java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_compound_exp_cong.epf -i ../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/LargeConstant-ForwardSuccess.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-b7bd044-m [2019-01-20 09:57:33,551 INFO L170 SettingsManager]: Resetting all preferences to default values... [2019-01-20 09:57:33,553 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2019-01-20 09:57:33,570 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-01-20 09:57:33,636 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_compound_exp_cong.epf [2019-01-20 09:57:33,657 INFO L110 SettingsManager]: Loading preferences was successful [2019-01-20 09:57:33,657 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2019-01-20 09:57:33,658 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2019-01-20 09:57:33,658 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2019-01-20 09:57:33,659 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-01-20 09:57:33,659 INFO L133 SettingsManager]: * User list type=DISABLED [2019-01-20 09:57:33,659 INFO L133 SettingsManager]: * Inline calls to unimplemented procedures=true [2019-01-20 09:57:33,659 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-01-20 09:57:33,659 INFO L133 SettingsManager]: * Explicit value domain=true [2019-01-20 09:57:33,660 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-01-20 09:57:33,660 INFO L133 SettingsManager]: * Octagon Domain=false [2019-01-20 09:57:33,660 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2019-01-20 09:57:33,661 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-01-20 09:57:33,661 INFO L133 SettingsManager]: * Interval Domain=false [2019-01-20 09:57:33,662 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-01-20 09:57:33,663 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2019-01-20 09:57:33,663 INFO L133 SettingsManager]: * Use SBE=true [2019-01-20 09:57:33,663 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-01-20 09:57:33,663 INFO L133 SettingsManager]: * sizeof long=4 [2019-01-20 09:57:33,664 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2019-01-20 09:57:33,664 INFO L133 SettingsManager]: * sizeof POINTER=4 [2019-01-20 09:57:33,664 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2019-01-20 09:57:33,664 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-01-20 09:57:33,664 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-01-20 09:57:33,664 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-01-20 09:57:33,666 INFO L133 SettingsManager]: * sizeof long double=12 [2019-01-20 09:57:33,667 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2019-01-20 09:57:33,667 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-01-20 09:57:33,667 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-01-20 09:57:33,667 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-01-20 09:57:33,667 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2019-01-20 09:57:33,668 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-01-20 09:57:33,668 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-01-20 09:57:33,668 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-01-20 09:57:33,668 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-01-20 09:57:33,668 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-01-20 09:57:33,669 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-01-20 09:57:33,669 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-01-20 09:57:33,669 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-01-20 09:57:33,669 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-01-20 09:57:33,722 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-01-20 09:57:33,746 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-01-20 09:57:33,751 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-01-20 09:57:33,752 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2019-01-20 09:57:33,753 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2019-01-20 09:57:33,754 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/LargeConstant-ForwardSuccess.bpl [2019-01-20 09:57:33,754 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/LargeConstant-ForwardSuccess.bpl' [2019-01-20 09:57:33,794 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-01-20 09:57:33,796 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-01-20 09:57:33,796 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-01-20 09:57:33,797 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-01-20 09:57:33,797 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2019-01-20 09:57:33,815 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "LargeConstant-ForwardSuccess.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:33" (1/1) ... [2019-01-20 09:57:33,826 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "LargeConstant-ForwardSuccess.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:33" (1/1) ... [2019-01-20 09:57:33,834 WARN L165 Inliner]: Program contained no entry procedure! [2019-01-20 09:57:33,834 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2019-01-20 09:57:33,834 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2019-01-20 09:57:33,837 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-01-20 09:57:33,838 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-01-20 09:57:33,838 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-01-20 09:57:33,838 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2019-01-20 09:57:33,850 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "LargeConstant-ForwardSuccess.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:33" (1/1) ... [2019-01-20 09:57:33,850 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "LargeConstant-ForwardSuccess.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:33" (1/1) ... [2019-01-20 09:57:33,852 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "LargeConstant-ForwardSuccess.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:33" (1/1) ... [2019-01-20 09:57:33,853 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "LargeConstant-ForwardSuccess.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:33" (1/1) ... [2019-01-20 09:57:33,859 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "LargeConstant-ForwardSuccess.