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/ArrayInit02.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-e1a14da [2018-12-24 13:47:08,525 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-24 13:47:08,529 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-24 13:47:08,549 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2018-12-24 13:47:08,590 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 [2018-12-24 13:47:08,608 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-24 13:47:08,611 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-24 13:47:08,612 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-24 13:47:08,612 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-24 13:47:08,612 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-24 13:47:08,612 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-24 13:47:08,612 INFO L133 SettingsManager]: * Inline calls to unimplemented procedures=true [2018-12-24 13:47:08,613 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-24 13:47:08,613 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-24 13:47:08,613 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-24 13:47:08,613 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-24 13:47:08,613 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-12-24 13:47:08,613 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-24 13:47:08,614 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-24 13:47:08,615 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-24 13:47:08,615 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-24 13:47:08,615 INFO L133 SettingsManager]: * Use SBE=true [2018-12-24 13:47:08,617 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-24 13:47:08,617 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-24 13:47:08,618 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-24 13:47:08,618 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-24 13:47:08,618 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-24 13:47:08,618 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-24 13:47:08,618 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-24 13:47:08,619 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-24 13:47:08,619 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-24 13:47:08,619 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-24 13:47:08,620 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-24 13:47:08,620 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-24 13:47:08,620 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-24 13:47:08,620 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-24 13:47:08,620 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-24 13:47:08,621 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-24 13:47:08,621 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-24 13:47:08,621 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-24 13:47:08,622 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-24 13:47:08,622 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-24 13:47:08,622 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-24 13:47:08,622 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-24 13:47:08,622 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-24 13:47:08,679 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-24 13:47:08,693 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-24 13:47:08,698 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-24 13:47:08,700 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-24 13:47:08,700 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-24 13:47:08,701 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/ArrayInit02.bpl [2018-12-24 13:47:08,701 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/ArrayInit02.bpl' [2018-12-24 13:47:08,747 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-24 13:47:08,750 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-24 13:47:08,750 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-24 13:47:08,751 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-24 13:47:08,751 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-24 13:47:08,769 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 01:47:08" (1/1) ... [2018-12-24 13:47:08,786 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 01:47:08" (1/1) ... [2018-12-24 13:47:08,795 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-24 13:47:08,796 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-24 13:47:08,796 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-24 13:47:08,797 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-24 13:47:08,810 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 01:47:08" (1/1) ... [2018-12-24 13:47:08,811 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 01:47:08" (1/1) ... [2018-12-24 13:47:08,811 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 01:47:08" (1/1) ... [2018-12-24 13:47:08,812 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 01:47:08" (1/1) ... [2018-12-24 13:47:08,818 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 01:47:08" (1/1) ... [2018-12-24 13:47:08,825 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 01:47:08" (1/1) ... [2018-12-24 13:47:08,826 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 01:47:08" (1/1) ... [2018-12-24 13:47:08,828 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-24 13:47:08,829 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-24 13:47:08,829 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-24 13:47:08,829 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-24 13:47:08,830 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 01:47:08" (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 [2018-12-24 13:47:08,915 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2018-12-24 13:47:08,915 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-24 13:47:08,915 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-24 13:47:09,188 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-24 13:47:09,188 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-24 13:47:09,189 INFO L202 PluginConnector]: Adding new model ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.12 01:47:09 BoogieIcfgContainer [2018-12-24 13:47:09,189 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-24 13:47:09,190 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-24 13:47:09,190 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-24 13:47:09,194 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-24 13:47:09,194 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.12 01:47:08" (1/2) ... [2018-12-24 13:47:09,195 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@524bb654 and model type ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.12 01:47:09, skipping insertion in model container [2018-12-24 13:47:09,196 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.12 01:47:09" (2/2) ... [2018-12-24 13:47:09,197 INFO L112 eAbstractionObserver]: Analyzing ICFG ArrayInit02.bpl [2018-12-24 13:47:09,208 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-24 13:47:09,217 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-24 13:47:09,238 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-24 13:47:09,281 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-24 13:47:09,281 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-24 13:47:09,281 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-24 13:47:09,281 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-24 13:47:09,282 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-24 13:47:09,282 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-24 13:47:09,282 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-24 13:47:09,282 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-24 13:47:09,304 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2018-12-24 13:47:09,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-24 13:47:09,314 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:09,315 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-12-24 13:47:09,318 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:09,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:09,330 INFO L82 PathProgramCache]: Analyzing trace with hash 900035954, now seen corresponding path program 1 times [2018-12-24 13:47:09,333 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:09,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:09,393 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:09,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:09,393 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:09,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:09,664 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:09,668 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-24 13:47:09,668 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-24 13:47:09,668 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-24 13:47:09,673 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-24 13:47:09,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-24 13:47:09,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-24 13:47:09,690 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 4 states. [2018-12-24 13:47:09,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:09,887 INFO L93 Difference]: Finished difference Result 26 states and 34 transitions. [2018-12-24 13:47:09,887 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-24 13:47:09,889 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-12-24 13:47:09,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:09,900 INFO L225 Difference]: With dead ends: 26 [2018-12-24 13:47:09,901 INFO L226 Difference]: Without dead ends: 13 [2018-12-24 13:47:09,904 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-12-24 13:47:09,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-24 13:47:09,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2018-12-24 13:47:09,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-12-24 13:47:09,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 14 transitions. [2018-12-24 13:47:09,941 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 14 transitions. Word has length 6 [2018-12-24 13:47:09,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:09,943 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 14 transitions. [2018-12-24 13:47:09,943 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-24 13:47:09,943 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 14 transitions. [2018-12-24 13:47:09,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-24 13:47:09,944 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:09,944 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-24 13:47:09,944 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:09,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:09,946 INFO L82 PathProgramCache]: Analyzing trace with hash 429804648, now seen corresponding path program 1 times [2018-12-24 13:47:09,946 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:09,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:09,949 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:09,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:09,949 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:09,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:10,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:10,048 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-24 13:47:10,048 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-12-24 13:47:10,048 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-24 13:47:10,050 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-24 13:47:10,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-24 13:47:10,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-24 13:47:10,051 INFO L87 Difference]: Start difference. First operand 11 states and 14 transitions. Second operand 4 states. [2018-12-24 13:47:10,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:10,158 INFO L93 Difference]: Finished difference Result 25 states and 31 transitions. [2018-12-24 13:47:10,158 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-24 13:47:10,158 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2018-12-24 13:47:10,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:10,160 INFO L225 Difference]: With dead ends: 25 [2018-12-24 13:47:10,160 INFO L226 Difference]: Without dead ends: 23 [2018-12-24 13:47:10,161 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-12-24 13:47:10,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-12-24 13:47:10,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 19. [2018-12-24 13:47:10,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-24 13:47:10,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 26 transitions. [2018-12-24 13:47:10,167 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 26 transitions. Word has length 9 [2018-12-24 13:47:10,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:10,167 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 26 transitions. [2018-12-24 13:47:10,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-24 13:47:10,168 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 26 transitions. [2018-12-24 13:47:10,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-24 13:47:10,169 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:10,169 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-24 13:47:10,169 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:10,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:10,170 INFO L82 PathProgramCache]: Analyzing trace with hash 429806570, now seen corresponding path program 1 times [2018-12-24 13:47:10,170 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:10,171 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:10,171 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:10,171 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:10,171 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:10,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:10,223 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-24 13:47:10,223 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-24 13:47:10,224 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-24 13:47:10,224 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-24 13:47:10,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-24 13:47:10,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-24 13:47:10,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-24 13:47:10,226 INFO L87 Difference]: Start difference. First operand 19 states and 26 transitions. Second operand 3 states. [2018-12-24 13:47:10,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:10,258 INFO L93 Difference]: Finished difference Result 24 states and 31 transitions. [2018-12-24 13:47:10,258 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-24 13:47:10,259 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2018-12-24 13:47:10,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:10,260 INFO L225 Difference]: With dead ends: 24 [2018-12-24 13:47:10,260 INFO L226 Difference]: Without dead ends: 13 [2018-12-24 13:47:10,261 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-24 13:47:10,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-24 13:47:10,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2018-12-24 13:47:10,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-12-24 13:47:10,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2018-12-24 13:47:10,265 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2018-12-24 13:47:10,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:10,265 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2018-12-24 13:47:10,266 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-24 13:47:10,266 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2018-12-24 13:47:10,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-24 13:47:10,266 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:10,266 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-24 13:47:10,267 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:10,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:10,267 INFO L82 PathProgramCache]: Analyzing trace with hash -2090155286, now seen corresponding path program 1 times [2018-12-24 13:47:10,267 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:10,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:10,268 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:10,274 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:10,274 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:10,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:10,617 WARN L181 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 15 [2018-12-24 13:47:10,691 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:10,692 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:10,692 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:10,693 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 10 with the following transitions: [2018-12-24 13:47:10,696 INFO L207 CegarAbsIntRunner]: [0], [4], [9], [11], [13], [17], [20], [26], [27] [2018-12-24 13:47:10,736 INFO L148 AbstractInterpreter]: Using domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-24 13:47:10,737 INFO L101 FixpointEngine]: Starting fixpoint engine with domain CompoundDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-24 13:47:10,875 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-24 13:47:10,876 INFO L272 AbstractInterpreter]: Visited 9 different actions 29 times. Merged at 8 different actions 18 times. Widened at 1 different actions 1 times. Performed 110 root evaluator evaluations with a maximum evaluation depth of 3. Performed 110 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 3 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-24 13:47:10,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:10,884 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-24 13:47:10,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:10,884 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 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-24 13:47:10,904 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:10,904 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:47:10,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:10,942 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:11,247 WARN L181 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2018-12-24 13:47:11,250 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:11,251 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:11,307 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:11,327 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:11,328 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 6 [2018-12-24 13:47:11,328 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:11,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-24 13:47:11,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-24 13:47:11,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-12-24 13:47:11,329 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 7 states. [2018-12-24 13:47:11,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:11,581 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2018-12-24 13:47:11,584 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-24 13:47:11,584 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2018-12-24 13:47:11,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:11,585 INFO L225 Difference]: With dead ends: 26 [2018-12-24 13:47:11,585 INFO L226 Difference]: Without dead ends: 19 [2018-12-24 13:47:11,586 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2018-12-24 13:47:11,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-24 13:47:11,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 14. [2018-12-24 13:47:11,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-12-24 13:47:11,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2018-12-24 13:47:11,593 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 9 [2018-12-24 13:47:11,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:11,593 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2018-12-24 13:47:11,594 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-24 13:47:11,594 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2018-12-24 13:47:11,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-24 13:47:11,594 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:11,595 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-24 13:47:11,595 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:11,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:11,595 INFO L82 PathProgramCache]: Analyzing trace with hash -368470767, now seen corresponding path program 1 times [2018-12-24 13:47:11,595 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:11,596 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:11,597 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:11,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:11,597 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:11,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:11,745 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:11,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:11,745 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:11,745 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-24 13:47:11,746 INFO L207 CegarAbsIntRunner]: [0], [4], [9], [11], [13], [17], [20], [22], [26], [27], [30], [32] [2018-12-24 13:47:11,748 INFO L148 AbstractInterpreter]: Using domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-24 13:47:11,748 INFO L101 FixpointEngine]: Starting fixpoint engine with domain CompoundDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-24 13:47:11,788 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-24 13:47:11,788 INFO L272 AbstractInterpreter]: Visited 12 different actions 41 times. Merged at 11 different actions 22 times. Widened at 1 different actions 1 times. Performed 147 root evaluator evaluations with a maximum evaluation depth of 4. Performed 147 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 10 fixpoints after 7 different actions. Largest state had 0 variables. [2018-12-24 13:47:11,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:11,789 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-24 13:47:11,789 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:11,789 INFO 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 [2018-12-24 13:47:11,807 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:11,807 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:47:11,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:11,816 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:11,916 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:11,916 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:11,946 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:11,970 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:11,970 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 7 [2018-12-24 13:47:11,970 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:11,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-24 13:47:11,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-24 13:47:11,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2018-12-24 13:47:11,972 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 8 states. [2018-12-24 13:47:12,314 WARN L181 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-12-24 13:47:12,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:12,380 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2018-12-24 13:47:12,381 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-24 13:47:12,381 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 13 [2018-12-24 13:47:12,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:12,382 INFO L225 Difference]: With dead ends: 31 [2018-12-24 13:47:12,383 INFO L226 Difference]: Without dead ends: 19 [2018-12-24 13:47:12,384 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2018-12-24 13:47:12,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-24 13:47:12,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2018-12-24 13:47:12,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-12-24 13:47:12,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2018-12-24 13:47:12,389 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2018-12-24 13:47:12,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:12,389 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2018-12-24 13:47:12,389 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-24 13:47:12,389 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2018-12-24 13:47:12,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-24 13:47:12,390 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:12,390 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-24 13:47:12,390 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:12,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:12,391 INFO L82 PathProgramCache]: Analyzing trace with hash -256855911, now seen corresponding path program 2 times [2018-12-24 13:47:12,391 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:12,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:12,392 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:12,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:12,392 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:12,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:12,688 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:12,689 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:12,689 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:12,690 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:12,690 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:12,690 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:12,690 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-24 13:47:12,711 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:47:12,711 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:47:12,719 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-24 13:47:12,720 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:47:12,724 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:12,845 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:12,845 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:12,884 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:12,904 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:12,905 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 10 [2018-12-24 13:47:12,905 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:12,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-24 13:47:12,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-24 13:47:12,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2018-12-24 13:47:12,906 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 11 states. [2018-12-24 13:47:13,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:13,180 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2018-12-24 13:47:13,182 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-24 13:47:13,182 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-24 13:47:13,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:13,184 INFO L225 Difference]: With dead ends: 35 [2018-12-24 13:47:13,191 INFO L226 Difference]: Without dead ends: 28 [2018-12-24 13:47:13,191 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 25 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2018-12-24 13:47:13,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-24 13:47:13,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 21. [2018-12-24 13:47:13,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-24 13:47:13,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2018-12-24 13:47:13,198 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 16 [2018-12-24 13:47:13,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:13,199 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2018-12-24 13:47:13,199 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-24 13:47:13,199 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2018-12-24 13:47:13,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-24 13:47:13,200 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:13,200 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2018-12-24 13:47:13,200 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:13,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:13,202 INFO L82 PathProgramCache]: Analyzing trace with hash 1110643520, now seen corresponding path program 3 times [2018-12-24 13:47:13,202 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:13,203 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:13,203 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:47:13,203 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:13,203 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:13,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:13,336 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:13,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:13,337 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:13,337 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:13,338 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:13,338 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:13,338 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-12-24 13:47:13,348 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:47:13,348 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:47:13,354 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:47:13,354 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:47:13,357 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:13,415 