding new model PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 05:22:03 BoogieIcfgContainer [2019-01-31 17:22:03,118 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-01-31 17:22:03,119 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-01-31 17:22:03,119 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-01-31 17:22:03,122 INFO L276 PluginConnector]: TraceAbstraction initialized [2019-01-31 17:22:03,123 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 31.01 05:22:02" (1/2) ... [2019-01-31 17:22:03,124 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37c2f8d2 and model type PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 05:22:03, skipping insertion in model container [2019-01-31 17:22:03,124 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 05:22:03" (2/2) ... [2019-01-31 17:22:03,126 INFO L112 eAbstractionObserver]: Analyzing ICFG PointerIncrement-simplified03.bpl [2019-01-31 17:22:03,135 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-01-31 17:22:03,143 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-01-31 17:22:03,160 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-01-31 17:22:03,198 INFO L382 AbstractCegarLoop]: Interprodecural is true [2019-01-31 17:22:03,198 INFO L383 AbstractCegarLoop]: Hoare is true [2019-01-31 17:22:03,198 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-01-31 17:22:03,198 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-01-31 17:22:03,198 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-01-31 17:22:03,199 INFO L387 AbstractCegarLoop]: Difference is false [2019-01-31 17:22:03,199 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-01-31 17:22:03,199 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-01-31 17:22:03,216 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2019-01-31 17:22:03,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2019-01-31 17:22:03,232 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:03,233 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2019-01-31 17:22:03,237 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:03,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:03,245 INFO L82 PathProgramCache]: Analyzing trace with hash 29984, now seen corresponding path program 1 times [2019-01-31 17:22:03,248 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:03,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:03,298 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:03,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:03,298 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:03,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:03,461 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 17:22:03,464 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-01-31 17:22:03,465 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2019-01-31 17:22:03,465 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-01-31 17:22:03,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-01-31 17:22:03,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-01-31 17:22:03,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-01-31 17:22:03,494 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2019-01-31 17:22:03,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:03,614 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2019-01-31 17:22:03,615 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-01-31 17:22:03,616 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2019-01-31 17:22:03,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:03,628 INFO L225 Difference]: With dead ends: 15 [2019-01-31 17:22:03,628 INFO L226 Difference]: Without dead ends: 8 [2019-01-31 17:22:03,632 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 17:22:03,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2019-01-31 17:22:03,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 7. [2019-01-31 17:22:03,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2019-01-31 17:22:03,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2019-01-31 17:22:03,666 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 3 [2019-01-31 17:22:03,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:03,666 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2019-01-31 17:22:03,666 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-01-31 17:22:03,667 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2019-01-31 17:22:03,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-01-31 17:22:03,667 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:03,667 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2019-01-31 17:22:03,668 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:03,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:03,668 INFO L82 PathProgramCache]: Analyzing trace with hash 893294860, now seen corresponding path program 1 times [2019-01-31 17:22:03,669 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:03,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:03,670 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:03,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:03,670 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:03,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:03,839 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 17:22:03,840 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:03,840 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:03,842 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 7 with the following transitions: [2019-01-31 17:22:03,844 INFO L207 CegarAbsIntRunner]: [0], [6], [7], [8], [12] [2019-01-31 17:22:03,911 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2019-01-31 17:22:03,912 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2019-01-31 17:22:12,632 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-01-31 17:22:12,634 INFO L272 AbstractInterpreter]: Visited 5 different actions 38 times. Merged at 4 different actions 33 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2019-01-31 17:22:12,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:12,640 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-01-31 17:22:12,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:12,640 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 17:22:12,651 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:12,651 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:22:12,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:12,678 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:12,726 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 17:22:12,727 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:12,766 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 17:22:12,767 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:12,931 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 17:22:12,932 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:12,970 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 17:22:13,002 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:13,002 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2019-01-31 17:22:13,002 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:13,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-01-31 17:22:13,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-01-31 17:22:13,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2019-01-31 17:22:13,005 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 6 states. [2019-01-31 17:22:13,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:13,068 INFO L93 Difference]: Finished difference Result 12 states and 12 transitions. [2019-01-31 17:22:13,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-01-31 17:22:13,069 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2019-01-31 17:22:13,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:13,070 INFO L225 Difference]: With dead ends: 12 [2019-01-31 17:22:13,071 INFO L226 Difference]: Without dead ends: 11 [2019-01-31 17:22:13,072 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2019-01-31 17:22:13,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2019-01-31 17:22:13,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 10. [2019-01-31 17:22:13,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2019-01-31 17:22:13,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2019-01-31 17:22:13,075 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 6 [2019-01-31 17:22:13,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:13,076 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2019-01-31 17:22:13,076 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-01-31 17:22:13,077 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2019-01-31 17:22:13,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-01-31 17:22:13,078 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:13,078 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1] [2019-01-31 17:22:13,078 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:13,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:13,079 INFO L82 PathProgramCache]: Analyzing trace with hash 529849760, now seen corresponding path program 2 times [2019-01-31 17:22:13,079 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:13,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:13,080 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:13,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:13,080 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:13,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:13,252 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 17:22:13,252 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:13,253 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:13,253 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:13,253 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:13,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:13,253 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 17:22:13,272 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:22:13,273 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:22:13,323 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-01-31 17:22:13,323 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:13,326 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:13,357 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 17:22:13,358 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:13,452 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 17:22:13,452 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:13,774 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 17:22:13,775 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:13,892 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 17:22:13,912 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:13,912 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2019-01-31 17:22:13,912 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:13,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-01-31 17:22:13,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-01-31 17:22:13,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2019-01-31 17:22:13,914 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 8 states. [2019-01-31 17:22:14,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:14,051 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2019-01-31 17:22:14,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-01-31 17:22:14,052 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 9 [2019-01-31 17:22:14,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:14,053 INFO L225 Difference]: With dead ends: 15 [2019-01-31 17:22:14,053 INFO L226 Difference]: Without dead ends: 14 [2019-01-31 17:22:14,054 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2019-01-31 17:22:14,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-01-31 17:22:14,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2019-01-31 17:22:14,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-01-31 17:22:14,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-01-31 17:22:14,058 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 9 [2019-01-31 17:22:14,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:14,059 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-01-31 17:22:14,060 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-01-31 17:22:14,060 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-01-31 17:22:14,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-01-31 17:22:14,060 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:14,060 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1] [2019-01-31 17:22:14,061 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:14,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:14,061 INFO L82 PathProgramCache]: Analyzing trace with hash 749428876, now seen corresponding path program 3 times [2019-01-31 17:22:14,061 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:14,062 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:14,062 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:14,062 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:14,062 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:14,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:14,178 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 17:22:14,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:14,178 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:14,178 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:14,179 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:14,179 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:14,179 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 17:22:14,189 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:22:14,190 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:22:14,222 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:22:14,223 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:14,224 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:14,228 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 17:22:14,229 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:14,245 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 17:22:14,245 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:14,377 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 17:22:14,378 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:14,431 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 17:22:14,450 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:14,450 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2019-01-31 17:22:14,450 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:14,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-01-31 17:22:14,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-01-31 17:22:14,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=97, Unknown=0, NotChecked=0, Total=182 [2019-01-31 17:22:14,452 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 10 states. [2019-01-31 17:22:14,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:14,769 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2019-01-31 17:22:14,769 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-01-31 17:22:14,770 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 12 [2019-01-31 17:22:14,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:14,770 INFO L225 Difference]: With dead ends: 18 [2019-01-31 17:22:14,770 INFO L226 Difference]: Without dead ends: 17 [2019-01-31 17:22:14,771 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=85, Invalid=97, Unknown=0, NotChecked=0, Total=182 [2019-01-31 17:22:14,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-01-31 17:22:14,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2019-01-31 17:22:14,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-01-31 17:22:14,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2019-01-31 17:22:14,775 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 12 [2019-01-31 17:22:14,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:14,775 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2019-01-31 17:22:14,775 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-01-31 17:22:14,775 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2019-01-31 17:22:14,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-01-31 17:22:14,776 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:14,776 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1] [2019-01-31 17:22:14,776 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:14,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:14,777 INFO L82 PathProgramCache]: Analyzing trace with hash 995681824, now seen corresponding path program 4 times [2019-01-31 17:22:14,777 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:14,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:14,778 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:14,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:14,778 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:14,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:14,895 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 17:22:14,895 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:14,895 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:14,896 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:14,896 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:14,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:14,896 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 17:22:14,914 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:14,914 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:22:14,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:14,930 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:14,935 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 17:22:14,935 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:14,951 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 17:22:14,952 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:15,048 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 17:22:15,049 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:15,104 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 17:22:15,125 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:15,125 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 15 [2019-01-31 17:22:15,125 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:15,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-01-31 17:22:15,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-01-31 17:22:15,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=146, Unknown=0, NotChecked=0, Total=272 [2019-01-31 17:22:15,126 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 12 states. [2019-01-31 17:22:15,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:15,184 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2019-01-31 17:22:15,185 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-01-31 17:22:15,185 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 15 [2019-01-31 17:22:15,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:15,186 INFO L225 Difference]: With dead ends: 21 [2019-01-31 17:22:15,186 INFO L226 Difference]: Without dead ends: 20 [2019-01-31 17:22:15,187 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 17:22:15,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-01-31 17:22:15,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2019-01-31 17:22:15,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-01-31 17:22:15,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2019-01-31 17:22:15,190 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 15 [2019-01-31 17:22:15,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:15,191 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2019-01-31 17:22:15,191 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-01-31 17:22:15,191 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2019-01-31 17:22:15,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-01-31 17:22:15,192 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:15,192 INFO L402 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1] [2019-01-31 17:22:15,192 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:15,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:15,193 INFO L82 PathProgramCache]: Analyzing trace with hash 1313114124, now seen corresponding path program 5 times [2019-01-31 17:22:15,193 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:15,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:15,194 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:15,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:15,194 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:15,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:15,291 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 17:22:15,292 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:15,292 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:15,292 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:15,293 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:15,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:15,293 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 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 17:22:15,303 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:22:15,304 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:22:15,316 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-01-31 17:22:15,316 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:15,319 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:15,326 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 17:22:15,327 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:15,337 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 17:22:15,337 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:15,458 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 17:22:15,458 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:15,603 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 17:22:15,622 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:15,622 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 18 [2019-01-31 17:22:15,623 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:15,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-01-31 17:22:15,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-01-31 17:22:15,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=205, Unknown=0, NotChecked=0, Total=380 [2019-01-31 17:22:15,624 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 14 states. [2019-01-31 17:22:15,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:15,673 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2019-01-31 17:22:15,673 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-01-31 17:22:15,673 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 18 [2019-01-31 17:22:15,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:15,674 INFO L225 Difference]: With dead ends: 24 [2019-01-31 17:22:15,674 INFO L226 Difference]: Without dead ends: 23 [2019-01-31 17:22:15,675 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=175, Invalid=205, Unknown=0, NotChecked=0, Total=380 [2019-01-31 17:22:15,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-01-31 17:22:15,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2019-01-31 17:22:15,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-01-31 17:22:15,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2019-01-31 17:22:15,679 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 18 [2019-01-31 17:22:15,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:15,679 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2019-01-31 17:22:15,680 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-01-31 17:22:15,680 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2019-01-31 17:22:15,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-01-31 17:22:15,680 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:15,681 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1] [2019-01-31 17:22:15,681 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:15,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:15,681 INFO L82 PathProgramCache]: Analyzing trace with hash 420777632, now seen corresponding path program 6 times [2019-01-31 17:22:15,681 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:15,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:15,682 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:15,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:15,682 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:15,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:15,805 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 17:22:15,805 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:15,805 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:15,806 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:15,806 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:15,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:15,806 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 17:22:15,815 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:22:15,816 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:22:15,829 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:22:15,829 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:15,832 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:15,840 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 17:22:15,841 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:15,852 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:22:15,853 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:15,975 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 17:22:15,975 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:16,069 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 17:22:16,095 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:16,096 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 21 [2019-01-31 17:22:16,096 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:16,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-01-31 17:22:16,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-01-31 17:22:16,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=274, Unknown=0, NotChecked=0, Total=506 [2019-01-31 17:22:16,097 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 16 states. [2019-01-31 17:22:16,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:16,182 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2019-01-31 17:22:16,184 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-01-31 17:22:16,184 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 21 [2019-01-31 17:22:16,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:16,185 INFO L225 Difference]: With dead ends: 27 [2019-01-31 17:22:16,185 INFO L226 Difference]: Without dead ends: 26 [2019-01-31 17:22:16,186 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=232, Invalid=274, Unknown=0, NotChecked=0, Total=506 [2019-01-31 17:22:16,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-01-31 17:22:16,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2019-01-31 17:22:16,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-01-31 17:22:16,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2019-01-31 17:22:16,190 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 21 [2019-01-31 17:22:16,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:16,190 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2019-01-31 17:22:16,191 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-01-31 17:22:16,191 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2019-01-31 17:22:16,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-01-31 17:22:16,191 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:16,191 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1] [2019-01-31 17:22:16,192 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:16,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:16,192 INFO L82 PathProgramCache]: Analyzing trace with hash -1623060596, now seen corresponding path program 7 times [2019-01-31 17:22:16,192 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:16,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:16,194 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:16,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:16,194 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:16,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:16,314 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 17:22:16,314 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:16,314 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:16,315 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:16,315 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:16,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:16,315 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 17:22:16,323 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:16,324 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:22:16,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:16,335 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:16,341 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 17:22:16,342 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:16,353 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 17:22:16,354 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:16,458 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 17:22:16,458 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:16,601 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 17:22:16,621 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:16,621 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 24 [2019-01-31 17:22:16,621 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:16,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-01-31 17:22:16,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-01-31 17:22:16,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=353, Unknown=0, NotChecked=0, Total=650 [2019-01-31 17:22:16,623 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 18 states. [2019-01-31 17:22:16,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:16,818 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2019-01-31 17:22:16,819 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-01-31 17:22:16,819 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 24 [2019-01-31 17:22:16,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:16,820 INFO L225 Difference]: With dead ends: 30 [2019-01-31 17:22:16,821 INFO L226 Difference]: Without dead ends: 29 [2019-01-31 17:22:16,822 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=297, Invalid=353, Unknown=0, NotChecked=0, Total=650 [2019-01-31 17:22:16,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-01-31 17:22:16,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2019-01-31 17:22:16,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-01-31 17:22:16,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2019-01-31 17:22:16,826 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 24 [2019-01-31 17:22:16,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:16,826 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2019-01-31 17:22:16,826 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-01-31 17:22:16,826 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2019-01-31 17:22:16,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-01-31 17:22:16,827 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:16,827 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1] [2019-01-31 17:22:16,827 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:16,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:16,828 INFO L82 PathProgramCache]: Analyzing trace with hash 143644448, now seen corresponding path program 8 times [2019-01-31 17:22:16,828 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:16,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:16,829 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:16,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:16,829 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:16,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:17,016 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 17:22:17,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:17,016 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:17,017 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:17,017 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:17,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:17,017 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 17:22:17,035 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:22:17,036 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:22:17,094 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-01-31 17:22:17,095 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:17,097 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:17,100 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 17:22:17,101 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:17,114 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 17:22:17,115 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:17,270 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 17:22:17,270 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:17,443 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 17:22:17,484 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:17,485 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 27 [2019-01-31 17:22:17,485 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:17,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-01-31 17:22:17,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-01-31 17:22:17,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=442, Unknown=0, NotChecked=0, Total=812 [2019-01-31 17:22:17,486 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2019-01-31 17:22:17,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:17,645 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2019-01-31 17:22:17,645 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-01-31 17:22:17,646 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2019-01-31 17:22:17,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:17,647 INFO L225 Difference]: With dead ends: 33 [2019-01-31 17:22:17,647 INFO L226 Difference]: Without dead ends: 32 [2019-01-31 17:22:17,648 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 17:22:17,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-01-31 17:22:17,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2019-01-31 17:22:17,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-01-31 17:22:17,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2019-01-31 17:22:17,653 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 27 [2019-01-31 17:22:17,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:17,653 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2019-01-31 17:22:17,653 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-01-31 17:22:17,653 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2019-01-31 17:22:17,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-01-31 17:22:17,654 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:17,654 INFO L402 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1] [2019-01-31 17:22:17,655 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:17,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:17,655 INFO L82 PathProgramCache]: Analyzing trace with hash 1524365068, now seen corresponding path program 9 times [2019-01-31 17:22:17,655 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:17,658 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:17,658 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:17,658 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:17,659 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:17,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:17,876 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 17:22:17,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:17,877 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:17,877 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:17,877 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:17,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:17,877 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 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 17:22:17,887 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:22:17,887 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:22:17,906 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:22:17,906 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:17,909 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:17,926 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 17:22:17,927 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:17,938 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 17:22:17,939 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:18,153 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 17:22:18,154 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:18,430 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 17:22:18,449 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:18,449 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 30 [2019-01-31 17:22:18,449 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:18,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-01-31 17:22:18,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-01-31 17:22:18,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=541, Unknown=0, NotChecked=0, Total=992 [2019-01-31 17:22:18,451 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 22 states. [2019-01-31 17:22:18,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:18,524 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2019-01-31 17:22:18,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-01-31 17:22:18,524 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 30 [2019-01-31 17:22:18,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:18,526 INFO L225 Difference]: With dead ends: 36 [2019-01-31 17:22:18,526 INFO L226 Difference]: Without dead ends: 35 [2019-01-31 17:22:18,527 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=451, Invalid=541, Unknown=0, NotChecked=0, Total=992 [2019-01-31 17:22:18,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-01-31 17:22:18,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2019-01-31 17:22:18,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-01-31 17:22:18,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2019-01-31 17:22:18,532 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 30 [2019-01-31 17:22:18,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:18,532 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2019-01-31 17:22:18,533 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-01-31 17:22:18,533 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2019-01-31 17:22:18,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-01-31 17:22:18,534 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:18,534 INFO L402 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1] [2019-01-31 17:22:18,534 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:18,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:18,534 INFO L82 PathProgramCache]: Analyzing trace with hash 1670561696, now seen corresponding path program 10 times [2019-01-31 17:22:18,534 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:18,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:18,535 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:18,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:18,535 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:18,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:18,699 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 17:22:18,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:18,699 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:18,700 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:18,700 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:18,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:18,700 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:22:18,709 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:18,709 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:22:18,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:18,738 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:18,755 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 17:22:18,756 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:18,772 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 17:22:18,773 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:18,931 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 17:22:18,932 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:19,196 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 17:22:19,222 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:19,222 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 33 [2019-01-31 17:22:19,222 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:19,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-01-31 17:22:19,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-01-31 17:22:19,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=650, Unknown=0, NotChecked=0, Total=1190 [2019-01-31 17:22:19,224 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 24 states. [2019-01-31 17:22:19,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:19,325 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2019-01-31 17:22:19,327 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-01-31 17:22:19,327 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 33 [2019-01-31 17:22:19,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:19,328 INFO L225 Difference]: With dead ends: 39 [2019-01-31 17:22:19,328 INFO L226 Difference]: Without dead ends: 38 [2019-01-31 17:22:19,329 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=540, Invalid=650, Unknown=0, NotChecked=0, Total=1190 [2019-01-31 17:22:19,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-01-31 17:22:19,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2019-01-31 17:22:19,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-01-31 17:22:19,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2019-01-31 17:22:19,333 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 33 [2019-01-31 17:22:19,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:19,333 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2019-01-31 17:22:19,333 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-01-31 17:22:19,333 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2019-01-31 17:22:19,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-01-31 17:22:19,334 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:19,334 INFO L402 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1] [2019-01-31 17:22:19,335 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:19,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:19,335 INFO L82 PathProgramCache]: Analyzing trace with hash 1917468300, now seen corresponding path program 11 times [2019-01-31 17:22:19,335 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:19,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:19,336 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:19,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:19,336 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:19,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:19,525 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 17:22:19,526 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:19,526 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:19,526 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:19,526 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:19,526 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:19,526 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 17:22:19,536 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:22:19,536 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:22:19,579 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-01-31 17:22:19,579 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:19,582 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:19,606 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 17:22:19,607 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:19,637 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 17:22:19,638 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:19,828 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 17:22:19,828 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:20,026 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 17:22:20,045 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:20,046 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 36 [2019-01-31 17:22:20,046 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:20,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-01-31 17:22:20,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-01-31 17:22:20,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=637, Invalid=769, Unknown=0, NotChecked=0, Total=1406 [2019-01-31 17:22:20,047 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 26 states. [2019-01-31 17:22:20,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:20,143 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2019-01-31 17:22:20,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-01-31 17:22:20,143 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 36 [2019-01-31 17:22:20,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:20,144 INFO L225 Difference]: With dead ends: 42 [2019-01-31 17:22:20,145 INFO L226 Difference]: Without dead ends: 41 [2019-01-31 17:22:20,146 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=637, Invalid=769, Unknown=0, NotChecked=0, Total=1406 [2019-01-31 17:22:20,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-01-31 17:22:20,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2019-01-31 17:22:20,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-01-31 17:22:20,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2019-01-31 17:22:20,151 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 36 [2019-01-31 17:22:20,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:20,151 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2019-01-31 17:22:20,151 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-01-31 17:22:20,151 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2019-01-31 17:22:20,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-01-31 17:22:20,152 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:20,152 INFO L402 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1] [2019-01-31 17:22:20,152 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:20,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:20,153 INFO L82 PathProgramCache]: Analyzing trace with hash 233130016, now seen corresponding path program 12 times [2019-01-31 17:22:20,153 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:20,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:20,154 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:20,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:20,154 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:20,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:20,549 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 17:22:20,549 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:20,549 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:20,549 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:20,550 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:20,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:20,550 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 17:22:20,559 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:22:20,559 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:22:20,581 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:22:20,581 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:20,586 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:20,589 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 17:22:20,590 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:20,598 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 17:22:20,599 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:20,812 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 17:22:20,812 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:21,070 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 17:22:21,089 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:21,089 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 39 [2019-01-31 17:22:21,089 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:21,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-01-31 17:22:21,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-01-31 17:22:21,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=742, Invalid=898, Unknown=0, NotChecked=0, Total=1640 [2019-01-31 17:22:21,091 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 28 states. [2019-01-31 17:22:21,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:21,172 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2019-01-31 17:22:21,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-01-31 17:22:21,172 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 39 [2019-01-31 17:22:21,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:21,173 INFO L225 Difference]: With dead ends: 45 [2019-01-31 17:22:21,174 INFO L226 Difference]: Without dead ends: 44 [2019-01-31 17:22:21,175 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 17:22:21,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-01-31 17:22:21,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2019-01-31 17:22:21,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-01-31 17:22:21,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2019-01-31 17:22:21,180 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 39 [2019-01-31 17:22:21,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:21,180 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2019-01-31 17:22:21,180 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-01-31 17:22:21,181 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2019-01-31 17:22:21,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-01-31 17:22:21,181 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:21,181 INFO L402 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1] [2019-01-31 17:22:21,182 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:21,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:21,182 INFO L82 PathProgramCache]: Analyzing trace with hash 214230540, now seen corresponding path program 13 times [2019-01-31 17:22:21,182 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:21,183 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:21,183 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:21,183 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:21,183 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:21,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:21,460 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 17:22:21,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:21,460 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:21,460 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:21,461 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:21,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:21,461 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 17:22:21,471 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:21,471 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:22:21,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:21,491 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:21,496 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 17:22:21,497 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:21,535 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 17:22:21,536 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:21,872 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 17:22:21,872 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:22,895 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 17:22:22,915 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:22,915 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 42 [2019-01-31 17:22:22,915 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:22,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-01-31 17:22:22,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-01-31 17:22:22,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=855, Invalid=1037, Unknown=0, NotChecked=0, Total=1892 [2019-01-31 17:22:22,917 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 30 states. [2019-01-31 17:22:23,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:23,029 