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:33" (1/1) ... [2019-01-20 09:57:33,863 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "LargeConstant-ForwardSuccess.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:33" (1/1) ... [2019-01-20 09:57:33,864 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "LargeConstant-ForwardSuccess.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:33" (1/1) ... [2019-01-20 09:57:33,865 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-01-20 09:57:33,866 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-01-20 09:57:33,866 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-01-20 09:57:33,866 INFO L276 PluginConnector]: RCFGBuilder initialized [2019-01-20 09:57:33,868 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "LargeConstant-ForwardSuccess.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:33" (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:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-01-20 09:57:33,936 INFO L130 BoogieDeclarations]: Found specification of procedure proc [2019-01-20 09:57:33,937 INFO L138 BoogieDeclarations]: Found implementation of procedure proc [2019-01-20 09:57:34,085 INFO L278 CfgBuilder]: Using library mode [2019-01-20 09:57:34,085 INFO L286 CfgBuilder]: Removed 1 assue(true) statements. [2019-01-20 09:57:34,086 INFO L202 PluginConnector]: Adding new model LargeConstant-ForwardSuccess.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 09:57:34 BoogieIcfgContainer [2019-01-20 09:57:34,086 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-01-20 09:57:34,088 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-01-20 09:57:34,088 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-01-20 09:57:34,095 INFO L276 PluginConnector]: TraceAbstraction initialized [2019-01-20 09:57:34,095 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "LargeConstant-ForwardSuccess.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 20.01 09:57:33" (1/2) ... [2019-01-20 09:57:34,097 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7438533 and model type LargeConstant-ForwardSuccess.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 09:57:34, skipping insertion in model container [2019-01-20 09:57:34,097 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "LargeConstant-ForwardSuccess.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 09:57:34" (2/2) ... [2019-01-20 09:57:34,099 INFO L112 eAbstractionObserver]: Analyzing ICFG LargeConstant-ForwardSuccess.bpl [2019-01-20 09:57:34,109 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-01-20 09:57:34,118 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-01-20 09:57:34,136 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-01-20 09:57:34,172 INFO L382 AbstractCegarLoop]: Interprodecural is true [2019-01-20 09:57:34,173 INFO L383 AbstractCegarLoop]: Hoare is true [2019-01-20 09:57:34,173 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-01-20 09:57:34,173 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-01-20 09:57:34,173 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-01-20 09:57:34,173 INFO L387 AbstractCegarLoop]: Difference is false [2019-01-20 09:57:34,173 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-01-20 09:57:34,173 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-01-20 09:57:34,191 INFO L276 IsEmpty]: Start isEmpty. Operand 4 states. [2019-01-20 09:57:34,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2019-01-20 09:57:34,202 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:34,203 INFO L402 BasicCegarLoop]: trace histogram [1, 1] [2019-01-20 09:57:34,207 INFO L423 AbstractCegarLoop]: === Iteration 1 === [procErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:34,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:34,214 INFO L82 PathProgramCache]: Analyzing trace with hash 965, now seen corresponding path program 1 times [2019-01-20 09:57:34,217 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:34,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:34,268 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:34,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:34,268 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:34,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:34,345 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-20 09:57:34,347 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-01-20 09:57:34,348 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2019-01-20 09:57:34,348 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-01-20 09:57:34,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-01-20 09:57:34,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-01-20 09:57:34,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-01-20 09:57:34,366 INFO L87 Difference]: Start difference. First operand 4 states. Second operand 3 states. [2019-01-20 09:57:34,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:34,409 INFO L93 Difference]: Finished difference Result 7 states and 7 transitions. [2019-01-20 09:57:34,412 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-01-20 09:57:34,413 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 2 [2019-01-20 09:57:34,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:34,432 INFO L225 Difference]: With dead ends: 7 [2019-01-20 09:57:34,432 INFO L226 Difference]: Without dead ends: 4 [2019-01-20 09:57:34,438 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 [2019-01-20 09:57:34,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4 states. [2019-01-20 09:57:34,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4 to 4. [2019-01-20 09:57:34,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2019-01-20 09:57:34,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 4 transitions. [2019-01-20 09:57:34,477 INFO L78 Accepts]: Start accepts. Automaton has 4 states and 4 transitions. Word has length 2 [2019-01-20 09:57:34,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:34,477 INFO L480 AbstractCegarLoop]: Abstraction has 4 states and 4 transitions. [2019-01-20 09:57:34,478 