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:13,416 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:13,466 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:13,485 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:13,486 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 10 [2018-12-24 13:47:13,486 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:13,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-24 13:47:13,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-24 13:47:13,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2018-12-24 13:47:13,487 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 11 states. [2018-12-24 13:47:13,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:13,595 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2018-12-24 13:47:13,596 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-24 13:47:13,596 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-12-24 13:47:13,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:13,597 INFO L225 Difference]: With dead ends: 45 [2018-12-24 13:47:13,597 INFO L226 Difference]: Without dead ends: 26 [2018-12-24 13:47:13,598 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 31 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2018-12-24 13:47:13,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-12-24 13:47:13,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2018-12-24 13:47:13,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-24 13:47:13,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2018-12-24 13:47:13,603 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 20 [2018-12-24 13:47:13,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:13,604 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2018-12-24 13:47:13,604 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-24 13:47:13,604 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2018-12-24 13:47:13,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-24 13:47:13,605 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:13,605 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1] [2018-12-24 13:47:13,605 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:13,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:13,606 INFO L82 PathProgramCache]: Analyzing trace with hash -1324912968, now seen corresponding path program 4 times [2018-12-24 13:47:13,606 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:13,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:13,607 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:47:13,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:13,607 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:13,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:13,829 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:13,829 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:13,829 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:13,829 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:13,830 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:13,830 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:13,830 INFO 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 [2018-12-24 13:47:13,839 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:13,839 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:47:13,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:13,849 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:14,087 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:14,088 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:14,119 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:14,138 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:14,139 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 13 [2018-12-24 13:47:14,139 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:14,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-24 13:47:14,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-24 13:47:14,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2018-12-24 13:47:14,140 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 14 states. [2018-12-24 13:47:14,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:14,634 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2018-12-24 13:47:14,639 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-24 13:47:14,639 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 23 [2018-12-24 13:47:14,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:14,640 INFO L225 Difference]: With dead ends: 49 [2018-12-24 13:47:14,640 INFO L226 Difference]: Without dead ends: 39 [2018-12-24 13:47:14,641 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=71, Invalid=309, Unknown=0, NotChecked=0, Total=380 [2018-12-24 13:47:14,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-24 13:47:14,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 28. [2018-12-24 13:47:14,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-12-24 13:47:14,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2018-12-24 13:47:14,646 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2018-12-24 13:47:14,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:14,647 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2018-12-24 13:47:14,647 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-24 13:47:14,647 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2018-12-24 13:47:14,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-24 13:47:14,648 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:14,648 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2018-12-24 13:47:14,648 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:14,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:14,649 INFO L82 PathProgramCache]: Analyzing trace with hash 1588570591, now seen corresponding path program 5 times [2018-12-24 13:47:14,649 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:14,650 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:14,650 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:14,650 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:14,650 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:14,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:14,832 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:14,832 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:14,832 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:14,833 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:14,833 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:14,833 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:14,833 INFO 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 [2018-12-24 13:47:14,842 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:47:14,842 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:47:14,851 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-24 13:47:14,851 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:47:14,853 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:14,923 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:14,923 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:14,969 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:14,996 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:14,997 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 13 [2018-12-24 13:47:14,997 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:14,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-24 13:47:14,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-24 13:47:14,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2018-12-24 13:47:14,998 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 14 states. [2018-12-24 13:47:15,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:15,264 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2018-12-24 13:47:15,264 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-24 13:47:15,264 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 27 [2018-12-24 13:47:15,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:15,265 INFO L225 Difference]: With dead ends: 60 [2018-12-24 13:47:15,265 INFO L226 Difference]: Without dead ends: 33 [2018-12-24 13:47:15,267 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 7 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=215, Unknown=0, NotChecked=0, Total=306 [2018-12-24 13:47:15,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-24 13:47:15,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2018-12-24 13:47:15,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-24 13:47:15,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2018-12-24 13:47:15,272 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 27 [2018-12-24 13:47:15,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:15,273 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2018-12-24 13:47:15,273 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-24 13:47:15,273 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2018-12-24 13:47:15,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-24 13:47:15,274 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:15,274 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1] [2018-12-24 13:47:15,274 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:15,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:15,275 INFO L82 PathProgramCache]: Analyzing trace with hash 366737255, now seen corresponding path program 6 times [2018-12-24 13:47:15,275 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:15,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:15,276 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:47:15,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:15,276 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:15,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:15,521 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 3 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:15,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:15,522 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:15,522 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:15,522 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:15,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:15,522 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-24 13:47:15,533 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:47:15,533 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:47:15,550 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:47:15,550 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:47:15,552 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:15,688 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 3 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:15,688 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:15,736 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 3 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:15,756 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:15,756 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 16 [2018-12-24 13:47:15,756 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:15,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-24 13:47:15,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-24 13:47:15,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2018-12-24 13:47:15,758 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 17 states. [2018-12-24 13:47:16,597 WARN L181 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-12-24 13:47:16,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:16,835 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2018-12-24 13:47:16,842 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-24 13:47:16,842 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 30 [2018-12-24 13:47:16,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:16,843 INFO L225 Difference]: With dead ends: 64 [2018-12-24 13:47:16,843 INFO L226 Difference]: Without dead ends: 50 [2018-12-24 13:47:16,844 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=95, Invalid=505, Unknown=0, NotChecked=0, Total=600 [2018-12-24 13:47:16,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-12-24 13:47:16,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 35. [2018-12-24 13:47:16,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-12-24 13:47:16,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2018-12-24 13:47:16,855 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 30 [2018-12-24 13:47:16,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:16,855 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2018-12-24 13:47:16,855 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-24 13:47:16,855 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2018-12-24 13:47:16,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-12-24 13:47:16,856 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:16,856 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2018-12-24 13:47:16,857 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:16,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:16,857 INFO L82 PathProgramCache]: Analyzing trace with hash -1079885042, now seen corresponding path program 7 times [2018-12-24 13:47:16,857 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:16,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:16,858 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:47:16,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:16,859 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:16,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:17,284 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 36 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:17,284 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:17,284 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:17,284 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:17,285 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:17,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:17,285 INFO 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 [2018-12-24 13:47:17,294 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:17,295 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:47:17,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:17,306 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:17,396 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 36 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:17,396 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:17,453 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 36 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:17,472 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:17,472 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 16 [2018-12-24 13:47:17,472 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:17,472 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-24 13:47:17,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-24 13:47:17,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2018-12-24 13:47:17,473 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 17 states. [2018-12-24 13:47:17,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:17,784 INFO L93 Difference]: Finished difference Result 75 states and 79 transitions. [2018-12-24 13:47:17,785 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-24 13:47:17,785 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 34 [2018-12-24 13:47:17,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:17,786 INFO L225 Difference]: With dead ends: 75 [2018-12-24 13:47:17,786 INFO L226 Difference]: Without dead ends: 40 [2018-12-24 13:47:17,787 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 53 SyntacticMatches, 9 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2018-12-24 13:47:17,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-12-24 13:47:17,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2018-12-24 13:47:17,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-12-24 13:47:17,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-12-24 13:47:17,794 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 34 [2018-12-24 13:47:17,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:17,794 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-12-24 13:47:17,794 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-24 13:47:17,794 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-12-24 13:47:17,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-12-24 13:47:17,795 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:17,796 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1] [2018-12-24 13:47:17,796 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:17,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:17,796 INFO L82 PathProgramCache]: Analyzing trace with hash -921359226, now seen corresponding path program 8 times [2018-12-24 13:47:17,797 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:17,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:17,798 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:17,798 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:17,798 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:17,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:18,117 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 4 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:18,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:18,117 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:18,117 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:18,117 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:18,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:18,117 INFO 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 [2018-12-24 13:47:18,126 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:47:18,126 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:47:18,138 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-24 13:47:18,138 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:47:18,142 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:18,686 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 32 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:18,687 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:19,433 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 28 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:19,451 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:19,452 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 14] total 33 [2018-12-24 13:47:19,452 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:19,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-24 13:47:19,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-24 13:47:19,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=961, Unknown=0, NotChecked=0, Total=1122 [2018-12-24 13:47:19,454 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 27 states. [2018-12-24 13:47:21,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:21,822 INFO L93 Difference]: Finished difference Result 97 states and 103 transitions. [2018-12-24 13:47:21,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-24 13:47:21,823 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 37 [2018-12-24 13:47:21,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:21,824 INFO L225 Difference]: With dead ends: 97 [2018-12-24 13:47:21,824 INFO L226 Difference]: Without dead ends: 58 [2018-12-24 13:47:21,826 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 47 SyntacticMatches, 6 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 855 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=499, Invalid=3533, Unknown=0, NotChecked=0, Total=4032 [2018-12-24 13:47:21,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-12-24 13:47:21,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 45. [2018-12-24 13:47:21,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-24 13:47:21,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2018-12-24 13:47:21,834 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 37 [2018-12-24 13:47:21,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:21,834 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2018-12-24 13:47:21,834 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-24 13:47:21,834 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2018-12-24 13:47:21,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-24 13:47:21,835 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:21,835 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1] [2018-12-24 13:47:21,836 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:21,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:21,836 INFO L82 PathProgramCache]: Analyzing trace with hash -1868574667, now seen corresponding path program 9 times [2018-12-24 13:47:21,836 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:21,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:21,837 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:47:21,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:21,837 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:21,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:22,277 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 5 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:22,277 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:22,277 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:22,278 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:22,278 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:22,278 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:22,278 INFO 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 [2018-12-24 13:47:22,287 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:47:22,287 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:47:22,297 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:47:22,297 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:47:22,299 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:22,595 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 5 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:22,596 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:22,628 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 5 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:22,646 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:22,647 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 22 [2018-12-24 13:47:22,647 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:22,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-24 13:47:22,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-24 13:47:22,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=448, Unknown=0, NotChecked=0, Total=506 [2018-12-24 13:47:22,648 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 23 states. [2018-12-24 13:47:23,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:23,956 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2018-12-24 13:47:23,956 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-24 13:47:23,957 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 44 [2018-12-24 13:47:23,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:23,958 INFO L225 Difference]: With dead ends: 94 [2018-12-24 13:47:23,958 INFO L226 Difference]: Without dead ends: 72 [2018-12-24 13:47:23,960 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=149, Invalid=1041, Unknown=0, NotChecked=0, Total=1190 [2018-12-24 13:47:23,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-12-24 13:47:23,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 49. [2018-12-24 13:47:23,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-24 13:47:23,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2018-12-24 13:47:23,968 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 44 [2018-12-24 13:47:23,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:23,969 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2018-12-24 13:47:23,969 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-24 13:47:23,969 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2018-12-24 13:47:23,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-24 13:47:23,970 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:23,970 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1] [2018-12-24 13:47:23,970 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:23,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:23,971 INFO L82 PathProgramCache]: Analyzing trace with hash 269550812, now seen corresponding path program 10 times [2018-12-24 13:47:23,971 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:23,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:23,972 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:47:23,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:23,972 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:23,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:24,109 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:24,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:24,110 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:24,110 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:24,110 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:24,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:24,111 INFO 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 [2018-12-24 13:47:24,122 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:24,122 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:47:24,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:24,156 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:24,378 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:24,378 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:24,478 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:24,499 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:24,499 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 22 [2018-12-24 13:47:24,499 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:24,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-24 13:47:24,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-24 13:47:24,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-12-24 13:47:24,500 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand 23 states. [2018-12-24 13:47:24,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:24,901 INFO L93 Difference]: Finished difference Result 105 states and 109 transitions. [2018-12-24 13:47:24,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-24 13:47:24,901 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 48 [2018-12-24 13:47:24,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:24,902 INFO L225 Difference]: With dead ends: 105 [2018-12-24 13:47:24,902 INFO L226 Difference]: Without dead ends: 54 [2018-12-24 13:47:24,903 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 75 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=232, Invalid=638, Unknown=0, NotChecked=0, Total=870 [2018-12-24 13:47:24,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-12-24 13:47:24,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2018-12-24 13:47:24,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-12-24 13:47:24,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2018-12-24 13:47:24,912 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 48 [2018-12-24 13:47:24,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:24,912 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2018-12-24 13:47:24,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-24 13:47:24,912 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2018-12-24 13:47:24,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-12-24 13:47:24,913 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:24,913 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1] [2018-12-24 13:47:24,913 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:24,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:24,914 INFO L82 PathProgramCache]: Analyzing trace with hash 2089942100, now seen corresponding path program 11 times [2018-12-24 13:47:24,914 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:24,915 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:24,915 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:24,915 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:24,915 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:24,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:25,229 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 6 proven. 142 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:25,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:25,230 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:25,230 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:25,230 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:25,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:25,230 INFO 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 [2018-12-24 13:47:25,240 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:47:25,240 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:47:25,292 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-12-24 13:47:25,293 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:47:25,296 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:25,570 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 6 proven. 142 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:25,570 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:25,608 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 6 proven. 