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2019-01-31 17:22:23,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-01-31 17:22:23,029 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 42 [2019-01-31 17:22:23,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:23,030 INFO L225 Difference]: With dead ends: 48 [2019-01-31 17:22:23,030 INFO L226 Difference]: Without dead ends: 47 [2019-01-31 17:22:23,031 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 756 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=855, Invalid=1037, Unknown=0, NotChecked=0, Total=1892 [2019-01-31 17:22:23,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-01-31 17:22:23,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2019-01-31 17:22:23,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-01-31 17:22:23,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2019-01-31 17:22:23,036 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 42 [2019-01-31 17:22:23,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:23,037 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2019-01-31 17:22:23,037 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-01-31 17:22:23,037 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2019-01-31 17:22:23,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-01-31 17:22:23,038 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:23,038 INFO L402 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1] [2019-01-31 17:22:23,038 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:23,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:23,039 INFO L82 PathProgramCache]: Analyzing trace with hash -179343200, now seen corresponding path program 14 times [2019-01-31 17:22:23,039 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:23,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:23,039 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:23,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:23,040 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:23,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:23,401 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 17:22:23,401 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:23,401 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:23,401 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:23,402 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:23,402 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:23,402 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 17:22:23,414 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:22:23,414 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:22:23,483 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2019-01-31 17:22:23,483 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:23,486 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:23,493 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 17:22:23,494 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:23,503 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 17:22:23,503 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:24,492 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 17:22:24,492 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:24,787 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 17:22:24,805 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:24,806 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 45 [2019-01-31 17:22:24,806 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:24,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-01-31 17:22:24,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-01-31 17:22:24,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=976, Invalid=1186, Unknown=0, NotChecked=0, Total=2162 [2019-01-31 17:22:24,808 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 32 states. [2019-01-31 17:22:25,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:25,026 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2019-01-31 17:22:25,027 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-01-31 17:22:25,027 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 45 [2019-01-31 17:22:25,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:25,027 INFO L225 Difference]: With dead ends: 51 [2019-01-31 17:22:25,028 INFO L226 Difference]: Without dead ends: 50 [2019-01-31 17:22:25,029 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 870 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=976, Invalid=1186, Unknown=0, NotChecked=0, Total=2162 [2019-01-31 17:22:25,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-01-31 17:22:25,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2019-01-31 17:22:25,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-01-31 17:22:25,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2019-01-31 17:22:25,039 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 45 [2019-01-31 17:22:25,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:25,039 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2019-01-31 17:22:25,039 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-01-31 17:22:25,039 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2019-01-31 17:22:25,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-01-31 17:22:25,040 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:25,040 INFO L402 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1] [2019-01-31 17:22:25,041 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:25,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:25,041 INFO L82 PathProgramCache]: Analyzing trace with hash 126086540, now seen corresponding path program 15 times [2019-01-31 17:22:25,041 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:25,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:25,044 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:25,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:25,044 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:25,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:25,287 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 17:22:25,288 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:25,288 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:25,288 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:25,288 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:25,288 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:25,288 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 17:22:25,297 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:22:25,298 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:22:25,312 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:22:25,312 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:25,315 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:25,325 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 17:22:25,325 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:25,330 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 17:22:25,331 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:25,547 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 17:22:25,547 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:25,935 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 17:22:25,954 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:25,954 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 48 [2019-01-31 17:22:25,954 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:25,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-01-31 17:22:25,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-01-31 17:22:25,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1105, Invalid=1345, Unknown=0, NotChecked=0, Total=2450 [2019-01-31 17:22:25,956 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 34 states. [2019-01-31 17:22:26,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:26,065 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2019-01-31 17:22:26,065 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-01-31 17:22:26,066 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 48 [2019-01-31 17:22:26,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:26,066 INFO L225 Difference]: With dead ends: 54 [2019-01-31 17:22:26,067 INFO L226 Difference]: Without dead ends: 53 [2019-01-31 17:22:26,068 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1105, Invalid=1345, Unknown=0, NotChecked=0, Total=2450 [2019-01-31 17:22:26,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-01-31 17:22:26,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2019-01-31 17:22:26,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-01-31 17:22:26,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2019-01-31 17:22:26,077 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 48 [2019-01-31 17:22:26,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:26,077 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2019-01-31 17:22:26,077 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-01-31 17:22:26,077 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2019-01-31 17:22:26,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-01-31 17:22:26,078 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:26,078 INFO L402 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1] [2019-01-31 17:22:26,078 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:26,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:26,079 INFO L82 PathProgramCache]: Analyzing trace with hash -1852229344, now seen corresponding path program 16 times [2019-01-31 17:22:26,079 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:26,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:26,079 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:26,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:26,080 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:26,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:26,810 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 17:22:26,811 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:26,811 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:26,811 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:26,811 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:26,811 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:26,811 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 17:22:26,819 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:26,819 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:22:26,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:26,840 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:26,862 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 17:22:26,862 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:26,875 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 17:22:26,875 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:29,202 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 17:22:29,202 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:29,598 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 17:22:29,617 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:29,617 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 51 [2019-01-31 17:22:29,617 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:29,617 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-01-31 17:22:29,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-01-31 17:22:29,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1242, Invalid=1514, Unknown=0, NotChecked=0, Total=2756 [2019-01-31 17:22:29,619 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 36 states. [2019-01-31 17:22:29,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:29,745 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2019-01-31 17:22:29,745 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-01-31 17:22:29,745 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 51 [2019-01-31 17:22:29,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:29,746 INFO L225 Difference]: With dead ends: 57 [2019-01-31 17:22:29,746 INFO L226 Difference]: Without dead ends: 56 [2019-01-31 17:22:29,748 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1122 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1242, Invalid=1514, Unknown=0, NotChecked=0, Total=2756 [2019-01-31 17:22:29,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-01-31 17:22:29,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2019-01-31 17:22:29,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-01-31 17:22:29,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2019-01-31 17:22:29,753 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 51 [2019-01-31 17:22:29,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:29,754 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2019-01-31 17:22:29,754 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-01-31 17:22:29,754 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2019-01-31 17:22:29,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-01-31 17:22:29,755 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:29,755 INFO L402 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1] [2019-01-31 17:22:29,755 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:29,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:29,756 INFO L82 PathProgramCache]: Analyzing trace with hash 1975473420, now seen corresponding path program 17 times [2019-01-31 17:22:29,756 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:29,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:29,757 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:29,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:29,757 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:29,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:30,015 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 17:22:30,015 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:30,015 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:30,015 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:30,016 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:30,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:30,016 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 17:22:30,024 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:22:30,024 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:22:30,064 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2019-01-31 17:22:30,064 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:30,069 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:30,074 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 17:22:30,075 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:30,088 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:22:30,088 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:30,353 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 17:22:30,354 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:30,795 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 17:22:30,814 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:30,814 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 54 [2019-01-31 17:22:30,814 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:30,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-01-31 17:22:30,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-01-31 17:22:30,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1387, Invalid=1693, Unknown=0, NotChecked=0, Total=3080 [2019-01-31 17:22:30,816 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 38 states. [2019-01-31 17:22:30,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:30,935 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2019-01-31 17:22:30,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-01-31 17:22:30,935 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 54 [2019-01-31 17:22:30,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:30,936 INFO L225 Difference]: With dead ends: 60 [2019-01-31 17:22:30,936 INFO L226 Difference]: Without dead ends: 59 [2019-01-31 17:22:30,938 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1260 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1387, Invalid=1693, Unknown=0, NotChecked=0, Total=3080 [2019-01-31 17:22:30,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-01-31 17:22:30,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2019-01-31 17:22:30,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-01-31 17:22:30,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2019-01-31 17:22:30,942 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 54 [2019-01-31 17:22:30,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:30,942 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2019-01-31 17:22:30,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-01-31 17:22:30,942 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2019-01-31 17:22:30,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-01-31 17:22:30,943 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:30,943 INFO L402 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1] [2019-01-31 17:22:30,943 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:30,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:30,944 INFO L82 PathProgramCache]: Analyzing trace with hash 1686806944, now seen corresponding path program 18 times [2019-01-31 17:22:30,944 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:30,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:30,944 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:30,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:30,945 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:30,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:31,279 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 17:22:31,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:31,279 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:31,279 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:31,279 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:31,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:31,280 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 17:22:31,289 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:22:31,290 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:22:31,308 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:22:31,308 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:31,312 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:31,328 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-01-31 17:22:31,329 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:31,338 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 17:22:31,338 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:31,866 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 17:22:31,867 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:32,521 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 17:22:32,540 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:32,540 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 57 [2019-01-31 17:22:32,540 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:32,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2019-01-31 17:22:32,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2019-01-31 17:22:32,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1540, Invalid=1882, Unknown=0, NotChecked=0, Total=3422 [2019-01-31 17:22:32,542 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 40 states. [2019-01-31 17:22:32,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:32,657 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2019-01-31 17:22:32,657 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-01-31 17:22:32,657 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 57 [2019-01-31 17:22:32,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:32,658 INFO L225 Difference]: With dead ends: 63 [2019-01-31 17:22:32,658 INFO L226 Difference]: Without dead ends: 62 [2019-01-31 17:22:32,660 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1406 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1540, Invalid=1882, Unknown=0, NotChecked=0, Total=3422 [2019-01-31 17:22:32,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-01-31 17:22:32,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2019-01-31 17:22:32,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-01-31 17:22:32,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2019-01-31 17:22:32,664 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 57 [2019-01-31 17:22:32,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:32,665 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2019-01-31 17:22:32,665 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2019-01-31 17:22:32,665 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2019-01-31 17:22:32,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-01-31 17:22:32,666 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:32,666 INFO L402 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1] [2019-01-31 17:22:32,666 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:32,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:32,666 INFO L82 PathProgramCache]: Analyzing trace with hash 548347020, now seen corresponding path program 19 times [2019-01-31 17:22:32,666 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:32,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:32,667 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:32,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:32,667 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:32,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:33,079 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 17:22:33,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:33,079 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:33,079 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:33,080 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:33,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:33,080 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 17:22:33,088 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:33,088 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:22:33,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:33,109 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:33,112 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 17:22:33,112 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:33,126 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 17:22:33,127 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:33,440 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 17:22:33,441 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:33,976 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 17:22:33,995 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:33,995 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 60 [2019-01-31 17:22:33,995 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:33,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2019-01-31 17:22:33,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2019-01-31 17:22:33,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1701, Invalid=2081, Unknown=0, NotChecked=0, Total=3782 [2019-01-31 17:22:33,997 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 42 states. [2019-01-31 17:22:34,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:34,130 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2019-01-31 17:22:34,130 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-01-31 17:22:34,131 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 60 [2019-01-31 17:22:34,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:34,131 INFO L225 Difference]: With dead ends: 66 [2019-01-31 17:22:34,132 INFO L226 Difference]: Without dead ends: 65 [2019-01-31 17:22:34,134 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1560 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1701, Invalid=2081, Unknown=0, NotChecked=0, Total=3782 [2019-01-31 17:22:34,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2019-01-31 17:22:34,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2019-01-31 17:22:34,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-01-31 17:22:34,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 64 transitions. [2019-01-31 17:22:34,138 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 64 transitions. Word has length 60 [2019-01-31 17:22:34,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:34,138 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 64 transitions. [2019-01-31 17:22:34,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2019-01-31 17:22:34,138 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 64 transitions. [2019-01-31 17:22:34,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-01-31 17:22:34,139 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:34,139 INFO L402 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1] [2019-01-31 17:22:34,139 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:34,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:34,140 INFO L82 PathProgramCache]: Analyzing trace with hash 2045487648, now seen corresponding path program 20 times [2019-01-31 17:22:34,140 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:34,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:34,141 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:34,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:34,141 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:34,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:34,432 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 17:22:34,432 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:34,433 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:34,433 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:34,433 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:34,433 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:34,433 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 17:22:34,444 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:22:34,445 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:22:34,484 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2019-01-31 17:22:34,485 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:34,487 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:34,489 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 17:22:34,490 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:34,505 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 17:22:34,506 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:34,937 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 17:22:34,938 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:35,556 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 17:22:35,576 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:35,576 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 63 [2019-01-31 17:22:35,576 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:35,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-01-31 17:22:35,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-01-31 17:22:35,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1870, Invalid=2290, Unknown=0, NotChecked=0, Total=4160 [2019-01-31 17:22:35,578 INFO L87 Difference]: Start difference. First operand 64 states and 64 transitions. Second operand 44 states. [2019-01-31 17:22:35,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:35,878 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2019-01-31 17:22:35,879 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-01-31 17:22:35,879 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 63 [2019-01-31 17:22:35,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:35,880 INFO L225 Difference]: With dead ends: 69 [2019-01-31 17:22:35,880 INFO L226 Difference]: Without dead ends: 68 [2019-01-31 17:22:35,882 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1722 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1870, Invalid=2290, Unknown=0, NotChecked=0, Total=4160 [2019-01-31 17:22:35,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-01-31 17:22:35,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2019-01-31 17:22:35,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-01-31 17:22:35,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2019-01-31 17:22:35,886 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 63 [2019-01-31 17:22:35,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:35,887 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2019-01-31 17:22:35,887 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-01-31 17:22:35,887 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2019-01-31 17:22:35,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2019-01-31 17:22:35,888 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:35,888 INFO L402 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1] [2019-01-31 17:22:35,888 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:35,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:35,888 INFO L82 PathProgramCache]: Analyzing trace with hash 126567436, now seen corresponding path program 21 times [2019-01-31 17:22:35,889 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:35,889 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:35,889 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:35,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:35,890 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:35,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:36,330 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 17:22:36,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:36,331 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:36,331 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:36,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:36,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:36,331 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 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 17:22:36,340 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:22:36,340 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:22:36,361 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:22:36,361 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:36,363 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:36,367 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 17:22:36,367 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:36,376 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 17:22:36,377 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:36,751 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 17:22:36,751 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:37,675 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 17:22:37,693 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:37,693 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 66 [2019-01-31 17:22:37,693 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:37,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2019-01-31 17:22:37,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2019-01-31 17:22:37,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2047, Invalid=2509, Unknown=0, NotChecked=0, Total=4556 [2019-01-31 17:22:37,695 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 46 states. [2019-01-31 17:22:37,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:37,833 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2019-01-31 17:22:37,836 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-01-31 17:22:37,836 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 66 [2019-01-31 17:22:37,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:37,837 INFO L225 Difference]: With dead ends: 72 [2019-01-31 17:22:37,837 INFO L226 Difference]: Without dead ends: 71 [2019-01-31 17:22:37,838 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1892 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2047, Invalid=2509, Unknown=0, NotChecked=0, Total=4556 [2019-01-31 17:22:37,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2019-01-31 17:22:37,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2019-01-31 17:22:37,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-01-31 17:22:37,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2019-01-31 17:22:37,841 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 66 [2019-01-31 17:22:37,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:37,842 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2019-01-31 17:22:37,842 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2019-01-31 17:22:37,842 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2019-01-31 17:22:37,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-01-31 17:22:37,842 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:37,842 INFO L402 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1] [2019-01-31 17:22:37,843 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:37,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:37,843 INFO L82 PathProgramCache]: Analyzing trace with hash -410758496, now seen corresponding path program 22 times [2019-01-31 17:22:37,843 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:37,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:37,844 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:37,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:37,844 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:37,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:38,655 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 17:22:38,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:38,655 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:38,655 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:38,655 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:38,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:38,655 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 17:22:38,665 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:38,666 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:22:38,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:38,700 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:38,708 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 17:22:38,708 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:38,715 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 17:22:38,716 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:39,112 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 17:22:39,113 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:39,875 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 17:22:39,893 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:39,893 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 69 [2019-01-31 17:22:39,893 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:39,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2019-01-31 17:22:39,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2019-01-31 17:22:39,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2232, Invalid=2738, Unknown=0, NotChecked=0, Total=4970 [2019-01-31 17:22:39,895 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 48 states. [2019-01-31 17:22:40,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:40,068 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2019-01-31 17:22:40,068 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-01-31 17:22:40,069 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 69 [2019-01-31 17:22:40,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:40,069 INFO L225 Difference]: With dead ends: 75 [2019-01-31 17:22:40,070 INFO L226 Difference]: Without dead ends: 74 [2019-01-31 17:22:40,071 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2070 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2232, Invalid=2738, Unknown=0, NotChecked=0, Total=4970 [2019-01-31 17:22:40,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-01-31 17:22:40,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2019-01-31 17:22:40,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-01-31 17:22:40,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2019-01-31 17:22:40,074 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 69 [2019-01-31 17:22:40,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:40,075 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2019-01-31 17:22:40,075 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2019-01-31 17:22:40,075 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2019-01-31 17:22:40,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-01-31 17:22:40,075 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:40,075 INFO L402 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1] [2019-01-31 17:22:40,076 INFO L423 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:40,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:40,076 INFO L82 PathProgramCache]: Analyzing trace with hash -544486516, now seen corresponding path program 23 times [2019-01-31 17:22:40,076 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:40,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:40,077 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:40,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:40,077 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:40,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:40,439 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 17:22:40,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:40,439 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:40,439 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:40,439 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:40,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:40,440 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 17:22:40,450 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:22:40,450 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:22:40,497 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2019-01-31 17:22:40,497 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:40,500 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:40,503 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 17:22:40,503 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:40,521 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 17:22:40,522 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:40,905 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 17:22:40,905 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:41,657 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 17:22:41,676 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:41,677 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 72 [2019-01-31 17:22:41,677 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:41,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2019-01-31 17:22:41,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2019-01-31 17:22:41,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2019-01-31 17:22:41,679 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 50 states. [2019-01-31 17:22:41,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:41,854 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2019-01-31 17:22:41,854 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-01-31 17:22:41,854 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 72 [2019-01-31 17:22:41,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:41,856 INFO L225 Difference]: With dead ends: 78 [2019-01-31 17:22:41,856 INFO L226 Difference]: Without dead ends: 77 [2019-01-31 17:22:41,857 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2256 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2019-01-31 17:22:41,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2019-01-31 17:22:41,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2019-01-31 17:22:41,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-01-31 17:22:41,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 76 transitions. [2019-01-31 17:22:41,860 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 76 transitions. Word has length 72 [2019-01-31 17:22:41,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:41,861 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 76 transitions. [2019-01-31 17:22:41,861 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2019-01-31 17:22:41,861 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 76 transitions. [2019-01-31 17:22:41,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-01-31 17:22:41,861 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:41,862 INFO L402 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1] [2019-01-31 17:22:41,862 INFO L423 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:41,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:41,862 INFO L82 PathProgramCache]: Analyzing trace with hash 1293720352, now seen corresponding path program 24 times [2019-01-31 17:22:41,862 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:41,863 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:41,863 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:41,863 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:41,863 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:41,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:42,387 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 17:22:42,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:42,387 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:42,387 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:42,388 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:42,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:42,388 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 17:22:42,396 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:22:42,397 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:22:42,421 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:22:42,422 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:42,425 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:42,428 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 17:22:42,428 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:42,438 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 17:22:42,438 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:42,921 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 17:22:42,921 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:43,776 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 17:22:43,795 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:43,795 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 75 [2019-01-31 17:22:43,795 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:43,795 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2019-01-31 17:22:43,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2019-01-31 17:22:43,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=3226, Unknown=0, NotChecked=0, Total=5852 [2019-01-31 17:22:43,797 INFO L87 Difference]: Start difference. First operand 76 states and 76 transitions. Second operand 52 states. [2019-01-31 17:22:44,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:44,004 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2019-01-31 17:22:44,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-01-31 17:22:44,004 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 75 [2019-01-31 17:22:44,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:44,005 INFO L225 Difference]: With dead ends: 81 [2019-01-31 17:22:44,005 INFO L226 Difference]: Without dead ends: 80 [2019-01-31 17:22:44,007 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2450 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2626, Invalid=3226, Unknown=0, NotChecked=0, Total=5852 [2019-01-31 17:22:44,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2019-01-31 17:22:44,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2019-01-31 17:22:44,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2019-01-31 17:22:44,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2019-01-31 17:22:44,011 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 75 [2019-01-31 17:22:44,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:44,011 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2019-01-31 17:22:44,011 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2019-01-31 17:22:44,011 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2019-01-31 17:22:44,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-01-31 17:22:44,012 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:44,012 INFO L402 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1] [2019-01-31 17:22:44,012 INFO L423 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:44,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:44,012 INFO L82 PathProgramCache]: Analyzing trace with hash -1813466356, now seen corresponding path program 25 times [2019-01-31 17:22:44,012 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:44,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:44,013 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:44,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:44,013 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:44,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:44,587 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 17:22:44,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:44,587 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:44,587 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:44,587 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:44,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:44,588 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 17:22:44,597 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:44,598 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:22:44,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:44,624 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:44,627 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 17:22:44,627 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:44,635 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 17:22:44,636 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:45,084 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 17:22:45,084 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:45,972 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 17:22:45,991 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:45,991 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 78 [2019-01-31 17:22:45,991 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:45,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2019-01-31 17:22:45,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2019-01-31 17:22:45,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2835, Invalid=3485, Unknown=0, NotChecked=0, Total=6320 [2019-01-31 17:22:45,994 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 54 states. [2019-01-31 17:22:46,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:46,195 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2019-01-31 17:22:46,195 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-01-31 17:22:46,195 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 78 [2019-01-31 17:22:46,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:46,196 INFO L225 Difference]: With dead ends: 84 [2019-01-31 17:22:46,196 INFO L226 Difference]: Without dead ends: 83 [2019-01-31 17:22:46,197 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2652 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2835, Invalid=3485, Unknown=0, NotChecked=0, Total=6320 [2019-01-31 17:22:46,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2019-01-31 17:22:46,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2019-01-31 17:22:46,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-01-31 17:22:46,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 82 transitions. [2019-01-31 17:22:46,201 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 82 transitions. Word has length 78 [2019-01-31 17:22:46,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:46,201 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 82 transitions. [2019-01-31 17:22:46,202 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2019-01-31 17:22:46,202 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 82 transitions. [2019-01-31 17:22:46,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2019-01-31 17:22:46,202 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:46,202 INFO L402 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1] [2019-01-31 17:22:46,203 INFO L423 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:46,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:46,203 INFO L82 PathProgramCache]: Analyzing trace with hash 1417446304, now seen corresponding path program 26 times [2019-01-31 17:22:46,203 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:46,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:46,204 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:46,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:46,204 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:46,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:46,703 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 17:22:46,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:46,703 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:46,703 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:46,704 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:46,704 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:46,704 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 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 17:22:46,712 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:22:46,712 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:22:46,766 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2019-01-31 17:22:46,766 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:46,769 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:46,776 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 17:22:46,776 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:46,790 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 17:22:46,790 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:47,294 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 17:22:47,294 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:48,555 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 17:22:48,574 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:48,574 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 81 [2019-01-31 17:22:48,574 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:48,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2019-01-31 17:22:48,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2019-01-31 17:22:48,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3052, Invalid=3754, Unknown=0, NotChecked=0, Total=6806 [2019-01-31 17:22:48,576 INFO L87 Difference]: Start difference. First operand 82 states and 82 transitions. Second operand 56 states. [2019-01-31 17:22:48,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:48,736 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2019-01-31 17:22:48,737 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-01-31 17:22:48,737 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 81 [2019-01-31 17:22:48,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:48,738 INFO L225 Difference]: With dead ends: 87 [2019-01-31 17:22:48,738 INFO L226 Difference]: Without dead ends: 86 [2019-01-31 17:22:48,739 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2862 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=3052, Invalid=3754, Unknown=0, NotChecked=0, Total=6806 [2019-01-31 17:22:48,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2019-01-31 17:22:48,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2019-01-31 17:22:48,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2019-01-31 17:22:48,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2019-01-31 17:22:48,744 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 81 [2019-01-31 17:22:48,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:48,744 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2019-01-31 17:22:48,744 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2019-01-31 17:22:48,744 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2019-01-31 17:22:48,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-01-31 17:22:48,745 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:48,745 INFO L402 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1] [2019-01-31 17:22:48,745 INFO L423 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:48,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:48,745 INFO L82 PathProgramCache]: Analyzing trace with hash -975570292, now seen corresponding path program 27 times [2019-01-31 17:22:48,745 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:48,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:48,746 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:48,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:48,746 