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-01-20 09:57:34,478 INFO L276 IsEmpty]: Start isEmpty. Operand 4 states and 4 transitions. [2019-01-20 09:57:34,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2019-01-20 09:57:34,478 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:34,479 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2019-01-20 09:57:34,479 INFO L423 AbstractCegarLoop]: === Iteration 2 === [procErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:34,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:34,480 INFO L82 PathProgramCache]: Analyzing trace with hash 29950, now seen corresponding path program 1 times [2019-01-20 09:57:34,480 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:34,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:34,482 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:34,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:34,483 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:34,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:34,626 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-20 09:57:34,627 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:34,627 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:34,629 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 4 with the following transitions: [2019-01-20 09:57:34,631 INFO L207 CegarAbsIntRunner]: [0], [4], [5] [2019-01-20 09:57:34,717 INFO L148 AbstractInterpreter]: Using domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2019-01-20 09:57:34,717 INFO L101 FixpointEngine]: Starting fixpoint engine with domain CompoundDomain (maxUnwinding=3, maxParallelStates=2) [2019-01-20 09:57:34,826 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-01-20 09:57:34,830 INFO L272 AbstractInterpreter]: Visited 3 different actions 9 times. Merged at 1 different actions 3 times. Never widened. Performed 95 root evaluator evaluations with a maximum evaluation depth of 2. Performed 95 inverse root evaluator evaluations with a maximum inverse evaluation depth of 2. Found 2 fixpoints after 2 different actions. Largest state had 0 variables. [2019-01-20 09:57:34,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:34,844 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-01-20 09:57:34,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:34,845 INFO 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 [2019-01-20 09:57:34,862 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:34,862 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:57:34,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:34,881 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:34,892 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-20 09:57:34,893 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:35,144 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-20 09:57:35,176 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:35,176 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 4 [2019-01-20 09:57:35,177 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:35,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-01-20 09:57:35,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-01-20 09:57:35,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-01-20 09:57:35,179 INFO L87 Difference]: Start difference. First operand 4 states and 4 transitions. Second operand 4 states. [2019-01-20 09:57:35,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:35,214 INFO L93 Difference]: Finished difference Result 6 states and 6 transitions. [2019-01-20 09:57:35,215 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-01-20 09:57:35,215 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 3 [2019-01-20 09:57:35,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:35,229 INFO L225 Difference]: With dead ends: 6 [2019-01-20 09:57:35,229 INFO L226 Difference]: Without dead ends: 5 [2019-01-20 09:57:35,231 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-01-20 09:57:35,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5 states. [2019-01-20 09:57:35,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5 to 5. [2019-01-20 09:57:35,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2019-01-20 09:57:35,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 5 transitions. [2019-01-20 09:57:35,234 INFO L78 Accepts]: Start accepts. Automaton has 5 states and 5 transitions. Word has length 3 [2019-01-20 09:57:35,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:35,234 INFO L480 AbstractCegarLoop]: Abstraction has 5 states and 5 transitions. [2019-01-20 09:57:35,234 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-01-20 09:57:35,234 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 5 transitions. [2019-01-20 09:57:35,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2019-01-20 09:57:35,235 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:35,235 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1] [2019-01-20 09:57:35,235 INFO L423 AbstractCegarLoop]: === Iteration 3 === [procErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:35,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:35,236 INFO L82 PathProgramCache]: Analyzing trace with hash 928485, now seen corresponding path program 2 times [2019-01-20 09:57:35,236 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:35,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:35,237 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:35,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:35,237 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:35,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:35,340 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-20 09:57:35,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:35,340 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:35,341 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:35,341 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:35,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:35,341 INFO 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 [2019-01-20 09:57:35,352 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:57:35,353 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:57:35,369 