142 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:25,626 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:25,627 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 25 [2018-12-24 13:47:25,627 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:25,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-24 13:47:25,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-24 13:47:25,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=584, Unknown=0, NotChecked=0, Total=650 [2018-12-24 13:47:25,628 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 26 states. [2018-12-24 13:47:26,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:26,770 INFO L93 Difference]: Finished difference Result 109 states and 114 transitions. [2018-12-24 13:47:26,776 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-24 13:47:26,776 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 51 [2018-12-24 13:47:26,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:26,777 INFO L225 Difference]: With dead ends: 109 [2018-12-24 13:47:26,777 INFO L226 Difference]: Without dead ends: 83 [2018-12-24 13:47:26,778 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=179, Invalid=1381, Unknown=0, NotChecked=0, Total=1560 [2018-12-24 13:47:26,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-12-24 13:47:26,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 56. [2018-12-24 13:47:26,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-12-24 13:47:26,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2018-12-24 13:47:26,793 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 51 [2018-12-24 13:47:26,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:26,793 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2018-12-24 13:47:26,793 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-24 13:47:26,794 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2018-12-24 13:47:26,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-12-24 13:47:26,795 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:26,795 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1] [2018-12-24 13:47:26,795 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:26,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:26,795 INFO L82 PathProgramCache]: Analyzing trace with hash 549587323, now seen corresponding path program 12 times [2018-12-24 13:47:26,796 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:26,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:26,797 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:47:26,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:26,797 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:26,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:27,057 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 105 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:27,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:27,058 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:27,058 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:27,058 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:27,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:27,058 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-12-24 13:47:27,068 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:47:27,068 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:47:27,077 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:47:27,078 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:47:27,081 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:27,275 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 105 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:27,275 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:27,420 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 105 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:27,440 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:27,440 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 25 [2018-12-24 13:47:27,440 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:27,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-24 13:47:27,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-24 13:47:27,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2018-12-24 13:47:27,441 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 26 states. [2018-12-24 13:47:27,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:27,805 INFO L93 Difference]: Finished difference Result 120 states and 124 transitions. [2018-12-24 13:47:27,806 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-24 13:47:27,806 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 55 [2018-12-24 13:47:27,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:27,807 INFO L225 Difference]: With dead ends: 120 [2018-12-24 13:47:27,807 INFO L226 Difference]: Without dead ends: 61 [2018-12-24 13:47:27,808 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 86 SyntacticMatches, 15 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=293, Invalid=829, Unknown=0, NotChecked=0, Total=1122 [2018-12-24 13:47:27,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-24 13:47:27,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2018-12-24 13:47:27,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-12-24 13:47:27,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2018-12-24 13:47:27,817 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 55 [2018-12-24 13:47:27,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:27,817 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2018-12-24 13:47:27,817 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-24 13:47:27,818 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2018-12-24 13:47:27,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-12-24 13:47:27,818 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:27,819 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1] [2018-12-24 13:47:27,819 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:27,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:27,819 INFO L82 PathProgramCache]: Analyzing trace with hash -1743111421, now seen corresponding path program 13 times [2018-12-24 13:47:27,819 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:27,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:27,820 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:47:27,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:27,820 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:27,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:28,390 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 7 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:28,390 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:28,390 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:28,390 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:28,391 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:28,391 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:28,391 INFO 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 [2018-12-24 13:47:28,400 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:28,400 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:47:28,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:28,414 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:28,653 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 7 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:28,653 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:28,729 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 7 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:28,748 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:28,748 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 28 [2018-12-24 13:47:28,748 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:28,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-24 13:47:28,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-24 13:47:28,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=738, Unknown=0, NotChecked=0, Total=812 [2018-12-24 13:47:28,750 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 29 states. [2018-12-24 13:47:30,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:30,383 INFO L93 Difference]: Finished difference Result 124 states and 129 transitions. [2018-12-24 13:47:30,385 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-24 13:47:30,385 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 58 [2018-12-24 13:47:30,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:30,387 INFO L225 Difference]: With dead ends: 124 [2018-12-24 13:47:30,387 INFO L226 Difference]: Without dead ends: 94 [2018-12-24 13:47:30,388 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 103 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=211, Invalid=1769, Unknown=0, NotChecked=0, Total=1980 [2018-12-24 13:47:30,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-12-24 13:47:30,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 63. [2018-12-24 13:47:30,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-24 13:47:30,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2018-12-24 13:47:30,398 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 58 [2018-12-24 13:47:30,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:30,399 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2018-12-24 13:47:30,399 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-24 13:47:30,399 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2018-12-24 13:47:30,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-24 13:47:30,400 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:30,400 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1] [2018-12-24 13:47:30,400 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:30,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:30,401 INFO L82 PathProgramCache]: Analyzing trace with hash -1415751510, now seen corresponding path program 14 times [2018-12-24 13:47:30,401 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:30,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:30,402 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:30,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:30,402 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:30,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:30,617 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 136 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:30,618 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:30,618 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:30,618 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:30,618 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:30,618 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:30,618 INFO 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 [2018-12-24 13:47:30,626 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:47:30,626 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:47:30,642 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-24 13:47:30,642 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:47:30,644 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:30,853 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 136 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:30,853 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:31,010 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 136 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:31,028 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:31,028 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 28 [2018-12-24 13:47:31,028 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:31,029 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-24 13:47:31,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-24 13:47:31,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=604, Unknown=0, NotChecked=0, Total=812 [2018-12-24 13:47:31,029 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand 29 states. [2018-12-24 13:47:31,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:31,471 INFO L93 Difference]: Finished difference Result 135 states and 139 transitions. [2018-12-24 13:47:31,471 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-24 13:47:31,471 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2018-12-24 13:47:31,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:31,472 INFO L225 Difference]: With dead ends: 135 [2018-12-24 13:47:31,472 INFO L226 Difference]: Without dead ends: 68 [2018-12-24 13:47:31,474 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 97 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=361, Invalid=1045, Unknown=0, NotChecked=0, Total=1406 [2018-12-24 13:47:31,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-12-24 13:47:31,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2018-12-24 13:47:31,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-12-24 13:47:31,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2018-12-24 13:47:31,484 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 62 [2018-12-24 13:47:31,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:31,484 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2018-12-24 13:47:31,484 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-24 13:47:31,484 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2018-12-24 13:47:31,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-12-24 13:47:31,485 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:31,486 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1] [2018-12-24 13:47:31,486 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:31,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:31,486 INFO L82 PathProgramCache]: Analyzing trace with hash 175889954, now seen corresponding path program 15 times [2018-12-24 13:47:31,486 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:31,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:31,487 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:47:31,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:31,487 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:31,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:31,940 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 8 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:31,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:31,940 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:31,940 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:31,940 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:31,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:31,941 INFO 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 [2018-12-24 13:47:31,949 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:47:31,949 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:47:31,960 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:47:31,961 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:47:31,963 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:32,280 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 8 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:32,281 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:32,343 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 8 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:32,361 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:32,361 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 31 [2018-12-24 13:47:32,361 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:32,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-24 13:47:32,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-24 13:47:32,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=910, Unknown=0, NotChecked=0, Total=992 [2018-12-24 13:47:32,363 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 32 states. [2018-12-24 13:47:34,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:34,224 INFO L93 Difference]: Finished difference Result 139 states and 144 transitions. [2018-12-24 13:47:34,224 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-24 13:47:34,224 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 65 [2018-12-24 13:47:34,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:34,225 INFO L225 Difference]: With dead ends: 139 [2018-12-24 13:47:34,226 INFO L226 Difference]: Without dead ends: 105 [2018-12-24 13:47:34,227 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 116 SyntacticMatches, 3 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 388 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=245, Invalid=2205, Unknown=0, NotChecked=0, Total=2450 [2018-12-24 13:47:34,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-12-24 13:47:34,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 70. [2018-12-24 13:47:34,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-12-24 13:47:34,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2018-12-24 13:47:34,236 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 65 [2018-12-24 13:47:34,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:34,236 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2018-12-24 13:47:34,236 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-24 13:47:34,236 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2018-12-24 13:47:34,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-12-24 13:47:34,237 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:34,237 INFO L402 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1] [2018-12-24 13:47:34,238 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:34,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:34,238 INFO L82 PathProgramCache]: Analyzing trace with hash 2774089, now seen corresponding path program 16 times [2018-12-24 13:47:34,238 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:34,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:34,239 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:47:34,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:34,239 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:34,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:34,513 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 171 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:34,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:34,513 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:34,514 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:34,514 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:34,514 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:34,514 INFO 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 [2018-12-24 13:47:34,524 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:34,524 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:47:34,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:34,539 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:35,108 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 171 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:35,108 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:35,418 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 171 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:35,437 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:35,437 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 31 [2018-12-24 13:47:35,437 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:35,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-24 13:47:35,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-24 13:47:35,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2018-12-24 13:47:35,439 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 32 states. [2018-12-24 13:47:35,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:35,819 INFO L93 Difference]: Finished difference Result 150 states and 154 transitions. [2018-12-24 13:47:35,822 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-24 13:47:35,822 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 69 [2018-12-24 13:47:35,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:35,822 INFO L225 Difference]: With dead ends: 150 [2018-12-24 13:47:35,822 INFO L226 Difference]: Without dead ends: 75 [2018-12-24 13:47:35,823 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 108 SyntacticMatches, 19 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=436, Invalid=1286, Unknown=0, NotChecked=0, Total=1722 [2018-12-24 13:47:35,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-12-24 13:47:35,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2018-12-24 13:47:35,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-12-24 13:47:35,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2018-12-24 13:47:35,833 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 69 [2018-12-24 13:47:35,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:35,833 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2018-12-24 13:47:35,833 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-24 13:47:35,833 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2018-12-24 13:47:35,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-24 13:47:35,834 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:35,834 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 1, 1, 1, 1, 1] [2018-12-24 13:47:35,835 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:35,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:35,835 INFO L82 PathProgramCache]: Analyzing trace with hash 2036938705, now seen corresponding path program 17 times [2018-12-24 13:47:35,835 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:35,836 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:35,836 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:35,836 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:35,836 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:35,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:36,445 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 9 proven. 307 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:36,445 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:36,445 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:36,446 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:36,446 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:36,446 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:36,446 INFO 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 [2018-12-24 13:47:36,455 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:47:36,455 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:47:36,474 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-12-24 13:47:36,474 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:47:36,476 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:37,374 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 162 proven. 154 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:37,375 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:38,115 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 153 proven. 163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:38,134 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:38,135 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24, 24] total 58 [2018-12-24 13:47:38,135 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:38,135 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-24 13:47:38,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-24 13:47:38,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=421, Invalid=3001, Unknown=0, NotChecked=0, Total=3422 [2018-12-24 13:47:38,136 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand 47 states. [2018-12-24 13:47:40,747 WARN L181 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2018-12-24 13:47:42,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:42,698 INFO L93 Difference]: Finished difference Result 192 states and 198 transitions. [2018-12-24 13:47:42,698 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-24 13:47:42,699 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 72 [2018-12-24 13:47:42,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:42,700 INFO L225 Difference]: With dead ends: 192 [2018-12-24 13:47:42,700 INFO L226 Difference]: Without dead ends: 113 [2018-12-24 13:47:42,704 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 97 SyntacticMatches, 11 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3015 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=1319, Invalid=12723, Unknown=0, NotChecked=0, Total=14042 [2018-12-24 13:47:42,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2018-12-24 13:47:42,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 80. [2018-12-24 13:47:42,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-12-24 13:47:42,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2018-12-24 13:47:42,714 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 72 [2018-12-24 13:47:42,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:42,714 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2018-12-24 13:47:42,714 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-24 13:47:42,714 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2018-12-24 13:47:42,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-12-24 13:47:42,715 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:42,715 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1] [2018-12-24 13:47:42,715 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:42,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:42,715 INFO L82 PathProgramCache]: Analyzing trace with hash 1070649840, now seen corresponding path program 18 times [2018-12-24 13:47:42,715 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:42,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:42,716 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:47:42,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:42,716 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:42,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:43,811 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 10 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:43,811 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:43,811 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:43,811 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:43,812 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:43,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:43,812 INFO 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 [2018-12-24 13:47:43,821 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:47:43,821 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:47:43,836 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:47:43,836 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:47:43,838 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:44,254 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 10 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:44,254 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:44,313 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 10 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:44,333 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:44,333 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 37 [2018-12-24 13:47:44,333 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:44,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-24 13:47:44,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-24 13:47:44,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1308, Unknown=0, NotChecked=0, Total=1406 [2018-12-24 13:47:44,334 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 38 states. [2018-12-24 13:47:46,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:46,674 INFO L93 Difference]: Finished difference Result 169 states and 174 transitions. [2018-12-24 13:47:46,676 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-24 13:47:46,676 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 79 [2018-12-24 13:47:46,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:46,677 INFO L225 Difference]: With dead ends: 169 [2018-12-24 13:47:46,677 INFO L226 Difference]: Without dead ends: 127 [2018-12-24 13:47:46,679 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 142 SyntacticMatches, 3 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=319, Invalid=3221, Unknown=0, NotChecked=0, Total=3540 [2018-12-24 13:47:46,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-12-24 13:47:46,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 84. [2018-12-24 13:47:46,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-12-24 13:47:46,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2018-12-24 13:47:46,688 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 79 [2018-12-24 13:47:46,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:46,689 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2018-12-24 13:47:46,689 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-24 13:47:46,689 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2018-12-24 13:47:46,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-12-24 13:47:46,690 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:46,690 INFO L402 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1] [2018-12-24 13:47:46,690 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:46,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:46,690 INFO L82 PathProgramCache]: Analyzing trace with hash -685461225, now seen corresponding path program 19 times [2018-12-24 13:47:46,690 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:46,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:46,691 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:47:46,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:46,692 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:46,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:47,034 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 253 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:47,034 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:47,034 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:47,034 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:47,034 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:47,034 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:47,034 INFO 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 [2018-12-24 13:47:47,045 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:47,045 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:47:47,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:47,063 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:47,339 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 253 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:47,339 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:47,535 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 253 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:47,554 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:47,555 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 37 [2018-12-24 13:47:47,555 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:47,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-24 13:47:47,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-24 13:47:47,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2018-12-24 13:47:47,556 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2018-12-24 13:47:48,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:48,077 INFO L93 Difference]: Finished difference Result 180 states and 184 transitions. [2018-12-24 13:47:48,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-24 13:47:48,077 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2018-12-24 13:47:48,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:48,078 INFO L225 Difference]: With dead ends: 180 [2018-12-24 13:47:48,079 INFO L226 Difference]: Without dead ends: 89 [2018-12-24 13:47:48,081 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 130 SyntacticMatches, 23 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 770 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=607, Invalid=1843, Unknown=0, NotChecked=0, Total=2450 [2018-12-24 13:47:48,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-12-24 13:47:48,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2018-12-24 13:47:48,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-24 13:47:48,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2018-12-24 13:47:48,092 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 83 [2018-12-24 13:47:48,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:48,092 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2018-12-24 13:47:48,092 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-24 13:47:48,092 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2018-12-24 13:47:48,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-24 13:47:48,093 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:48,093 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 1, 1, 1, 1, 1] [2018-12-24 13:47:48,093 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:48,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:48,094 INFO L82 PathProgramCache]: Analyzing trace with hash -1750415713, now seen corresponding path program 20 times [2018-12-24 13:47:48,094 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:48,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:48,095 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:47:48,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:48,095 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:48,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:48,684 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 11 proven. 