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:48,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:49,416 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 17:22:49,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:49,417 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:49,417 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:49,417 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:49,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:49,417 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 17:22:49,428 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:22:49,428 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:22:49,455 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:22:49,455 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:49,458 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:49,461 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-01-31 17:22:49,461 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:49,470 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 17:22:49,471 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:50,125 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 17:22:50,125 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:51,147 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 17:22:51,166 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:51,166 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 84 [2019-01-31 17:22:51,166 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:51,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2019-01-31 17:22:51,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2019-01-31 17:22:51,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3277, Invalid=4033, Unknown=0, NotChecked=0, Total=7310 [2019-01-31 17:22:51,167 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 58 states. [2019-01-31 17:22:51,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:51,344 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2019-01-31 17:22:51,344 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-01-31 17:22:51,345 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 84 [2019-01-31 17:22:51,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:51,346 INFO L225 Difference]: With dead ends: 90 [2019-01-31 17:22:51,346 INFO L226 Difference]: Without dead ends: 89 [2019-01-31 17:22:51,347 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3080 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=3277, Invalid=4033, Unknown=0, NotChecked=0, Total=7310 [2019-01-31 17:22:51,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-01-31 17:22:51,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2019-01-31 17:22:51,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-01-31 17:22:51,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 88 transitions. [2019-01-31 17:22:51,350 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 88 transitions. Word has length 84 [2019-01-31 17:22:51,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:51,350 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 88 transitions. [2019-01-31 17:22:51,351 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2019-01-31 17:22:51,351 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 88 transitions. [2019-01-31 17:22:51,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-01-31 17:22:51,351 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:51,351 INFO L402 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1] [2019-01-31 17:22:51,352 INFO L423 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:51,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:51,352 INFO L82 PathProgramCache]: Analyzing trace with hash 829164576, now seen corresponding path program 28 times [2019-01-31 17:22:51,352 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:51,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:51,353 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:51,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:51,353 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:51,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:51,883 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 17:22:51,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:51,884 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:51,884 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:51,884 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:51,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:51,884 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 17:22:51,894 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:51,894 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:22:51,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:51,925 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:51,938 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 17:22:51,939 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:51,948 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 17:22:51,948 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:52,898 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 17:22:52,899 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:53,962 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 17:22:53,981 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:53,981 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 87 [2019-01-31 17:22:53,981 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:53,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2019-01-31 17:22:53,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2019-01-31 17:22:53,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3510, Invalid=4322, Unknown=0, NotChecked=0, Total=7832 [2019-01-31 17:22:53,983 INFO L87 Difference]: Start difference. First operand 88 states and 88 transitions. Second operand 60 states. [2019-01-31 17:22:54,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:54,187 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2019-01-31 17:22:54,188 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-01-31 17:22:54,188 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 87 [2019-01-31 17:22:54,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:54,189 INFO L225 Difference]: With dead ends: 93 [2019-01-31 17:22:54,190 INFO L226 Difference]: Without dead ends: 92 [2019-01-31 17:22:54,191 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 17:22:54,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2019-01-31 17:22:54,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2019-01-31 17:22:54,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2019-01-31 17:22:54,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2019-01-31 17:22:54,195 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 87 [2019-01-31 17:22:54,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:54,195 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2019-01-31 17:22:54,195 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2019-01-31 17:22:54,195 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2019-01-31 17:22:54,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2019-01-31 17:22:54,196 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:54,196 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1] [2019-01-31 17:22:54,196 INFO L423 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:54,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:54,197 INFO L82 PathProgramCache]: Analyzing trace with hash 1285005836, now seen corresponding path program 29 times [2019-01-31 17:22:54,197 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:54,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:54,197 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:22:54,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:54,198 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:54,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:54,824 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 17:22:54,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:54,824 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:54,824 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:54,825 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:54,825 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:54,825 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 17:22:54,842 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:22:54,842 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:22:54,907 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2019-01-31 17:22:54,907 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:54,911 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:54,930 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 17:22:54,930 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:54,941 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 17:22:54,942 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:55,555 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 17:22:55,555 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:56,676 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 17:22:56,695 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:56,695 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 90 [2019-01-31 17:22:56,695 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:56,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2019-01-31 17:22:56,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2019-01-31 17:22:56,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3751, Invalid=4621, Unknown=0, NotChecked=0, Total=8372 [2019-01-31 17:22:56,698 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 62 states. [2019-01-31 17:22:56,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:56,896 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2019-01-31 17:22:56,897 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-01-31 17:22:56,897 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 90 [2019-01-31 17:22:56,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:56,898 INFO L225 Difference]: With dead ends: 96 [2019-01-31 17:22:56,898 INFO L226 Difference]: Without dead ends: 95 [2019-01-31 17:22:56,899 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3540 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=3751, Invalid=4621, Unknown=0, NotChecked=0, Total=8372 [2019-01-31 17:22:56,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2019-01-31 17:22:56,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2019-01-31 17:22:56,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2019-01-31 17:22:56,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 94 transitions. [2019-01-31 17:22:56,905 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 94 transitions. Word has length 90 [2019-01-31 17:22:56,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:56,905 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 94 transitions. [2019-01-31 17:22:56,905 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2019-01-31 17:22:56,905 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 94 transitions. [2019-01-31 17:22:56,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-01-31 17:22:56,906 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:56,906 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1] [2019-01-31 17:22:56,906 INFO L423 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:56,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:56,907 INFO L82 PathProgramCache]: Analyzing trace with hash 565392544, now seen corresponding path program 30 times [2019-01-31 17:22:56,907 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:56,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:56,908 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:56,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:56,908 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:56,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:22:57,486 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 17:22:57,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:57,487 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:22:57,487 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:22:57,487 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:22:57,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:22:57,487 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 17:22:57,498 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:22:57,499 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:22:57,529 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:22:57,529 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:22:57,533 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:22:57,538 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 17:22:57,539 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:22:57,548 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:22:57,548 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:22:58,449 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 17:22:58,449 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:22:59,613 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 17:22:59,631 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:22:59,631 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 93 [2019-01-31 17:22:59,631 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:22:59,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2019-01-31 17:22:59,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2019-01-31 17:22:59,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4000, Invalid=4930, Unknown=0, NotChecked=0, Total=8930 [2019-01-31 17:22:59,633 INFO L87 Difference]: Start difference. First operand 94 states and 94 transitions. Second operand 64 states. [2019-01-31 17:22:59,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:22:59,824 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2019-01-31 17:22:59,824 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-01-31 17:22:59,824 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 93 [2019-01-31 17:22:59,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:22:59,825 INFO L225 Difference]: With dead ends: 99 [2019-01-31 17:22:59,826 INFO L226 Difference]: Without dead ends: 98 [2019-01-31 17:22:59,827 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3782 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=4000, Invalid=4930, Unknown=0, NotChecked=0, Total=8930 [2019-01-31 17:22:59,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2019-01-31 17:22:59,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2019-01-31 17:22:59,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2019-01-31 17:22:59,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2019-01-31 17:22:59,831 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 93 [2019-01-31 17:22:59,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:22:59,831 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2019-01-31 17:22:59,831 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2019-01-31 17:22:59,831 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2019-01-31 17:22:59,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2019-01-31 17:22:59,832 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:22:59,832 INFO L402 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1] [2019-01-31 17:22:59,832 INFO L423 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:22:59,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:22:59,832 INFO L82 PathProgramCache]: Analyzing trace with hash -1252415092, now seen corresponding path program 31 times [2019-01-31 17:22:59,832 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:22:59,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:59,833 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:22:59,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:22:59,833 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:22:59,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:23:00,639 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 17:23:00,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:00,640 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:23:00,640 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:23:00,640 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:23:00,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:00,640 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 17:23:00,649 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:23:00,649 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:23:00,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:23:00,681 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:23:00,697 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 17:23:00,697 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:23:00,710 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 17:23:00,711 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:23:01,602 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 17:23:01,602 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:23:03,143 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 17:23:03,161 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:23:03,161 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 96 [2019-01-31 17:23:03,161 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:23:03,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2019-01-31 17:23:03,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2019-01-31 17:23:03,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4257, Invalid=5249, Unknown=0, NotChecked=0, Total=9506 [2019-01-31 17:23:03,163 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 66 states. [2019-01-31 17:23:03,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:23:03,366 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2019-01-31 17:23:03,367 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-01-31 17:23:03,367 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 96 [2019-01-31 17:23:03,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:23:03,368 INFO L225 Difference]: With dead ends: 102 [2019-01-31 17:23:03,368 INFO L226 Difference]: Without dead ends: 101 [2019-01-31 17:23:03,369 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4032 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=4257, Invalid=5249, Unknown=0, NotChecked=0, Total=9506 [2019-01-31 17:23:03,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2019-01-31 17:23:03,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2019-01-31 17:23:03,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2019-01-31 17:23:03,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 100 transitions. [2019-01-31 17:23:03,373 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 100 transitions. Word has length 96 [2019-01-31 17:23:03,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:23:03,374 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 100 transitions. [2019-01-31 17:23:03,374 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2019-01-31 17:23:03,374 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 100 transitions. [2019-01-31 17:23:03,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2019-01-31 17:23:03,375 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:23:03,375 INFO L402 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1] [2019-01-31 17:23:03,375 INFO L423 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:23:03,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:23:03,375 INFO L82 PathProgramCache]: Analyzing trace with hash -317063904, now seen corresponding path program 32 times [2019-01-31 17:23:03,375 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:23:03,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:03,376 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:23:03,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:03,376 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:23:03,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:23:04,048 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 17:23:04,048 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:04,048 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:23:04,048 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:23:04,048 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:23:04,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:04,049 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 17:23:04,057 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:23:04,057 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:23:04,135 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2019-01-31 17:23:04,135 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:23:04,140 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:23:04,164 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 17:23:04,165 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:23:04,255 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 17:23:04,256 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:23:05,041 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 17:23:05,041 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:23:06,428 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 17:23:06,448 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:23:06,448 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 99 [2019-01-31 17:23:06,448 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:23:06,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2019-01-31 17:23:06,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2019-01-31 17:23:06,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4522, Invalid=5578, Unknown=0, NotChecked=0, Total=10100 [2019-01-31 17:23:06,450 INFO L87 Difference]: Start difference. First operand 100 states and 100 transitions. Second operand 68 states. [2019-01-31 17:23:06,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:23:06,708 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2019-01-31 17:23:06,708 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-01-31 17:23:06,708 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 99 [2019-01-31 17:23:06,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:23:06,709 INFO L225 Difference]: With dead ends: 105 [2019-01-31 17:23:06,710 INFO L226 Difference]: Without dead ends: 104 [2019-01-31 17:23:06,711 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 17:23:06,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2019-01-31 17:23:06,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2019-01-31 17:23:06,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2019-01-31 17:23:06,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2019-01-31 17:23:06,716 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 99 [2019-01-31 17:23:06,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:23:06,716 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2019-01-31 17:23:06,716 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2019-01-31 17:23:06,716 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2019-01-31 17:23:06,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2019-01-31 17:23:06,717 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:23:06,717 INFO L402 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1] [2019-01-31 17:23:06,717 INFO L423 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:23:06,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:23:06,717 INFO L82 PathProgramCache]: Analyzing trace with hash -1017638644, now seen corresponding path program 33 times [2019-01-31 17:23:06,718 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:23:06,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:06,718 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:23:06,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:06,719 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:23:06,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:23:07,706 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 17:23:07,706 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:07,706 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:23:07,706 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:23:07,707 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:23:07,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:07,707 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 17:23:07,724 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:23:07,724 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:23:07,755 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:23:07,756 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:23:07,760 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:23:07,777 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 17:23:07,778 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:23:07,824 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 17:23:07,824 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:23:08,873 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 17:23:08,873 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:23:10,297 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 17:23:10,315 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:23:10,316 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 102 [2019-01-31 17:23:10,316 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:23:10,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2019-01-31 17:23:10,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2019-01-31 17:23:10,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4795, Invalid=5917, Unknown=0, NotChecked=0, Total=10712 [2019-01-31 17:23:10,318 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 70 states. [2019-01-31 17:23:10,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:23:10,614 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2019-01-31 17:23:10,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-01-31 17:23:10,614 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 102 [2019-01-31 17:23:10,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:23:10,615 INFO L225 Difference]: With dead ends: 108 [2019-01-31 17:23:10,616 INFO L226 Difference]: Without dead ends: 107 [2019-01-31 17:23:10,617 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4556 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=4795, Invalid=5917, Unknown=0, NotChecked=0, Total=10712 [2019-01-31 17:23:10,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2019-01-31 17:23:10,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2019-01-31 17:23:10,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2019-01-31 17:23:10,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 106 transitions. [2019-01-31 17:23:10,622 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 106 transitions. Word has length 102 [2019-01-31 17:23:10,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:23:10,622 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 106 transitions. [2019-01-31 17:23:10,622 INFO L481 AbstractCegarLoop]: Interpolant automaton has 70 states. [2019-01-31 17:23:10,623 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 106 transitions. [2019-01-31 17:23:10,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2019-01-31 17:23:10,623 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:23:10,623 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1] [2019-01-31 17:23:10,623 INFO L423 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:23:10,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:23:10,624 INFO L82 PathProgramCache]: Analyzing trace with hash 1701340576, now seen corresponding path program 34 times [2019-01-31 17:23:10,624 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:23:10,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:10,624 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:23:10,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:10,624 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:23:10,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:23:11,331 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 17:23:11,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:11,332 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:23:11,332 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:23:11,332 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:23:11,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:11,332 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 17:23:11,340 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:23:11,340 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:23:11,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:23:11,375 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:23:11,379 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-01-31 17:23:11,379 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:23:11,389 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 17:23:11,389 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:23:12,198 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 17:23:12,199 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:23:14,032 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 17:23:14,060 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:23:14,061 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 105 [2019-01-31 17:23:14,061 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:23:14,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 72 states [2019-01-31 17:23:14,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2019-01-31 17:23:14,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5076, Invalid=6266, Unknown=0, NotChecked=0, Total=11342 [2019-01-31 17:23:14,062 INFO L87 Difference]: Start difference. First operand 106 states and 106 transitions. Second operand 72 states. [2019-01-31 17:23:14,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:23:14,259 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2019-01-31 17:23:14,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2019-01-31 17:23:14,259 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 105 [2019-01-31 17:23:14,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:23:14,260 INFO L225 Difference]: With dead ends: 111 [2019-01-31 17:23:14,260 INFO L226 Difference]: Without dead ends: 110 [2019-01-31 17:23:14,261 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 17:23:14,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2019-01-31 17:23:14,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2019-01-31 17:23:14,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2019-01-31 17:23:14,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2019-01-31 17:23:14,264 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 105 [2019-01-31 17:23:14,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:23:14,264 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2019-01-31 17:23:14,264 INFO L481 AbstractCegarLoop]: Interpolant automaton has 72 states. [2019-01-31 17:23:14,264 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2019-01-31 17:23:14,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2019-01-31 17:23:14,265 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:23:14,265 INFO L402 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1] [2019-01-31 17:23:14,265 INFO L423 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:23:14,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:23:14,265 INFO L82 PathProgramCache]: Analyzing trace with hash -271918964, now seen corresponding path program 35 times [2019-01-31 17:23:14,265 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:23:14,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:14,266 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:23:14,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:14,266 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:23:14,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:23:15,021 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 17:23:15,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:15,021 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:23:15,021 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:23:15,021 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:23:15,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:15,021 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 17:23:15,030 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:23:15,031 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:23:15,120 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2019-01-31 17:23:15,120 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:23:15,125 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:23:15,128 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 17:23:15,129 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:23:15,141 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 17:23:15,141 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:23:15,955 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 17:23:15,955 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:23:17,608 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 17:23:17,627 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:23:17,627 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 108 [2019-01-31 17:23:17,627 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:23:17,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2019-01-31 17:23:17,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2019-01-31 17:23:17,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5365, Invalid=6625, Unknown=0, NotChecked=0, Total=11990 [2019-01-31 17:23:17,629 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 74 states. [2019-01-31 17:23:17,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:23:17,968 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2019-01-31 17:23:17,968 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-01-31 17:23:17,969 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 108 [2019-01-31 17:23:17,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:23:17,970 INFO L225 Difference]: With dead ends: 114 [2019-01-31 17:23:17,970 INFO L226 Difference]: Without dead ends: 113 [2019-01-31 17:23:17,971 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5112 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=5365, Invalid=6625, Unknown=0, NotChecked=0, Total=11990 [2019-01-31 17:23:17,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2019-01-31 17:23:17,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 112. [2019-01-31 17:23:17,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2019-01-31 17:23:17,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 112 transitions. [2019-01-31 17:23:17,975 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 112 transitions. Word has length 108 [2019-01-31 17:23:17,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:23:17,975 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 112 transitions. [2019-01-31 17:23:17,975 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2019-01-31 17:23:17,976 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 112 transitions. [2019-01-31 17:23:17,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2019-01-31 17:23:17,976 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:23:17,976 INFO L402 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1] [2019-01-31 17:23:17,976 INFO L423 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:23:17,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:23:17,976 INFO L82 PathProgramCache]: Analyzing trace with hash -429494752, now seen corresponding path program 36 times [2019-01-31 17:23:17,977 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:23:17,977 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:17,977 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:23:17,977 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:17,977 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:23:17,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:23:19,347 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 17:23:19,347 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:19,348 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:23:19,348 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:23:19,348 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:23:19,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:19,348 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 17:23:19,357 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:23:19,357 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:23:19,391 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:23:19,392 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:23:19,395 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:23:19,402 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 17:23:19,402 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:23:19,411 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 17:23:19,411 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:23:20,366 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 17:23:20,366 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:23:22,110 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 17:23:22,128 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:23:22,128 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 111 [2019-01-31 17:23:22,128 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:23:22,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 76 states [2019-01-31 17:23:22,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2019-01-31 17:23:22,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5662, Invalid=6994, Unknown=0, NotChecked=0, Total=12656 [2019-01-31 17:23:22,130 INFO L87 Difference]: Start difference. First operand 112 states and 112 transitions. Second operand 76 states. [2019-01-31 17:23:22,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:23:22,366 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2019-01-31 17:23:22,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-01-31 17:23:22,367 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 111 [2019-01-31 17:23:22,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:23:22,368 INFO L225 Difference]: With dead ends: 117 [2019-01-31 17:23:22,368 INFO L226 Difference]: Without dead ends: 116 [2019-01-31 17:23:22,369 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 17:23:22,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2019-01-31 17:23:22,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2019-01-31 17:23:22,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2019-01-31 17:23:22,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2019-01-31 17:23:22,372 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 111 [2019-01-31 17:23:22,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:23:22,372 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2019-01-31 17:23:22,372 INFO L481 AbstractCegarLoop]: Interpolant automaton has 76 states. [2019-01-31 17:23:22,372 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2019-01-31 17:23:22,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2019-01-31 17:23:22,373 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:23:22,373 INFO L402 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1] [2019-01-31 17:23:22,373 INFO L423 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:23:22,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:23:22,374 INFO L82 PathProgramCache]: Analyzing trace with hash -370540532, now seen corresponding path program 37 times [2019-01-31 17:23:22,374 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:23:22,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:22,375 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:23:22,375 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:22,375 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:23:22,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:23:23,158 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 17:23:23,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:23,159 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:23:23,159 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:23:23,159 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:23:23,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:23,160 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 17:23:23,171 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:23:23,171 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:23:23,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:23:23,209 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:23:23,212 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 17:23:23,213 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:23:23,221 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:23:23,221 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:23:24,305 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 17:23:24,305 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:23:26,081 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 17:23:26,100 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:23:26,100 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 114 [2019-01-31 17:23:26,100 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:23:26,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 78 states [2019-01-31 17:23:26,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2019-01-31 17:23:26,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5967, Invalid=7373, Unknown=0, NotChecked=0, Total=13340 [2019-01-31 17:23:26,102 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 78 states. [2019-01-31 17:23:26,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:23:26,408 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2019-01-31 17:23:26,408 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2019-01-31 17:23:26,408 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 114 [2019-01-31 17:23:26,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:23:26,410 INFO L225 Difference]: With dead ends: 120 [2019-01-31 17:23:26,410 INFO L226 Difference]: Without dead ends: 119 [2019-01-31 17:23:26,411 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5700 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=5967, Invalid=7373, Unknown=0, NotChecked=0, Total=13340 [2019-01-31 17:23:26,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2019-01-31 17:23:26,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2019-01-31 17:23:26,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2019-01-31 17:23:26,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 118 transitions. [2019-01-31 17:23:26,415 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 118 transitions. Word has length 114 [2019-01-31 17:23:26,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:23:26,415 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 118 transitions. [2019-01-31 17:23:26,415 INFO L481 AbstractCegarLoop]: Interpolant automaton has 78 states. [2019-01-31 17:23:26,415 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 118 transitions. [2019-01-31 17:23:26,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2019-01-31 17:23:26,416 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:23:26,416 INFO L402 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1] [2019-01-31 17:23:26,416 INFO L423 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:23:26,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:23:26,416 INFO L82 PathProgramCache]: Analyzing trace with hash -706996576, now seen corresponding path program 38 times [2019-01-31 17:23:26,416 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:23:26,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:26,417 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:23:26,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:26,417 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:23:26,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:23:28,543 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 17:23:28,544 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:28,544 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:23:28,544 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:23:28,544 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:23:28,544 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:28,544 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 17:23:28,552 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:23:28,552 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:23:28,657 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2019-01-31 17:23:28,657 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:23:28,661 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:23:28,667 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 17:23:28,667 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:23:28,676 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 17:23:28,676 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:23:29,766 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 17:23:29,767 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:23:31,764 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 17:23:31,802 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:23:31,802 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 117 [2019-01-31 17:23:31,802 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:23:31,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2019-01-31 17:23:31,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2019-01-31 17:23:31,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6280, Invalid=7762, Unknown=0, NotChecked=0, Total=14042 [2019-01-31 17:23:31,805 INFO L87 Difference]: Start difference. First operand 118 states and 118 transitions. Second operand 80 states. [2019-01-31 17:23:32,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:23:32,312 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2019-01-31 17:23:32,312 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2019-01-31 17:23:32,313 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 117 [2019-01-31 17:23:32,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:23:32,314 INFO L225 Difference]: With dead ends: 123 [2019-01-31 17:23:32,314 INFO L226 Difference]: Without dead ends: 122 [2019-01-31 17:23:32,315 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6006 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=6280, Invalid=7762, Unknown=0, NotChecked=0, Total=14042 [2019-01-31 17:23:32,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2019-01-31 17:23:32,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2019-01-31 17:23:32,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2019-01-31 17:23:32,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2019-01-31 17:23:32,320 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 117 [2019-01-31 17:23:32,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:23:32,320 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2019-01-31 17:23:32,320 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2019-01-31 17:23:32,321 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2019-01-31 17:23:32,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2019-01-31 17:23:32,321 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:23:32,321 INFO L402 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1] [2019-01-31 17:23:32,321 INFO L423 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:23:32,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:23:32,322 INFO L82 PathProgramCache]: Analyzing trace with hash 384665484, now seen corresponding path program 39 times [2019-01-31 17:23:32,322 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:23:32,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:32,323 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:23:32,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:32,323 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:23:32,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:23:33,317 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 17:23:33,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:33,318 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:23:33,318 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:23:33,318 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:23:33,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:33,318 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 17:23:33,329 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:23:33,329 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:23:33,375 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:23:33,375 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:23:33,379 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:23:33,395 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 17:23:33,396 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:23:33,496 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 17:23:33,496 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:23:35,026 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 17:23:35,026 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:23:37,003 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 17:23:37,031 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:23:37,031 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 120 [2019-01-31 17:23:37,031 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:23:37,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 82 states [2019-01-31 17:23:37,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2019-01-31 17:23:37,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6601, Invalid=8161, Unknown=0, NotChecked=0, Total=14762 [2019-01-31 17:23:37,033 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand 82 states. [2019-01-31 17:23:37,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:23:37,333 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2019-01-31 17:23:37,333 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-01-31 17:23:37,333 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 120 [2019-01-31 17:23:37,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:23:37,334 INFO L225 Difference]: With dead ends: 126 [2019-01-31 17:23:37,335 INFO L226 Difference]: Without dead ends: 125 [2019-01-31 17:23:37,335 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6320 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=6601, Invalid=8161, Unknown=0, NotChecked=0, Total=14762 [2019-01-31 17:23:37,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2019-01-31 17:23:37,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2019-01-31 17:23:37,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2019-01-31 17:23:37,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 124 transitions. [2019-01-31 17:23:37,340 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 124 transitions. Word has length 120 [2019-01-31 17:23:37,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:23:37,341 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 124 transitions. [2019-01-31 17:23:37,341 INFO L481 AbstractCegarLoop]: Interpolant automaton has 82 states. [2019-01-31 17:23:37,341 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 124 transitions. [2019-01-31 17:23:37,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2019-01-31 17:23:37,342 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:23:37,342 INFO L402 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1] [2019-01-31 17:23:37,342 INFO L423 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:23:37,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:23:37,342 INFO L82 PathProgramCache]: Analyzing trace with hash 596729632, now seen corresponding path program 40 times [2019-01-31 17:23:37,342 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:23:37,343 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:37,343 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:23:37,343 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:37,343 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:23:37,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:23:38,283 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 17:23:38,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:38,283 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:23:38,283 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:23:38,283 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:23:38,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:38,283 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 17:23:38,291 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:23:38,291 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:23:38,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:23:38,336 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:23:38,339 