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-01-20 09:57:35,369 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:35,370 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:35,374 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-20 09:57:35,374 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:35,464 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-20 09:57:35,482 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:35,483 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2019-01-20 09:57:35,483 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:35,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-01-20 09:57:35,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-01-20 09:57:35,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-01-20 09:57:35,484 INFO L87 Difference]: Start difference. First operand 5 states and 5 transitions. Second operand 5 states. [2019-01-20 09:57:35,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:35,504 INFO L93 Difference]: Finished difference Result 7 states and 7 transitions. [2019-01-20 09:57:35,505 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-01-20 09:57:35,505 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 4 [2019-01-20 09:57:35,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:35,505 INFO L225 Difference]: With dead ends: 7 [2019-01-20 09:57:35,505 INFO L226 Difference]: Without dead ends: 6 [2019-01-20 09:57:35,506 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-01-20 09:57:35,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2019-01-20 09:57:35,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2019-01-20 09:57:35,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2019-01-20 09:57:35,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2019-01-20 09:57:35,510 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2019-01-20 09:57:35,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:35,510 INFO L480 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2019-01-20 09:57:35,511 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-01-20 09:57:35,511 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2019-01-20 09:57:35,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2019-01-20 09:57:35,511 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:35,512 INFO L402 BasicCegarLoop]: trace histogram [3, 1, 1] [2019-01-20 09:57:35,512 INFO L423 AbstractCegarLoop]: === Iteration 4 === [procErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:35,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:35,513 INFO L82 PathProgramCache]: Analyzing trace with hash 28783070, now seen corresponding path program 3 times [2019-01-20 09:57:35,513 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:35,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:35,514 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:35,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:35,514 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:35,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:35,654 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-20 09:57:35,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:35,654 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:35,655 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:35,655 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:35,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:35,655 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 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 [2019-01-20 09:57:35,664 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-01-20 09:57:35,665 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-01-20 09:57:35,692 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-01-20 09:57:35,692 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:35,694 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:35,698 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-20 09:57:35,699 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:35,934 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-20 09:57:35,954 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:35,955 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2019-01-20 09:57:35,955 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:35,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-01-20 09:57:35,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-01-20 09:57:35,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-01-20 09:57:35,956 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 6 states. [2019-01-20 09:57:36,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:36,035 INFO L93 Difference]: Finished difference Result 8 states and 8 transitions. [2019-01-20 09:57:36,035 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-01-20 09:57:36,036 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 5 [2019-01-20 09:57:36,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:36,036 INFO L225 Difference]: With dead ends: 8 [2019-01-20 09:57:36,037 INFO L226 Difference]: Without dead ends: 7 [2019-01-20 09:57:36,038 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-01-20 09:57:36,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2019-01-20 09:57:36,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2019-01-20 09:57:36,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2019-01-20 09:57:36,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2019-01-20 09:57:36,041 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 5 [2019-01-20 09:57:36,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:36,042 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2019-01-20 09:57:36,042 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-01-20 09:57:36,042 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2019-01-20 09:57:36,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-01-20 09:57:36,043 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:36,043 INFO L402 BasicCegarLoop]: trace histogram [4, 1, 1] [2019-01-20 09:57:36,044 INFO L423 AbstractCegarLoop]: === Iteration 5 === [procErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:36,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:36,044 