452 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:48,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:48,685 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:48,685 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:48,685 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:48,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:48,685 INFO 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 [2018-12-24 13:47:48,695 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:47:48,695 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:47:48,717 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-12-24 13:47:48,717 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:47:48,720 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:49,873 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 242 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:49,873 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:51,198 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 231 proven. 232 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:51,218 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:51,219 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 28, 28] total 68 [2018-12-24 13:47:51,219 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:51,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-24 13:47:51,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-24 13:47:51,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=560, Invalid=4132, Unknown=0, NotChecked=0, Total=4692 [2018-12-24 13:47:51,221 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand 55 states. [2018-12-24 13:47:57,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:47:57,354 INFO L93 Difference]: Finished difference Result 230 states and 236 transitions. [2018-12-24 13:47:57,354 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2018-12-24 13:47:57,355 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 86 [2018-12-24 13:47:57,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:47:57,356 INFO L225 Difference]: With dead ends: 230 [2018-12-24 13:47:57,356 INFO L226 Difference]: Without dead ends: 135 [2018-12-24 13:47:57,362 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 117 SyntacticMatches, 13 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4250 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=1745, Invalid=17995, Unknown=0, NotChecked=0, Total=19740 [2018-12-24 13:47:57,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-12-24 13:47:57,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 94. [2018-12-24 13:47:57,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-12-24 13:47:57,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2018-12-24 13:47:57,375 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 86 [2018-12-24 13:47:57,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:47:57,375 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2018-12-24 13:47:57,376 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-24 13:47:57,376 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2018-12-24 13:47:57,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-12-24 13:47:57,376 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:47:57,376 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1] [2018-12-24 13:47:57,376 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:47:57,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:47:57,377 INFO L82 PathProgramCache]: Analyzing trace with hash 2005850046, now seen corresponding path program 21 times [2018-12-24 13:47:57,377 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:47:57,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:57,378 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:47:57,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:47:57,378 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:47:57,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:47:58,024 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 12 proven. 535 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:58,025 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:58,025 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:47:58,025 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:47:58,025 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:47:58,025 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:47:58,025 INFO 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 [2018-12-24 13:47:58,045 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:47:58,045 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:47:58,061 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:47:58,061 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:47:58,063 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:47:58,569 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 12 proven. 535 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:58,569 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:47:58,638 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 12 proven. 535 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:47:58,656 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:47:58,656 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 43 [2018-12-24 13:47:58,656 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:47:58,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-24 13:47:58,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-24 13:47:58,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1778, Unknown=0, NotChecked=0, Total=1892 [2018-12-24 13:47:58,658 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand 44 states. [2018-12-24 13:48:01,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:48:01,980 INFO L93 Difference]: Finished difference Result 199 states and 204 transitions. [2018-12-24 13:48:01,980 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-24 13:48:01,980 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 93 [2018-12-24 13:48:01,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:48:01,982 INFO L225 Difference]: With dead ends: 199 [2018-12-24 13:48:01,982 INFO L226 Difference]: Without dead ends: 149 [2018-12-24 13:48:01,983 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 168 SyntacticMatches, 3 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 764 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=401, Invalid=4429, Unknown=0, NotChecked=0, Total=4830 [2018-12-24 13:48:01,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-12-24 13:48:01,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 98. [2018-12-24 13:48:01,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-12-24 13:48:01,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 100 transitions. [2018-12-24 13:48:01,997 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 100 transitions. Word has length 93 [2018-12-24 13:48:01,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:48:01,997 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 100 transitions. [2018-12-24 13:48:01,997 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-24 13:48:01,997 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 100 transitions. [2018-12-24 13:48:01,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-12-24 13:48:01,998 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:48:01,998 INFO L402 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1] [2018-12-24 13:48:01,998 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:48:01,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:48:01,998 INFO L82 PathProgramCache]: Analyzing trace with hash 1370431461, now seen corresponding path program 22 times [2018-12-24 13:48:01,999 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:48:01,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:01,999 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:48:01,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:01,999 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:48:02,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:48:02,608 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 351 proven. 247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:02,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:02,608 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:48:02,608 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:48:02,609 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:48:02,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:02,609 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-12-24 13:48:02,617 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:48:02,617 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:48:02,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:48:02,637 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:48:03,006 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 351 proven. 247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:03,006 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:48:04,430 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 351 proven. 247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:04,448 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:48:04,448 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 43 [2018-12-24 13:48:04,448 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:48:04,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-24 13:48:04,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-24 13:48:04,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2018-12-24 13:48:04,449 INFO L87 Difference]: Start difference. First operand 98 states and 100 transitions. Second operand 44 states. [2018-12-24 13:48:05,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:48:05,108 INFO L93 Difference]: Finished difference Result 210 states and 214 transitions. [2018-12-24 13:48:05,108 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-12-24 13:48:05,109 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 97 [2018-12-24 13:48:05,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:48:05,109 INFO L225 Difference]: With dead ends: 210 [2018-12-24 13:48:05,109 INFO L226 Difference]: Without dead ends: 103 [2018-12-24 13:48:05,110 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 152 SyntacticMatches, 27 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1066 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=806, Invalid=2500, Unknown=0, NotChecked=0, Total=3306 [2018-12-24 13:48:05,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-12-24 13:48:05,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 101. [2018-12-24 13:48:05,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-12-24 13:48:05,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2018-12-24 13:48:05,126 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2018-12-24 13:48:05,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:48:05,126 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2018-12-24 13:48:05,126 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-24 13:48:05,126 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2018-12-24 13:48:05,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-12-24 13:48:05,126 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:48:05,127 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 1, 1, 1, 1, 1] [2018-12-24 13:48:05,127 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:48:05,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:48:05,127 INFO L82 PathProgramCache]: Analyzing trace with hash 1811736429, now seen corresponding path program 23 times [2018-12-24 13:48:05,127 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:48:05,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:05,128 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:48:05,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:05,128 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:48:05,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:48:06,316 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 13 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:06,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:06,317 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:48:06,317 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:48:06,317 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:48:06,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:06,317 INFO 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 [2018-12-24 13:48:06,326 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:48:06,326 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:48:06,353 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-24 13:48:06,353 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:48:06,356 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:48:07,065 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 13 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:07,065 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:48:07,147 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 13 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:07,176 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:48:07,176 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 46 [2018-12-24 13:48:07,176 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:48:07,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-24 13:48:07,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-24 13:48:07,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=2040, Unknown=0, NotChecked=0, Total=2162 [2018-12-24 13:48:07,178 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand 47 states. [2018-12-24 13:48:10,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:48:10,628 INFO L93 Difference]: Finished difference Result 214 states and 219 transitions. [2018-12-24 13:48:10,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-24 13:48:10,628 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 100 [2018-12-24 13:48:10,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:48:10,630 INFO L225 Difference]: With dead ends: 214 [2018-12-24 13:48:10,630 INFO L226 Difference]: Without dead ends: 160 [2018-12-24 13:48:10,631 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 181 SyntacticMatches, 3 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 878 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=445, Invalid=5105, Unknown=0, NotChecked=0, Total=5550 [2018-12-24 13:48:10,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-12-24 13:48:10,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 105. [2018-12-24 13:48:10,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-12-24 13:48:10,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2018-12-24 13:48:10,647 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 100 [2018-12-24 13:48:10,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:48:10,648 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2018-12-24 13:48:10,648 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-24 13:48:10,648 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2018-12-24 13:48:10,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-12-24 13:48:10,648 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:48:10,648 INFO L402 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1] [2018-12-24 13:48:10,648 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:48:10,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:48:10,649 INFO L82 PathProgramCache]: Analyzing trace with hash 1008713748, now seen corresponding path program 24 times [2018-12-24 13:48:10,649 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:48:10,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:10,649 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:48:10,650 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:10,650 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:48:10,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:48:11,322 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 406 proven. 287 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:11,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:11,323 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:48:11,323 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:48:11,323 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:48:11,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:11,323 INFO 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 [2018-12-24 13:48:11,332 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:48:11,332 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:48:11,347 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:48:11,347 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:48:11,349 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:48:11,748 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 406 proven. 287 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:11,748 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:48:12,020 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 406 proven. 287 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:12,039 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:48:12,039 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 46 [2018-12-24 13:48:12,039 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:48:12,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-24 13:48:12,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-24 13:48:12,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1636, Unknown=0, NotChecked=0, Total=2162 [2018-12-24 13:48:12,040 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand 47 states. [2018-12-24 13:48:12,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:48:12,674 INFO L93 Difference]: Finished difference Result 225 states and 229 transitions. [2018-12-24 13:48:12,674 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-12-24 13:48:12,675 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 104 [2018-12-24 13:48:12,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:48:12,676 INFO L225 Difference]: With dead ends: 225 [2018-12-24 13:48:12,676 INFO L226 Difference]: Without dead ends: 110 [2018-12-24 13:48:12,676 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 163 SyntacticMatches, 29 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1232 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=916, Invalid=2866, Unknown=0, NotChecked=0, Total=3782 [2018-12-24 13:48:12,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2018-12-24 13:48:12,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 108. [2018-12-24 13:48:12,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-12-24 13:48:12,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 110 transitions. [2018-12-24 13:48:12,693 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 110 transitions. Word has length 104 [2018-12-24 13:48:12,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:48:12,693 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 110 transitions. [2018-12-24 13:48:12,693 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-24 13:48:12,693 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 110 transitions. [2018-12-24 13:48:12,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-12-24 13:48:12,694 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:48:12,694 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1] [2018-12-24 13:48:12,694 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:48:12,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:48:12,694 INFO L82 PathProgramCache]: Analyzing trace with hash -1699483764, now seen corresponding path program 25 times [2018-12-24 13:48:12,695 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:48:12,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:12,695 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:48:12,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:12,695 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:48:12,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:48:13,413 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 14 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:13,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:13,414 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:48:13,414 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:48:13,414 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:48:13,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:13,414 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-12-24 13:48:13,422 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:48:13,422 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:48:13,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:48:13,445 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:48:14,103 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 14 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:14,104 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:48:14,183 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 14 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:14,202 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:48:14,202 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 49 [2018-12-24 13:48:14,202 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:48:14,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-24 13:48:14,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-24 13:48:14,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=2320, Unknown=0, NotChecked=0, Total=2450 [2018-12-24 13:48:14,203 INFO L87 Difference]: Start difference. First operand 108 states and 110 transitions. Second operand 50 states. [2018-12-24 13:48:19,099 WARN L181 SmtUtils]: Spent 383.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2018-12-24 13:48:19,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:48:19,423 INFO L93 Difference]: Finished difference Result 229 states and 234 transitions. [2018-12-24 13:48:19,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-24 13:48:19,426 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 107 [2018-12-24 13:48:19,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:48:19,426 INFO L225 Difference]: With dead ends: 229 [2018-12-24 13:48:19,427 INFO L226 Difference]: Without dead ends: 171 [2018-12-24 13:48:19,428 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 194 SyntacticMatches, 3 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1000 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=491, Invalid=5829, Unknown=0, NotChecked=0, Total=6320 [2018-12-24 13:48:19,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2018-12-24 13:48:19,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 112. [2018-12-24 13:48:19,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-12-24 13:48:19,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 114 transitions. [2018-12-24 13:48:19,450 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 114 transitions. Word has length 107 [2018-12-24 13:48:19,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:48:19,450 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 114 transitions. [2018-12-24 13:48:19,450 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-24 13:48:19,450 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 114 transitions. [2018-12-24 13:48:19,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-12-24 13:48:19,451 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:48:19,451 INFO L402 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1] [2018-12-24 13:48:19,451 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:48:19,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:48:19,452 INFO L82 PathProgramCache]: Analyzing trace with hash -1446534989, now seen corresponding path program 26 times [2018-12-24 13:48:19,452 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:48:19,452 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:19,452 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:48:19,453 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:19,453 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:48:19,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:48:20,092 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 465 proven. 330 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:20,092 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:20,092 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:48:20,093 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:48:20,093 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:48:20,093 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:20,093 INFO 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 [2018-12-24 13:48:20,103 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:48:20,103 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:48:20,135 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-12-24 13:48:20,135 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:48:20,137 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:48:20,583 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 465 proven. 330 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:20,583 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:48:20,916 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 465 proven. 