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 17:23:38,339 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:23:38,348 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 17:23:38,348 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:23:39,657 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 17:23:39,658 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:23:41,837 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 17:23:41,869 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:23:41,870 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 123 [2019-01-31 17:23:41,870 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:23:41,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 84 states [2019-01-31 17:23:41,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2019-01-31 17:23:41,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6930, Invalid=8570, Unknown=0, NotChecked=0, Total=15500 [2019-01-31 17:23:41,872 INFO L87 Difference]: Start difference. First operand 124 states and 124 transitions. Second operand 84 states. [2019-01-31 17:23:42,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:23:42,303 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2019-01-31 17:23:42,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2019-01-31 17:23:42,304 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 123 [2019-01-31 17:23:42,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:23:42,305 INFO L225 Difference]: With dead ends: 129 [2019-01-31 17:23:42,306 INFO L226 Difference]: Without dead ends: 128 [2019-01-31 17:23:42,307 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6642 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=6930, Invalid=8570, Unknown=0, NotChecked=0, Total=15500 [2019-01-31 17:23:42,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2019-01-31 17:23:42,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2019-01-31 17:23:42,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2019-01-31 17:23:42,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2019-01-31 17:23:42,312 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 123 [2019-01-31 17:23:42,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:23:42,313 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2019-01-31 17:23:42,313 INFO L481 AbstractCegarLoop]: Interpolant automaton has 84 states. [2019-01-31 17:23:42,313 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2019-01-31 17:23:42,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2019-01-31 17:23:42,313 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:23:42,314 INFO L402 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1] [2019-01-31 17:23:42,314 INFO L423 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:23:42,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:23:42,314 INFO L82 PathProgramCache]: Analyzing trace with hash 302870284, now seen corresponding path program 41 times [2019-01-31 17:23:42,314 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:23:42,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:42,315 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:23:42,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:42,315 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:23:42,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:23:45,287 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 17:23:45,288 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:45,288 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:23:45,288 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:23:45,288 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:23:45,288 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:45,288 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 17:23:45,299 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:23:45,300 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:23:45,419 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2019-01-31 17:23:45,419 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:23:45,423 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:23:45,436 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 17:23:45,437 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:23:45,444 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 17:23:45,445 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:23:46,552 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 17:23:46,552 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:23:48,778 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 17:23:48,797 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:23:48,797 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 126 [2019-01-31 17:23:48,797 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:23:48,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2019-01-31 17:23:48,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2019-01-31 17:23:48,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7267, Invalid=8989, Unknown=0, NotChecked=0, Total=16256 [2019-01-31 17:23:48,799 INFO L87 Difference]: Start difference. First operand 127 states and 127 transitions. Second operand 86 states. [2019-01-31 17:23:49,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:23:49,205 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2019-01-31 17:23:49,206 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-01-31 17:23:49,206 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 126 [2019-01-31 17:23:49,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:23:49,208 INFO L225 Difference]: With dead ends: 132 [2019-01-31 17:23:49,208 INFO L226 Difference]: Without dead ends: 131 [2019-01-31 17:23:49,210 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6972 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=7267, Invalid=8989, Unknown=0, NotChecked=0, Total=16256 [2019-01-31 17:23:49,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2019-01-31 17:23:49,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 130. [2019-01-31 17:23:49,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2019-01-31 17:23:49,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 130 transitions. [2019-01-31 17:23:49,215 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 130 transitions. Word has length 126 [2019-01-31 17:23:49,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:23:49,216 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 130 transitions. [2019-01-31 17:23:49,216 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2019-01-31 17:23:49,216 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 130 transitions. [2019-01-31 17:23:49,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2019-01-31 17:23:49,217 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:23:49,217 INFO L402 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1] [2019-01-31 17:23:49,217 INFO L423 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:23:49,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:23:49,218 INFO L82 PathProgramCache]: Analyzing trace with hash -917616736, now seen corresponding path program 42 times [2019-01-31 17:23:49,218 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:23:49,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:49,218 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:23:49,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:49,219 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:23:49,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:23:50,349 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 17:23:50,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:50,349 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:23:50,349 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:23:50,349 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:23:50,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:50,349 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 17:23:50,360 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:23:50,360 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:23:50,403 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:23:50,403 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:23:50,408 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:23:50,410 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 17:23:50,411 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:23:50,420 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 17:23:50,420 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:23:51,539 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 17:23:51,539 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:23:53,959 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 17:23:53,978 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:23:53,978 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 129 [2019-01-31 17:23:53,978 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:23:53,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 88 states [2019-01-31 17:23:53,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2019-01-31 17:23:53,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7612, Invalid=9418, Unknown=0, NotChecked=0, Total=17030 [2019-01-31 17:23:53,980 INFO L87 Difference]: Start difference. First operand 130 states and 130 transitions. Second operand 88 states. [2019-01-31 17:23:54,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:23:54,570 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2019-01-31 17:23:54,570 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2019-01-31 17:23:54,570 INFO L78 Accepts]: Start accepts. Automaton has 88 states. Word has length 129 [2019-01-31 17:23:54,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:23:54,571 INFO L225 Difference]: With dead ends: 135 [2019-01-31 17:23:54,571 INFO L226 Difference]: Without dead ends: 134 [2019-01-31 17:23:54,572 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7310 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=7612, Invalid=9418, Unknown=0, NotChecked=0, Total=17030 [2019-01-31 17:23:54,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2019-01-31 17:23:54,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2019-01-31 17:23:54,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2019-01-31 17:23:54,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 133 transitions. [2019-01-31 17:23:54,578 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 133 transitions. Word has length 129 [2019-01-31 17:23:54,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:23:54,578 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 133 transitions. [2019-01-31 17:23:54,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has 88 states. [2019-01-31 17:23:54,578 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 133 transitions. [2019-01-31 17:23:54,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2019-01-31 17:23:54,579 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:23:54,579 INFO L402 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1] [2019-01-31 17:23:54,579 INFO L423 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:23:54,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:23:54,580 INFO L82 PathProgramCache]: Analyzing trace with hash 746698380, now seen corresponding path program 43 times [2019-01-31 17:23:54,580 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:23:54,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:54,581 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:23:54,581 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:23:54,581 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:23:54,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:23:56,003 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 17:23:56,003 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:56,003 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:23:56,003 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:23:56,004 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:23:56,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:23:56,004 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 17:23:56,013 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:23:56,013 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:23:56,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:23:56,060 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:23:56,064 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-01-31 17:23:56,064 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:23:56,075 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:23:56,076 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:23:57,245 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 17:23:57,245 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:23:59,910 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 17:23:59,929 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:23:59,929 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 132 [2019-01-31 17:23:59,930 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:23:59,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 90 states [2019-01-31 17:23:59,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2019-01-31 17:23:59,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7965, Invalid=9857, Unknown=0, NotChecked=0, Total=17822 [2019-01-31 17:23:59,932 INFO L87 Difference]: Start difference. First operand 133 states and 133 transitions. Second operand 90 states. [2019-01-31 17:24:00,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:24:00,197 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2019-01-31 17:24:00,197 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-01-31 17:24:00,197 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 132 [2019-01-31 17:24:00,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:24:00,198 INFO L225 Difference]: With dead ends: 138 [2019-01-31 17:24:00,198 INFO L226 Difference]: Without dead ends: 137 [2019-01-31 17:24:00,200 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7656 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=7965, Invalid=9857, Unknown=0, NotChecked=0, Total=17822 [2019-01-31 17:24:00,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2019-01-31 17:24:00,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2019-01-31 17:24:00,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2019-01-31 17:24:00,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 136 transitions. [2019-01-31 17:24:00,204 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 136 transitions. Word has length 132 [2019-01-31 17:24:00,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:24:00,204 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 136 transitions. [2019-01-31 17:24:00,204 INFO L481 AbstractCegarLoop]: Interpolant automaton has 90 states. [2019-01-31 17:24:00,205 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 136 transitions. [2019-01-31 17:24:00,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2019-01-31 17:24:00,205 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:24:00,205 INFO L402 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1] [2019-01-31 17:24:00,205 INFO L423 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:24:00,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:24:00,206 INFO L82 PathProgramCache]: Analyzing trace with hash 1255854112, now seen corresponding path program 44 times [2019-01-31 17:24:00,206 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:24:00,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:24:00,206 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:24:00,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:24:00,206 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:24:00,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:24:02,362 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 17:24:02,362 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:24:02,362 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:24:02,362 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:24:02,362 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:24:02,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:24:02,363 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 17:24:02,372 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:24:02,372 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:24:02,499 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2019-01-31 17:24:02,499 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:24:02,504 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:24:02,508 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 17:24:02,508 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:24:02,518 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 17:24:02,518 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:24:03,806 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 17:24:03,806 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:24:06,572 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 17:24:06,592 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:24:06,593 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 135 [2019-01-31 17:24:06,593 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:24:06,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2019-01-31 17:24:06,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2019-01-31 17:24:06,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8326, Invalid=10306, Unknown=0, NotChecked=0, Total=18632 [2019-01-31 17:24:06,594 INFO L87 Difference]: Start difference. First operand 136 states and 136 transitions. Second operand 92 states. [2019-01-31 17:24:06,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:24:06,875 INFO L93 Difference]: Finished difference Result 141 states and 141 transitions. [2019-01-31 17:24:06,876 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-01-31 17:24:06,877 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 135 [2019-01-31 17:24:06,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:24:06,878 INFO L225 Difference]: With dead ends: 141 [2019-01-31 17:24:06,878 INFO L226 Difference]: Without dead ends: 140 [2019-01-31 17:24:06,879 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8010 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=8326, Invalid=10306, Unknown=0, NotChecked=0, Total=18632 [2019-01-31 17:24:06,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2019-01-31 17:24:06,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2019-01-31 17:24:06,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2019-01-31 17:24:06,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 139 transitions. [2019-01-31 17:24:06,884 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 139 transitions. Word has length 135 [2019-01-31 17:24:06,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:24:06,885 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 139 transitions. [2019-01-31 17:24:06,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2019-01-31 17:24:06,885 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 139 transitions. [2019-01-31 17:24:06,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2019-01-31 17:24:06,885 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:24:06,886 INFO L402 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1] [2019-01-31 17:24:06,886 INFO L423 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:24:06,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:24:06,886 INFO L82 PathProgramCache]: Analyzing trace with hash -310223348, now seen corresponding path program 45 times [2019-01-31 17:24:06,886 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:24:06,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:24:06,887 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:24:06,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:24:06,887 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:24:06,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:24:08,036 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 17:24:08,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:24:08,037 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:24:08,037 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:24:08,037 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:24:08,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:24:08,037 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 17:24:08,046 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:24:08,046 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:24:08,091 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:24:08,091 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:24:08,096 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:24:08,111 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 17:24:08,112 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:24:08,193 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 17:24:08,194 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:24:09,586 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 17:24:09,587 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:24:12,228 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 17:24:12,246 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:24:12,246 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 138 [2019-01-31 17:24:12,246 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:24:12,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 94 states [2019-01-31 17:24:12,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2019-01-31 17:24:12,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8695, Invalid=10765, Unknown=0, NotChecked=0, Total=19460 [2019-01-31 17:24:12,248 INFO L87 Difference]: Start difference. First operand 139 states and 139 transitions. Second operand 94 states. [2019-01-31 17:24:12,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:24:12,683 INFO L93 Difference]: Finished difference Result 144 states and 144 transitions. [2019-01-31 17:24:12,684 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2019-01-31 17:24:12,684 INFO L78 Accepts]: Start accepts. Automaton has 94 states. Word has length 138 [2019-01-31 17:24:12,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:24:12,685 INFO L225 Difference]: With dead ends: 144 [2019-01-31 17:24:12,685 INFO L226 Difference]: Without dead ends: 143 [2019-01-31 17:24:12,687 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8372 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=8695, Invalid=10765, Unknown=0, NotChecked=0, Total=19460 [2019-01-31 17:24:12,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2019-01-31 17:24:12,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 142. [2019-01-31 17:24:12,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2019-01-31 17:24:12,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 142 transitions. [2019-01-31 17:24:12,691 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 142 transitions. Word has length 138 [2019-01-31 17:24:12,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:24:12,692 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 142 transitions. [2019-01-31 17:24:12,692 INFO L481 AbstractCegarLoop]: Interpolant automaton has 94 states. [2019-01-31 17:24:12,692 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 142 transitions. [2019-01-31 17:24:12,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2019-01-31 17:24:12,693 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:24:12,693 INFO L402 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1] [2019-01-31 17:24:12,693 INFO L423 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:24:12,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:24:12,693 INFO L82 PathProgramCache]: Analyzing trace with hash 905902240, now seen corresponding path program 46 times [2019-01-31 17:24:12,693 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:24:12,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:24:12,694 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:24:12,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:24:12,694 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:24:12,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:24:14,305 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 17:24:14,306 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:24:14,306 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:24:14,306 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:24:14,306 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:24:14,306 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:24:14,306 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 17:24:14,315 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:24:14,315 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:24:14,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:24:14,363 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:24:14,366 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 17:24:14,367 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:24:14,378 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 17:24:14,378 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:24:16,017 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 17:24:16,017 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:24:19,007 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 17:24:19,026 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:24:19,026 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 141 [2019-01-31 17:24:19,026 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:24:19,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2019-01-31 17:24:19,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2019-01-31 17:24:19,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9072, Invalid=11234, Unknown=0, NotChecked=0, Total=20306 [2019-01-31 17:24:19,028 INFO L87 Difference]: Start difference. First operand 142 states and 142 transitions. Second operand 96 states. [2019-01-31 17:24:19,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:24:19,389 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2019-01-31 17:24:19,389 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2019-01-31 17:24:19,389 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 141 [2019-01-31 17:24:19,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:24:19,390 INFO L225 Difference]: With dead ends: 147 [2019-01-31 17:24:19,390 INFO L226 Difference]: Without dead ends: 146 [2019-01-31 17:24:19,391 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8742 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=9072, Invalid=11234, Unknown=0, NotChecked=0, Total=20306 [2019-01-31 17:24:19,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2019-01-31 17:24:19,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2019-01-31 17:24:19,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2019-01-31 17:24:19,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 145 transitions. [2019-01-31 17:24:19,397 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 145 transitions. Word has length 141 [2019-01-31 17:24:19,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:24:19,397 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 145 transitions. [2019-01-31 17:24:19,397 INFO L481 AbstractCegarLoop]: Interpolant automaton has 96 states. [2019-01-31 17:24:19,397 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 145 transitions. [2019-01-31 17:24:19,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2019-01-31 17:24:19,398 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:24:19,398 INFO L402 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1] [2019-01-31 17:24:19,398 INFO L423 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:24:19,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:24:19,399 INFO L82 PathProgramCache]: Analyzing trace with hash -1840814708, now seen corresponding path program 47 times [2019-01-31 17:24:19,399 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:24:19,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:24:19,399 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:24:19,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:24:19,400 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:24:19,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:24:20,622 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 17:24:20,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:24:20,622 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:24:20,622 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:24:20,623 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:24:20,623 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:24:20,623 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 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 17:24:20,631 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:24:20,631 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:24:20,773 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2019-01-31 17:24:20,773 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:24:20,778 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:24:20,794 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 17:24:20,794 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:24:20,882 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 17:24:20,882 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:24:22,273 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 17:24:22,273 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:24:25,365 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 17:24:25,384 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:24:25,384 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 144 [2019-01-31 17:24:25,384 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:24:25,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2019-01-31 17:24:25,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2019-01-31 17:24:25,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9457, Invalid=11713, Unknown=0, NotChecked=0, Total=21170 [2019-01-31 17:24:25,386 INFO L87 Difference]: Start difference. First operand 145 states and 145 transitions. Second operand 98 states. [2019-01-31 17:24:25,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:24:25,750 INFO L93 Difference]: Finished difference Result 150 states and 150 transitions. [2019-01-31 17:24:25,750 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2019-01-31 17:24:25,750 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 144 [2019-01-31 17:24:25,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:24:25,752 INFO L225 Difference]: With dead ends: 150 [2019-01-31 17:24:25,752 INFO L226 Difference]: Without dead ends: 149 [2019-01-31 17:24:25,753 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 17:24:25,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2019-01-31 17:24:25,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 148. [2019-01-31 17:24:25,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2019-01-31 17:24:25,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 148 transitions. [2019-01-31 17:24:25,759 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 148 transitions. Word has length 144 [2019-01-31 17:24:25,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:24:25,759 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 148 transitions. [2019-01-31 17:24:25,759 INFO L481 AbstractCegarLoop]: Interpolant automaton has 98 states. [2019-01-31 17:24:25,759 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 148 transitions. [2019-01-31 17:24:25,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2019-01-31 17:24:25,760 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:24:25,760 INFO L402 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1] [2019-01-31 17:24:25,760 INFO L423 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:24:25,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:24:25,761 INFO L82 PathProgramCache]: Analyzing trace with hash -1568489184, now seen corresponding path program 48 times [2019-01-31 17:24:25,761 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:24:25,761 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:24:25,761 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:24:25,761 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:24:25,762 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:24:25,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:24:27,128 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 17:24:27,128 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:24:27,128 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:24:27,128 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:24:27,128 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:24:27,128 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:24:27,128 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 17:24:27,138 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:24:27,138 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:24:27,184 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:24:27,184 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:24:27,190 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:24:27,209 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 17:24:27,209 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:24:27,311 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 17:24:27,311 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:24:28,828 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 17:24:28,828 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:24:32,157 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 17:24:32,175 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:24:32,176 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 147 [2019-01-31 17:24:32,176 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:24:32,176 INFO L459 AbstractCegarLoop]: Interpolant automaton has 100 states [2019-01-31 17:24:32,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2019-01-31 17:24:32,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9850, Invalid=12202, Unknown=0, NotChecked=0, Total=22052 [2019-01-31 17:24:32,178 INFO L87 Difference]: Start difference. First operand 148 states and 148 transitions. Second operand 100 states. [2019-01-31 17:24:32,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:24:32,646 INFO L93 Difference]: Finished difference Result 153 states and 153 transitions. [2019-01-31 17:24:32,646 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2019-01-31 17:24:32,646 INFO L78 Accepts]: Start accepts. Automaton has 100 states. Word has length 147 [2019-01-31 17:24:32,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:24:32,647 INFO L225 Difference]: With dead ends: 153 [2019-01-31 17:24:32,647 INFO L226 Difference]: Without dead ends: 152 [2019-01-31 17:24:32,649 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9506 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=9850, Invalid=12202, Unknown=0, NotChecked=0, Total=22052 [2019-01-31 17:24:32,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2019-01-31 17:24:32,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 151. [2019-01-31 17:24:32,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2019-01-31 17:24:32,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 151 transitions. [2019-01-31 17:24:32,653 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 151 transitions. Word has length 147 [2019-01-31 17:24:32,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:24:32,653 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 151 transitions. [2019-01-31 17:24:32,653 INFO L481 AbstractCegarLoop]: Interpolant automaton has 100 states. [2019-01-31 17:24:32,653 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 151 transitions. [2019-01-31 17:24:32,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2019-01-31 17:24:32,654 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:24:32,654 INFO L402 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1] [2019-01-31 17:24:32,654 INFO L423 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:24:32,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:24:32,654 INFO L82 PathProgramCache]: Analyzing trace with hash -1912025844, now seen corresponding path program 49 times [2019-01-31 17:24:32,654 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:24:32,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:24:32,655 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:24:32,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:24:32,655 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:24:32,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:24:34,038 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 17:24:34,039 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:24:34,039 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:24:34,039 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:24:34,039 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:24:34,039 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:24:34,039 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 17:24:34,048 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:24:34,048 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:24:34,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:24:34,103 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:24:34,119 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 17:24:34,120 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:24:34,214 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 17:24:34,215 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:24:36,282 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 17:24:36,282 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:24:39,401 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 17:24:39,421 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:24:39,421 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 150 [2019-01-31 17:24:39,422 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:24:39,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2019-01-31 17:24:39,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2019-01-31 17:24:39,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10251, Invalid=12701, Unknown=0, NotChecked=0, Total=22952 [2019-01-31 17:24:39,424 INFO L87 Difference]: Start difference. First operand 151 states and 151 transitions. Second operand 102 states. [2019-01-31 17:24:39,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:24:39,846 INFO L93 Difference]: Finished difference Result 156 states and 156 transitions. [2019-01-31 17:24:39,847 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2019-01-31 17:24:39,847 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 150 [2019-01-31 17:24:39,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:24:39,848 INFO L225 Difference]: With dead ends: 156 [2019-01-31 17:24:39,848 INFO L226 Difference]: Without dead ends: 155 [2019-01-31 17:24:39,849 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 17:24:39,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2019-01-31 17:24:39,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2019-01-31 17:24:39,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2019-01-31 17:24:39,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 154 transitions. [2019-01-31 17:24:39,853 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 154 transitions. Word has length 150 [2019-01-31 17:24:39,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:24:39,853 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 154 transitions. [2019-01-31 17:24:39,853 INFO L481 AbstractCegarLoop]: Interpolant automaton has 102 states. [2019-01-31 17:24:39,853 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 154 transitions. [2019-01-31 17:24:39,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2019-01-31 17:24:39,854 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:24:39,854 INFO L402 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1] [2019-01-31 17:24:39,854 INFO L423 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:24:39,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:24:39,855 INFO L82 PathProgramCache]: Analyzing trace with hash -1305597536, now seen corresponding path program 50 times [2019-01-31 17:24:39,855 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:24:39,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:24:39,856 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:24:39,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:24:39,856 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:24:39,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:24:41,452 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 17:24:41,452 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:24:41,452 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:24:41,452 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:24:41,452 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:24:41,453 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:24:41,453 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 17:24:41,465 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:24:41,465 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:24:41,637 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2019-01-31 17:24:41,637 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:24:41,643 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:24:41,645 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 17:24:41,646 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:24:41,658 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 17:24:41,658 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:24:43,224 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 17:24:43,224 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:24:46,654 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 17:24:46,674 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:24:46,674 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 151 [2019-01-31 17:24:46,674 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:24:46,675 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2019-01-31 17:24:46,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2019-01-31 17:24:46,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10353, Invalid=12903, Unknown=0, NotChecked=0, Total=23256 [2019-01-31 17:24:46,677 INFO L87 Difference]: Start difference. First operand 154 states and 154 transitions. Second operand 104 states. [2019-01-31 17:24:47,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:24:47,037 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2019-01-31 17:24:47,037 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2019-01-31 17:24:47,037 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 153 [2019-01-31 17:24:47,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:24:47,039 INFO L225 Difference]: With dead ends: 159 [2019-01-31 17:24:47,039 INFO L226 Difference]: Without dead ends: 158 [2019-01-31 17:24:47,040 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 202 SyntacticMatches, 2 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10397 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=10353, Invalid=12903, Unknown=0, NotChecked=0, Total=23256 [2019-01-31 17:24:47,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2019-01-31 17:24:47,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 157. [2019-01-31 17:24:47,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2019-01-31 17:24:47,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 157 transitions. [2019-01-31 17:24:47,043 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 157 transitions. Word has length 153 [2019-01-31 17:24:47,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:24:47,044 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 157 transitions. [2019-01-31 17:24:47,044 INFO L481 AbstractCegarLoop]: Interpolant automaton has 104 states. [2019-01-31 17:24:47,044 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 157 transitions. [2019-01-31 17:24:47,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2019-01-31 17:24:47,045 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:24:47,045 INFO L402 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1] [2019-01-31 17:24:47,045 INFO L423 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:24:47,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:24:47,045 INFO L82 PathProgramCache]: Analyzing trace with hash 167679116, now seen corresponding path program 51 times [2019-01-31 17:24:47,045 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:24:47,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:24:47,046 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:24:47,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:24:47,046 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:24:47,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:24:48,643 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 17:24:48,643 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:24:48,643 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:24:48,644 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:24:48,644 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:24:48,644 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:24:48,644 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 17:24:48,652 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:24:48,653 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:24:48,718 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:24:48,718 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:24:48,725 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:24:48,743 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 17:24:48,743 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:24:48,842 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 17:24:48,843 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:24:51,596 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 17:24:51,596 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:24:54,904 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 17:24:54,923 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:24:54,923 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 152 [2019-01-31 17:24:54,923 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:24:54,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 106 states [2019-01-31 17:24:54,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2019-01-31 17:24:54,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10455, Invalid=13107, Unknown=0, NotChecked=0, Total=23562 [2019-01-31 17:24:54,925 INFO L87 Difference]: Start difference. First operand 157 states and 157 transitions. Second operand 106 states. [2019-01-31 17:24:55,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:24:55,317 INFO L93 Difference]: Finished difference Result 162 states and 162 transitions. [2019-01-31 17:24:55,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2019-01-31 17:24:55,317 INFO L78 Accepts]: Start accepts. Automaton has 106 states. Word has length 156 [2019-01-31 17:24:55,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:24:55,318 INFO L225 Difference]: With dead ends: 162 [2019-01-31 17:24:55,319 INFO L226 Difference]: Without dead ends: 161 [2019-01-31 17:24:55,320 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 206 SyntacticMatches, 4 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10894 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=10455, Invalid=13107, Unknown=0, NotChecked=0, Total=23562 [2019-01-31 17:24:55,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2019-01-31 17:24:55,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 160. [2019-01-31 17:24:55,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2019-01-31 17:24:55,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 160 transitions. [2019-01-31 17:24:55,324 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 160 transitions. Word has length 156 [2019-01-31 17:24:55,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:24:55,325 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 160 transitions. [2019-01-31 17:24:55,325 INFO L481 AbstractCegarLoop]: Interpolant automaton has 106 states. [2019-01-31 17:24:55,325 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 160 transitions. [2019-01-31 17:24:55,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2019-01-31 17:24:55,325 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:24:55,326 INFO L402 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1] [2019-01-31 17:24:55,326 INFO L423 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:24:55,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:24:55,326 INFO L82 PathProgramCache]: Analyzing trace with hash 281621024, now seen corresponding path program 52 times [2019-01-31 17:24:55,326 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:24:55,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:24:55,327 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:24:55,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:24:55,327 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:24:55,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:24:56,899 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 17:24:56,899 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:24:56,899 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:24:56,899 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:24:56,900 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:24:56,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:24:56,900 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 17:24:56,908 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:24:56,909 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:24:56,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:24:56,961 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:24:56,969 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 17:24:56,970 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:24:56,979 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 17:24:56,980 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:24:58,663 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 17:24:58,663 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:25:02,261 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 17:25:02,279 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:25:02,280 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 153 [2019-01-31 17:25:02,280 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:25:02,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 108 states [2019-01-31 17:25:02,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2019-01-31 17:25:02,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10557, Invalid=13313, Unknown=0, NotChecked=0, Total=23870 [2019-01-31 17:25:02,282 INFO L87 Difference]: Start difference. First operand 160 states and 160 transitions. Second operand 108 states. [2019-01-31 17:25:02,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:25:02,724 INFO L93 Difference]: Finished difference Result 165 states and 165 transitions. [2019-01-31 17:25:02,724 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2019-01-31 17:25:02,724 INFO L78 Accepts]: Start accepts. Automaton has 108 states. Word has length 159 [2019-01-31 17:25:02,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:25:02,726 INFO L225 Difference]: With dead ends: 165 [2019-01-31 17:25:02,726 INFO L226 Difference]: Without dead ends: 164 [2019-01-31 17:25:02,726 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 369 GetRequests, 210 SyntacticMatches, 6 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11391 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=10557, Invalid=13313, Unknown=0, NotChecked=0, Total=23870 [2019-01-31 17:25:02,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2019-01-31 17:25:02,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 163. [2019-01-31 17:25:02,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2019-01-31 17:25:02,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 163 transitions. [2019-01-31 17:25:02,731 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 163 transitions. Word has length 159 [2019-01-31 17:25:02,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:25:02,731 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 163 transitions. [2019-01-31 17:25:02,731 INFO L481 AbstractCegarLoop]: Interpolant automaton has 108 states. [2019-01-31 17:25:02,731 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 163 transitions. [2019-01-31 17:25:02,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2019-01-31 17:25:02,732 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:25:02,732 