INFO L82 PathProgramCache]: Analyzing trace with hash 892275205, now seen corresponding path program 4 times [2019-01-20 09:57:36,044 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:36,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:36,045 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-01-20 09:57:36,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:36,045 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:36,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:36,141 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-20 09:57:36,141 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:36,141 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:36,142 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:36,142 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:36,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:36,142 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-01-20 09:57:36,150 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:36,151 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-01-20 09:57:36,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:36,162 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:36,169 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-20 09:57:36,169 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:36,354 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-20 09:57:36,373 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:36,373 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2019-01-20 09:57:36,374 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:36,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-01-20 09:57:36,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-01-20 09:57:36,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2019-01-20 09:57:36,375 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 7 states. [2019-01-20 09:57:36,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:36,397 INFO L93 Difference]: Finished difference Result 9 states and 9 transitions. [2019-01-20 09:57:36,399 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-01-20 09:57:36,399 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 6 [2019-01-20 09:57:36,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:36,400 INFO L225 Difference]: With dead ends: 9 [2019-01-20 09:57:36,400 INFO L226 Difference]: Without dead ends: 8 [2019-01-20 09:57:36,401 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2019-01-20 09:57:36,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2019-01-20 09:57:36,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2019-01-20 09:57:36,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2019-01-20 09:57:36,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2019-01-20 09:57:36,404 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2019-01-20 09:57:36,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:36,404 INFO L480 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2019-01-20 09:57:36,404 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-01-20 09:57:36,404 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2019-01-20 09:57:36,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2019-01-20 09:57:36,405 INFO L394 BasicCegarLoop]: Found error trace [2019-01-20 09:57:36,405 INFO L402 BasicCegarLoop]: trace histogram [5, 1, 1] [2019-01-20 09:57:36,405 INFO L423 AbstractCegarLoop]: === Iteration 6 === [procErr0ASSERT_VIOLATIONASSERT]=== [2019-01-20 09:57:36,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-20 09:57:36,406 INFO L82 PathProgramCache]: Analyzing trace with hash 1890727614, now seen corresponding path program 5 times [2019-01-20 09:57:36,406 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-20 09:57:36,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:36,407 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-20 09:57:36,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-20 09:57:36,407 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-20 09:57:36,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-20 09:57:36,532 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-20 09:57:36,533 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:36,533 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-20 09:57:36,533 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-01-20 09:57:36,533 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-01-20 09:57:36,534 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-20 09:57:36,534 INFO 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 [2019-01-20 09:57:36,542 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-01-20 09:57:36,543 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-01-20 09:57:36,549 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-01-20 09:57:36,550 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-01-20 09:57:36,551 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-01-20 09:57:36,635 INFO L683 Elim1Store]: detected equality via solver [2019-01-20 09:57:36,644 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2019-01-20 09:57:36,646 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-01-20 09:57:36,744 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-01-20 09:57:36,745 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:19, output treesize:3 [2019-01-20 09:57:36,905 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-01-20 09:57:36,906 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-01-20 09:57:36,948 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-01-20 09:57:36,968 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-01-20 09:57:36,968 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 3, 3] total 11 [2019-01-20 09:57:36,968 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-01-20 09:57:36,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-01-20 09:57:36,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-01-20 09:57:36,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2019-01-20 09:57:36,970 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 10 states. [2019-01-20 09:57:37,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-20 