330 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:20,934 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:48:20,935 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 49 [2018-12-24 13:48:20,935 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:48:20,935 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-24 13:48:20,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-24 13:48:20,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2018-12-24 13:48:20,936 INFO L87 Difference]: Start difference. First operand 112 states and 114 transitions. Second operand 50 states. [2018-12-24 13:48:21,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:48:21,654 INFO L93 Difference]: Finished difference Result 240 states and 244 transitions. [2018-12-24 13:48:21,654 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-12-24 13:48:21,654 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 111 [2018-12-24 13:48:21,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:48:21,656 INFO L225 Difference]: With dead ends: 240 [2018-12-24 13:48:21,656 INFO L226 Difference]: Without dead ends: 117 [2018-12-24 13:48:21,657 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 174 SyntacticMatches, 31 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1410 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1033, Invalid=3257, Unknown=0, NotChecked=0, Total=4290 [2018-12-24 13:48:21,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-12-24 13:48:21,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2018-12-24 13:48:21,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-12-24 13:48:21,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2018-12-24 13:48:21,678 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 111 [2018-12-24 13:48:21,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:48:21,679 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2018-12-24 13:48:21,679 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-24 13:48:21,679 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2018-12-24 13:48:21,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-12-24 13:48:21,680 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:48:21,680 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 15, 1, 1, 1, 1, 1] [2018-12-24 13:48:21,680 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:48:21,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:48:21,680 INFO L82 PathProgramCache]: Analyzing trace with hash -2055366085, now seen corresponding path program 27 times [2018-12-24 13:48:21,681 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:48:21,681 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:21,681 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:48:21,681 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:21,681 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:48:21,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:48:22,506 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 15 proven. 826 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:22,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:22,506 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:48:22,506 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:48:22,506 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:48:22,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:22,506 INFO 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 [2018-12-24 13:48:22,515 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:48:22,515 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:48:22,536 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:48:22,536 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:48:22,539 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:48:23,247 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 15 proven. 826 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:23,247 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:48:23,337 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 15 proven. 826 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:23,355 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:48:23,355 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 52 [2018-12-24 13:48:23,355 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:48:23,356 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-24 13:48:23,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-24 13:48:23,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2618, Unknown=0, NotChecked=0, Total=2756 [2018-12-24 13:48:23,357 INFO L87 Difference]: Start difference. First operand 115 states and 117 transitions. Second operand 53 states. [2018-12-24 13:48:28,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:48:28,600 INFO L93 Difference]: Finished difference Result 244 states and 249 transitions. [2018-12-24 13:48:28,607 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-24 13:48:28,607 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 114 [2018-12-24 13:48:28,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:48:28,608 INFO L225 Difference]: With dead ends: 244 [2018-12-24 13:48:28,608 INFO L226 Difference]: Without dead ends: 182 [2018-12-24 13:48:28,609 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 207 SyntacticMatches, 3 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1130 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=539, Invalid=6601, Unknown=0, NotChecked=0, Total=7140 [2018-12-24 13:48:28,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-12-24 13:48:28,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 119. [2018-12-24 13:48:28,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-12-24 13:48:28,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2018-12-24 13:48:28,632 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 114 [2018-12-24 13:48:28,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:48:28,633 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2018-12-24 13:48:28,633 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-24 13:48:28,633 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2018-12-24 13:48:28,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2018-12-24 13:48:28,634 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:48:28,634 INFO L402 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1] [2018-12-24 13:48:28,634 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:48:28,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:48:28,634 INFO L82 PathProgramCache]: Analyzing trace with hash 1833851874, now seen corresponding path program 28 times [2018-12-24 13:48:28,634 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:48:28,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:28,635 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:48:28,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:28,635 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:48:28,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:48:29,314 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 528 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:29,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:29,315 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:48:29,315 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:48:29,315 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:48:29,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:29,315 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 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 [2018-12-24 13:48:29,326 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:48:29,326 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:48:29,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:48:29,349 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:48:29,870 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 528 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:29,870 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:48:30,225 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 528 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:30,243 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:48:30,244 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 52 [2018-12-24 13:48:30,244 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:48:30,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-24 13:48:30,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-24 13:48:30,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2092, Unknown=0, NotChecked=0, Total=2756 [2018-12-24 13:48:30,245 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand 53 states. [2018-12-24 13:48:31,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:48:31,161 INFO L93 Difference]: Finished difference Result 255 states and 259 transitions. [2018-12-24 13:48:31,161 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-12-24 13:48:31,162 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 118 [2018-12-24 13:48:31,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:48:31,163 INFO L225 Difference]: With dead ends: 255 [2018-12-24 13:48:31,163 INFO L226 Difference]: Without dead ends: 124 [2018-12-24 13:48:31,164 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 185 SyntacticMatches, 33 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1600 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1157, Invalid=3673, Unknown=0, NotChecked=0, Total=4830 [2018-12-24 13:48:31,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-24 13:48:31,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 122. [2018-12-24 13:48:31,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-12-24 13:48:31,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 124 transitions. [2018-12-24 13:48:31,183 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 124 transitions. Word has length 118 [2018-12-24 13:48:31,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:48:31,183 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 124 transitions. [2018-12-24 13:48:31,183 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-24 13:48:31,183 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 124 transitions. [2018-12-24 13:48:31,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-12-24 13:48:31,184 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:48:31,184 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1] [2018-12-24 13:48:31,184 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:48:31,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:48:31,184 INFO L82 PathProgramCache]: Analyzing trace with hash 540940634, now seen corresponding path program 29 times [2018-12-24 13:48:31,185 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:48:31,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:31,185 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:48:31,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:31,185 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:48:31,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:48:32,277 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 16 proven. 937 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:32,278 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:32,278 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:48:32,278 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:48:32,278 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:48:32,278 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:32,278 INFO 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 [2018-12-24 13:48:32,286 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:48:32,286 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:48:32,332 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-24 13:48:32,332 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:48:32,334 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:48:34,360 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 512 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:34,360 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:48:36,133 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 496 proven. 457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:36,152 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:48:36,152 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 38, 38] total 93 [2018-12-24 13:48:36,152 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:48:36,153 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-12-24 13:48:36,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-12-24 13:48:36,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=995, Invalid=7747, Unknown=0, NotChecked=0, Total=8742 [2018-12-24 13:48:36,154 INFO L87 Difference]: Start difference. First operand 122 states and 124 transitions. Second operand 75 states. [2018-12-24 13:48:46,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:48:46,830 INFO L93 Difference]: Finished difference Result 325 states and 331 transitions. [2018-12-24 13:48:46,830 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2018-12-24 13:48:46,830 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 121 [2018-12-24 13:48:46,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:48:46,832 INFO L225 Difference]: With dead ends: 325 [2018-12-24 13:48:46,832 INFO L226 Difference]: Without dead ends: 190 [2018-12-24 13:48:46,834 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 167 SyntacticMatches, 18 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8265 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=3055, Invalid=35165, Unknown=0, NotChecked=0, Total=38220 [2018-12-24 13:48:46,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-12-24 13:48:46,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 129. [2018-12-24 13:48:46,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-12-24 13:48:46,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 131 transitions. [2018-12-24 13:48:46,855 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 131 transitions. Word has length 121 [2018-12-24 13:48:46,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:48:46,855 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 131 transitions. [2018-12-24 13:48:46,855 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-12-24 13:48:46,855 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 131 transitions. [2018-12-24 13:48:46,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-12-24 13:48:46,856 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:48:46,856 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 17, 1, 1, 1, 1, 1] [2018-12-24 13:48:46,856 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:48:46,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:48:46,857 INFO L82 PathProgramCache]: Analyzing trace with hash -1991581943, now seen corresponding path program 30 times [2018-12-24 13:48:46,857 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:48:46,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:46,857 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:48:46,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:46,858 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:48:46,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:48:47,855 INFO L134 CoverageAnalysis]: Checked inductivity of 1072 backedges. 17 proven. 1055 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:47,855 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:47,855 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:48:47,856 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:48:47,856 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:48:47,856 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:47,856 INFO 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 [2018-12-24 13:48:47,864 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:48:47,864 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:48:47,883 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:48:47,883 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:48:47,886 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:48:48,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1072 backedges. 17 proven. 1055 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:48,782 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:48:48,912 INFO L134 CoverageAnalysis]: Checked inductivity of 1072 backedges. 17 proven. 1055 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:48,932 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:48:48,932 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 58 [2018-12-24 13:48:48,932 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:48:48,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-24 13:48:48,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-24 13:48:48,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=3268, Unknown=0, NotChecked=0, Total=3422 [2018-12-24 13:48:48,934 INFO L87 Difference]: Start difference. First operand 129 states and 131 transitions. Second operand 59 states. [2018-12-24 13:48:54,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:48:54,769 INFO L93 Difference]: Finished difference Result 274 states and 279 transitions. [2018-12-24 13:48:54,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-24 13:48:54,770 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 128 [2018-12-24 13:48:54,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:48:54,771 INFO L225 Difference]: With dead ends: 274 [2018-12-24 13:48:54,771 INFO L226 Difference]: Without dead ends: 204 [2018-12-24 13:48:54,772 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 233 SyntacticMatches, 3 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1414 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=641, Invalid=8289, Unknown=0, NotChecked=0, Total=8930 [2018-12-24 13:48:54,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2018-12-24 13:48:54,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 133. [2018-12-24 13:48:54,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-12-24 13:48:54,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2018-12-24 13:48:54,797 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 128 [2018-12-24 13:48:54,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:48:54,797 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2018-12-24 13:48:54,797 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-24 13:48:54,797 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2018-12-24 13:48:54,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-12-24 13:48:54,798 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:48:54,798 INFO L402 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1] [2018-12-24 13:48:54,798 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:48:54,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:48:54,799 INFO L82 PathProgramCache]: Analyzing trace with hash -1942976080, now seen corresponding path program 31 times [2018-12-24 13:48:54,799 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:48:54,799 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:54,799 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:48:54,799 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:54,799 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:48:54,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:48:56,237 INFO L134 CoverageAnalysis]: Checked inductivity of 1143 backedges. 666 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:56,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:56,238 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:48:56,238 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:48:56,238 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:48:56,238 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:56,238 INFO 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 [2018-12-24 13:48:56,255 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:48:56,255 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:48:56,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:48:56,287 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:48:57,042 INFO L134 CoverageAnalysis]: Checked inductivity of 1143 backedges. 666 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:57,043 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:48:57,482 INFO L134 CoverageAnalysis]: Checked inductivity of 1143 backedges. 666 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:57,500 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:48:57,500 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 58 [2018-12-24 13:48:57,500 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:48:57,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-24 13:48:57,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-24 13:48:57,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2604, Unknown=0, NotChecked=0, Total=3422 [2018-12-24 13:48:57,501 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand 59 states. [2018-12-24 13:48:58,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:48:58,376 INFO L93 Difference]: Finished difference Result 285 states and 289 transitions. [2018-12-24 13:48:58,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-12-24 13:48:58,376 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 132 [2018-12-24 13:48:58,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:48:58,378 INFO L225 Difference]: With dead ends: 285 [2018-12-24 13:48:58,378 INFO L226 Difference]: Without dead ends: 138 [2018-12-24 13:48:58,379 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 207 SyntacticMatches, 37 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2016 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1426, Invalid=4580, Unknown=0, NotChecked=0, Total=6006 [2018-12-24 13:48:58,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-12-24 13:48:58,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2018-12-24 13:48:58,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-12-24 13:48:58,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 138 transitions. [2018-12-24 13:48:58,408 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 138 transitions. Word has length 132 [2018-12-24 13:48:58,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:48:58,408 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 138 transitions. [2018-12-24 13:48:58,408 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-24 13:48:58,408 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 138 transitions. [2018-12-24 13:48:58,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-12-24 13:48:58,409 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:48:58,409 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 18, 18, 18, 1, 1, 1, 1, 1] [2018-12-24 13:48:58,409 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:48:58,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:48:58,410 INFO L82 PathProgramCache]: Analyzing trace with hash 220943656, now seen corresponding path program 32 times [2018-12-24 13:48:58,410 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:48:58,410 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:58,410 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:48:58,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:48:58,411 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:48:58,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:48:59,502 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 18 proven. 1180 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:48:59,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:59,502 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:48:59,502 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:48:59,502 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:48:59,503 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:48:59,503 INFO 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 [2018-12-24 13:48:59,512 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:48:59,512 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:48:59,551 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-12-24 13:48:59,552 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:48:59,554 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:49:02,210 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 648 proven. 550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:49:02,211 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:49:04,532 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 630 proven. 568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:49:04,550 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:49:04,550 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 42, 42] total 103 [2018-12-24 13:49:04,550 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:49:04,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-24 13:49:04,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-24 13:49:04,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1204, Invalid=9508, Unknown=0, NotChecked=0, Total=10712 [2018-12-24 13:49:04,552 INFO L87 Difference]: Start difference. First operand 136 states and 138 transitions. Second operand 83 states. [2018-12-24 13:49:16,332 WARN L181 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2018-12-24 13:49:18,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:49:18,558 INFO L93 Difference]: Finished difference Result 363 states and 369 transitions. [2018-12-24 13:49:18,558 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2018-12-24 13:49:18,558 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 135 [2018-12-24 13:49:18,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:49:18,559 INFO L225 Difference]: With dead ends: 363 [2018-12-24 13:49:18,559 INFO L226 Difference]: Without dead ends: 212 [2018-12-24 13:49:18,561 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 187 SyntacticMatches, 20 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10242 ImplicationChecksByTransitivity, 15.9s TimeCoverageRelationStatistics Valid=3677, Invalid=43629, Unknown=0, NotChecked=0, Total=47306 [2018-12-24 13:49:18,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2018-12-24 13:49:18,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 143. [2018-12-24 13:49:18,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2018-12-24 13:49:18,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2018-12-24 13:49:18,586 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 135 [2018-12-24 13:49:18,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:49:18,586 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2018-12-24 13:49:18,586 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-24 13:49:18,586 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2018-12-24 13:49:18,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2018-12-24 13:49:18,587 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:49:18,587 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 1, 1, 1, 1, 1] [2018-12-24 13:49:18,587 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:49:18,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:49:18,587 INFO L82 PathProgramCache]: Analyzing trace with hash 847427031, now seen corresponding path program 33 times [2018-12-24 13:49:18,587 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:49:18,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:49:18,588 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:49:18,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:49:18,588 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:49:18,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:49:19,998 INFO L134 CoverageAnalysis]: Checked inductivity of 1331 backedges. 19 proven. 1312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:49:19,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:49:19,998 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:49:19,998 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:49:19,998 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:49:19,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:49:19,998 INFO 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 [2018-12-24 13:49:20,008 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:49:20,008 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:49:20,042 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:49:20,042 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:49:20,046 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:49:22,342 INFO L134 CoverageAnalysis]: Checked inductivity of 1331 backedges. 19 proven. 1312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:49:22,342 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:49:22,525 INFO L134 CoverageAnalysis]: Checked inductivity of 1331 backedges. 19 proven. 1312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:49:22,543 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:49:22,543 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 64 [2018-12-24 13:49:22,543 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:49:22,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-24 13:49:22,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-24 13:49:22,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3990, Unknown=0, NotChecked=0, Total=4160 [2018-12-24 13:49:22,544 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand 65 states. [2018-12-24 13:49:26,846 WARN L181 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2018-12-24 13:49:27,122 WARN L181 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2018-12-24 13:49:27,375 WARN L181 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2018-12-24 13:49:27,564 WARN L181 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-24 13:49:27,780 WARN L181 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2018-12-24 13:49:29,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:49:29,323 INFO L93 Difference]: Finished difference Result 304 states and 309 transitions. [2018-12-24 13:49:29,323 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-24 13:49:29,323 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 142 [2018-12-24 13:49:29,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:49:29,325 INFO L225 Difference]: With dead ends: 304 [2018-12-24 13:49:29,325 INFO L226 Difference]: Without dead ends: 226 [2018-12-24 13:49:29,326 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 259 SyntacticMatches, 3 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1730 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=751, Invalid=10169, Unknown=0, NotChecked=0, Total=10920 [2018-12-24 13:49:29,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2018-12-24 13:49:29,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 147. [2018-12-24 13:49:29,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-12-24 13:49:29,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 149 transitions. [2018-12-24 13:49:29,352 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 149 transitions. Word has length 142 [2018-12-24 13:49:29,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:49:29,353 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 149 transitions. [2018-12-24 13:49:29,353 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-24 13:49:29,353 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 149 transitions. [2018-12-24 13:49:29,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-12-24 13:49:29,354 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:49:29,354 INFO L402 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1] [2018-12-24 13:49:29,354 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:49:29,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:49:29,354 INFO L82 PathProgramCache]: Analyzing trace with hash -1796978306, now seen corresponding path program 34 times [2018-12-24 13:49:29,355 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:49:29,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:49:29,355 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:49:29,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:49:29,356 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:49:29,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:49:30,274 INFO L134 CoverageAnalysis]: Checked inductivity of 1410 backedges. 