INFO L402 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1] [2019-01-31 17:25:02,732 INFO L423 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:25:02,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:25:02,733 INFO L82 PathProgramCache]: Analyzing trace with hash 1700838412, now seen corresponding path program 53 times [2019-01-31 17:25:02,733 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:25:02,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:25:02,734 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:25:02,734 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:25:02,734 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:25:02,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:25:04,147 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 17:25:04,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:25:04,148 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:25:04,148 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:25:04,148 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:25:04,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:25:04,148 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 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 17:25:04,159 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:25:04,159 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:25:04,342 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2019-01-31 17:25:04,342 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:25:04,348 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:25:04,350 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 17:25:04,350 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:25:04,363 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 17:25:04,363 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:25:07,075 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 17:25:07,076 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:25:10,539 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 17:25:10,558 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:25:10,558 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 154 [2019-01-31 17:25:10,558 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:25:10,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2019-01-31 17:25:10,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2019-01-31 17:25:10,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10659, Invalid=13521, Unknown=0, NotChecked=0, Total=24180 [2019-01-31 17:25:10,560 INFO L87 Difference]: Start difference. First operand 163 states and 163 transitions. Second operand 110 states. [2019-01-31 17:25:11,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:25:11,067 INFO L93 Difference]: Finished difference Result 168 states and 168 transitions. [2019-01-31 17:25:11,067 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2019-01-31 17:25:11,067 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 162 [2019-01-31 17:25:11,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:25:11,068 INFO L225 Difference]: With dead ends: 168 [2019-01-31 17:25:11,068 INFO L226 Difference]: Without dead ends: 167 [2019-01-31 17:25:11,069 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 17:25:11,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2019-01-31 17:25:11,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2019-01-31 17:25:11,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2019-01-31 17:25:11,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 166 transitions. [2019-01-31 17:25:11,073 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 166 transitions. Word has length 162 [2019-01-31 17:25:11,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:25:11,073 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 166 transitions. [2019-01-31 17:25:11,073 INFO L481 AbstractCegarLoop]: Interpolant automaton has 110 states. [2019-01-31 17:25:11,074 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 166 transitions. [2019-01-31 17:25:11,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2019-01-31 17:25:11,074 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:25:11,074 INFO L402 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1] [2019-01-31 17:25:11,074 INFO L423 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:25:11,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:25:11,075 INFO L82 PathProgramCache]: Analyzing trace with hash 1947982496, now seen corresponding path program 54 times [2019-01-31 17:25:11,075 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:25:11,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:25:11,075 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:25:11,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:25:11,075 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:25:11,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:25:12,577 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 17:25:12,577 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:25:12,577 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:25:12,577 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:25:12,578 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:25:12,578 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:25:12,578 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 17:25:12,586 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:25:12,586 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:25:12,637 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:25:12,638 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:25:12,643 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:25:12,683 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 17:25:12,684 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:25:12,763 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 17:25:12,764 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:25:14,665 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 17:25:14,665 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:25:18,303 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 17:25:18,323 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:25:18,323 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 155 [2019-01-31 17:25:18,323 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:25:18,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 112 states [2019-01-31 17:25:18,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2019-01-31 17:25:18,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10761, Invalid=13731, Unknown=0, NotChecked=0, Total=24492 [2019-01-31 17:25:18,325 INFO L87 Difference]: Start difference. First operand 166 states and 166 transitions. Second operand 112 states. [2019-01-31 17:25:18,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:25:18,708 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2019-01-31 17:25:18,708 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2019-01-31 17:25:18,708 INFO L78 Accepts]: Start accepts. Automaton has 112 states. Word has length 165 [2019-01-31 17:25:18,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:25:18,709 INFO L225 Difference]: With dead ends: 171 [2019-01-31 17:25:18,709 INFO L226 Difference]: Without dead ends: 170 [2019-01-31 17:25:18,710 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 218 SyntacticMatches, 10 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12385 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=10761, Invalid=13731, Unknown=0, NotChecked=0, Total=24492 [2019-01-31 17:25:18,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2019-01-31 17:25:18,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2019-01-31 17:25:18,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2019-01-31 17:25:18,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 169 transitions. [2019-01-31 17:25:18,715 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 169 transitions. Word has length 165 [2019-01-31 17:25:18,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:25:18,715 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 169 transitions. [2019-01-31 17:25:18,715 INFO L481 AbstractCegarLoop]: Interpolant automaton has 112 states. [2019-01-31 17:25:18,716 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 169 transitions. [2019-01-31 17:25:18,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2019-01-31 17:25:18,716 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:25:18,716 INFO L402 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1] [2019-01-31 17:25:18,717 INFO L423 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:25:18,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:25:18,717 INFO L82 PathProgramCache]: Analyzing trace with hash -1251523700, now seen corresponding path program 55 times [2019-01-31 17:25:18,717 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:25:18,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:25:18,718 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:25:18,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:25:18,718 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:25:18,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:25:20,309 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 17:25:20,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:25:20,309 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:25:20,309 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:25:20,309 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:25:20,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:25:20,310 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 17:25:20,319 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:25:20,319 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:25:20,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:25:20,376 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:25:20,379 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-01-31 17:25:20,379 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:25:20,390 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 17:25:20,390 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:25:22,573 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 17:25:22,573 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:25:25,975 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 17:25:25,994 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:25:25,994 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 156 [2019-01-31 17:25:25,994 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:25:25,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 114 states [2019-01-31 17:25:25,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2019-01-31 17:25:25,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10863, Invalid=13943, Unknown=0, NotChecked=0, Total=24806 [2019-01-31 17:25:25,996 INFO L87 Difference]: Start difference. First operand 169 states and 169 transitions. Second operand 114 states. [2019-01-31 17:25:26,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:25:26,461 INFO L93 Difference]: Finished difference Result 174 states and 174 transitions. [2019-01-31 17:25:26,462 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2019-01-31 17:25:26,462 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 168 [2019-01-31 17:25:26,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:25:26,463 INFO L225 Difference]: With dead ends: 174 [2019-01-31 17:25:26,463 INFO L226 Difference]: Without dead ends: 173 [2019-01-31 17:25:26,464 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 17:25:26,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2019-01-31 17:25:26,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 172. [2019-01-31 17:25:26,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2019-01-31 17:25:26,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 172 transitions. [2019-01-31 17:25:26,469 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 172 transitions. Word has length 168 [2019-01-31 17:25:26,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:25:26,469 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 172 transitions. [2019-01-31 17:25:26,469 INFO L481 AbstractCegarLoop]: Interpolant automaton has 114 states. [2019-01-31 17:25:26,470 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 172 transitions. [2019-01-31 17:25:26,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2019-01-31 17:25:26,470 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:25:26,470 INFO L402 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1] [2019-01-31 17:25:26,470 INFO L423 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:25:26,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:25:26,471 INFO L82 PathProgramCache]: Analyzing trace with hash 468591392, now seen corresponding path program 56 times [2019-01-31 17:25:26,471 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:25:26,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:25:26,471 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:25:26,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:25:26,471 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:25:26,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:25:27,964 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 17:25:27,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:25:27,965 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:25:27,965 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:25:27,965 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:25:27,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:25:27,965 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 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 17:25:27,973 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:25:27,974 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:25:28,170 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2019-01-31 17:25:28,170 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:25:28,180 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:25:28,196 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 17:25:28,196 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:25:28,205 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 17:25:28,205 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:25:30,078 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 17:25:30,079 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:25:33,912 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 17:25:33,930 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:25:33,931 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 157 [2019-01-31 17:25:33,931 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:25:33,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2019-01-31 17:25:33,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2019-01-31 17:25:33,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10965, Invalid=14157, Unknown=0, NotChecked=0, Total=25122 [2019-01-31 17:25:33,933 INFO L87 Difference]: Start difference. First operand 172 states and 172 transitions. Second operand 116 states. [2019-01-31 17:25:34,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:25:34,338 INFO L93 Difference]: Finished difference Result 177 states and 177 transitions. [2019-01-31 17:25:34,339 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2019-01-31 17:25:34,339 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 171 [2019-01-31 17:25:34,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:25:34,340 INFO L225 Difference]: With dead ends: 177 [2019-01-31 17:25:34,340 INFO L226 Difference]: Without dead ends: 176 [2019-01-31 17:25:34,341 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 226 SyntacticMatches, 14 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13379 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=10965, Invalid=14157, Unknown=0, NotChecked=0, Total=25122 [2019-01-31 17:25:34,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2019-01-31 17:25:34,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 175. [2019-01-31 17:25:34,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2019-01-31 17:25:34,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 175 transitions. [2019-01-31 17:25:34,361 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 175 transitions. Word has length 171 [2019-01-31 17:25:34,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:25:34,361 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 175 transitions. [2019-01-31 17:25:34,361 INFO L481 AbstractCegarLoop]: Interpolant automaton has 116 states. [2019-01-31 17:25:34,361 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 175 transitions. [2019-01-31 17:25:34,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2019-01-31 17:25:34,362 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:25:34,362 INFO L402 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1] [2019-01-31 17:25:34,363 INFO L423 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:25:34,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:25:34,363 INFO L82 PathProgramCache]: Analyzing trace with hash 1162488588, now seen corresponding path program 57 times [2019-01-31 17:25:34,363 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:25:34,363 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:25:34,364 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:25:34,364 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:25:34,364 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:25:34,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:25:35,923 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 17:25:35,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:25:35,923 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:25:35,923 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:25:35,923 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:25:35,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:25:35,924 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 17:25:35,931 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:25:35,932 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:25:35,987 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:25:35,988 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:25:35,993 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:25:35,997 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 17:25:35,997 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:25:36,008 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 17:25:36,009 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:25:38,271 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 17:25:38,271 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:25:42,171 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 17:25:42,190 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:25:42,191 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 158 [2019-01-31 17:25:42,191 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:25:42,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 118 states [2019-01-31 17:25:42,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2019-01-31 17:25:42,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11067, Invalid=14373, Unknown=0, NotChecked=0, Total=25440 [2019-01-31 17:25:42,193 INFO L87 Difference]: Start difference. First operand 175 states and 175 transitions. Second operand 118 states. [2019-01-31 17:25:42,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:25:42,615 INFO L93 Difference]: Finished difference Result 180 states and 180 transitions. [2019-01-31 17:25:42,616 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2019-01-31 17:25:42,616 INFO L78 Accepts]: Start accepts. Automaton has 118 states. Word has length 174 [2019-01-31 17:25:42,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:25:42,617 INFO L225 Difference]: With dead ends: 180 [2019-01-31 17:25:42,617 INFO L226 Difference]: Without dead ends: 179 [2019-01-31 17:25:42,618 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 230 SyntacticMatches, 16 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13876 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=11067, Invalid=14373, Unknown=0, NotChecked=0, Total=25440 [2019-01-31 17:25:42,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2019-01-31 17:25:42,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 178. [2019-01-31 17:25:42,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2019-01-31 17:25:42,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 178 transitions. [2019-01-31 17:25:42,622 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 178 transitions. Word has length 174 [2019-01-31 17:25:42,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:25:42,623 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 178 transitions. [2019-01-31 17:25:42,623 INFO L481 AbstractCegarLoop]: Interpolant automaton has 118 states. [2019-01-31 17:25:42,623 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 178 transitions. [2019-01-31 17:25:42,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2019-01-31 17:25:42,623 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:25:42,624 INFO L402 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1] [2019-01-31 17:25:42,624 INFO L423 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:25:42,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:25:42,624 INFO L82 PathProgramCache]: Analyzing trace with hash 1376258976, now seen corresponding path program 58 times [2019-01-31 17:25:42,624 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:25:42,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:25:42,624 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:25:42,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:25:42,625 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:25:42,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:25:44,249 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 17:25:44,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:25:44,249 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:25:44,249 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:25:44,250 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:25:44,250 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:25:44,250 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 17:25:44,260 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:25:44,261 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:25:44,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:25:44,321 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:25:44,338 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 17:25:44,339 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:25:44,436 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 17:25:44,436 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:25:46,887 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 17:25:46,888 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:25:50,274 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 17:25:50,293 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:25:50,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 159 [2019-01-31 17:25:50,293 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:25:50,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 120 states [2019-01-31 17:25:50,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2019-01-31 17:25:50,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11169, Invalid=14591, Unknown=0, NotChecked=0, Total=25760 [2019-01-31 17:25:50,295 INFO L87 Difference]: Start difference. First operand 178 states and 178 transitions. Second operand 120 states. [2019-01-31 17:25:50,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:25:50,716 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2019-01-31 17:25:50,716 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2019-01-31 17:25:50,716 INFO L78 Accepts]: Start accepts. Automaton has 120 states. Word has length 177 [2019-01-31 17:25:50,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:25:50,717 INFO L225 Difference]: With dead ends: 183 [2019-01-31 17:25:50,718 INFO L226 Difference]: Without dead ends: 182 [2019-01-31 17:25:50,719 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 234 SyntacticMatches, 18 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14373 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=11169, Invalid=14591, Unknown=0, NotChecked=0, Total=25760 [2019-01-31 17:25:50,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2019-01-31 17:25:50,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 181. [2019-01-31 17:25:50,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2019-01-31 17:25:50,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 181 transitions. [2019-01-31 17:25:50,723 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 181 transitions. Word has length 177 [2019-01-31 17:25:50,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:25:50,724 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 181 transitions. [2019-01-31 17:25:50,724 INFO L481 AbstractCegarLoop]: Interpolant automaton has 120 states. [2019-01-31 17:25:50,724 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 181 transitions. [2019-01-31 17:25:50,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2019-01-31 17:25:50,725 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:25:50,725 INFO L402 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1] [2019-01-31 17:25:50,725 INFO L423 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:25:50,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:25:50,726 INFO L82 PathProgramCache]: Analyzing trace with hash 373387916, now seen corresponding path program 59 times [2019-01-31 17:25:50,726 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:25:50,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:25:50,726 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:25:50,727 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:25:50,727 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:25:50,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:25:52,719 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-31 17:25:52,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:25:52,719 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:25:52,719 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:25:52,719 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:25:52,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:25:52,719 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 17:25:52,728 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:25:52,728 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:25:52,952 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2019-01-31 17:25:52,953 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:25:52,958 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:25:52,960 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 17:25:52,961 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:25:52,971 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 17:25:52,971 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:25:55,009 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 17:25:55,009 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:25:58,872 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 17:25:58,891 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:25:58,892 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 160 [2019-01-31 17:25:58,892 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:25:58,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2019-01-31 17:25:58,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2019-01-31 17:25:58,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11271, Invalid=14811, Unknown=0, NotChecked=0, Total=26082 [2019-01-31 17:25:58,894 INFO L87 Difference]: Start difference. First operand 181 states and 181 transitions. Second operand 122 states. [2019-01-31 17:25:59,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:25:59,284 INFO L93 Difference]: Finished difference Result 186 states and 186 transitions. [2019-01-31 17:25:59,284 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2019-01-31 17:25:59,284 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 180 [2019-01-31 17:25:59,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:25:59,286 INFO L225 Difference]: With dead ends: 186 [2019-01-31 17:25:59,286 INFO L226 Difference]: Without dead ends: 185 [2019-01-31 17:25:59,287 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 238 SyntacticMatches, 20 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14870 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=11271, Invalid=14811, Unknown=0, NotChecked=0, Total=26082 [2019-01-31 17:25:59,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2019-01-31 17:25:59,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2019-01-31 17:25:59,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2019-01-31 17:25:59,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 184 transitions. [2019-01-31 17:25:59,293 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 184 transitions. Word has length 180 [2019-01-31 17:25:59,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:25:59,293 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 184 transitions. [2019-01-31 17:25:59,293 INFO L481 AbstractCegarLoop]: Interpolant automaton has 122 states. [2019-01-31 17:25:59,293 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 184 transitions. [2019-01-31 17:25:59,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2019-01-31 17:25:59,294 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:25:59,294 INFO L402 BasicCegarLoop]: trace histogram [61, 60, 60, 1, 1] [2019-01-31 17:25:59,295 INFO L423 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:25:59,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:25:59,295 INFO L82 PathProgramCache]: Analyzing trace with hash -365849568, now seen corresponding path program 60 times [2019-01-31 17:25:59,295 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:25:59,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:25:59,296 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:25:59,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:25:59,296 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:25:59,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:26:01,087 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 17:26:01,088 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:26:01,088 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:26:01,088 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:26:01,088 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:26:01,088 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:26:01,088 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 17:26:01,097 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:26:01,097 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:26:01,157 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:26:01,157 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:26:01,165 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:26:01,181 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 17:26:01,182 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:26:01,255 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 17:26:01,255 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:26:03,549 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 17:26:03,549 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:26:07,259 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 17:26:07,278 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:26:07,278 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 161 [2019-01-31 17:26:07,278 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:26:07,278 INFO L459 AbstractCegarLoop]: Interpolant automaton has 124 states [2019-01-31 17:26:07,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2019-01-31 17:26:07,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11373, Invalid=15033, Unknown=0, NotChecked=0, Total=26406 [2019-01-31 17:26:07,280 INFO L87 Difference]: Start difference. First operand 184 states and 184 transitions. Second operand 124 states. [2019-01-31 17:26:07,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:26:07,732 INFO L93 Difference]: Finished difference Result 189 states and 189 transitions. [2019-01-31 17:26:07,732 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2019-01-31 17:26:07,732 INFO L78 Accepts]: Start accepts. Automaton has 124 states. Word has length 183 [2019-01-31 17:26:07,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:26:07,733 INFO L225 Difference]: With dead ends: 189 [2019-01-31 17:26:07,734 INFO L226 Difference]: Without dead ends: 188 [2019-01-31 17:26:07,734 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 17:26:07,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2019-01-31 17:26:07,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 187. [2019-01-31 17:26:07,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2019-01-31 17:26:07,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 187 transitions. [2019-01-31 17:26:07,738 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 187 transitions. Word has length 183 [2019-01-31 17:26:07,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:26:07,738 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 187 transitions. [2019-01-31 17:26:07,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has 124 states. [2019-01-31 17:26:07,738 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 187 transitions. [2019-01-31 17:26:07,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2019-01-31 17:26:07,739 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:26:07,739 INFO L402 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1] [2019-01-31 17:26:07,739 INFO L423 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:26:07,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:26:07,739 INFO L82 PathProgramCache]: Analyzing trace with hash 1602558476, now seen corresponding path program 61 times [2019-01-31 17:26:07,740 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:26:07,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:26:07,740 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:26:07,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:26:07,740 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:26:07,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:26:09,521 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 17:26:09,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:26:09,522 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:26:09,522 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:26:09,522 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:26:09,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:26:09,522 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 17:26:09,531 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:26:09,531 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:26:09,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:26:09,587 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:26:09,590 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 17:26:09,590 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:26:09,605 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 17:26:09,605 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:26:11,767 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 17:26:11,767 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:26:15,589 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 17:26:15,608 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:26:15,608 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 162 [2019-01-31 17:26:15,608 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:26:15,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 126 states [2019-01-31 17:26:15,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2019-01-31 17:26:15,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11475, Invalid=15257, Unknown=0, NotChecked=0, Total=26732 [2019-01-31 17:26:15,610 INFO L87 Difference]: Start difference. First operand 187 states and 187 transitions. Second operand 126 states. [2019-01-31 17:26:16,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:26:16,096 INFO L93 Difference]: Finished difference Result 192 states and 192 transitions. [2019-01-31 17:26:16,097 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2019-01-31 17:26:16,097 INFO L78 Accepts]: Start accepts. Automaton has 126 states. Word has length 186 [2019-01-31 17:26:16,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:26:16,098 INFO L225 Difference]: With dead ends: 192 [2019-01-31 17:26:16,098 INFO L226 Difference]: Without dead ends: 191 [2019-01-31 17:26:16,099 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 17:26:16,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2019-01-31 17:26:16,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 190. [2019-01-31 17:26:16,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2019-01-31 17:26:16,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 190 transitions. [2019-01-31 17:26:16,103 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 190 transitions. Word has length 186 [2019-01-31 17:26:16,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:26:16,104 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 190 transitions. [2019-01-31 17:26:16,104 INFO L481 AbstractCegarLoop]: Interpolant automaton has 126 states. [2019-01-31 17:26:16,104 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 190 transitions. [2019-01-31 17:26:16,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2019-01-31 17:26:16,104 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:26:16,105 INFO L402 BasicCegarLoop]: trace histogram [63, 62, 62, 1, 1] [2019-01-31 17:26:16,105 INFO L423 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:26:16,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:26:16,105 INFO L82 PathProgramCache]: Analyzing trace with hash -1036862304, now seen corresponding path program 62 times [2019-01-31 17:26:16,105 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:26:16,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:26:16,106 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:26:16,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:26:16,106 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:26:16,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:26:18,248 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 17:26:18,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:26:18,249 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:26:18,249 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:26:18,249 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:26:18,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:26:18,249 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 17:26:18,259 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:26:18,259 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:26:18,495 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 63 check-sat command(s) [2019-01-31 17:26:18,496 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:26:18,502 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:26:18,504 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 17:26:18,504 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:26:18,512 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 17:26:18,512 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:26:20,783 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 17:26:20,784 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:26:24,602 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 17:26:24,621 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:26:24,621 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 163 [2019-01-31 17:26:24,621 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:26:24,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2019-01-31 17:26:24,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2019-01-31 17:26:24,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11577, Invalid=15483, Unknown=0, NotChecked=0, Total=27060 [2019-01-31 17:26:24,624 INFO L87 Difference]: Start difference. First operand 190 states and 190 transitions. Second operand 128 states. [2019-01-31 17:26:25,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:26:25,128 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2019-01-31 17:26:25,129 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2019-01-31 17:26:25,129 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 189 [2019-01-31 17:26:25,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:26:25,130 INFO L225 Difference]: With dead ends: 195 [2019-01-31 17:26:25,130 INFO L226 Difference]: Without dead ends: 194 [2019-01-31 17:26:25,132 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 439 GetRequests, 250 SyntacticMatches, 26 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16361 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=11577, Invalid=15483, Unknown=0, NotChecked=0, Total=27060 [2019-01-31 17:26:25,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2019-01-31 17:26:25,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 193. [2019-01-31 17:26:25,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2019-01-31 17:26:25,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 193 transitions. [2019-01-31 17:26:25,137 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 193 transitions. Word has length 189 [2019-01-31 17:26:25,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:26:25,137 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 193 transitions. [2019-01-31 17:26:25,137 INFO L481 AbstractCegarLoop]: Interpolant automaton has 128 states. [2019-01-31 17:26:25,137 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 193 transitions. [2019-01-31 17:26:25,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2019-01-31 17:26:25,138 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:26:25,138 INFO L402 BasicCegarLoop]: trace histogram [64, 63, 63, 1, 1] [2019-01-31 17:26:25,138 INFO L423 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:26:25,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:26:25,138 INFO L82 PathProgramCache]: Analyzing trace with hash 239935884, now seen corresponding path program 63 times [2019-01-31 17:26:25,138 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:26:25,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:26:25,139 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:26:25,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:26:25,139 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:26:25,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:26:27,046 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 17:26:27,046 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:26:27,046 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:26:27,046 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:26:27,046 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:26:27,047 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:26:27,047 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 17:26:27,057 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:26:27,058 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:26:27,118 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:26:27,118 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:26:27,125 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:26:27,131 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 17:26:27,131 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:26:27,142 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 17:26:27,142 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:26:29,692 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 17:26:29,692 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:26:33,607 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 17:26:33,625 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:26:33,626 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 164 [2019-01-31 17:26:33,626 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:26:33,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 130 states [2019-01-31 17:26:33,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2019-01-31 17:26:33,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11679, Invalid=15711, Unknown=0, NotChecked=0, Total=27390 [2019-01-31 17:26:33,628 INFO L87 Difference]: Start difference. First operand 193 states and 193 transitions. Second operand 130 states. [2019-01-31 17:26:34,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:26:34,143 INFO L93 Difference]: Finished difference Result 198 states and 198 transitions. [2019-01-31 17:26:34,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2019-01-31 17:26:34,144 INFO L78 Accepts]: Start accepts. Automaton has 130 states. Word has length 192 [2019-01-31 17:26:34,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:26:34,145 INFO L225 Difference]: With dead ends: 198 [2019-01-31 17:26:34,145 INFO L226 Difference]: Without dead ends: 197 [2019-01-31 17:26:34,146 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 254 SyntacticMatches, 28 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16858 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=11679, Invalid=15711, Unknown=0, NotChecked=0, Total=27390 [2019-01-31 17:26:34,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2019-01-31 17:26:34,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 196. [2019-01-31 17:26:34,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2019-01-31 17:26:34,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 196 transitions. [2019-01-31 17:26:34,152 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 196 transitions. Word has length 192 [2019-01-31 17:26:34,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:26:34,152 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 196 transitions. [2019-01-31 17:26:34,152 INFO L481 AbstractCegarLoop]: Interpolant automaton has 130 states. [2019-01-31 17:26:34,152 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 196 transitions. [2019-01-31 17:26:34,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2019-01-31 17:26:34,153 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:26:34,154 INFO L402 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1] [2019-01-31 17:26:34,154 INFO L423 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:26:34,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:26:34,154 INFO L82 PathProgramCache]: Analyzing trace with hash 1104381216, now seen corresponding path program 64 times [2019-01-31 17:26:34,154 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:26:34,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:26:34,155 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:26:34,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:26:34,155 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:26:34,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:26:36,064 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 17:26:36,065 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:26:36,065 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:26:36,065 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:26:36,065 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:26:36,065 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:26:36,065 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 17:26:36,077 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:26:36,077 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:26:36,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:26:36,134 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:26:36,142 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 17:26:36,142 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:26:36,154 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 17:26:36,155 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:26:38,826 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 17:26:38,826 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:26:42,501 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 17:26:42,520 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:26:42,520 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 165 [2019-01-31 17:26:42,520 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:26:42,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2019-01-31 17:26:42,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2019-01-31 17:26:42,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11781, Invalid=15941, Unknown=0, NotChecked=0, Total=27722 [2019-01-31 17:26:42,522 INFO L87 Difference]: Start difference. First operand 196 states and 196 transitions. Second operand 132 states. [2019-01-31 17:26:43,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:26:43,012 INFO L93 Difference]: Finished difference Result 201 states and 201 transitions. [2019-01-31 17:26:43,012 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2019-01-31 17:26:43,013 INFO L78 Accepts]: Start accepts. Automaton has 132 states. Word has length 195 [2019-01-31 17:26:43,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:26:43,014 INFO L225 Difference]: With dead ends: 201 [2019-01-31 17:26:43,014 INFO L226 Difference]: Without dead ends: 200 [2019-01-31 17:26:43,014 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 258 SyntacticMatches, 30 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17355 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=11781, Invalid=15941, Unknown=0, NotChecked=0, Total=27722 [2019-01-31 17:26:43,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2019-01-31 17:26:43,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 199. [2019-01-31 17:26:43,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2019-01-31 17:26:43,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 199 transitions. [2019-01-31 17:26:43,019 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 199 transitions. Word has length 195 [2019-01-31 17:26:43,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:26:43,020 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 199 transitions. [2019-01-31 17:26:43,020 INFO L481 AbstractCegarLoop]: Interpolant automaton has 132 states. [2019-01-31 17:26:43,020 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 199 transitions. [2019-01-31 17:26:43,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2019-01-31 17:26:43,021 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:26:43,021 INFO L402 BasicCegarLoop]: trace histogram [66, 65, 65, 1, 1] [2019-01-31 17:26:43,021 INFO L423 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:26:43,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:26:43,022 INFO L82 PathProgramCache]: Analyzing trace with hash 1171360012, now seen corresponding path program 65 times [2019-01-31 17:26:43,022 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:26:43,022 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:26:43,022 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:26:43,022 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:26:43,023 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:26:43,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:26:45,067 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 17:26:45,068 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:26:45,068 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:26:45,068 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:26:45,068 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:26:45,068 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:26:45,068 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 17:26:45,076 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:26:45,076 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:26:45,346 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2019-01-31 17:26:45,346 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:26:45,352 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:26:45,355 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-01-31 17:26:45,355 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:26:45,366 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:26:45,367 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:26:47,804 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 17:26:47,804 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:26:51,634 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 17:26:51,654 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:26:51,654 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 166 [2019-01-31 17:26:51,654 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:26:51,655 