09:57:37,197 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2019-01-20 09:57:37,198 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-01-20 09:57:37,198 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 7 [2019-01-20 09:57:37,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-20 09:57:37,199 INFO L225 Difference]: With dead ends: 9 [2019-01-20 09:57:37,199 INFO L226 Difference]: Without dead ends: 0 [2019-01-20 09:57:37,200 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=116, Invalid=190, Unknown=0, NotChecked=0, Total=306 [2019-01-20 09:57:37,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-01-20 09:57:37,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-01-20 09:57:37,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-01-20 09:57:37,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-01-20 09:57:37,201 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 7 [2019-01-20 09:57:37,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-20 09:57:37,201 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-01-20 09:57:37,201 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-01-20 09:57:37,201 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-01-20 09:57:37,202 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-01-20 09:57:37,205 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2019-01-20 09:57:37,388 WARN L181 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 17 [2019-01-20 09:57:37,391 INFO L444 ceAbstractionStarter]: At program point L17-1(lines 12 25) the Hoare annotation is: (or (and (< 4 proc_j) (< proc_j 6) (<= proc_i 999) (<= (select proc_a 5) 1000)) (<= proc_i 0)) [2019-01-20 09:57:37,391 INFO L448 ceAbstractionStarter]: For program point procEXIT(lines 12 25) no Hoare annotation was computed. [2019-01-20 09:57:37,391 INFO L448 ceAbstractionStarter]: For program point procENTRY(lines 12 25) no Hoare annotation was computed. [2019-01-20 09:57:37,391 INFO L448 ceAbstractionStarter]: For program point procErr0ASSERT_VIOLATIONASSERT(line 18) no Hoare annotation was computed. [2019-01-20 09:57:37,401 INFO L202 PluginConnector]: Adding new model LargeConstant-ForwardSuccess.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.01 09:57:37 BoogieIcfgContainer [2019-01-20 09:57:37,401 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-01-20 09:57:37,402 INFO L168 Benchmark]: Toolchain (without parser) took 3607.36 ms. Allocated memory was 138.4 MB in the beginning and 178.3 MB in the end (delta: 39.8 MB). Free memory was 105.9 MB in the beginning and 53.9 MB in the end (delta: 52.1 MB). Peak memory consumption was 91.9 MB. Max. memory is 7.1 GB. [2019-01-20 09:57:37,403 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.19 ms. Allocated memory is still 138.4 MB. Free memory is still 107.2 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-01-20 09:57:37,404 INFO L168 Benchmark]: Boogie Procedure Inliner took 41.30 ms. Allocated memory is still 138.4 MB. Free memory was 105.9 MB in the beginning and 104.0 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 7.1 GB. [2019-01-20 09:57:37,405 INFO L168 Benchmark]: Boogie Preprocessor took 27.14 ms. Allocated memory is still 138.4 MB. Free memory was 104.0 MB in the beginning and 103.0 MB in the end (delta: 933.6 kB). Peak memory consumption was 933.6 kB. Max. memory is 7.1 GB. [2019-01-20 09:57:37,406 INFO L168 Benchmark]: RCFGBuilder took 221.03 ms. Allocated memory is still 138.4 MB. Free memory was 102.8 MB in the beginning and 94.6 MB in the end (delta: 8.3 MB). Peak memory consumption was 8.3 MB. Max. memory is 7.1 GB. [2019-01-20 09:57:37,407 INFO L168 Benchmark]: TraceAbstraction took 3313.64 ms. Allocated memory was 138.4 MB in the beginning and 178.3 MB in the end (delta: 39.8 MB). Free memory was 94.3 MB in the beginning and 53.9 MB in the end (delta: 40.5 MB). Peak memory consumption was 80.3 MB. Max. memory is 7.1 GB. [2019-01-20 09:57:37,412 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.19 ms. Allocated memory is still 138.4 MB. Free memory is still 107.2 MB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 41.30 ms. Allocated memory is still 138.4 MB. Free memory was 105.9 MB in the beginning and 104.0 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 27.14 ms. Allocated memory is still 138.4 MB. Free memory was 104.0 MB in the beginning and 103.0 MB in the end (delta: 933.6 kB). Peak memory consumption was 933.6 kB. Max. memory is 7.1 GB. * RCFGBuilder took 221.03 ms. Allocated memory is still 138.4 MB. Free memory was 102.8 MB in the beginning and 94.6 MB in the end (delta: 8.3 MB). Peak memory consumption was 8.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3313.64 ms. Allocated memory was 138.4 MB in the beginning and 178.3 MB in the end (delta: 39.8 MB). Free memory was 94.3 MB in the beginning and 53.9 MB in the end (delta: 40.5 MB). Peak memory consumption was 80.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 18]: 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: (((4 < j && j < 6) && i <= 999) && a[5] <= 1000) || i <= 0 - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 4 locations, 1 error locations. SAFE Result, 3.2s OverallTime, 6 OverallIterations, 5 TraceHistogramMax, 0.4s AutomataDifference, 0.0s DeadEndRemovalTime, 0.1s HoareAnnotationTime, HoareTripleCheckerStatistics: 12 SDtfs, 1 SDslu, 2 SDs, 0 SdLazy, 38 SolverSat, 8 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 67 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=8occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 1 LocationsWithAnnotation, 1 PreInvPairs, 7 NumberOfFragments, 19 HoareAnnotationTreeSize, 1 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 1 FomulaSimplificationsInter, 75 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.8s InterpolantComputationTime, 52 NumberOfCodeBlocks, 49 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 61 ConstructedInterpolants, 0 QuantifiedInterpolants, 1053 SizeOfPredicates, 5 NumberOfNonLiveVariables, 121 ConjunctsInSsa, 24 ConjunctsInUnsatCore, 16 InterpolantComputations, 1 PerfectInterpolantSequences, 22/105 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...