820 proven. 590 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:49:30,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:49:30,275 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:49:30,275 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:49:30,275 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:49:30,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:49:30,275 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-12-24 13:49:30,286 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:49:30,286 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:49:30,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:49:30,317 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:49:31,126 INFO L134 CoverageAnalysis]: Checked inductivity of 1410 backedges. 820 proven. 590 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:49:31,126 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:49:31,688 INFO L134 CoverageAnalysis]: Checked inductivity of 1410 backedges. 820 proven. 590 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:49:31,707 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:49:31,707 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 64 [2018-12-24 13:49:31,707 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:49:31,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-24 13:49:31,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-24 13:49:31,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=988, Invalid=3172, Unknown=0, NotChecked=0, Total=4160 [2018-12-24 13:49:31,708 INFO L87 Difference]: Start difference. First operand 147 states and 149 transitions. Second operand 65 states. [2018-12-24 13:49:33,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:49:33,296 INFO L93 Difference]: Finished difference Result 315 states and 319 transitions. [2018-12-24 13:49:33,296 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-12-24 13:49:33,296 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 146 [2018-12-24 13:49:33,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:49:33,298 INFO L225 Difference]: With dead ends: 315 [2018-12-24 13:49:33,298 INFO L226 Difference]: Without dead ends: 152 [2018-12-24 13:49:33,299 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 229 SyntacticMatches, 41 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2480 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1723, Invalid=5587, Unknown=0, NotChecked=0, Total=7310 [2018-12-24 13:49:33,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-12-24 13:49:33,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 150. [2018-12-24 13:49:33,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-12-24 13:49:33,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 152 transitions. [2018-12-24 13:49:33,334 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 152 transitions. Word has length 146 [2018-12-24 13:49:33,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:49:33,334 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 152 transitions. [2018-12-24 13:49:33,334 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-24 13:49:33,334 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 152 transitions. [2018-12-24 13:49:33,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-12-24 13:49:33,335 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:49:33,335 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 20, 20, 20, 1, 1, 1, 1, 1] [2018-12-24 13:49:33,336 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:49:33,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:49:33,336 INFO L82 PathProgramCache]: Analyzing trace with hash -193355018, now seen corresponding path program 35 times [2018-12-24 13:49:33,336 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:49:33,337 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:49:33,337 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:49:33,337 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:49:33,337 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:49:33,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:49:34,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1471 backedges. 20 proven. 1451 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:49:34,950 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:49:34,951 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:49:34,951 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:49:34,951 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:49:34,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:49:34,951 INFO 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 [2018-12-24 13:49:34,960 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:49:34,960 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:49:35,158 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-12-24 13:49:35,158 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:49:35,163 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:49:38,277 INFO L134 CoverageAnalysis]: Checked inductivity of 1471 backedges. 800 proven. 671 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:49:38,277 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:49:40,927 INFO L134 CoverageAnalysis]: Checked inductivity of 1471 backedges. 780 proven. 691 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:49:40,945 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:49:40,946 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 46, 46] total 113 [2018-12-24 13:49:40,946 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:49:40,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2018-12-24 13:49:40,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2018-12-24 13:49:40,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=11449, Unknown=0, NotChecked=0, Total=12882 [2018-12-24 13:49:40,948 INFO L87 Difference]: Start difference. First operand 150 states and 152 transitions. Second operand 91 states. [2018-12-24 13:49:52,821 WARN L181 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2018-12-24 13:49:53,138 WARN L181 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2018-12-24 13:49:53,527 WARN L181 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2018-12-24 13:49:53,801 WARN L181 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 13:49:54,086 WARN L181 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-24 13:49:56,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:49:56,513 INFO L93 Difference]: Finished difference Result 401 states and 407 transitions. [2018-12-24 13:49:56,513 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 149 states. [2018-12-24 13:49:56,514 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 149 [2018-12-24 13:49:56,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:49:56,515 INFO L225 Difference]: With dead ends: 401 [2018-12-24 13:49:56,515 INFO L226 Difference]: Without dead ends: 234 [2018-12-24 13:49:56,518 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 207 SyntacticMatches, 22 SemanticMatches, 238 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12431 ImplicationChecksByTransitivity, 18.9s TimeCoverageRelationStatistics Valid=4355, Invalid=53005, Unknown=0, NotChecked=0, Total=57360 [2018-12-24 13:49:56,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2018-12-24 13:49:56,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 157. [2018-12-24 13:49:56,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-12-24 13:49:56,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2018-12-24 13:49:56,551 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 149 [2018-12-24 13:49:56,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:49:56,551 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2018-12-24 13:49:56,551 INFO L481 AbstractCegarLoop]: Interpolant automaton has 91 states. [2018-12-24 13:49:56,552 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2018-12-24 13:49:56,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-12-24 13:49:56,552 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:49:56,553 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 1, 1, 1, 1, 1] [2018-12-24 13:49:56,553 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:49:56,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:49:56,553 INFO L82 PathProgramCache]: Analyzing trace with hash 1380130469, now seen corresponding path program 36 times [2018-12-24 13:49:56,553 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:49:56,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:49:56,554 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:49:56,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:49:56,554 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:49:56,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:49:58,975 INFO L134 CoverageAnalysis]: Checked inductivity of 1618 backedges. 21 proven. 1597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:49:58,975 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:49:58,975 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:49:58,975 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:49:58,975 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:49:58,975 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:49:58,975 INFO 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 [2018-12-24 13:49:58,986 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:49:58,986 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:49:59,012 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:49:59,012 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:49:59,015 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:50:00,359 INFO L134 CoverageAnalysis]: Checked inductivity of 1618 backedges. 21 proven. 1597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:00,359 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:50:00,500 INFO L134 CoverageAnalysis]: Checked inductivity of 1618 backedges. 21 proven. 1597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:00,518 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:50:00,518 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 70 [2018-12-24 13:50:00,518 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:50:00,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-24 13:50:00,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-24 13:50:00,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=4784, Unknown=0, NotChecked=0, Total=4970 [2018-12-24 13:50:00,519 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand 71 states. [2018-12-24 13:50:06,318 WARN L181 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2018-12-24 13:50:06,629 WARN L181 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2018-12-24 13:50:06,935 WARN L181 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2018-12-24 13:50:07,138 WARN L181 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 13:50:07,331 WARN L181 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 13:50:09,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:50:09,415 INFO L93 Difference]: Finished difference Result 334 states and 339 transitions. [2018-12-24 13:50:09,415 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-24 13:50:09,415 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 156 [2018-12-24 13:50:09,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:50:09,417 INFO L225 Difference]: With dead ends: 334 [2018-12-24 13:50:09,417 INFO L226 Difference]: Without dead ends: 248 [2018-12-24 13:50:09,418 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 285 SyntacticMatches, 3 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2078 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=869, Invalid=12241, Unknown=0, NotChecked=0, Total=13110 [2018-12-24 13:50:09,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2018-12-24 13:50:09,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 161. [2018-12-24 13:50:09,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2018-12-24 13:50:09,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 163 transitions. [2018-12-24 13:50:09,444 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 163 transitions. Word has length 156 [2018-12-24 13:50:09,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:50:09,444 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 163 transitions. [2018-12-24 13:50:09,444 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-24 13:50:09,445 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 163 transitions. [2018-12-24 13:50:09,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2018-12-24 13:50:09,445 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:50:09,446 INFO L402 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1] [2018-12-24 13:50:09,446 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:50:09,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:50:09,446 INFO L82 PathProgramCache]: Analyzing trace with hash -1719166132, now seen corresponding path program 37 times [2018-12-24 13:50:09,446 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:50:09,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:50:09,447 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:50:09,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:50:09,447 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:50:09,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:50:10,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 990 proven. 715 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:10,370 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:50:10,370 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:50:10,370 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:50:10,370 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:50:10,370 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:50:10,370 INFO 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 [2018-12-24 13:50:10,378 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:50:10,378 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:50:10,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:50:10,409 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:50:11,339 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 990 proven. 715 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:11,339 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:50:11,985 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 990 proven. 715 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:12,003 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:50:12,003 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 70 [2018-12-24 13:50:12,003 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:50:12,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-24 13:50:12,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-24 13:50:12,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=3796, Unknown=0, NotChecked=0, Total=4970 [2018-12-24 13:50:12,004 INFO L87 Difference]: Start difference. First operand 161 states and 163 transitions. Second operand 71 states. [2018-12-24 13:50:13,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:50:13,591 INFO L93 Difference]: Finished difference Result 345 states and 349 transitions. [2018-12-24 13:50:13,592 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-12-24 13:50:13,592 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 160 [2018-12-24 13:50:13,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:50:13,594 INFO L225 Difference]: With dead ends: 345 [2018-12-24 13:50:13,594 INFO L226 Difference]: Without dead ends: 166 [2018-12-24 13:50:13,595 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 251 SyntacticMatches, 45 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2992 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2048, Invalid=6694, Unknown=0, NotChecked=0, Total=8742 [2018-12-24 13:50:13,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-12-24 13:50:13,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 164. [2018-12-24 13:50:13,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2018-12-24 13:50:13,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 166 transitions. [2018-12-24 13:50:13,628 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 166 transitions. Word has length 160 [2018-12-24 13:50:13,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:50:13,628 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 166 transitions. [2018-12-24 13:50:13,628 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-24 13:50:13,628 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 166 transitions. [2018-12-24 13:50:13,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2018-12-24 13:50:13,628 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:50:13,629 INFO L402 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1] [2018-12-24 13:50:13,629 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:50:13,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:50:13,629 INFO L82 PathProgramCache]: Analyzing trace with hash -148438332, now seen corresponding path program 38 times [2018-12-24 13:50:13,629 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:50:13,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:50:13,630 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:50:13,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:50:13,630 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:50:13,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:50:15,318 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 22 proven. 1750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:15,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:50:15,318 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:50:15,318 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:50:15,318 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:50:15,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:50:15,318 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 [2018-12-24 13:50:15,327 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:50:15,327 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:50:15,371 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-24 13:50:15,371 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:50:15,375 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:50:16,796 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 22 proven. 1750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:16,796 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:50:16,960 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 22 proven. 1750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:16,979 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:50:16,979 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48, 48] total 73 [2018-12-24 13:50:16,979 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:50:16,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-24 13:50:16,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-24 13:50:16,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=5208, Unknown=0, NotChecked=0, Total=5402 [2018-12-24 13:50:16,980 INFO L87 Difference]: Start difference. First operand 164 states and 166 transitions. Second operand 74 states. [2018-12-24 13:50:23,949 WARN L181 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2018-12-24 13:50:24,424 WARN L181 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2018-12-24 13:50:24,738 WARN L181 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2018-12-24 13:50:24,949 WARN L181 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 13:50:25,149 WARN L181 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 13:50:27,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:50:27,364 INFO L93 Difference]: Finished difference Result 349 states and 354 transitions. [2018-12-24 13:50:27,364 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-24 13:50:27,364 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 163 [2018-12-24 13:50:27,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:50:27,366 INFO L225 Difference]: With dead ends: 349 [2018-12-24 13:50:27,366 INFO L226 Difference]: Without dead ends: 259 [2018-12-24 13:50:27,367 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 298 SyntacticMatches, 3 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2264 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=931, Invalid=13349, Unknown=0, NotChecked=0, Total=14280 [2018-12-24 13:50:27,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2018-12-24 13:50:27,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 168. [2018-12-24 13:50:27,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-12-24 13:50:27,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 170 transitions. [2018-12-24 13:50:27,399 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 170 transitions. Word has length 163 [2018-12-24 13:50:27,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:50:27,399 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 170 transitions. [2018-12-24 13:50:27,399 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-24 13:50:27,399 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 170 transitions. [2018-12-24 13:50:27,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-12-24 13:50:27,400 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:50:27,400 INFO L402 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1] [2018-12-24 13:50:27,400 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:50:27,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:50:27,401 INFO L82 PathProgramCache]: Analyzing trace with hash -1550952469, now seen corresponding path program 39 times [2018-12-24 13:50:27,401 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:50:27,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:50:27,401 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:50:27,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:50:27,402 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:50:27,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:50:28,300 INFO L134 CoverageAnalysis]: Checked inductivity of 1863 backedges. 1081 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:28,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:50:28,301 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:50:28,301 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:50:28,301 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:50:28,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:50:28,301 INFO 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 [2018-12-24 13:50:28,310 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:50:28,310 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:50:28,335 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:50:28,335 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:50:28,338 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:50:29,581 INFO L134 CoverageAnalysis]: Checked inductivity of 1863 backedges. 1081 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:29,581 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:50:30,291 INFO L134 CoverageAnalysis]: Checked inductivity of 1863 backedges. 1081 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:30,320 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:50:30,320 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 73 [2018-12-24 13:50:30,320 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:50:30,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-24 13:50:30,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-24 13:50:30,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2018-12-24 13:50:30,322 INFO L87 Difference]: Start difference. First operand 168 states and 170 transitions. Second operand 74 states. [2018-12-24 13:50:32,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:50:32,058 INFO L93 Difference]: Finished difference Result 360 states and 364 transitions. [2018-12-24 13:50:32,058 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-12-24 13:50:32,058 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 167 [2018-12-24 13:50:32,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:50:32,060 INFO L225 Difference]: With dead ends: 360 [2018-12-24 13:50:32,060 INFO L226 Difference]: Without dead ends: 173 [2018-12-24 13:50:32,061 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 262 SyntacticMatches, 47 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3266 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2221, Invalid=7285, Unknown=0, NotChecked=0, Total=9506 [2018-12-24 13:50:32,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2018-12-24 13:50:32,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 171. [2018-12-24 13:50:32,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-12-24 13:50:32,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 173 transitions. [2018-12-24 13:50:32,093 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 173 transitions. Word has length 167 [2018-12-24 13:50:32,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:50:32,094 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 173 transitions. [2018-12-24 13:50:32,094 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-24 13:50:32,094 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 173 transitions. [2018-12-24 13:50:32,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-12-24 13:50:32,094 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:50:32,095 INFO L402 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 23, 1, 1, 1, 1, 1] [2018-12-24 13:50:32,095 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:50:32,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:50:32,095 INFO L82 PathProgramCache]: Analyzing trace with hash -810935949, now seen corresponding path program 40 times [2018-12-24 13:50:32,095 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:50:32,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:50:32,096 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:50:32,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:50:32,096 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:50:32,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:50:33,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1933 backedges. 23 proven. 1910 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:33,787 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:50:33,787 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:50:33,787 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:50:33,788 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:50:33,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:50:33,788 INFO 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 [2018-12-24 13:50:33,797 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:50:33,797 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:50:33,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:50:33,832 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:50:35,799 INFO L134 CoverageAnalysis]: Checked inductivity of 1933 backedges. 23 proven. 1910 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:35,799 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:50:35,961 INFO L134 CoverageAnalysis]: Checked inductivity of 1933 backedges. 23 proven. 