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2019-01-31 17:26:51,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2019-01-31 17:26:51,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11883, Invalid=16173, Unknown=0, NotChecked=0, Total=28056 [2019-01-31 17:26:51,656 INFO L87 Difference]: Start difference. First operand 199 states and 199 transitions. Second operand 134 states. [2019-01-31 17:26:52,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:26:52,109 INFO L93 Difference]: Finished difference Result 204 states and 204 transitions. [2019-01-31 17:26:52,109 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2019-01-31 17:26:52,109 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 198 [2019-01-31 17:26:52,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:26:52,110 INFO L225 Difference]: With dead ends: 204 [2019-01-31 17:26:52,110 INFO L226 Difference]: Without dead ends: 203 [2019-01-31 17:26:52,111 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 262 SyntacticMatches, 32 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17852 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=11883, Invalid=16173, Unknown=0, NotChecked=0, Total=28056 [2019-01-31 17:26:52,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2019-01-31 17:26:52,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 202. [2019-01-31 17:26:52,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2019-01-31 17:26:52,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 202 transitions. [2019-01-31 17:26:52,115 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 202 transitions. Word has length 198 [2019-01-31 17:26:52,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:26:52,115 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 202 transitions. [2019-01-31 17:26:52,115 INFO L481 AbstractCegarLoop]: Interpolant automaton has 134 states. [2019-01-31 17:26:52,115 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 202 transitions. [2019-01-31 17:26:52,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2019-01-31 17:26:52,116 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:26:52,116 INFO L402 BasicCegarLoop]: trace histogram [67, 66, 66, 1, 1] [2019-01-31 17:26:52,117 INFO L423 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:26:52,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:26:52,117 INFO L82 PathProgramCache]: Analyzing trace with hash -623120992, now seen corresponding path program 66 times [2019-01-31 17:26:52,117 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:26:52,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:26:52,118 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:26:52,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:26:52,118 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:26:52,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:26:54,503 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 17:26:54,503 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:26:54,504 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:26:54,504 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:26:54,504 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:26:54,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:26:54,504 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:26:54,513 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:26:54,513 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:26:54,576 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:26:54,576 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:26:54,583 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:26:54,599 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 17:26:54,599 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:26:54,623 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 17:26:54,624 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:26:57,099 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 17:26:57,099 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:27:01,091 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 17:27:01,110 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:27:01,110 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 167 [2019-01-31 17:27:01,110 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:27:01,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 136 states [2019-01-31 17:27:01,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2019-01-31 17:27:01,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11985, Invalid=16407, Unknown=0, NotChecked=0, Total=28392 [2019-01-31 17:27:01,113 INFO L87 Difference]: Start difference. First operand 202 states and 202 transitions. Second operand 136 states. [2019-01-31 17:27:01,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:27:01,631 INFO L93 Difference]: Finished difference Result 207 states and 207 transitions. [2019-01-31 17:27:01,631 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2019-01-31 17:27:01,631 INFO L78 Accepts]: Start accepts. Automaton has 136 states. Word has length 201 [2019-01-31 17:27:01,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:27:01,632 INFO L225 Difference]: With dead ends: 207 [2019-01-31 17:27:01,632 INFO L226 Difference]: Without dead ends: 206 [2019-01-31 17:27:01,634 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 266 SyntacticMatches, 34 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18349 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=11985, Invalid=16407, Unknown=0, NotChecked=0, Total=28392 [2019-01-31 17:27:01,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2019-01-31 17:27:01,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 205. [2019-01-31 17:27:01,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2019-01-31 17:27:01,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 205 transitions. [2019-01-31 17:27:01,638 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 205 transitions. Word has length 201 [2019-01-31 17:27:01,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:27:01,638 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 205 transitions. [2019-01-31 17:27:01,638 INFO L481 AbstractCegarLoop]: Interpolant automaton has 136 states. [2019-01-31 17:27:01,638 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 205 transitions. [2019-01-31 17:27:01,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2019-01-31 17:27:01,639 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:27:01,639 INFO L402 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1] [2019-01-31 17:27:01,640 INFO L423 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:27:01,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:27:01,640 INFO L82 PathProgramCache]: Analyzing trace with hash -548777844, now seen corresponding path program 67 times [2019-01-31 17:27:01,640 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:27:01,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:27:01,641 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:27:01,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:27:01,641 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:27:01,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:27:04,279 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 17:27:04,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:27:04,279 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:27:04,279 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:27:04,279 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:27:04,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:27:04,280 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 17:27:04,289 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:27:04,290 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:27:04,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:27:04,348 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:27:04,352 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 17:27:04,352 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:27:04,364 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 17:27:04,364 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:27:06,963 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 17:27:06,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:27:10,945 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 17:27:10,963 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:27:10,963 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 168 [2019-01-31 17:27:10,963 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:27:10,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 138 states [2019-01-31 17:27:10,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 138 interpolants. [2019-01-31 17:27:10,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12087, Invalid=16643, Unknown=0, NotChecked=0, Total=28730 [2019-01-31 17:27:10,966 INFO L87 Difference]: Start difference. First operand 205 states and 205 transitions. Second operand 138 states. [2019-01-31 17:27:11,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:27:11,389 INFO L93 Difference]: Finished difference Result 210 states and 210 transitions. [2019-01-31 17:27:11,389 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2019-01-31 17:27:11,389 INFO L78 Accepts]: Start accepts. Automaton has 138 states. Word has length 204 [2019-01-31 17:27:11,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:27:11,390 INFO L225 Difference]: With dead ends: 210 [2019-01-31 17:27:11,390 INFO L226 Difference]: Without dead ends: 209 [2019-01-31 17:27:11,391 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 270 SyntacticMatches, 36 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18846 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=12087, Invalid=16643, Unknown=0, NotChecked=0, Total=28730 [2019-01-31 17:27:11,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2019-01-31 17:27:11,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 208. [2019-01-31 17:27:11,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2019-01-31 17:27:11,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 208 transitions. [2019-01-31 17:27:11,395 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 208 transitions. Word has length 204 [2019-01-31 17:27:11,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:27:11,395 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 208 transitions. [2019-01-31 17:27:11,395 INFO L481 AbstractCegarLoop]: Interpolant automaton has 138 states. [2019-01-31 17:27:11,395 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 208 transitions. [2019-01-31 17:27:11,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2019-01-31 17:27:11,396 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:27:11,396 INFO L402 BasicCegarLoop]: trace histogram [69, 68, 68, 1, 1] [2019-01-31 17:27:11,396 INFO L423 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:27:11,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:27:11,397 INFO L82 PathProgramCache]: Analyzing trace with hash -1995180512, now seen corresponding path program 68 times [2019-01-31 17:27:11,397 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:27:11,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:27:11,397 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:27:11,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:27:11,397 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:27:11,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:27:13,573 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 17:27:13,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:27:13,573 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:27:13,574 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:27:13,574 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:27:13,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:27:13,574 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 17:27:13,593 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:27:13,594 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:27:13,872 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2019-01-31 17:27:13,872 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:27:13,879 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:27:13,885 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 17:27:13,885 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:27:13,896 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 17:27:13,896 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:27:16,563 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 17:27:16,563 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:27:20,541 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 17:27:20,560 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:27:20,561 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 169 [2019-01-31 17:27:20,561 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:27:20,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2019-01-31 17:27:20,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2019-01-31 17:27:20,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12189, Invalid=16881, Unknown=0, NotChecked=0, Total=29070 [2019-01-31 17:27:20,563 INFO L87 Difference]: Start difference. First operand 208 states and 208 transitions. Second operand 140 states. [2019-01-31 17:27:21,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:27:21,116 INFO L93 Difference]: Finished difference Result 213 states and 213 transitions. [2019-01-31 17:27:21,117 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2019-01-31 17:27:21,117 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 207 [2019-01-31 17:27:21,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:27:21,118 INFO L225 Difference]: With dead ends: 213 [2019-01-31 17:27:21,118 INFO L226 Difference]: Without dead ends: 212 [2019-01-31 17:27:21,120 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 274 SyntacticMatches, 38 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19343 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=12189, Invalid=16881, Unknown=0, NotChecked=0, Total=29070 [2019-01-31 17:27:21,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2019-01-31 17:27:21,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 211. [2019-01-31 17:27:21,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 211 states. [2019-01-31 17:27:21,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 211 transitions. [2019-01-31 17:27:21,126 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 211 transitions. Word has length 207 [2019-01-31 17:27:21,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:27:21,126 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 211 transitions. [2019-01-31 17:27:21,127 INFO L481 AbstractCegarLoop]: Interpolant automaton has 140 states. [2019-01-31 17:27:21,127 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 211 transitions. [2019-01-31 17:27:21,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2019-01-31 17:27:21,128 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:27:21,128 INFO L402 BasicCegarLoop]: trace histogram [70, 69, 69, 1, 1] [2019-01-31 17:27:21,128 INFO L423 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:27:21,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:27:21,128 INFO L82 PathProgramCache]: Analyzing trace with hash -370182132, now seen corresponding path program 69 times [2019-01-31 17:27:21,128 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:27:21,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:27:21,129 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:27:21,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:27:21,129 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:27:21,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:27:23,483 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 17:27:23,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:27:23,483 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:27:23,483 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:27:23,484 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:27:23,484 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:27:23,484 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 17:27:23,491 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:27:23,491 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:27:23,556 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:27:23,557 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:27:23,563 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:27:23,568 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 17:27:23,568 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:27:23,576 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 17:27:23,576 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:27:26,542 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 17:27:26,542 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:27:30,645 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 17:27:30,664 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:27:30,664 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 170 [2019-01-31 17:27:30,664 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:27:30,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 142 states [2019-01-31 17:27:30,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2019-01-31 17:27:30,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12291, Invalid=17121, Unknown=0, NotChecked=0, Total=29412 [2019-01-31 17:27:30,667 INFO L87 Difference]: Start difference. First operand 211 states and 211 transitions. Second operand 142 states. [2019-01-31 17:27:31,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:27:31,163 INFO L93 Difference]: Finished difference Result 216 states and 216 transitions. [2019-01-31 17:27:31,163 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2019-01-31 17:27:31,163 INFO L78 Accepts]: Start accepts. Automaton has 142 states. Word has length 210 [2019-01-31 17:27:31,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:27:31,165 INFO L225 Difference]: With dead ends: 216 [2019-01-31 17:27:31,165 INFO L226 Difference]: Without dead ends: 215 [2019-01-31 17:27:31,166 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 278 SyntacticMatches, 40 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19840 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=12291, Invalid=17121, Unknown=0, NotChecked=0, Total=29412 [2019-01-31 17:27:31,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2019-01-31 17:27:31,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 214. [2019-01-31 17:27:31,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2019-01-31 17:27:31,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 214 transitions. [2019-01-31 17:27:31,172 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 214 transitions. Word has length 210 [2019-01-31 17:27:31,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:27:31,173 INFO L480 AbstractCegarLoop]: Abstraction has 214 states and 214 transitions. [2019-01-31 17:27:31,173 INFO L481 AbstractCegarLoop]: Interpolant automaton has 142 states. [2019-01-31 17:27:31,173 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 214 transitions. [2019-01-31 17:27:31,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2019-01-31 17:27:31,174 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:27:31,174 INFO L402 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1] [2019-01-31 17:27:31,174 INFO L423 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:27:31,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:27:31,175 INFO L82 PathProgramCache]: Analyzing trace with hash 1380163232, now seen corresponding path program 70 times [2019-01-31 17:27:31,175 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:27:31,175 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:27:31,175 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:27:31,176 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:27:31,176 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:27:31,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:27:33,475 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 17:27:33,475 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:27:33,475 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:27:33,476 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:27:33,476 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:27:33,476 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:27:33,476 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 17:27:33,484 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:27:33,484 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:27:33,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:27:33,551 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:27:33,557 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 17:27:33,557 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:27:33,567 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 17:27:33,567 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:27:36,650 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 17:27:36,650 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:27:40,715 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 17:27:40,736 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:27:40,736 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 171 [2019-01-31 17:27:40,736 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:27:40,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 144 states [2019-01-31 17:27:40,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2019-01-31 17:27:40,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12393, Invalid=17363, Unknown=0, NotChecked=0, Total=29756 [2019-01-31 17:27:40,738 INFO L87 Difference]: Start difference. First operand 214 states and 214 transitions. Second operand 144 states. [2019-01-31 17:27:41,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:27:41,192 INFO L93 Difference]: Finished difference Result 219 states and 219 transitions. [2019-01-31 17:27:41,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2019-01-31 17:27:41,193 INFO L78 Accepts]: Start accepts. Automaton has 144 states. Word has length 213 [2019-01-31 17:27:41,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:27:41,194 INFO L225 Difference]: With dead ends: 219 [2019-01-31 17:27:41,195 INFO L226 Difference]: Without dead ends: 218 [2019-01-31 17:27:41,196 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 282 SyntacticMatches, 42 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20337 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=12393, Invalid=17363, Unknown=0, NotChecked=0, Total=29756 [2019-01-31 17:27:41,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2019-01-31 17:27:41,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 217. [2019-01-31 17:27:41,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2019-01-31 17:27:41,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 217 transitions. [2019-01-31 17:27:41,200 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 217 transitions. Word has length 213 [2019-01-31 17:27:41,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:27:41,200 INFO L480 AbstractCegarLoop]: Abstraction has 217 states and 217 transitions. [2019-01-31 17:27:41,200 INFO L481 AbstractCegarLoop]: Interpolant automaton has 144 states. [2019-01-31 17:27:41,201 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 217 transitions. [2019-01-31 17:27:41,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2019-01-31 17:27:41,202 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:27:41,202 INFO L402 BasicCegarLoop]: trace histogram [72, 71, 71, 1, 1] [2019-01-31 17:27:41,202 INFO L423 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:27:41,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:27:41,202 INFO L82 PathProgramCache]: Analyzing trace with hash 720961420, now seen corresponding path program 71 times [2019-01-31 17:27:41,202 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:27:41,203 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:27:41,203 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:27:41,203 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:27:41,203 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:27:41,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:27:43,606 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 17:27:43,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:27:43,606 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:27:43,607 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:27:43,607 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:27:43,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:27:43,607 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 17:27:43,616 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:27:43,616 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:27:43,934 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 72 check-sat command(s) [2019-01-31 17:27:43,934 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:27:43,942 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:27:43,946 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 17:27:43,946 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:27:43,955 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 17:27:43,955 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:27:46,985 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 17:27:46,986 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:27:51,077 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 17:27:51,096 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:27:51,096 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 172 [2019-01-31 17:27:51,096 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:27:51,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2019-01-31 17:27:51,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2019-01-31 17:27:51,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12495, Invalid=17607, Unknown=0, NotChecked=0, Total=30102 [2019-01-31 17:27:51,099 INFO L87 Difference]: Start difference. First operand 217 states and 217 transitions. Second operand 146 states. [2019-01-31 17:27:51,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:27:51,595 INFO L93 Difference]: Finished difference Result 222 states and 222 transitions. [2019-01-31 17:27:51,595 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2019-01-31 17:27:51,595 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 216 [2019-01-31 17:27:51,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:27:51,597 INFO L225 Difference]: With dead ends: 222 [2019-01-31 17:27:51,597 INFO L226 Difference]: Without dead ends: 221 [2019-01-31 17:27:51,598 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 286 SyntacticMatches, 44 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20834 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=12495, Invalid=17607, Unknown=0, NotChecked=0, Total=30102 [2019-01-31 17:27:51,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2019-01-31 17:27:51,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 220. [2019-01-31 17:27:51,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2019-01-31 17:27:51,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 220 transitions. [2019-01-31 17:27:51,602 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 220 transitions. Word has length 216 [2019-01-31 17:27:51,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:27:51,602 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 220 transitions. [2019-01-31 17:27:51,602 INFO L481 AbstractCegarLoop]: Interpolant automaton has 146 states. [2019-01-31 17:27:51,602 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 220 transitions. [2019-01-31 17:27:51,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2019-01-31 17:27:51,603 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:27:51,603 INFO L402 BasicCegarLoop]: trace histogram [73, 72, 72, 1, 1] [2019-01-31 17:27:51,604 INFO L423 AbstractCegarLoop]: === Iteration 73 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:27:51,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:27:51,604 INFO L82 PathProgramCache]: Analyzing trace with hash -969742560, now seen corresponding path program 72 times [2019-01-31 17:27:51,604 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:27:51,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:27:51,604 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:27:51,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:27:51,605 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:27:51,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:27:54,054 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 17:27:54,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:27:54,054 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:27:54,054 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:27:54,054 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:27:54,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:27:54,055 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 17:27:54,063 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:27:54,063 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:27:54,136 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:27:54,136 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:27:54,143 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:27:54,145 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 17:27:54,145 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:27:54,159 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 17:27:54,159 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:27:57,436 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 17:27:57,437 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:28:01,580 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 17:28:01,599 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:28:01,599 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 173 [2019-01-31 17:28:01,599 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:28:01,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 148 states [2019-01-31 17:28:01,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2019-01-31 17:28:01,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12597, Invalid=17853, Unknown=0, NotChecked=0, Total=30450 [2019-01-31 17:28:01,602 INFO L87 Difference]: Start difference. First operand 220 states and 220 transitions. Second operand 148 states. [2019-01-31 17:28:02,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:28:02,087 INFO L93 Difference]: Finished difference Result 225 states and 225 transitions. [2019-01-31 17:28:02,087 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2019-01-31 17:28:02,087 INFO L78 Accepts]: Start accepts. Automaton has 148 states. Word has length 219 [2019-01-31 17:28:02,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:28:02,089 INFO L225 Difference]: With dead ends: 225 [2019-01-31 17:28:02,089 INFO L226 Difference]: Without dead ends: 224 [2019-01-31 17:28:02,090 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 17:28:02,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2019-01-31 17:28:02,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 223. [2019-01-31 17:28:02,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2019-01-31 17:28:02,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 223 transitions. [2019-01-31 17:28:02,095 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 223 transitions. Word has length 219 [2019-01-31 17:28:02,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:28:02,095 INFO L480 AbstractCegarLoop]: Abstraction has 223 states and 223 transitions. [2019-01-31 17:28:02,095 INFO L481 AbstractCegarLoop]: Interpolant automaton has 148 states. [2019-01-31 17:28:02,095 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 223 transitions. [2019-01-31 17:28:02,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2019-01-31 17:28:02,096 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:28:02,096 INFO L402 BasicCegarLoop]: trace histogram [74, 73, 73, 1, 1] [2019-01-31 17:28:02,096 INFO L423 AbstractCegarLoop]: === Iteration 74 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:28:02,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:28:02,096 INFO L82 PathProgramCache]: Analyzing trace with hash -1650530548, now seen corresponding path program 73 times [2019-01-31 17:28:02,096 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:28:02,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:28:02,097 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:28:02,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:28:02,097 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:28:02,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:28:04,614 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 17:28:04,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:28:04,615 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:28:04,615 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:28:04,615 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:28:04,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:28:04,615 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 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 17:28:04,624 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:28:04,624 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:28:04,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:28:04,692 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:28:04,694 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-01-31 17:28:04,694 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:28:04,704 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 17:28:04,704 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:28:07,978 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 17:28:07,978 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:28:12,193 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 17:28:12,211 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:28:12,212 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 174 [2019-01-31 17:28:12,212 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:28:12,212 INFO L459 AbstractCegarLoop]: Interpolant automaton has 150 states [2019-01-31 17:28:12,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 150 interpolants. [2019-01-31 17:28:12,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12699, Invalid=18101, Unknown=0, NotChecked=0, Total=30800 [2019-01-31 17:28:12,214 INFO L87 Difference]: Start difference. First operand 223 states and 223 transitions. Second operand 150 states. [2019-01-31 17:28:12,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:28:12,760 INFO L93 Difference]: Finished difference Result 228 states and 228 transitions. [2019-01-31 17:28:12,760 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2019-01-31 17:28:12,760 INFO L78 Accepts]: Start accepts. Automaton has 150 states. Word has length 222 [2019-01-31 17:28:12,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:28:12,762 INFO L225 Difference]: With dead ends: 228 [2019-01-31 17:28:12,762 INFO L226 Difference]: Without dead ends: 227 [2019-01-31 17:28:12,763 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 516 GetRequests, 294 SyntacticMatches, 48 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21828 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=12699, Invalid=18101, Unknown=0, NotChecked=0, Total=30800 [2019-01-31 17:28:12,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2019-01-31 17:28:12,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 226. [2019-01-31 17:28:12,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2019-01-31 17:28:12,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 226 transitions. [2019-01-31 17:28:12,769 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 226 transitions. Word has length 222 [2019-01-31 17:28:12,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:28:12,769 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 226 transitions. [2019-01-31 17:28:12,769 INFO L481 AbstractCegarLoop]: Interpolant automaton has 150 states. [2019-01-31 17:28:12,770 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 226 transitions. [2019-01-31 17:28:12,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2019-01-31 17:28:12,770 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:28:12,771 INFO L402 BasicCegarLoop]: trace histogram [75, 74, 74, 1, 1] [2019-01-31 17:28:12,771 INFO L423 AbstractCegarLoop]: === Iteration 75 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:28:12,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:28:12,771 INFO L82 PathProgramCache]: Analyzing trace with hash 2125057952, now seen corresponding path program 74 times [2019-01-31 17:28:12,771 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:28:12,772 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:28:12,772 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:28:12,772 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:28:12,772 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:28:12,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:28:15,620 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 17:28:15,621 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:28:15,621 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:28:15,621 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:28:15,621 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:28:15,621 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:28:15,621 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 17:28:15,630 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:28:15,631 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:28:15,943 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 75 check-sat command(s) [2019-01-31 17:28:15,943 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:28:15,950 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:28:15,953 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 17:28:15,953 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:28:15,962 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:28:15,962 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:28:19,028 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 17:28:19,028 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:28:23,209 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 17:28:23,229 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:28:23,229 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 175 [2019-01-31 17:28:23,229 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:28:23,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2019-01-31 17:28:23,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2019-01-31 17:28:23,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12801, Invalid=18351, Unknown=0, NotChecked=0, Total=31152 [2019-01-31 17:28:23,232 INFO L87 Difference]: Start difference. First operand 226 states and 226 transitions. Second operand 152 states. [2019-01-31 17:28:23,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:28:23,832 INFO L93 Difference]: Finished difference Result 231 states and 231 transitions. [2019-01-31 17:28:23,833 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2019-01-31 17:28:23,833 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 225 [2019-01-31 17:28:23,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:28:23,834 INFO L225 Difference]: With dead ends: 231 [2019-01-31 17:28:23,835 INFO L226 Difference]: Without dead ends: 230 [2019-01-31 17:28:23,836 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 298 SyntacticMatches, 50 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22325 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=12801, Invalid=18351, Unknown=0, NotChecked=0, Total=31152 [2019-01-31 17:28:23,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2019-01-31 17:28:23,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 229. [2019-01-31 17:28:23,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2019-01-31 17:28:23,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 229 transitions. [2019-01-31 17:28:23,842 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 229 transitions. Word has length 225 [2019-01-31 17:28:23,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:28:23,842 INFO L480 AbstractCegarLoop]: Abstraction has 229 states and 229 transitions. [2019-01-31 17:28:23,842 INFO L481 AbstractCegarLoop]: Interpolant automaton has 152 states. [2019-01-31 17:28:23,842 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 229 transitions. [2019-01-31 17:28:23,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2019-01-31 17:28:23,843 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:28:23,844 INFO L402 BasicCegarLoop]: trace histogram [76, 75, 75, 1, 1] [2019-01-31 17:28:23,844 INFO L423 AbstractCegarLoop]: === Iteration 76 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:28:23,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:28:23,844 INFO L82 PathProgramCache]: Analyzing trace with hash -216453492, now seen corresponding path program 75 times [2019-01-31 17:28:23,844 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:28:23,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:28:23,845 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:28:23,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:28:23,845 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:28:23,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:28:26,744 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 17:28:26,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:28:26,744 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:28:26,744 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:28:26,745 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:28:26,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:28:26,745 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 17:28:26,754 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:28:26,754 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:28:26,828 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:28:26,828 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:28:26,835 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:28:26,840 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 17:28:26,840 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:28:26,850 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 17:28:26,850 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:28:30,038 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 17:28:30,038 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:28:34,067 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 17:28:34,087 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:28:34,087 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 176 [2019-01-31 17:28:34,087 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:28:34,088 INFO L459 AbstractCegarLoop]: Interpolant automaton has 154 states [2019-01-31 17:28:34,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2019-01-31 17:28:34,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12903, Invalid=18603, Unknown=0, NotChecked=0, Total=31506 [2019-01-31 17:28:34,090 INFO L87 Difference]: Start difference. First operand 229 states and 229 transitions. Second operand 154 states. [2019-01-31 17:28:34,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:28:34,735 INFO L93 Difference]: Finished difference Result 234 states and 234 transitions. [2019-01-31 17:28:34,735 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2019-01-31 17:28:34,736 INFO L78 Accepts]: Start accepts. Automaton has 154 states. Word has length 228 [2019-01-31 17:28:34,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:28:34,737 INFO L225 Difference]: With dead ends: 234 [2019-01-31 17:28:34,737 INFO L226 Difference]: Without dead ends: 233 [2019-01-31 17:28:34,738 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 17:28:34,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2019-01-31 17:28:34,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 232. [2019-01-31 17:28:34,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2019-01-31 17:28:34,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 232 transitions. [2019-01-31 17:28:34,743 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 232 transitions. Word has length 228 [2019-01-31 17:28:34,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:28:34,743 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 232 transitions. [2019-01-31 17:28:34,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has 154 states. [2019-01-31 17:28:34,743 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 232 transitions. [2019-01-31 17:28:34,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2019-01-31 17:28:34,744 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:28:34,745 INFO L402 BasicCegarLoop]: trace histogram [77, 76, 76, 1, 1] [2019-01-31 17:28:34,745 INFO L423 AbstractCegarLoop]: === Iteration 77 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:28:34,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:28:34,745 INFO L82 PathProgramCache]: Analyzing trace with hash -1620027360, now seen corresponding path program 76 times [2019-01-31 17:28:34,745 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:28:34,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:28:34,746 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:28:34,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:28:34,746 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:28:34,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:28:37,704 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 17:28:37,705 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:28:37,705 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:28:37,705 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:28:37,705 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:28:37,705 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:28:37,705 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 17:28:37,713 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:28:37,713 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:28:37,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:28:37,782 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:28:37,789 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 17:28:37,789 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:28:37,801 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 17:28:37,801 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:28:41,318 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 17:28:41,319 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:28:45,213 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 17:28:45,233 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:28:45,233 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 177 [2019-01-31 17:28:45,233 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:28:45,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 156 states [2019-01-31 17:28:45,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 156 interpolants. [2019-01-31 17:28:45,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13005, Invalid=18857, Unknown=0, NotChecked=0, Total=31862 [2019-01-31 17:28:45,236 INFO L87 Difference]: Start difference. First operand 232 states and 232 transitions. Second operand 156 states. [2019-01-31 17:28:45,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:28:45,855 INFO L93 Difference]: Finished difference Result 237 states and 237 transitions. [2019-01-31 17:28:45,856 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2019-01-31 17:28:45,856 INFO L78 Accepts]: Start accepts. Automaton has 156 states. Word has length 231 [2019-01-31 17:28:45,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:28:45,857 INFO L225 Difference]: With dead ends: 237 [2019-01-31 17:28:45,858 INFO L226 Difference]: Without dead ends: 236 [2019-01-31 17:28:45,859 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 537 GetRequests, 306 SyntacticMatches, 54 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23319 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=13005, Invalid=18857, Unknown=0, NotChecked=0, Total=31862 [2019-01-31 17:28:45,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2019-01-31 17:28:45,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 235. [2019-01-31 17:28:45,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 235 states. [2019-01-31 17:28:45,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 235 transitions. [2019-01-31 17:28:45,863 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 235 transitions. Word has length 231 [2019-01-31 17:28:45,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:28:45,863 INFO L480 AbstractCegarLoop]: Abstraction has 235 states and 235 transitions. [2019-01-31 17:28:45,863 INFO L481 AbstractCegarLoop]: Interpolant automaton has 156 states. [2019-01-31 17:28:45,863 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 235 transitions. [2019-01-31 17:28:45,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2019-01-31 17:28:45,864 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:28:45,864 INFO L402 BasicCegarLoop]: trace histogram [78, 77, 77, 1, 1] [2019-01-31 17:28:45,864 INFO L423 AbstractCegarLoop]: === Iteration 78 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:28:45,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:28:45,865 INFO L82 PathProgramCache]: Analyzing trace with hash 312464908, now seen corresponding path program 77 times [2019-01-31 17:28:45,865 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:28:45,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:28:45,865 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:28:45,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:28:45,866 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:28:45,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:28:48,671 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 17:28:48,671 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:28:48,671 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:28:48,671 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:28:48,672 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:28:48,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:28:48,672 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 17:28:48,682 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:28:48,682 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:28:49,053 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2019-01-31 17:28:49,054 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:28:49,062 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:28:49,065 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 17:28:49,066 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:28:49,075 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:28:49,076 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:28:52,763 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 17:28:52,763 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:28:57,051 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 17:28:57,070 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:28:57,070 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78, 78] total 178 [2019-01-31 17:28:57,071 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:28:57,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 158 states [2019-01-31 17:28:57,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2019-01-31 17:28:57,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13107, Invalid=19113, Unknown=0, NotChecked=0, Total=32220 [2019-01-31 17:28:57,073 INFO L87 Difference]: Start difference. First operand 235 states and 235 transitions. Second operand 158 states. [2019-01-31 17:28:57,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:28:57,747 INFO L93 Difference]: Finished difference Result 240 states and 240 transitions. [2019-01-31 17:28:57,747 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2019-01-31 17:28:57,747 INFO L78 Accepts]: Start accepts. Automaton has 158 states. Word has length 234 [2019-01-31 17:28:57,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:28:57,748 INFO L225 Difference]: With dead ends: 240 [2019-01-31 17:28:57,749 INFO L226 Difference]: Without dead ends: 239 [2019-01-31 17:28:57,749 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 544 GetRequests, 310 SyntacticMatches, 56 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23816 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=13107, Invalid=19113, Unknown=0, NotChecked=0, Total=32220 [2019-01-31 