1910 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:35,980 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:50:35,980 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 76 [2018-12-24 13:50:35,980 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:50:35,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-24 13:50:35,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-24 13:50:35,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=5650, Unknown=0, NotChecked=0, Total=5852 [2018-12-24 13:50:35,981 INFO L87 Difference]: Start difference. First operand 171 states and 173 transitions. Second operand 77 states. [2018-12-24 13:50:43,401 WARN L181 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 123 [2018-12-24 13:50:43,746 WARN L181 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 123 [2018-12-24 13:50:44,076 WARN L181 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2018-12-24 13:50:44,300 WARN L181 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 13:50:44,582 WARN L181 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 13:50:44,812 WARN L181 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 13:50:45,015 WARN L181 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 13:50:47,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:50:47,165 INFO L93 Difference]: Finished difference Result 364 states and 369 transitions. [2018-12-24 13:50:47,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-24 13:50:47,165 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 170 [2018-12-24 13:50:47,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:50:47,166 INFO L225 Difference]: With dead ends: 364 [2018-12-24 13:50:47,167 INFO L226 Difference]: Without dead ends: 270 [2018-12-24 13:50:47,167 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 311 SyntacticMatches, 3 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2458 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=995, Invalid=14505, Unknown=0, NotChecked=0, Total=15500 [2018-12-24 13:50:47,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2018-12-24 13:50:47,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 175. [2018-12-24 13:50:47,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-12-24 13:50:47,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 177 transitions. [2018-12-24 13:50:47,202 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 177 transitions. Word has length 170 [2018-12-24 13:50:47,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:50:47,202 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 177 transitions. [2018-12-24 13:50:47,202 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-24 13:50:47,202 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 177 transitions. [2018-12-24 13:50:47,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-12-24 13:50:47,203 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:50:47,203 INFO L402 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1] [2018-12-24 13:50:47,203 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:50:47,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:50:47,203 INFO L82 PathProgramCache]: Analyzing trace with hash -1036484838, now seen corresponding path program 41 times [2018-12-24 13:50:47,204 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:50:47,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:50:47,204 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:50:47,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:50:47,204 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:50:47,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:50:48,595 INFO L134 CoverageAnalysis]: Checked inductivity of 2028 backedges. 1176 proven. 852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:48,595 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:50:48,595 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:50:48,595 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:50:48,596 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:50:48,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:50:48,596 INFO 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 [2018-12-24 13:50:48,613 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:50:48,613 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:50:48,717 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-12-24 13:50:48,718 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:50:48,721 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:50:50,316 INFO L134 CoverageAnalysis]: Checked inductivity of 2028 backedges. 1176 proven. 852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:50,316 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:50:51,111 INFO L134 CoverageAnalysis]: Checked inductivity of 2028 backedges. 1176 proven. 852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:51,129 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:50:51,129 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 76 [2018-12-24 13:50:51,129 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:50:51,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-24 13:50:51,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-24 13:50:51,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=4476, Unknown=0, NotChecked=0, Total=5852 [2018-12-24 13:50:51,131 INFO L87 Difference]: Start difference. First operand 175 states and 177 transitions. Second operand 77 states. [2018-12-24 13:50:53,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:50:53,024 INFO L93 Difference]: Finished difference Result 375 states and 379 transitions. [2018-12-24 13:50:53,024 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-12-24 13:50:53,025 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 174 [2018-12-24 13:50:53,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:50:53,026 INFO L225 Difference]: With dead ends: 375 [2018-12-24 13:50:53,026 INFO L226 Difference]: Without dead ends: 180 [2018-12-24 13:50:53,027 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 273 SyntacticMatches, 49 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3552 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2401, Invalid=7901, Unknown=0, NotChecked=0, Total=10302 [2018-12-24 13:50:53,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-12-24 13:50:53,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 178. [2018-12-24 13:50:53,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-12-24 13:50:53,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 180 transitions. [2018-12-24 13:50:53,063 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 180 transitions. Word has length 174 [2018-12-24 13:50:53,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:50:53,063 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 180 transitions. [2018-12-24 13:50:53,063 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-24 13:50:53,063 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 180 transitions. [2018-12-24 13:50:53,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-12-24 13:50:53,064 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:50:53,064 INFO L402 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 24, 24, 24, 1, 1, 1, 1, 1] [2018-12-24 13:50:53,064 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:50:53,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:50:53,064 INFO L82 PathProgramCache]: Analyzing trace with hash -1003391854, now seen corresponding path program 42 times [2018-12-24 13:50:53,064 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:50:53,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:50:53,065 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:50:53,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:50:53,065 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:50:53,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:50:54,984 INFO L134 CoverageAnalysis]: Checked inductivity of 2101 backedges. 24 proven. 2077 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:54,984 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:50:54,984 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:50:54,984 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:50:54,985 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:50:54,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:50:54,985 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 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 [2018-12-24 13:50:54,993 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:50:54,994 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:50:55,021 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:50:55,022 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:50:55,025 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:50:56,641 INFO L134 CoverageAnalysis]: Checked inductivity of 2101 backedges. 24 proven. 2077 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:56,642 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:50:56,836 INFO L134 CoverageAnalysis]: Checked inductivity of 2101 backedges. 24 proven. 2077 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:50:56,854 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:50:56,855 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52, 52] total 79 [2018-12-24 13:50:56,855 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:50:56,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2018-12-24 13:50:56,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2018-12-24 13:50:56,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=6110, Unknown=0, NotChecked=0, Total=6320 [2018-12-24 13:50:56,856 INFO L87 Difference]: Start difference. First operand 178 states and 180 transitions. Second operand 80 states. [2018-12-24 13:51:03,185 WARN L181 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2018-12-24 13:51:03,557 WARN L181 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2018-12-24 13:51:03,904 WARN L181 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 123 [2018-12-24 13:51:04,142 WARN L181 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 13:51:04,372 WARN L181 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 13:51:04,591 WARN L181 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 13:51:04,809 WARN L181 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 13:51:05,063 WARN L181 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 13:51:05,301 WARN L181 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-24 13:51:07,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:51:07,282 INFO L93 Difference]: Finished difference Result 379 states and 384 transitions. [2018-12-24 13:51:07,282 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2018-12-24 13:51:07,282 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 177 [2018-12-24 13:51:07,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:51:07,284 INFO L225 Difference]: With dead ends: 379 [2018-12-24 13:51:07,284 INFO L226 Difference]: Without dead ends: 281 [2018-12-24 13:51:07,285 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 324 SyntacticMatches, 3 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2660 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=1061, Invalid=15709, Unknown=0, NotChecked=0, Total=16770 [2018-12-24 13:51:07,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2018-12-24 13:51:07,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 182. [2018-12-24 13:51:07,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2018-12-24 13:51:07,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 184 transitions. [2018-12-24 13:51:07,327 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 184 transitions. Word has length 177 [2018-12-24 13:51:07,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:51:07,328 INFO L480 AbstractCegarLoop]: Abstraction has 182 states and 184 transitions. [2018-12-24 13:51:07,328 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2018-12-24 13:51:07,328 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 184 transitions. [2018-12-24 13:51:07,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2018-12-24 13:51:07,329 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:51:07,329 INFO L402 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1] [2018-12-24 13:51:07,329 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:51:07,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:51:07,329 INFO L82 PathProgramCache]: Analyzing trace with hash 525284025, now seen corresponding path program 43 times [2018-12-24 13:51:07,329 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:51:07,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:51:07,330 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:51:07,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:51:07,330 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:51:07,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:51:08,852 INFO L134 CoverageAnalysis]: Checked inductivity of 2200 backedges. 1275 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:51:08,852 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:51:08,852 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:51:08,852 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:51:08,852 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:51:08,852 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:51:08,852 INFO 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 [2018-12-24 13:51:08,862 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:51:08,862 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:51:08,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:51:08,899 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:51:10,069 INFO L134 CoverageAnalysis]: Checked inductivity of 2200 backedges. 1275 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:51:10,069 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:51:11,067 INFO L134 CoverageAnalysis]: Checked inductivity of 2200 backedges. 1275 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:51:11,085 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:51:11,085 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 79 [2018-12-24 13:51:11,085 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:51:11,085 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2018-12-24 13:51:11,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2018-12-24 13:51:11,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2018-12-24 13:51:11,086 INFO L87 Difference]: Start difference. First operand 182 states and 184 transitions. Second operand 80 states. [2018-12-24 13:51:13,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:51:13,032 INFO L93 Difference]: Finished difference Result 390 states and 394 transitions. [2018-12-24 13:51:13,033 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-12-24 13:51:13,033 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 181 [2018-12-24 13:51:13,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:51:13,034 INFO L225 Difference]: With dead ends: 390 [2018-12-24 13:51:13,034 INFO L226 Difference]: Without dead ends: 187 [2018-12-24 13:51:13,035 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 439 GetRequests, 284 SyntacticMatches, 51 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3850 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=2588, Invalid=8542, Unknown=0, NotChecked=0, Total=11130 [2018-12-24 13:51:13,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-12-24 13:51:13,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 185. [2018-12-24 13:51:13,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 185 states. [2018-12-24 13:51:13,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 187 transitions. [2018-12-24 13:51:13,078 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 187 transitions. Word has length 181 [2018-12-24 13:51:13,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:51:13,079 INFO L480 AbstractCegarLoop]: Abstraction has 185 states and 187 transitions. [2018-12-24 13:51:13,079 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2018-12-24 13:51:13,079 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 187 transitions. [2018-12-24 13:51:13,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2018-12-24 13:51:13,079 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:51:13,080 INFO L402 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 25, 25, 1, 1, 1, 1, 1] [2018-12-24 13:51:13,080 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:51:13,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:51:13,080 INFO L82 PathProgramCache]: Analyzing trace with hash -1479170495, now seen corresponding path program 44 times [2018-12-24 13:51:13,080 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:51:13,081 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:51:13,081 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:51:13,081 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:51:13,081 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:51:13,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:51:14,913 INFO L134 CoverageAnalysis]: Checked inductivity of 2276 backedges. 25 proven. 2251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:51:14,913 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:51:14,913 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:51:14,914 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:51:14,914 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:51:14,914 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:51:14,914 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 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 [2018-12-24 13:51:14,922 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:51:14,923 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:51:14,977 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-12-24 13:51:14,977 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:51:14,980 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:51:19,555 INFO L134 CoverageAnalysis]: Checked inductivity of 2276 backedges. 1250 proven. 1026 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:51:19,555 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:51:23,884 INFO L134 CoverageAnalysis]: Checked inductivity of 2276 backedges. 1225 proven. 1051 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:51:23,902 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:51:23,902 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 56, 56] total 138 [2018-12-24 13:51:23,903 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:51:23,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 111 states [2018-12-24 13:51:23,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2018-12-24 13:51:23,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2093, Invalid=17089, Unknown=0, NotChecked=0, Total=19182 [2018-12-24 13:51:23,904 INFO L87 Difference]: Start difference. First operand 185 states and 187 transitions. Second operand 111 states. [2018-12-24 13:51:41,827 WARN L181 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2018-12-24 13:51:42,263 WARN L181 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2018-12-24 13:51:42,723 WARN L181 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2018-12-24 13:51:43,117 WARN L181 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 13:51:43,483 WARN L181 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 13:51:43,854 WARN L181 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 13:51:44,198 WARN L181 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 13:51:44,523 WARN L181 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 13:51:46,066 WARN L181 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2018-12-24 13:51:48,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:51:48,133 INFO L93 Difference]: Finished difference Result 496 states and 502 transitions. [2018-12-24 13:51:48,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 184 states. [2018-12-24 13:51:48,133 INFO L78 Accepts]: Start accepts. Automaton has 111 states. Word has length 184 [2018-12-24 13:51:48,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:51:48,135 INFO L225 Difference]: With dead ends: 496 [2018-12-24 13:51:48,135 INFO L226 Difference]: Without dead ends: 289 [2018-12-24 13:51:48,138 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 577 GetRequests, 257 SyntacticMatches, 27 SemanticMatches, 293 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18831 ImplicationChecksByTransitivity, 28.3s TimeCoverageRelationStatistics Valid=6295, Invalid=80435, Unknown=0, NotChecked=0, Total=86730 [2018-12-24 13:51:48,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2018-12-24 13:51:48,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 192. [2018-12-24 13:51:48,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-12-24 13:51:48,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 194 transitions. [2018-12-24 13:51:48,178 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 194 transitions. Word has length 184 [2018-12-24 13:51:48,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:51:48,179 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 194 transitions. [2018-12-24 13:51:48,179 INFO L481 AbstractCegarLoop]: Interpolant automaton has 111 states. [2018-12-24 13:51:48,179 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 194 transitions. [2018-12-24 13:51:48,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-12-24 13:51:48,179 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:51:48,180 INFO L402 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 26, 26, 26, 1, 1, 1, 1, 1] [2018-12-24 13:51:48,180 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:51:48,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:51:48,180 INFO L82 PathProgramCache]: Analyzing trace with hash -1734936480, now seen corresponding path program 45 times [2018-12-24 13:51:48,180 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:51:48,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:51:48,181 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:51:48,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:51:48,181 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:51:48,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:51:50,092 INFO L134 CoverageAnalysis]: Checked inductivity of 2458 backedges. 26 proven. 2432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:51:50,092 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:51:50,092 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:51:50,093 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:51:50,093 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:51:50,093 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:51:50,093 INFO 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 [2018-12-24 13:51:50,101 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:51:50,101 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:51:50,130 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:51:50,130 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:51:50,134 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:51:52,262 INFO L134 CoverageAnalysis]: Checked inductivity of 2458 backedges. 26 proven. 2432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:51:52,263 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:51:52,561 INFO L134 CoverageAnalysis]: Checked inductivity of 2458 backedges. 26 proven. 2432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:51:52,580 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:51:52,580 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56, 56] total 85 [2018-12-24 13:51:52,581 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:51:52,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-24 13:51:52,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-24 13:51:52,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=7084, Unknown=0, NotChecked=0, Total=7310 [2018-12-24 13:51:52,582 INFO L87 Difference]: Start difference. First operand 192 states and 194 transitions. Second operand 86 states. [2018-12-24 13:52:00,822 WARN L181 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-12-24 13:52:01,268 WARN L181 SmtUtils]: Spent 211.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-12-24 13:52:01,759 WARN L181 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2018-12-24 13:52:02,018 WARN L181 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 13:52:02,276 WARN L181 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 13:52:02,531 WARN L181 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 13:52:02,775 WARN L181 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 13:52:03,021 WARN L181 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 13:52:03,280 WARN L181 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 13:52:03,504 WARN L181 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 13:52:05,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:52:05,849 INFO L93 Difference]: Finished difference Result 409 states and 414 transitions. [2018-12-24 13:52:05,849 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-12-24 13:52:05,849 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 191 [2018-12-24 13:52:05,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:52:05,851 INFO L225 Difference]: With dead ends: 409 [2018-12-24 13:52:05,851 INFO L226 Difference]: Without dead ends: 303 [2018-12-24 13:52:05,853 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 350 SyntacticMatches, 3 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3088 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=1199, Invalid=18261, Unknown=0, NotChecked=0, Total=19460 [2018-12-24 13:52:05,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2018-12-24 13:52:05,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 196. [2018-12-24 13:52:05,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-12-24 13:52:05,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 198 transitions. [2018-12-24 13:52:05,895 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 198 transitions. Word has length 191 [2018-12-24 13:52:05,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:52:05,896 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 198 transitions. [2018-12-24 13:52:05,896 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-24 13:52:05,896 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 198 transitions. [2018-12-24 13:52:05,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-12-24 13:52:05,896 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:52:05,896 INFO L402 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1] [2018-12-24 13:52:05,897 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:52:05,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:52:05,897 INFO L82 PathProgramCache]: Analyzing trace with hash 2056396679, now seen corresponding path program 46 times [2018-12-24 13:52:05,897 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:52:05,897 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:52:05,898 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:52:05,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:52:05,898 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:52:05,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:52:07,483 INFO L134 CoverageAnalysis]: Checked inductivity of 2565 backedges. 1485 proven. 1080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:52:07,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:52:07,483 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:52:07,484 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:52:07,484 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:52:07,484 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:52:07,484 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 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 [2018-12-24 13:52:07,492 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:52:07,492 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:52:07,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:52:07,535 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:52:08,944 INFO L134 CoverageAnalysis]: Checked inductivity of 2565 backedges. 1485 proven. 1080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:52:08,944 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:52:09,878 INFO L134 CoverageAnalysis]: Checked inductivity of 2565 backedges. 1485 proven. 1080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:52:09,897 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:52:09,898 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 85 [2018-12-24 13:52:09,898 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:52:09,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-24 13:52:09,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-24 13:52:09,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2018-12-24 13:52:09,899 INFO L87 Difference]: Start difference. First operand 196 states and 198 transitions. Second operand 86 states. [2018-12-24 13:52:12,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:52:12,422 INFO L93 Difference]: Finished difference Result 420 states and 424 transitions. [2018-12-24 13:52:12,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-12-24 13:52:12,427 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 195 [2018-12-24 13:52:12,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:52:12,428 INFO L225 Difference]: With dead ends: 420 [2018-12-24 13:52:12,428 INFO L226 Difference]: Without dead ends: 201 [2018-12-24 13:52:12,429 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 306 SyntacticMatches, 55 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4482 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=2983, Invalid=9899, Unknown=0, NotChecked=0, Total=12882 [2018-12-24 13:52:12,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2018-12-24 13:52:12,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 199. [2018-12-24 13:52:12,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-12-24 13:52:12,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 201 transitions. [2018-12-24 13:52:12,471 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 201 transitions. Word has length 195 [2018-12-24 13:52:12,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:52:12,472 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 201 transitions. [2018-12-24 13:52:12,472 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-24 13:52:12,472 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 201 transitions. [2018-12-24 13:52:12,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2018-12-24 13:52:12,472 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:52:12,473 INFO L402 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 27, 27, 27, 1, 1, 1, 1, 1] [2018-12-24 13:52:12,473 INFO L423 AbstractCegarLoop]: === Iteration 51 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:52:12,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:52:12,473 INFO L82 PathProgramCache]: Analyzing trace with hash -303839985, now seen corresponding path program 47 times [2018-12-24 13:52:12,473 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:52:12,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:52:12,474 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:52:12,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:52:12,474 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:52:12,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:52:14,486 INFO L134 CoverageAnalysis]: Checked inductivity of 2647 backedges. 