17:28:57,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2019-01-31 17:28:57,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 238. [2019-01-31 17:28:57,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2019-01-31 17:28:57,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 238 transitions. [2019-01-31 17:28:57,755 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 238 transitions. Word has length 234 [2019-01-31 17:28:57,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:28:57,755 INFO L480 AbstractCegarLoop]: Abstraction has 238 states and 238 transitions. [2019-01-31 17:28:57,755 INFO L481 AbstractCegarLoop]: Interpolant automaton has 158 states. [2019-01-31 17:28:57,755 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 238 transitions. [2019-01-31 17:28:57,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2019-01-31 17:28:57,756 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:28:57,756 INFO L402 BasicCegarLoop]: trace histogram [79, 78, 78, 1, 1] [2019-01-31 17:28:57,756 INFO L423 AbstractCegarLoop]: === Iteration 79 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:28:57,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:28:57,757 INFO L82 PathProgramCache]: Analyzing trace with hash 1447985312, now seen corresponding path program 78 times [2019-01-31 17:28:57,757 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:28:57,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:28:57,757 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:28:57,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:28:57,757 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:28:57,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:29:00,549 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 17:29:00,549 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:29:00,549 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:29:00,549 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:29:00,550 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:29:00,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:29:00,550 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 17:29:00,557 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:29:00,558 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:29:00,634 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:29:00,634 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:29:00,642 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:29:00,648 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 17:29:00,649 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:29:00,661 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 17:29:00,661 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:29:04,381 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 17:29:04,382 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:29:08,600 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 17:29:08,619 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:29:08,619 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 179 [2019-01-31 17:29:08,620 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:29:08,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 160 states [2019-01-31 17:29:08,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2019-01-31 17:29:08,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13209, Invalid=19371, Unknown=0, NotChecked=0, Total=32580 [2019-01-31 17:29:08,622 INFO L87 Difference]: Start difference. First operand 238 states and 238 transitions. Second operand 160 states. [2019-01-31 17:29:09,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:29:09,202 INFO L93 Difference]: Finished difference Result 243 states and 243 transitions. [2019-01-31 17:29:09,202 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2019-01-31 17:29:09,202 INFO L78 Accepts]: Start accepts. Automaton has 160 states. Word has length 237 [2019-01-31 17:29:09,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:29:09,203 INFO L225 Difference]: With dead ends: 243 [2019-01-31 17:29:09,203 INFO L226 Difference]: Without dead ends: 242 [2019-01-31 17:29:09,204 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 551 GetRequests, 314 SyntacticMatches, 58 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24313 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=13209, Invalid=19371, Unknown=0, NotChecked=0, Total=32580 [2019-01-31 17:29:09,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2019-01-31 17:29:09,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 241. [2019-01-31 17:29:09,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2019-01-31 17:29:09,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 241 transitions. [2019-01-31 17:29:09,210 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 241 transitions. Word has length 237 [2019-01-31 17:29:09,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:29:09,210 INFO L480 AbstractCegarLoop]: Abstraction has 241 states and 241 transitions. [2019-01-31 17:29:09,210 INFO L481 AbstractCegarLoop]: Interpolant automaton has 160 states. [2019-01-31 17:29:09,210 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 241 transitions. [2019-01-31 17:29:09,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2019-01-31 17:29:09,211 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:29:09,212 INFO L402 BasicCegarLoop]: trace histogram [80, 79, 79, 1, 1] [2019-01-31 17:29:09,212 INFO L423 AbstractCegarLoop]: === Iteration 80 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:29:09,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:29:09,212 INFO L82 PathProgramCache]: Analyzing trace with hash -1721049716, now seen corresponding path program 79 times [2019-01-31 17:29:09,212 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:29:09,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:29:09,213 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:29:09,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:29:09,213 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:29:09,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:29:12,481 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 17:29:12,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:29:12,482 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:29:12,482 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:29:12,482 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:29:12,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:29:12,482 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:29:12,490 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:29:12,490 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:29:12,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:29:12,562 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:29:12,564 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 17:29:12,564 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:29:12,579 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 17:29:12,579 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:29:16,092 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 17:29:16,092 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:29:20,301 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 17:29:20,319 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:29:20,320 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 180 [2019-01-31 17:29:20,320 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:29:20,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 162 states [2019-01-31 17:29:20,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 162 interpolants. [2019-01-31 17:29:20,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13311, Invalid=19631, Unknown=0, NotChecked=0, Total=32942 [2019-01-31 17:29:20,322 INFO L87 Difference]: Start difference. First operand 241 states and 241 transitions. Second operand 162 states. [2019-01-31 17:29:20,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:29:20,908 INFO L93 Difference]: Finished difference Result 246 states and 246 transitions. [2019-01-31 17:29:20,908 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2019-01-31 17:29:20,908 INFO L78 Accepts]: Start accepts. Automaton has 162 states. Word has length 240 [2019-01-31 17:29:20,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:29:20,909 INFO L225 Difference]: With dead ends: 246 [2019-01-31 17:29:20,909 INFO L226 Difference]: Without dead ends: 245 [2019-01-31 17:29:20,910 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 17:29:20,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2019-01-31 17:29:20,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 244. [2019-01-31 17:29:20,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2019-01-31 17:29:20,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 244 transitions. [2019-01-31 17:29:20,915 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 244 transitions. Word has length 240 [2019-01-31 17:29:20,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:29:20,915 INFO L480 AbstractCegarLoop]: Abstraction has 244 states and 244 transitions. [2019-01-31 17:29:20,915 INFO L481 AbstractCegarLoop]: Interpolant automaton has 162 states. [2019-01-31 17:29:20,915 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 244 transitions. [2019-01-31 17:29:20,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2019-01-31 17:29:20,916 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:29:20,916 INFO L402 BasicCegarLoop]: trace histogram [81, 80, 80, 1, 1] [2019-01-31 17:29:20,916 INFO L423 AbstractCegarLoop]: === Iteration 81 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:29:20,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:29:20,916 INFO L82 PathProgramCache]: Analyzing trace with hash 1527531808, now seen corresponding path program 80 times [2019-01-31 17:29:20,917 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:29:20,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:29:20,917 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:29:20,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:29:20,917 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:29:20,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:29:24,387 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 17:29:24,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:29:24,387 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:29:24,387 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:29:24,388 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:29:24,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:29:24,388 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 17:29:24,397 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:29:24,397 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:29:24,804 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 81 check-sat command(s) [2019-01-31 17:29:24,804 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:29:24,812 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:29:24,814 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 17:29:24,814 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:29:24,828 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 17:29:24,828 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:29:28,710 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 17:29:28,711 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:29:33,078 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 17:29:33,097 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:29:33,097 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 181 [2019-01-31 17:29:33,097 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:29:33,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 164 states [2019-01-31 17:29:33,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2019-01-31 17:29:33,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13413, Invalid=19893, Unknown=0, NotChecked=0, Total=33306 [2019-01-31 17:29:33,100 INFO L87 Difference]: Start difference. First operand 244 states and 244 transitions. Second operand 164 states. [2019-01-31 17:29:33,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:29:33,684 INFO L93 Difference]: Finished difference Result 249 states and 249 transitions. [2019-01-31 17:29:33,684 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2019-01-31 17:29:33,684 INFO L78 Accepts]: Start accepts. Automaton has 164 states. Word has length 243 [2019-01-31 17:29:33,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:29:33,685 INFO L225 Difference]: With dead ends: 249 [2019-01-31 17:29:33,685 INFO L226 Difference]: Without dead ends: 248 [2019-01-31 17:29:33,686 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 565 GetRequests, 322 SyntacticMatches, 62 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25307 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=13413, Invalid=19893, Unknown=0, NotChecked=0, Total=33306 [2019-01-31 17:29:33,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2019-01-31 17:29:33,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 247. [2019-01-31 17:29:33,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2019-01-31 17:29:33,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 247 transitions. [2019-01-31 17:29:33,691 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 247 transitions. Word has length 243 [2019-01-31 17:29:33,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:29:33,691 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 247 transitions. [2019-01-31 17:29:33,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has 164 states. [2019-01-31 17:29:33,691 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 247 transitions. [2019-01-31 17:29:33,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2019-01-31 17:29:33,692 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:29:33,692 INFO L402 BasicCegarLoop]: trace histogram [82, 81, 81, 1, 1] [2019-01-31 17:29:33,692 INFO L423 AbstractCegarLoop]: === Iteration 82 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:29:33,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:29:33,693 INFO L82 PathProgramCache]: Analyzing trace with hash 1521632524, now seen corresponding path program 81 times [2019-01-31 17:29:33,693 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:29:33,693 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:29:33,693 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:29:33,693 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:29:33,693 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:29:33,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:29:36,733 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 17:29:36,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:29:36,734 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:29:36,734 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:29:36,734 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:29:36,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:29:36,734 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 17:29:36,742 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:29:36,742 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:29:36,824 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:29:36,824 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:29:36,832 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:29:36,834 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 17:29:36,835 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:29:36,845 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 17:29:36,845 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:29:40,765 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 17:29:40,765 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:29:45,020 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 17:29:45,039 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:29:45,039 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82, 82] total 182 [2019-01-31 17:29:45,040 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:29:45,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 166 states [2019-01-31 17:29:45,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 166 interpolants. [2019-01-31 17:29:45,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13515, Invalid=20157, Unknown=0, NotChecked=0, Total=33672 [2019-01-31 17:29:45,043 INFO L87 Difference]: Start difference. First operand 247 states and 247 transitions. Second operand 166 states. [2019-01-31 17:29:45,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:29:45,637 INFO L93 Difference]: Finished difference Result 252 states and 252 transitions. [2019-01-31 17:29:45,638 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2019-01-31 17:29:45,638 INFO L78 Accepts]: Start accepts. Automaton has 166 states. Word has length 246 [2019-01-31 17:29:45,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:29:45,639 INFO L225 Difference]: With dead ends: 252 [2019-01-31 17:29:45,639 INFO L226 Difference]: Without dead ends: 251 [2019-01-31 17:29:45,640 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 326 SyntacticMatches, 64 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25804 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=13515, Invalid=20157, Unknown=0, NotChecked=0, Total=33672 [2019-01-31 17:29:45,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2019-01-31 17:29:45,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 250. [2019-01-31 17:29:45,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 250 states. [2019-01-31 17:29:45,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 250 transitions. [2019-01-31 17:29:45,644 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 250 transitions. Word has length 246 [2019-01-31 17:29:45,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:29:45,644 INFO L480 AbstractCegarLoop]: Abstraction has 250 states and 250 transitions. [2019-01-31 17:29:45,644 INFO L481 AbstractCegarLoop]: Interpolant automaton has 166 states. [2019-01-31 17:29:45,644 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 250 transitions. [2019-01-31 17:29:45,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2019-01-31 17:29:45,645 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:29:45,645 INFO L402 BasicCegarLoop]: trace histogram [83, 82, 82, 1, 1] [2019-01-31 17:29:45,645 INFO L423 AbstractCegarLoop]: === Iteration 83 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:29:45,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:29:45,646 INFO L82 PathProgramCache]: Analyzing trace with hash 1869722016, now seen corresponding path program 82 times [2019-01-31 17:29:45,646 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:29:45,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:29:45,646 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:29:45,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:29:45,647 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:29:45,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:29:48,985 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 17:29:48,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:29:48,985 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:29:48,985 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:29:48,985 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:29:48,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:29:48,985 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 17:29:48,994 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:29:48,994 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:29:49,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:29:49,069 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:29:49,071 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 17:29:49,072 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:29:49,081 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 17:29:49,081 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:29:53,093 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 17:29:53,094 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:29:57,138 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 17:29:57,156 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:29:57,157 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 183 [2019-01-31 17:29:57,157 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:29:57,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 168 states [2019-01-31 17:29:57,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 168 interpolants. [2019-01-31 17:29:57,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13617, Invalid=20423, Unknown=0, NotChecked=0, Total=34040 [2019-01-31 17:29:57,160 INFO L87 Difference]: Start difference. First operand 250 states and 250 transitions. Second operand 168 states. [2019-01-31 17:29:57,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:29:57,825 INFO L93 Difference]: Finished difference Result 255 states and 255 transitions. [2019-01-31 17:29:57,825 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2019-01-31 17:29:57,825 INFO L78 Accepts]: Start accepts. Automaton has 168 states. Word has length 249 [2019-01-31 17:29:57,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:29:57,826 INFO L225 Difference]: With dead ends: 255 [2019-01-31 17:29:57,826 INFO L226 Difference]: Without dead ends: 254 [2019-01-31 17:29:57,827 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 579 GetRequests, 330 SyntacticMatches, 66 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26301 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=13617, Invalid=20423, Unknown=0, NotChecked=0, Total=34040 [2019-01-31 17:29:57,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2019-01-31 17:29:57,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 253. [2019-01-31 17:29:57,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 253 states. [2019-01-31 17:29:57,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 253 transitions. [2019-01-31 17:29:57,832 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 253 transitions. Word has length 249 [2019-01-31 17:29:57,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:29:57,832 INFO L480 AbstractCegarLoop]: Abstraction has 253 states and 253 transitions. [2019-01-31 17:29:57,832 INFO L481 AbstractCegarLoop]: Interpolant automaton has 168 states. [2019-01-31 17:29:57,832 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 253 transitions. [2019-01-31 17:29:57,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2019-01-31 17:29:57,833 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:29:57,834 INFO L402 BasicCegarLoop]: trace histogram [84, 83, 83, 1, 1] [2019-01-31 17:29:57,834 INFO L423 AbstractCegarLoop]: === Iteration 84 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:29:57,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:29:57,834 INFO L82 PathProgramCache]: Analyzing trace with hash -542241652, now seen corresponding path program 83 times [2019-01-31 17:29:57,834 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:29:57,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:29:57,835 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:29:57,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:29:57,835 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:29:57,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:30:01,004 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 17:30:01,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:30:01,005 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:30:01,005 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:30:01,005 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:30:01,005 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:30:01,005 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 17:30:01,013 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:30:01,014 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:30:01,450 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 84 check-sat command(s) [2019-01-31 17:30:01,450 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:30:01,459 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:30:01,461 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-01-31 17:30:01,461 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:30:01,481 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 17:30:01,481 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:30:05,632 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 17:30:05,632 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:30:09,976 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 17:30:09,995 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:30:09,995 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 184 [2019-01-31 17:30:09,995 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:30:09,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 170 states [2019-01-31 17:30:09,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 170 interpolants. [2019-01-31 17:30:09,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13719, Invalid=20691, Unknown=0, NotChecked=0, Total=34410 [2019-01-31 17:30:09,998 INFO L87 Difference]: Start difference. First operand 253 states and 253 transitions. Second operand 170 states. [2019-01-31 17:30:10,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:30:10,608 INFO L93 Difference]: Finished difference Result 258 states and 258 transitions. [2019-01-31 17:30:10,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2019-01-31 17:30:10,608 INFO L78 Accepts]: Start accepts. Automaton has 170 states. Word has length 252 [2019-01-31 17:30:10,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:30:10,609 INFO L225 Difference]: With dead ends: 258 [2019-01-31 17:30:10,609 INFO L226 Difference]: Without dead ends: 257 [2019-01-31 17:30:10,610 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 334 SyntacticMatches, 68 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26798 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=13719, Invalid=20691, Unknown=0, NotChecked=0, Total=34410 [2019-01-31 17:30:10,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2019-01-31 17:30:10,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 256. [2019-01-31 17:30:10,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2019-01-31 17:30:10,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 256 transitions. [2019-01-31 17:30:10,615 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 256 transitions. Word has length 252 [2019-01-31 17:30:10,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:30:10,615 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 256 transitions. [2019-01-31 17:30:10,615 INFO L481 AbstractCegarLoop]: Interpolant automaton has 170 states. [2019-01-31 17:30:10,615 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 256 transitions. [2019-01-31 17:30:10,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2019-01-31 17:30:10,616 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:30:10,616 INFO L402 BasicCegarLoop]: trace histogram [85, 84, 84, 1, 1] [2019-01-31 17:30:10,617 INFO L423 AbstractCegarLoop]: === Iteration 85 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:30:10,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:30:10,617 INFO L82 PathProgramCache]: Analyzing trace with hash -549012960, now seen corresponding path program 84 times [2019-01-31 17:30:10,617 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:30:10,617 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:30:10,618 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:30:10,618 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:30:10,618 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:30:10,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:30:14,136 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 17:30:14,137 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:30:14,137 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:30:14,137 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:30:14,137 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:30:14,137 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:30:14,137 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:30:14,148 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:30:14,148 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:30:14,233 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:30:14,233 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:30:14,242 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:30:14,244 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 17:30:14,244 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:30:14,253 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 17:30:14,253 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:30:18,394 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 17:30:18,394 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:30:22,461 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 17:30:22,480 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:30:22,481 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 185 [2019-01-31 17:30:22,481 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:30:22,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 172 states [2019-01-31 17:30:22,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2019-01-31 17:30:22,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13821, Invalid=20961, Unknown=0, NotChecked=0, Total=34782 [2019-01-31 17:30:22,484 INFO L87 Difference]: Start difference. First operand 256 states and 256 transitions. Second operand 172 states. [2019-01-31 17:30:23,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:30:23,216 INFO L93 Difference]: Finished difference Result 261 states and 261 transitions. [2019-01-31 17:30:23,216 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2019-01-31 17:30:23,216 INFO L78 Accepts]: Start accepts. Automaton has 172 states. Word has length 255 [2019-01-31 17:30:23,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:30:23,217 INFO L225 Difference]: With dead ends: 261 [2019-01-31 17:30:23,218 INFO L226 Difference]: Without dead ends: 260 [2019-01-31 17:30:23,219 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 593 GetRequests, 338 SyntacticMatches, 70 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27295 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=13821, Invalid=20961, Unknown=0, NotChecked=0, Total=34782 [2019-01-31 17:30:23,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2019-01-31 17:30:23,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 259. [2019-01-31 17:30:23,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2019-01-31 17:30:23,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 259 transitions. [2019-01-31 17:30:23,225 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 259 transitions. Word has length 255 [2019-01-31 17:30:23,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:30:23,225 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 259 transitions. [2019-01-31 17:30:23,225 INFO L481 AbstractCegarLoop]: Interpolant automaton has 172 states. [2019-01-31 17:30:23,225 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 259 transitions. [2019-01-31 17:30:23,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2019-01-31 17:30:23,226 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:30:23,226 INFO L402 BasicCegarLoop]: trace histogram [86, 85, 85, 1, 1] [2019-01-31 17:30:23,226 INFO L423 AbstractCegarLoop]: === Iteration 86 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:30:23,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:30:23,227 INFO L82 PathProgramCache]: Analyzing trace with hash -409586676, now seen corresponding path program 85 times [2019-01-31 17:30:23,227 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:30:23,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:30:23,227 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:30:23,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:30:23,228 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:30:23,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:30:26,878 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 17:30:26,878 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:30:26,878 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:30:26,879 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:30:26,879 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:30:26,879 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:30:26,879 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:30:26,889 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:30:26,889 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:30:26,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:30:26,967 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:30:26,969 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 17:30:26,969 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:30:26,979 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 17:30:26,979 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:30:31,276 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 17:30:31,276 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:30:35,530 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 17:30:35,548 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:30:35,548 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86, 86] total 186 [2019-01-31 17:30:35,548 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:30:35,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 174 states [2019-01-31 17:30:35,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 174 interpolants. [2019-01-31 17:30:35,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13923, Invalid=21233, Unknown=0, NotChecked=0, Total=35156 [2019-01-31 17:30:35,552 INFO L87 Difference]: Start difference. First operand 259 states and 259 transitions. Second operand 174 states. [2019-01-31 17:30:36,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:30:36,252 INFO L93 Difference]: Finished difference Result 264 states and 264 transitions. [2019-01-31 17:30:36,252 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2019-01-31 17:30:36,253 INFO L78 Accepts]: Start accepts. Automaton has 174 states. Word has length 258 [2019-01-31 17:30:36,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:30:36,254 INFO L225 Difference]: With dead ends: 264 [2019-01-31 17:30:36,254 INFO L226 Difference]: Without dead ends: 263 [2019-01-31 17:30:36,255 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 17:30:36,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2019-01-31 17:30:36,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 262. [2019-01-31 17:30:36,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2019-01-31 17:30:36,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 262 transitions. [2019-01-31 17:30:36,259 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 262 transitions. Word has length 258 [2019-01-31 17:30:36,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:30:36,260 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 262 transitions. [2019-01-31 17:30:36,260 INFO L481 AbstractCegarLoop]: Interpolant automaton has 174 states. [2019-01-31 17:30:36,260 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 262 transitions. [2019-01-31 17:30:36,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2019-01-31 17:30:36,261 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:30:36,261 INFO L402 BasicCegarLoop]: trace histogram [87, 86, 86, 1, 1] [2019-01-31 17:30:36,261 INFO L423 AbstractCegarLoop]: === Iteration 87 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:30:36,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:30:36,262 INFO L82 PathProgramCache]: Analyzing trace with hash 5464736, now seen corresponding path program 86 times [2019-01-31 17:30:36,262 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:30:36,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:30:36,262 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:30:36,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:30:36,262 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:30:36,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:30:39,943 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 17:30:39,943 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:30:39,944 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:30:39,944 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:30:39,944 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:30:39,944 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:30:39,944 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 17:30:39,952 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:30:39,952 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:30:40,410 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 87 check-sat command(s) [2019-01-31 17:30:40,410 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:30:40,418 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:30:40,422 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 17:30:40,422 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:30:40,436 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 17:30:40,436 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:30:44,797 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 17:30:44,797 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:30:49,231 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 17:30:49,250 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:30:49,251 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 187 [2019-01-31 17:30:49,251 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:30:49,251 INFO L459 AbstractCegarLoop]: Interpolant automaton has 176 states [2019-01-31 17:30:49,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2019-01-31 17:30:49,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14025, Invalid=21507, Unknown=0, NotChecked=0, Total=35532 [2019-01-31 17:30:49,254 INFO L87 Difference]: Start difference. First operand 262 states and 262 transitions. Second operand 176 states. [2019-01-31 17:30:49,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:30:49,951 INFO L93 Difference]: Finished difference Result 267 states and 267 transitions. [2019-01-31 17:30:49,951 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2019-01-31 17:30:49,952 INFO L78 Accepts]: Start accepts. Automaton has 176 states. Word has length 261 [2019-01-31 17:30:49,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:30:49,953 INFO L225 Difference]: With dead ends: 267 [2019-01-31 17:30:49,953 INFO L226 Difference]: Without dead ends: 266 [2019-01-31 17:30:49,954 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 607 GetRequests, 346 SyntacticMatches, 74 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28289 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=14025, Invalid=21507, Unknown=0, NotChecked=0, Total=35532 [2019-01-31 17:30:49,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2019-01-31 17:30:49,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 265. [2019-01-31 17:30:49,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 265 states. [2019-01-31 17:30:49,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 265 transitions. [2019-01-31 17:30:49,958 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 265 transitions. Word has length 261 [2019-01-31 17:30:49,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:30:49,959 INFO L480 AbstractCegarLoop]: Abstraction has 265 states and 265 transitions. [2019-01-31 17:30:49,959 INFO L481 AbstractCegarLoop]: Interpolant automaton has 176 states. [2019-01-31 17:30:49,959 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 265 transitions. [2019-01-31 17:30:49,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2019-01-31 17:30:49,960 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:30:49,960 INFO L402 BasicCegarLoop]: trace histogram [88, 87, 87, 1, 1] [2019-01-31 17:30:49,960 INFO L423 AbstractCegarLoop]: === Iteration 88 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:30:49,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:30:49,960 INFO L82 PathProgramCache]: Analyzing trace with hash -408765556, now seen corresponding path program 87 times [2019-01-31 17:30:49,960 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:30:49,961 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:30:49,961 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:30:49,961 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:30:49,961 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:30:50,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:30:53,508 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 17:30:53,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:30:53,508 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:30:53,508 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:30:53,508 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:30:53,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:30:53,509 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 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 17:30:53,518 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:30:53,518 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:30:53,607 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:30:53,607 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:30:53,616 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:30:53,619 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 17:30:53,619 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:30:53,628 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 17:30:53,628 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:30:58,033 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 17:30:58,033 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:31:02,439 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 17:31:02,458 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:31:02,458 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88, 88] total 188 [2019-01-31 17:31:02,458 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:31:02,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 178 states [2019-01-31 17:31:02,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 178 interpolants. [2019-01-31 17:31:02,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14127, Invalid=21783, Unknown=0, NotChecked=0, Total=35910 [2019-01-31 17:31:02,462 INFO L87 Difference]: Start difference. First operand 265 states and 265 transitions. Second operand 178 states. [2019-01-31 17:31:03,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:31:03,091 INFO L93 Difference]: Finished difference Result 270 states and 270 transitions. [2019-01-31 17:31:03,092 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2019-01-31 17:31:03,092 INFO L78 Accepts]: Start accepts. Automaton has 178 states. Word has length 264 [2019-01-31 17:31:03,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:31:03,093 INFO L225 Difference]: With dead ends: 270 [2019-01-31 17:31:03,094 INFO L226 Difference]: Without dead ends: 269 [2019-01-31 17:31:03,095 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 614 GetRequests, 350 SyntacticMatches, 76 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28786 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=14127, Invalid=21783, Unknown=0, NotChecked=0, Total=35910 [2019-01-31 17:31:03,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2019-01-31 17:31:03,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 268. [2019-01-31 17:31:03,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2019-01-31 17:31:03,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 268 transitions. [2019-01-31 17:31:03,101 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 268 transitions. Word has length 264 [2019-01-31 17:31:03,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:31:03,102 INFO L480 AbstractCegarLoop]: Abstraction has 268 states and 268 transitions. [2019-01-31 17:31:03,102 INFO L481 AbstractCegarLoop]: Interpolant automaton has 178 states. [2019-01-31 17:31:03,102 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 268 transitions. [2019-01-31 17:31:03,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2019-01-31 17:31:03,103 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:31:03,103 INFO L402 BasicCegarLoop]: trace histogram [89, 88, 88, 1, 1] [2019-01-31 17:31:03,103 INFO L423 AbstractCegarLoop]: === Iteration 89 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:31:03,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:31:03,104 INFO L82 PathProgramCache]: Analyzing trace with hash -1302353120, now seen corresponding path program 88 times [2019-01-31 17:31:03,104 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:31:03,104 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:31:03,104 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:31:03,105 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:31:03,105 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:31:03,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:31:06,982 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 17:31:06,982 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:31:06,982 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:31:06,982 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:31:06,983 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:31:06,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:31:06,983 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 17:31:06,991 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:31:06,991 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:31:07,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:31:07,072 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:31:07,075 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 17:31:07,075 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:31:07,087 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 17:31:07,088 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:31:11,618 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 17:31:11,618 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:31:16,145 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 17:31:16,164 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:31:16,165 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 189 [2019-01-31 17:31:16,165 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:31:16,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 180 states [2019-01-31 17:31:16,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 180 interpolants. [2019-01-31 17:31:16,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14229, Invalid=22061, Unknown=0, NotChecked=0, Total=36290 [2019-01-31 17:31:16,168 INFO L87 Difference]: Start difference. First operand 268 states and 268 transitions. Second operand 180 states. [2019-01-31 17:31:16,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:31:16,956 INFO L93 Difference]: Finished difference Result 273 states and 273 transitions. [2019-01-31 17:31:16,956 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2019-01-31 17:31:16,956 INFO L78 Accepts]: Start accepts. Automaton has 180 states. Word has length 267 [2019-01-31 17:31:16,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:31:16,958 INFO L225 Difference]: With dead ends: 273 [2019-01-31 17:31:16,958 INFO L226 Difference]: Without dead ends: 272 [2019-01-31 17:31:16,959 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 621 GetRequests, 354 SyntacticMatches, 78 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29283 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=14229, Invalid=22061, Unknown=0, NotChecked=0, Total=36290 [2019-01-31 17:31:16,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2019-01-31 17:31:16,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 271. [2019-01-31 17:31:16,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 271 states. [2019-01-31 17:31:16,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 271 transitions. [2019-01-31 17:31:16,965 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 271 transitions. Word has length 267 [2019-01-31 17:31:16,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:31:16,965 INFO L480 AbstractCegarLoop]: Abstraction has 271 states and 271 transitions. [2019-01-31 17:31:16,965 INFO L481 AbstractCegarLoop]: Interpolant automaton has 180 states. [2019-01-31 17:31:16,965 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 271 transitions. [2019-01-31 17:31:16,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2019-01-31 17:31:16,966 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:31:16,966 INFO L402 BasicCegarLoop]: trace histogram [90, 89, 89, 1, 1] [2019-01-31 17:31:16,966 INFO L423 AbstractCegarLoop]: === Iteration 90 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:31:16,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:31:16,966 INFO L82 PathProgramCache]: Analyzing trace with hash -1962171636, now seen corresponding path program 89 times [2019-01-31 17:31:16,966 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:31:16,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:31:16,967 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:31:16,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:31:16,967 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:31:17,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:31:20,903 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 17:31:20,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:31:20,904 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:31:20,904 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:31:20,904 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:31:20,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:31:20,904 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 17:31:20,912 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:31:20,912 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:31:21,414 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 90 check-sat command(s) [2019-01-31 17:31:21,415 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:31:21,423 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:31:21,426 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 17:31:21,426 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:31:21,436 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 17:31:21,436 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:31:26,075 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 17:31:26,075 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:31:30,535 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 17:31:30,554 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:31:30,554 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90, 90] total 190 [2019-01-31 17:31:30,554 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:31:30,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 182 states [2019-01-31 17:31:30,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 182 interpolants. [2019-01-31 17:31:30,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14331, Invalid=22341, Unknown=0, NotChecked=0, Total=36672 [2019-01-31 17:31:30,557 INFO L87 Difference]: Start difference. First operand 271 states and 271 transitions. Second operand 182 states. [2019-01-31 17:31:31,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:31:31,303 INFO L93 Difference]: Finished difference Result 276 states and 276 transitions. [2019-01-31 17:31:31,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2019-01-31 17:31:31,304 INFO L78 Accepts]: Start accepts. Automaton has 182 states. Word has length 270 [2019-01-31 17:31:31,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:31:31,306 INFO L225 Difference]: With dead ends: 276 [2019-01-31 17:31:31,306 INFO L226 Difference]: Without dead ends: 275 [2019-01-31 17:31:31,307 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 628 GetRequests, 358 SyntacticMatches, 80 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29780 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=14331, Invalid=22341, Unknown=0, NotChecked=0, Total=36672 [2019-01-31 17:31:31,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2019-01-31 17:31:31,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 274. [2019-01-31 17:31:31,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2019-01-31 17:31:31,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 274 transitions. [2019-01-31 17:31:31,312 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 274 transitions. Word has length 270 [2019-01-31 17:31:31,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:31:31,312 INFO L480 AbstractCegarLoop]: Abstraction has 274 states and 274 transitions. [2019-01-31 17:31:31,312 INFO L481 AbstractCegarLoop]: Interpolant automaton has 182 states. [2019-01-31 17:31:31,312 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 274 transitions. [2019-01-31 17:31:31,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2019-01-31 17:31:31,313 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:31:31,313 INFO L402 BasicCegarLoop]: trace histogram [91, 90, 90, 1, 1] [2019-01-31 17:31:31,313 INFO L423 AbstractCegarLoop]: === Iteration 91 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:31:31,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:31:31,313 INFO L82 PathProgramCache]: Analyzing trace with hash -550268000, now seen corresponding path program 90 times [2019-01-31 17:31:31,314 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:31:31,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:31:31,314 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:31:31,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:31:31,314 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:31:31,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:31:35,321 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 17:31:35,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:31:35,322 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:31:35,322 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:31:35,322 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:31:35,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:31:35,322 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:31:35,332 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:31:35,332 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:31:35,445 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:31:35,445 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:31:35,455 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:31:35,457 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 17:31:35,457 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:31:35,467 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 17:31:35,467 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:31:39,932 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 17:31:39,932 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:31:44,302 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 17:31:44,321 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:31:44,321 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 191 [2019-01-31 17:31:44,321 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:31:44,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 184 states [2019-01-31 17:31:44,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 184 interpolants. [2019-01-31 17:31:44,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14433, Invalid=22623, Unknown=0, NotChecked=0, Total=37056 [2019-01-31 17:31:44,324 INFO L87 Difference]: Start difference. First operand 274 states and 274 transitions. Second operand 184 states. [2019-01-31 17:31:45,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:31:45,110 INFO L93 Difference]: Finished difference Result 279 states and 279 transitions. [2019-01-31 17:31:45,110 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2019-01-31 17:31:45,110 INFO L78 Accepts]: Start accepts. Automaton has 184 states. Word has length 273 [2019-01-31 17:31:45,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:31:45,112 INFO L225 Difference]: With dead ends: 279 [2019-01-31 17:31:45,112 INFO L226 Difference]: Without dead ends: 278 [2019-01-31 17:31:45,113 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 17:31:45,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2019-01-31 17:31:45,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 277. [2019-01-31 17:31:45,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2019-01-31 17:31:45,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 277 transitions. [2019-01-31 17:31:45,118 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 277 transitions. Word has length 273 [2019-01-31 17:31:45,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:31:45,118 INFO L480 AbstractCegarLoop]: Abstraction has 277 states and 277 transitions. [2019-01-31 17:31:45,118 INFO L481 AbstractCegarLoop]: Interpolant automaton has 184 states. [2019-01-31 17:31:45,118 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 277 transitions. [2019-01-31 17:31:45,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2019-01-31 17:31:45,119 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:31:45,119 INFO L402 BasicCegarLoop]: trace histogram [92, 91, 91, 1, 1] [2019-01-31 17:31:45,119 INFO L423 AbstractCegarLoop]: === Iteration 92 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:31:45,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:31:45,120 INFO L82 PathProgramCache]: Analyzing trace with hash 856222348, now seen corresponding path program 91 times [2019-01-31 17:31:45,120 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:31:45,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:31:45,120 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:31:45,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:31:45,121 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:31:45,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:31:48,913 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 17:31:48,913 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:31:48,914 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:31:48,914 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:31:48,914 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:31:48,914 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:31:48,914 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 17:31:48,922 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:31:48,923 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:31:48,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:31:49,006 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:31:49,009 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 17:31:49,009 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:31:49,020 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 17:31:49,020 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:31:53,865 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 17:31:53,865 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:31:58,197 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 17:31:58,215 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:31:58,215 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92, 92] total 192 [2019-01-31 17:31:58,216 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:31:58,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 186 states [2019-01-31 17:31:58,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 186 interpolants. [2019-01-31 17:31:58,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14535, Invalid=22907, Unknown=0, NotChecked=0, Total=37442 [2019-01-31 17:31:58,218 INFO L87 Difference]: Start difference. First operand 277 states and 277 transitions. Second operand 186 states. [2019-01-31 17:31:58,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:31:58,926 INFO L93 Difference]: Finished difference Result 282 states and 282 transitions. [2019-01-31 17:31:58,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2019-01-31 17:31:58,928 INFO L78 Accepts]: Start accepts. Automaton has 186 states. Word has length 276 [2019-01-31 17:31:58,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:31:58,930 INFO L225 Difference]: With dead ends: 282 [2019-01-31 17:31:58,931 INFO L226 Difference]: Without dead ends: 281 [2019-01-31 17:31:58,932 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 642 GetRequests, 366 SyntacticMatches, 84 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30774 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=14535, Invalid=22907, Unknown=0, NotChecked=0, Total=37442 [2019-01-31 17:31:58,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2019-01-31 17:31:58,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 280. [2019-01-31 17:31:58,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2019-01-31 17:31:58,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 280 transitions. [2019-01-31 17:31:58,936 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 280 transitions. Word has length 276 [2019-01-31 17:31:58,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:31:58,936 INFO L480 AbstractCegarLoop]: Abstraction has 280 states and 280 transitions. [2019-01-31 17:31:58,937 INFO L481 AbstractCegarLoop]: Interpolant automaton has 186 states. [2019-01-31 17:31:58,937 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 280 transitions. [2019-01-31 17:31:58,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2019-01-31 17:31:58,937 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:31:58,938 INFO L402 BasicCegarLoop]: trace histogram [93, 92, 92, 1, 1] [2019-01-31 17:31:58,938 INFO L423 AbstractCegarLoop]: === Iteration 93 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:31:58,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:31:58,938 INFO L82 PathProgramCache]: Analyzing trace with hash -90760160, now seen corresponding path program 92 times [2019-01-31 17:31:58,938 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:31:58,939 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:31:58,939 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:31:58,939 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:31:58,939 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:31:58,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:32:03,054 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 17:32:03,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:32:03,054 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:32:03,054 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:32:03,054 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:32:03,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:32:03,054 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 17:32:03,063 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:32:03,063 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:32:03,615 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 93 check-sat command(s) [2019-01-31 17:32:03,615 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:32:03,624 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:32:03,626 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 17:32:03,626 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:32:03,638 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 17:32:03,638 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:32:08,647 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 17:32:08,647 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:32:13,005 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 17:32:13,024 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:32:13,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 193 [2019-01-31 17:32:13,025 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:32:13,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 188 states [2019-01-31 17:32:13,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 188 interpolants. [2019-01-31 17:32:13,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14637, Invalid=23193, Unknown=0, NotChecked=0, Total=37830 [2019-01-31 17:32:13,028 INFO L87 Difference]: Start difference. First operand 280 states and 280 transitions. Second operand 188 states. [2019-01-31 17:32:13,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:32:13,847 INFO L93 Difference]: Finished difference Result 285 states and 285 transitions. [2019-01-31 17:32:13,848 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2019-01-31 17:32:13,848 INFO L78 Accepts]: Start accepts. Automaton has 188 states. Word has length 279 [2019-01-31 17:32:13,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:32:13,849 INFO L225 Difference]: With dead ends: 285 [2019-01-31 17:32:13,849 INFO L226 Difference]: Without dead ends: 284 [2019-01-31 17:32:13,851 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 649 GetRequests, 370 SyntacticMatches, 86 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31271 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=14637, Invalid=23193, Unknown=0, NotChecked=0, Total=37830 [2019-01-31 17:32:13,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2019-01-31 17:32:13,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 283. [2019-01-31 17:32:13,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 283 states. [2019-01-31 17:32:13,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 283 transitions. [2019-01-31 17:32:13,856 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 283 transitions. Word has length 279 [2019-01-31 17:32:13,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:32:13,856 INFO L480 AbstractCegarLoop]: Abstraction has 283 states and 283 transitions. [2019-01-31 17:32:13,856 INFO L481 AbstractCegarLoop]: Interpolant automaton has 188 states. [2019-01-31 17:32:13,856 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 283 transitions. [2019-01-31 17:32:13,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 283 [2019-01-31 17:32:13,857 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:32:13,857 INFO L402 BasicCegarLoop]: trace histogram [94, 93, 93, 1, 1] [2019-01-31 17:32:13,857 INFO L423 AbstractCegarLoop]: === Iteration 94 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:32:13,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:32:13,858 INFO L82 PathProgramCache]: Analyzing trace with hash 1993511436, now seen corresponding path program 93 times [2019-01-31 17:32:13,858 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:32:13,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:32:13,858 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:32:13,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:32:13,858 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:32:13,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:32:18,087 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 17:32:18,087 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:32:18,087 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:32:18,087 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:32:18,087 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:32:18,087 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:32:18,088 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 17:32:18,101 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:32:18,102 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:32:18,198 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:32:18,198 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:32:18,209 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:32:18,211 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 17:32:18,212 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:32:18,222 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 17:32:18,223 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:32:23,369 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 17:32:23,369 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:32:27,805 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 17:32:27,825 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:32:27,825 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94, 94] total 194 [2019-01-31 17:32:27,825 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:32:27,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 190 states [2019-01-31 17:32:27,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2019-01-31 17:32:27,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14739, Invalid=23481, Unknown=0, NotChecked=0, Total=38220 [2019-01-31 17:32:27,829 INFO L87 Difference]: Start difference. First operand 283 states and 283 transitions. Second operand 190 states. [2019-01-31 17:32:28,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:32:28,602 INFO L93 Difference]: Finished difference Result 288 states and 288 transitions. [2019-01-31 17:32:28,602 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2019-01-31 17:32:28,602 INFO L78 Accepts]: Start accepts. Automaton has 190 states. Word has length 282 [2019-01-31 17:32:28,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:32:28,604 INFO L225 Difference]: With dead ends: 288 [2019-01-31 17:32:28,604 INFO L226 Difference]: Without dead ends: 287 [2019-01-31 17:32:28,606 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 656 GetRequests, 374 SyntacticMatches, 88 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31768 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=14739, Invalid=23481, Unknown=0, NotChecked=0, Total=38220 [2019-01-31 17:32:28,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2019-01-31 17:32:28,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 286. [2019-01-31 17:32:28,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2019-01-31 17:32:28,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 286 transitions. [2019-01-31 17:32:28,612 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 286 transitions. Word has length 282 [2019-01-31 17:32:28,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:32:28,612 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 286 transitions. [2019-01-31 17:32:28,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has 190 states. [2019-01-31 17:32:28,612 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 286 transitions. [2019-01-31 17:32:28,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2019-01-31 17:32:28,613 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:32:28,613 INFO L402 BasicCegarLoop]: trace histogram [95, 94, 94, 1, 1] [2019-01-31 17:32:28,613 INFO L423 AbstractCegarLoop]: === Iteration 95 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:32:28,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:32:28,613 INFO L82 PathProgramCache]: Analyzing trace with hash -2108537696, now seen corresponding path program 94 times [2019-01-31 17:32:28,613 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:32:28,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:32:28,614 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:32:28,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:32:28,614 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:32:28,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:32:32,859 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 17:32:32,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:32:32,859 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:32:32,860 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:32:32,860 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:32:32,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:32:32,860 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 17:32:32,869 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:32:32,869 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:32:32,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:32:32,954 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:32:32,956 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 17:32:32,956 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:32:32,966 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:32:32,966 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:32:38,039 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 17:32:38,039 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:32:42,504 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 17:32:42,522 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:32:42,522 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 195 [2019-01-31 17:32:42,522 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:32:42,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 192 states [2019-01-31 17:32:42,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2019-01-31 17:32:42,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14841, Invalid=23771, Unknown=0, NotChecked=0, Total=38612 [2019-01-31 17:32:42,525 INFO L87 Difference]: Start difference. First operand 286 states and 286 transitions. Second operand 192 states. [2019-01-31 17:32:43,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:32:43,226 INFO L93 Difference]: Finished difference Result 291 states and 291 transitions. [2019-01-31 17:32:43,227 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2019-01-31 17:32:43,227 INFO L78 Accepts]: Start accepts. Automaton has 192 states. Word has length 285 [2019-01-31 17:32:43,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:32:43,229 INFO L225 Difference]: With dead ends: 291 [2019-01-31 17:32:43,229 INFO L226 Difference]: Without dead ends: 290 [2019-01-31 17:32:43,230 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 663 GetRequests, 378 SyntacticMatches, 90 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32265 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=14841, Invalid=23771, Unknown=0, NotChecked=0, Total=38612 [2019-01-31 17:32:43,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2019-01-31 17:32:43,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 289. [2019-01-31 17:32:43,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2019-01-31 17:32:43,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 289 transitions. [2019-01-31 17:32:43,235 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 289 transitions. Word has length 285 [2019-01-31 17:32:43,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:32:43,235 INFO L480 AbstractCegarLoop]: Abstraction has 289 states and 289 transitions. [2019-01-31 17:32:43,235 INFO L481 AbstractCegarLoop]: Interpolant automaton has 192 states. [2019-01-31 17:32:43,236 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 289 transitions. [2019-01-31 17:32:43,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2019-01-31 17:32:43,237 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:32:43,237 INFO L402 BasicCegarLoop]: trace histogram [96, 95, 95, 1, 1] [2019-01-31 17:32:43,237 INFO L423 AbstractCegarLoop]: === Iteration 96 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:32:43,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:32:43,238 INFO L82 PathProgramCache]: Analyzing trace with hash -1549756020, now seen corresponding path program 95 times [2019-01-31 17:32:43,238 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:32:43,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:32:43,238 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:32:43,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:32:43,238 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:32:43,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:32:47,385 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 17:32:47,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:32:47,386 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:32:47,386 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:32:47,386 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:32:47,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:32:47,386 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 17:32:47,395 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:32:47,395 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:32:47,974 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 96 check-sat command(s) [2019-01-31 17:32:47,974 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:32:47,983 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:32:47,985 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 17:32:47,986 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:32:47,996 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 17:32:47,996 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:32:53,107 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 17:32:53,108 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:32:57,623 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 17:32:57,643 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:32:57,643 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 196 [2019-01-31 17:32:57,643 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:32:57,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 194 states [2019-01-31 17:32:57,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2019-01-31 17:32:57,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14943, Invalid=24063, Unknown=0, NotChecked=0, Total=39006 [2019-01-31 17:32:57,646 INFO L87 Difference]: Start difference. First operand 289 states and 289 transitions. Second operand 194 states. [2019-01-31 17:32:58,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:32:58,457 INFO L93 Difference]: Finished difference Result 294 states and 294 transitions. [2019-01-31 17:32:58,457 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2019-01-31 17:32:58,457 INFO L78 Accepts]: Start accepts. Automaton has 194 states. Word has length 288 [2019-01-31 17:32:58,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:32:58,459 INFO L225 Difference]: With dead ends: 294 [2019-01-31 17:32:58,459 INFO L226 Difference]: Without dead ends: 293 [2019-01-31 17:32:58,461 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 670 GetRequests, 382 SyntacticMatches, 92 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32762 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=14943, Invalid=24063, Unknown=0, NotChecked=0, Total=39006 [2019-01-31 17:32:58,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2019-01-31 17:32:58,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 292. [2019-01-31 17:32:58,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2019-01-31 17:32:58,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 292 transitions. [2019-01-31 17:32:58,465 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 292 transitions. Word has length 288 [2019-01-31 17:32:58,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:32:58,466 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 292 transitions. [2019-01-31 17:32:58,466 INFO L481 AbstractCegarLoop]: Interpolant automaton has 194 states. [2019-01-31 17:32:58,466 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 292 transitions. [2019-01-31 17:32:58,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2019-01-31 17:32:58,467 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:32:58,467 INFO L402 BasicCegarLoop]: trace histogram [97, 96, 96, 1, 1] [2019-01-31 17:32:58,468 INFO L423 AbstractCegarLoop]: === Iteration 97 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:32:58,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:32:58,468 INFO L82 PathProgramCache]: Analyzing trace with hash 2116881696, now seen corresponding path program 96 times [2019-01-31 17:32:58,468 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:32:58,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:32:58,469 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:32:58,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:32:58,469 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:32:58,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:33:02,946 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 17:33:02,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:33:02,947 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:33:02,947 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:33:02,947 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:33:02,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:33:02,947 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 17:33:02,973 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:33:02,973 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:33:03,070 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:33:03,070 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:33:03,080 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:33:03,082 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 17:33:03,083 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:33:03,091 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 17:33:03,091 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:33:08,466 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 17:33:08,467 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:33:13,037 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 17:33:13,056 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:33:13,056 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 197 [2019-01-31 17:33:13,056 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:33:13,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 196 states [2019-01-31 17:33:13,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 196 interpolants. [2019-01-31 17:33:13,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15045, Invalid=24357, Unknown=0, NotChecked=0, Total=39402 [2019-01-31 17:33:13,059 INFO L87 Difference]: Start difference. First operand 292 states and 292 transitions. Second operand 196 states. [2019-01-31 17:33:13,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:33:13,761 INFO L93 Difference]: Finished difference Result 297 states and 297 transitions. [2019-01-31 17:33:13,762 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2019-01-31 17:33:13,762 INFO L78 Accepts]: Start accepts. Automaton has 196 states. Word has length 291 [2019-01-31 17:33:13,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:33:13,764 INFO L225 Difference]: With dead ends: 297 [2019-01-31 17:33:13,764 INFO L226 Difference]: Without dead ends: 296 [2019-01-31 17:33:13,765 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 677 GetRequests, 386 SyntacticMatches, 94 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33259 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=15045, Invalid=24357, Unknown=0, NotChecked=0, Total=39402 [2019-01-31 17:33:13,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2019-01-31 17:33:13,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 295. [2019-01-31 17:33:13,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 295 states. [2019-01-31 17:33:13,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 295 transitions. [2019-01-31 17:33:13,770 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 295 transitions. Word has length 291 [2019-01-31 17:33:13,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:33:13,770 INFO L480 AbstractCegarLoop]: Abstraction has 295 states and 295 transitions. [2019-01-31 17:33:13,770 INFO L481 AbstractCegarLoop]: Interpolant automaton has 196 states. [2019-01-31 17:33:13,770 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 295 transitions. [2019-01-31 17:33:13,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2019-01-31 17:33:13,771 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:33:13,772 INFO L402 BasicCegarLoop]: trace histogram [98, 97, 97, 1, 1] [2019-01-31 17:33:13,772 INFO L423 AbstractCegarLoop]: === Iteration 98 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:33:13,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:33:13,772 INFO L82 PathProgramCache]: Analyzing trace with hash 1017839884, now seen corresponding path program 97 times [2019-01-31 17:33:13,772 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:33:13,772 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:33:13,773 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:33:13,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:33:13,773 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:33:13,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:33:18,339 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 17:33:18,339 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:33:18,340 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:33:18,340 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:33:18,340 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:33:18,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:33:18,340 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 17:33:18,349 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:33:18,349 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:33:18,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:33:18,439 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:33:18,441 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 17:33:18,441 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:33:18,454 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 17:33:18,454 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:33:23,839 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 17:33:23,839 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:33:28,306 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 17:33:28,325 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:33:28,326 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98, 98] total 198 [2019-01-31 17:33:28,326 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:33:28,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 198 states [2019-01-31 17:33:28,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 198 interpolants. [2019-01-31 17:33:28,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15147, Invalid=24653, Unknown=0, NotChecked=0, Total=39800 [2019-01-31 17:33:28,330 INFO L87 Difference]: Start difference. First operand 295 states and 295 transitions. Second operand 198 states. [2019-01-31 17:33:29,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:33:29,169 INFO L93 Difference]: Finished difference Result 300 states and 300 transitions. [2019-01-31 17:33:29,169 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2019-01-31 17:33:29,169 INFO L78 Accepts]: Start accepts. Automaton has 198 states. Word has length 294 [2019-01-31 17:33:29,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:33:29,170 INFO L225 Difference]: With dead ends: 300 [2019-01-31 17:33:29,171 INFO L226 Difference]: Without dead ends: 299 [2019-01-31 17:33:29,172 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 390 SyntacticMatches, 96 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33756 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=15147, Invalid=24653, Unknown=0, NotChecked=0, Total=39800 [2019-01-31 17:33:29,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2019-01-31 17:33:29,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 298. [2019-01-31 17:33:29,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2019-01-31 17:33:29,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 298 transitions. [2019-01-31 17:33:29,178 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 298 transitions. Word has length 294 [2019-01-31 17:33:29,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:33:29,178 INFO L480 AbstractCegarLoop]: Abstraction has 298 states and 298 transitions. [2019-01-31 17:33:29,178 INFO L481 AbstractCegarLoop]: Interpolant automaton has 198 states. [2019-01-31 17:33:29,178 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 298 transitions. [2019-01-31 17:33:29,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2019-01-31 17:33:29,179 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:33:29,179 INFO L402 BasicCegarLoop]: trace histogram [99, 98, 98, 1, 1] [2019-01-31 17:33:29,179 INFO L423 AbstractCegarLoop]: === Iteration 99 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:33:29,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:33:29,179 INFO L82 PathProgramCache]: Analyzing trace with hash -1084000, now seen corresponding path program 98 times [2019-01-31 17:33:29,180 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:33:29,180 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:33:29,180 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:33:29,180 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:33:29,180 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:33:29,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:33:33,695 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 17:33:33,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:33:33,696 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:33:33,696 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:33:33,696 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:33:33,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:33:33,696 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 17:33:33,705 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-31 17:33:33,705 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-31 17:33:34,320 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 99 check-sat command(s) [2019-01-31 17:33:34,320 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:33:34,330 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:33:34,336 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 17:33:34,336 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:33:34,399 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 17:33:34,400 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:33:39,779 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 17:33:39,779 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:33:44,149 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 17:33:44,168 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:33:44,169 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 199 [2019-01-31 17:33:44,169 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:33:44,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 200 states [2019-01-31 17:33:44,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 200 interpolants. [2019-01-31 17:33:44,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15249, Invalid=24951, Unknown=0, NotChecked=0, Total=40200 [2019-01-31 17:33:44,172 INFO L87 Difference]: Start difference. First operand 298 states and 298 transitions. Second operand 200 states. [2019-01-31 17:33:45,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:33:45,045 INFO L93 Difference]: Finished difference Result 303 states and 303 transitions. [2019-01-31 17:33:45,046 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2019-01-31 17:33:45,046 INFO L78 Accepts]: Start accepts. Automaton has 200 states. Word has length 297 [2019-01-31 17:33:45,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:33:45,047 INFO L225 Difference]: With dead ends: 303 [2019-01-31 17:33:45,047 INFO L226 Difference]: Without dead ends: 302 [2019-01-31 17:33:45,048 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 691 GetRequests, 394 SyntacticMatches, 98 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34253 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=15249, Invalid=24951, Unknown=0, NotChecked=0, Total=40200 [2019-01-31 17:33:45,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2019-01-31 17:33:45,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 301. [2019-01-31 17:33:45,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 301 states. [2019-01-31 17:33:45,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 301 transitions. [2019-01-31 17:33:45,056 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 301 transitions. Word has length 297 [2019-01-31 17:33:45,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:33:45,057 INFO L480 AbstractCegarLoop]: Abstraction has 301 states and 301 transitions. [2019-01-31 17:33:45,057 INFO L481 AbstractCegarLoop]: Interpolant automaton has 200 states. [2019-01-31 17:33:45,057 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 301 transitions. [2019-01-31 17:33:45,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2019-01-31 17:33:45,058 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:33:45,058 INFO L402 BasicCegarLoop]: trace histogram [100, 99, 99, 1, 1] [2019-01-31 17:33:45,059 INFO L423 AbstractCegarLoop]: === Iteration 100 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:33:45,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:33:45,059 INFO L82 PathProgramCache]: Analyzing trace with hash 2066335884, now seen corresponding path program 99 times [2019-01-31 17:33:45,059 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:33:45,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:33:45,060 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:33:45,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:33:45,060 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:33:45,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:33:50,102 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 17:33:50,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:33:50,102 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:33:50,102 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:33:50,102 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:33:50,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:33:50,103 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 17:33:50,112 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-31 17:33:50,112 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-31 17:33:50,237 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-31 17:33:50,237 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-31 17:33:50,250 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:33:50,267 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 17:33:50,267 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-31 17:33:50,289 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-31 17:33:50,290 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:13, output treesize:9 [2019-01-31 17:33:55,910 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 17:33:55,910 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:34:00,289 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 17:34:00,309 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-31 17:34:00,309 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100, 100] total 200 [2019-01-31 17:34:00,309 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-31 17:34:00,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 202 states [2019-01-31 17:34:00,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 202 interpolants. [2019-01-31 17:34:00,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15351, Invalid=25251, Unknown=0, NotChecked=0, Total=40602 [2019-01-31 17:34:00,313 INFO L87 Difference]: Start difference. First operand 301 states and 301 transitions. Second operand 202 states. [2019-01-31 17:34:01,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:34:01,116 INFO L93 Difference]: Finished difference Result 306 states and 306 transitions. [2019-01-31 17:34:01,116 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2019-01-31 17:34:01,116 INFO L78 Accepts]: Start accepts. Automaton has 202 states. Word has length 300 [2019-01-31 17:34:01,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:34:01,118 INFO L225 Difference]: With dead ends: 306 [2019-01-31 17:34:01,118 INFO L226 Difference]: Without dead ends: 305 [2019-01-31 17:34:01,119 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 399 SyntacticMatches, 99 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34551 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=15351, Invalid=25251, Unknown=0, NotChecked=0, Total=40602 [2019-01-31 17:34:01,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2019-01-31 17:34:01,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 304. [2019-01-31 17:34:01,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2019-01-31 17:34:01,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 304 transitions. [2019-01-31 17:34:01,124 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 304 transitions. Word has length 300 [2019-01-31 17:34:01,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:34:01,125 INFO L480 AbstractCegarLoop]: Abstraction has 304 states and 304 transitions. [2019-01-31 17:34:01,125 INFO L481 AbstractCegarLoop]: Interpolant automaton has 202 states. [2019-01-31 17:34:01,125 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 304 transitions. [2019-01-31 17:34:01,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 304 [2019-01-31 17:34:01,126 INFO L394 BasicCegarLoop]: Found error trace [2019-01-31 17:34:01,126 INFO L402 BasicCegarLoop]: trace histogram [101, 100, 100, 1, 1] [2019-01-31 17:34:01,127 INFO L423 AbstractCegarLoop]: === Iteration 101 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2019-01-31 17:34:01,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-31 17:34:01,127 INFO L82 PathProgramCache]: Analyzing trace with hash -1553891808, now seen corresponding path program 100 times [2019-01-31 17:34:01,127 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-31 17:34:01,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:34:01,128 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-31 17:34:01,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-31 17:34:01,128 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-31 17:34:01,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:34:05,738 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 17:34:05,739 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:34:05,739 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-31 17:34:05,739 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-31 17:34:05,739 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-31 17:34:05,739 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-31 17:34:05,739 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 17:34:05,747 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-31 17:34:05,747 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-31 17:34:05,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-31 17:34:05,828 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-31 17:34:05,940 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 17:34:05,941 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-31 17:34:10,203 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 17:34:10,223 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-01-31 17:34:10,223 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [102, 102] imperfect sequences [102] total 103 [2019-01-31 17:34:10,223 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-01-31 17:34:10,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 103 states [2019-01-31 17:34:10,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2019-01-31 17:34:10,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5256, Invalid=5456, Unknown=0, NotChecked=0, Total=10712 [2019-01-31 17:34:10,225 INFO L87 Difference]: Start difference. First operand 304 states and 304 transitions. Second operand 103 states. [2019-01-31 17:34:10,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-31 17:34:10,964 INFO L93 Difference]: Finished difference Result 306 states and 306 transitions. [2019-01-31 17:34:10,964 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2019-01-31 17:34:10,964 INFO L78 Accepts]: Start accepts. Automaton has 103 states. Word has length 303 [2019-01-31 17:34:10,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-31 17:34:10,965 INFO L225 Difference]: With dead ends: 306 [2019-01-31 17:34:10,965 INFO L226 Difference]: Without dead ends: 0 [2019-01-31 17:34:10,967 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 706 GetRequests, 504 SyntacticMatches, 100 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5544 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=5256, Invalid=5456, Unknown=0, NotChecked=0, Total=10712 [2019-01-31 17:34:10,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-01-31 17:34:10,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-01-31 17:34:10,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-01-31 17:34:10,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-01-31 17:34:10,968 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 303 [2019-01-31 17:34:10,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-31 17:34:10,969 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-01-31 17:34:10,969 INFO L481 AbstractCegarLoop]: Interpolant automaton has 103 states. [2019-01-31 17:34:10,969 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-01-31 17:34:10,969 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-01-31 17:34:10,973 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2019-01-31 17:34:11,103 WARN L181 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 511 [2019-01-31 17:34:14,248 WARN L181 SmtUtils]: Spent 3.14 s on a formula simplification. DAG size of input: 511 DAG size of output: 509 [2019-01-31 17:34:14,256 INFO L448 ceAbstractionStarter]: For program point mainENTRY(lines 2 23) no Hoare annotation was computed. [2019-01-31 17:34:14,257 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 2 23) no Hoare annotation was computed. [2019-01-31 17:34:14,257 INFO L448 ceAbstractionStarter]: For program point L15(line 15) no Hoare annotation was computed. [2019-01-31 17:34:14,257 INFO L448 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONASSERT(line 15) no Hoare annotation was computed. [2019-01-31 17:34:14,257 INFO L448 ceAbstractionStarter]: For program point L14(lines 14 19) no Hoare annotation was computed. [2019-01-31 17:34:14,259 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 17:34:14,260 INFO L448 ceAbstractionStarter]: For program point L12-2(lines 2 23) no Hoare annotation was computed. [2019-01-31 17:34:14,303 INFO L202 PluginConnector]: Adding new model PointerIncrement-simplified03.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 31.01 05:34:14 BoogieIcfgContainer [2019-01-31 17:34:14,303 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-01-31 17:34:14,304 INFO L168 Benchmark]: Toolchain (without parser) took 731570.97 ms. Allocated memory was 138.9 MB in the beginning and 2.4 GB in the end (delta: 2.3 GB). Free memory was 105.2 MB in the beginning and 318.5 MB in the end (delta: -213.3 MB). Peak memory consumption was 2.1 GB. Max. memory is 7.1 GB. [2019-01-31 17:34:14,305 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.32 ms. Allocated memory is still 138.9 MB. Free memory is still 106.6 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-01-31 17:34:14,305 INFO L168 Benchmark]: Boogie Procedure Inliner took 57.67 ms. Allocated memory is still 138.9 MB. Free memory was 105.2 MB in the beginning and 103.0 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.2 MB. Max. memory is 7.1 GB. [2019-01-31 17:34:14,305 INFO L168 Benchmark]: Boogie Preprocessor took 27.49 ms. Allocated memory is still 138.9 MB. Free memory was 103.0 MB in the beginning and 101.8 MB in the end (delta: 1.1 MB). Peak memory consumption was 1.1 MB. Max. memory is 7.1 GB. [2019-01-31 17:34:14,305 INFO L168 Benchmark]: RCFGBuilder took 297.29 ms. Allocated memory is still 138.9 MB. Free memory was 101.6 MB in the beginning and 91.7 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2019-01-31 17:34:14,306 INFO L168 Benchmark]: TraceAbstraction took 731184.27 ms. Allocated memory was 138.9 MB in the beginning and 2.4 GB in the end (delta: 2.3 GB). Free memory was 91.5 MB in the beginning and 318.5 MB in the end (delta: -227.0 MB). Peak memory consumption was 2.0 GB. Max. memory is 7.1 GB. [2019-01-31 17:34:14,307 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 0.32 ms. Allocated memory is still 138.9 MB. Free memory is still 106.6 MB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 57.67 ms. Allocated memory is still 138.9 MB. Free memory was 105.2 MB in the beginning and 103.0 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 27.49 ms. Allocated memory is still 138.9 MB. Free memory was 103.0 MB in the beginning and 101.8 MB in the end (delta: 1.1 MB). Peak memory consumption was 1.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 297.29 ms. Allocated memory is still 138.9 MB. Free memory was 101.6 MB in the beginning and 91.7 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 731184.27 ms. Allocated memory was 138.9 MB in the beginning and 2.4 GB in the end (delta: 2.3 GB). Free memory was 91.5 MB in the beginning and 318.5 MB in the end (delta: -227.0 MB). Peak memory consumption was 2.0 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, 731.0s OverallTime, 101 OverallIterations, 101 TraceHistogramMax, 41.7s AutomataDifference, 0.0s DeadEndRemovalTime, 3.2s HoareAnnotationTime, HoareTripleCheckerStatistics: 202 SDtfs, 7321 SDslu, 1 SDs, 0 SdLazy, 27597 SolverSat, 353 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 26.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 35852 GetRequests, 20503 SyntacticMatches, 2649 SemanticMatches, 12700 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1303168 ImplicationChecksByTransitivity, 631.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=304occurred in iteration=100, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 8.8s 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, 12.5s SatisfiabilityAnalysisTime, 655.6s 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...