27 proven. 2620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:52:14,486 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:52:14,486 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:52:14,486 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:52:14,487 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:52:14,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:52:14,487 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 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 [2018-12-24 13:52:14,495 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:52:14,496 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:52:14,550 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2018-12-24 13:52:14,550 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:52:14,554 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:52:16,558 INFO L134 CoverageAnalysis]: Checked inductivity of 2647 backedges. 27 proven. 2620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:52:16,559 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:52:16,975 INFO L134 CoverageAnalysis]: Checked inductivity of 2647 backedges. 27 proven. 2620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:52:16,993 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:52:16,994 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 88 [2018-12-24 13:52:16,994 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:52:16,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-24 13:52:16,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-24 13:52:16,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=7598, Unknown=0, NotChecked=0, Total=7832 [2018-12-24 13:52:16,995 INFO L87 Difference]: Start difference. First operand 199 states and 201 transitions. Second operand 89 states. [2018-12-24 13:52:25,473 WARN L181 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2018-12-24 13:52:25,880 WARN L181 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2018-12-24 13:52:26,280 WARN L181 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-12-24 13:52:26,565 WARN L181 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 13:52:26,882 WARN L181 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 13:52:27,209 WARN L181 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 13:52:27,466 WARN L181 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 13:52:27,729 WARN L181 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 13:52:27,963 WARN L181 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 13:52:28,220 WARN L181 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 13:52:28,449 WARN L181 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 13:52:30,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:52:30,897 INFO L93 Difference]: Finished difference Result 424 states and 429 transitions. [2018-12-24 13:52:30,897 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2018-12-24 13:52:30,897 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 198 [2018-12-24 13:52:30,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:52:30,899 INFO L225 Difference]: With dead ends: 424 [2018-12-24 13:52:30,899 INFO L226 Difference]: Without dead ends: 314 [2018-12-24 13:52:30,900 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 363 SyntacticMatches, 3 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3314 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=1271, Invalid=19609, Unknown=0, NotChecked=0, Total=20880 [2018-12-24 13:52:30,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2018-12-24 13:52:30,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 203. [2018-12-24 13:52:30,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 203 states. [2018-12-24 13:52:30,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 205 transitions. [2018-12-24 13:52:30,949 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 205 transitions. Word has length 198 [2018-12-24 13:52:30,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:52:30,950 INFO L480 AbstractCegarLoop]: Abstraction has 203 states and 205 transitions. [2018-12-24 13:52:30,950 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-24 13:52:30,950 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 205 transitions. [2018-12-24 13:52:30,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2018-12-24 13:52:30,951 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:52:30,951 INFO L402 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 28, 28, 1, 1, 1, 1, 1] [2018-12-24 13:52:30,951 INFO L423 AbstractCegarLoop]: === Iteration 52 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:52:30,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:52:30,951 INFO L82 PathProgramCache]: Analyzing trace with hash -1908736842, now seen corresponding path program 48 times [2018-12-24 13:52:30,952 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:52:30,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:52:30,952 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:52:30,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:52:30,952 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:52:30,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:52:32,647 INFO L134 CoverageAnalysis]: Checked inductivity of 2758 backedges. 1596 proven. 1162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:52:32,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:52:32,647 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:52:32,647 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:52:32,648 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:52:32,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:52:32,648 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-12-24 13:52:32,656 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:52:32,656 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:52:32,689 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:52:32,689 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:52:32,692 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:52:34,066 INFO L134 CoverageAnalysis]: Checked inductivity of 2758 backedges. 1596 proven. 1162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:52:34,067 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:52:35,140 INFO L134 CoverageAnalysis]: Checked inductivity of 2758 backedges. 1596 proven. 1162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:52:35,159 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:52:35,159 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 88 [2018-12-24 13:52:35,159 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:52:35,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-24 13:52:35,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-24 13:52:35,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1828, Invalid=6004, Unknown=0, NotChecked=0, Total=7832 [2018-12-24 13:52:35,160 INFO L87 Difference]: Start difference. First operand 203 states and 205 transitions. Second operand 89 states. [2018-12-24 13:52:37,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:52:37,869 INFO L93 Difference]: Finished difference Result 435 states and 439 transitions. [2018-12-24 13:52:37,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-12-24 13:52:37,869 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 202 [2018-12-24 13:52:37,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:52:37,871 INFO L225 Difference]: With dead ends: 435 [2018-12-24 13:52:37,871 INFO L226 Difference]: Without dead ends: 208 [2018-12-24 13:52:37,873 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 317 SyntacticMatches, 57 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4816 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3191, Invalid=10615, Unknown=0, NotChecked=0, Total=13806 [2018-12-24 13:52:37,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2018-12-24 13:52:37,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 206. [2018-12-24 13:52:37,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2018-12-24 13:52:37,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 208 transitions. [2018-12-24 13:52:37,928 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 208 transitions. Word has length 202 [2018-12-24 13:52:37,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:52:37,928 INFO L480 AbstractCegarLoop]: Abstraction has 206 states and 208 transitions. [2018-12-24 13:52:37,928 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-24 13:52:37,928 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 208 transitions. [2018-12-24 13:52:37,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2018-12-24 13:52:37,929 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:52:37,929 INFO L402 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 28, 28, 28, 1, 1, 1, 1, 1] [2018-12-24 13:52:37,929 INFO L423 AbstractCegarLoop]: === Iteration 53 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:52:37,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:52:37,929 INFO L82 PathProgramCache]: Analyzing trace with hash 1062571566, now seen corresponding path program 49 times [2018-12-24 13:52:37,929 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:52:37,930 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:52:37,930 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:52:37,930 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:52:37,930 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:52:37,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:52:40,121 INFO L134 CoverageAnalysis]: Checked inductivity of 2843 backedges. 28 proven. 2815 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:52:40,121 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:52:40,121 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:52:40,121 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:52:40,121 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:52:40,122 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:52:40,122 INFO 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 [2018-12-24 13:52:40,130 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:52:40,130 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:52:40,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:52:40,172 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:52:42,418 INFO L134 CoverageAnalysis]: Checked inductivity of 2843 backedges. 28 proven. 2815 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:52:42,418 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:52:42,673 INFO L134 CoverageAnalysis]: Checked inductivity of 2843 backedges. 28 proven. 2815 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:52:42,691 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:52:42,692 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 60, 60] total 91 [2018-12-24 13:52:42,692 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:52:42,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2018-12-24 13:52:42,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2018-12-24 13:52:42,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=8130, Unknown=0, NotChecked=0, Total=8372 [2018-12-24 13:52:42,693 INFO L87 Difference]: Start difference. First operand 206 states and 208 transitions. Second operand 92 states. [2018-12-24 13:52:51,590 WARN L181 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2018-12-24 13:52:52,039 WARN L181 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2018-12-24 13:52:52,574 WARN L181 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2018-12-24 13:52:52,882 WARN L181 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 13:52:53,175 WARN L181 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 13:52:53,457 WARN L181 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 13:52:53,738 WARN L181 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 13:52:54,011 WARN L181 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 13:52:54,296 WARN L181 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 13:52:54,546 WARN L181 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 13:52:54,787 WARN L181 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 13:52:55,016 WARN L181 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 13:52:57,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:52:57,589 INFO L93 Difference]: Finished difference Result 439 states and 444 transitions. [2018-12-24 13:52:57,589 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2018-12-24 13:52:57,589 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 205 [2018-12-24 13:52:57,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:52:57,591 INFO L225 Difference]: With dead ends: 439 [2018-12-24 13:52:57,591 INFO L226 Difference]: Without dead ends: 325 [2018-12-24 13:52:57,592 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 527 GetRequests, 376 SyntacticMatches, 3 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3548 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=1345, Invalid=21005, Unknown=0, NotChecked=0, Total=22350 [2018-12-24 13:52:57,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2018-12-24 13:52:57,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 210. [2018-12-24 13:52:57,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-12-24 13:52:57,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 212 transitions. [2018-12-24 13:52:57,651 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 212 transitions. Word has length 205 [2018-12-24 13:52:57,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:52:57,651 INFO L480 AbstractCegarLoop]: Abstraction has 210 states and 212 transitions. [2018-12-24 13:52:57,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2018-12-24 13:52:57,651 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 212 transitions. [2018-12-24 13:52:57,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-12-24 13:52:57,652 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:52:57,653 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1] [2018-12-24 13:52:57,653 INFO L423 AbstractCegarLoop]: === Iteration 54 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:52:57,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:52:57,653 INFO L82 PathProgramCache]: Analyzing trace with hash -782950827, now seen corresponding path program 50 times [2018-12-24 13:52:57,653 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:52:57,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:52:57,654 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:52:57,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:52:57,654 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:52:57,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:52:59,737 INFO L134 CoverageAnalysis]: Checked inductivity of 2958 backedges. 1711 proven. 1247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:52:59,737 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:52:59,737 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:52:59,738 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:52:59,738 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:52:59,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:52:59,738 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-12-24 13:52:59,751 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:52:59,751 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:52:59,810 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-12-24 13:52:59,810 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:52:59,814 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:53:01,355 INFO L134 CoverageAnalysis]: Checked inductivity of 2958 backedges. 1711 proven. 1247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:53:01,355 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:53:02,510 INFO L134 CoverageAnalysis]: Checked inductivity of 2958 backedges. 1711 proven. 1247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:53:02,529 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:53:02,529 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 91 [2018-12-24 13:53:02,530 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:53:02,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2018-12-24 13:53:02,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2018-12-24 13:53:02,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2018-12-24 13:53:02,531 INFO L87 Difference]: Start difference. First operand 210 states and 212 transitions. Second operand 92 states. [2018-12-24 13:53:05,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:53:05,187 INFO L93 Difference]: Finished difference Result 450 states and 454 transitions. [2018-12-24 13:53:05,188 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-12-24 13:53:05,188 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 209 [2018-12-24 13:53:05,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:53:05,190 INFO L225 Difference]: With dead ends: 450 [2018-12-24 13:53:05,191 INFO L226 Difference]: Without dead ends: 215 [2018-12-24 13:53:05,192 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 328 SyntacticMatches, 59 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5162 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=3406, Invalid=11356, Unknown=0, NotChecked=0, Total=14762 [2018-12-24 13:53:05,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2018-12-24 13:53:05,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 213. [2018-12-24 13:53:05,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2018-12-24 13:53:05,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 215 transitions. [2018-12-24 13:53:05,246 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 215 transitions. Word has length 209 [2018-12-24 13:53:05,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:53:05,247 INFO L480 AbstractCegarLoop]: Abstraction has 213 states and 215 transitions. [2018-12-24 13:53:05,247 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2018-12-24 13:53:05,247 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 215 transitions. [2018-12-24 13:53:05,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-12-24 13:53:05,248 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:53:05,248 INFO L402 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 29, 29, 29, 1, 1, 1, 1, 1] [2018-12-24 13:53:05,248 INFO L423 AbstractCegarLoop]: === Iteration 55 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:53:05,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:53:05,249 INFO L82 PathProgramCache]: Analyzing trace with hash -890079779, now seen corresponding path program 51 times [2018-12-24 13:53:05,249 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:53:05,249 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:53:05,249 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:53:05,249 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:53:05,250 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:53:05,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:53:07,433 INFO L134 CoverageAnalysis]: Checked inductivity of 3046 backedges. 29 proven. 3017 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:53:07,433 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:53:07,433 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:53:07,433 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:53:07,433 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:53:07,433 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:53:07,433 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 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 [2018-12-24 13:53:07,444 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:53:07,444 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:53:07,486 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:53:07,486 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:53:07,491 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:53:10,149 INFO L134 CoverageAnalysis]: Checked inductivity of 3046 backedges. 29 proven. 3017 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:53:10,149 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:53:10,392 INFO L134 CoverageAnalysis]: Checked inductivity of 3046 backedges. 29 proven. 3017 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:53:10,411 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:53:10,412 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 94 [2018-12-24 13:53:10,412 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:53:10,412 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-24 13:53:10,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-24 13:53:10,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=8680, Unknown=0, NotChecked=0, Total=8930 [2018-12-24 13:53:10,413 INFO L87 Difference]: Start difference. First operand 213 states and 215 transitions. Second operand 95 states. [2018-12-24 13:53:20,745 WARN L181 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 153 [2018-12-24 13:53:21,211 WARN L181 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 153 [2018-12-24 13:53:21,675 WARN L181 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2018-12-24 13:53:22,000 WARN L181 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-24 13:53:22,314 WARN L181 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 13:53:22,621 WARN L181 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 13:53:22,916 WARN L181 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 13:53:23,278 WARN L181 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 13:53:23,583 WARN L181 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 13:53:23,856 WARN L181 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 13:53:24,105 WARN L181 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 13:53:24,342 WARN L181 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 13:53:27,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:53:27,055 INFO L93 Difference]: Finished difference Result 454 states and 459 transitions. [2018-12-24 13:53:27,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2018-12-24 13:53:27,056 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 212 [2018-12-24 13:53:27,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:53:27,058 INFO L225 Difference]: With dead ends: 454 [2018-12-24 13:53:27,058 INFO L226 Difference]: Without dead ends: 336 [2018-12-24 13:53:27,059 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 545 GetRequests, 389 SyntacticMatches, 3 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3790 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=1421, Invalid=22449, Unknown=0, NotChecked=0, Total=23870 [2018-12-24 13:53:27,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2018-12-24 13:53:27,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 217. [2018-12-24 13:53:27,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2018-12-24 13:53:27,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 219 transitions. [2018-12-24 13:53:27,117 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 219 transitions. Word has length 212 [2018-12-24 13:53:27,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:53:27,117 INFO L480 AbstractCegarLoop]: Abstraction has 217 states and 219 transitions. [2018-12-24 13:53:27,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-24 13:53:27,117 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 219 transitions. [2018-12-24 13:53:27,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2018-12-24 13:53:27,118 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:53:27,118 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 30, 30, 1, 1, 1, 1, 1] [2018-12-24 13:53:27,118 INFO L423 AbstractCegarLoop]: === Iteration 56 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:53:27,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:53:27,119 INFO L82 PathProgramCache]: Analyzing trace with hash -272066940, now seen corresponding path program 52 times [2018-12-24 13:53:27,119 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:53:27,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:53:27,119 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:53:27,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:53:27,119 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:53:27,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:53:28,653 INFO L134 CoverageAnalysis]: Checked inductivity of 3165 backedges. 1830 proven. 1335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:53:28,653 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:53:28,653 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:53:28,653 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:53:28,653 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:53:28,653 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:53:28,654 INFO 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 [2018-12-24 13:53:28,664 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:53:28,664 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:53:28,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:53:28,705 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:53:30,256 INFO L134 CoverageAnalysis]: Checked inductivity of 3165 backedges. 1830 proven. 1335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:53:30,256 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:53:31,456 INFO L134 CoverageAnalysis]: Checked inductivity of 3165 backedges. 1830 proven. 1335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:53:31,477 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:53:31,477 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 94 [2018-12-24 13:53:31,477 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:53:31,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-24 13:53:31,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-24 13:53:31,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2078, Invalid=6852, Unknown=0, NotChecked=0, Total=8930 [2018-12-24 13:53:31,479 INFO L87 Difference]: Start difference. First operand 217 states and 219 transitions. Second operand 95 states. [2018-12-24 13:53:34,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:53:34,419 INFO L93 Difference]: Finished difference Result 465 states and 469 transitions. [2018-12-24 13:53:34,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-12-24 13:53:34,420 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 216 [2018-12-24 13:53:34,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:53:34,421 INFO L225 Difference]: With dead ends: 465 [2018-12-24 13:53:34,421 INFO L226 Difference]: Without dead ends: 222 [2018-12-24 13:53:34,422 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 524 GetRequests, 339 SyntacticMatches, 61 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5520 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3628, Invalid=12122, Unknown=0, NotChecked=0, Total=15750 [2018-12-24 13:53:34,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-12-24 13:53:34,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 220. [2018-12-24 13:53:34,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2018-12-24 13:53:34,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 222 transitions. [2018-12-24 13:53:34,476 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 222 transitions. Word has length 216 [2018-12-24 13:53:34,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:53:34,477 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 222 transitions. [2018-12-24 13:53:34,477 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-24 13:53:34,477 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 222 transitions. [2018-12-24 13:53:34,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2018-12-24 13:53:34,478 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:53:34,478 INFO L402 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 30, 30, 30, 1, 1, 1, 1, 1] [2018-12-24 13:53:34,478 INFO L423 AbstractCegarLoop]: === Iteration 57 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:53:34,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:53:34,478 INFO L82 PathProgramCache]: Analyzing trace with hash 292238844, now seen corresponding path program 53 times [2018-12-24 13:53:34,478 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:53:34,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:53:34,479 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:53:34,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:53:34,479 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:53:34,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:53:36,749 INFO L134 CoverageAnalysis]: Checked inductivity of 3256 backedges. 30 proven. 3226 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:53:36,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:53:36,749 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:53:36,749 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:53:36,749 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:53:36,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:53:36,749 INFO 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 [2018-12-24 13:53:36,758 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:53:36,758 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:53:36,829 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-12-24 13:53:36,829 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:53:36,834 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:53:42,947 INFO L134 CoverageAnalysis]: Checked inductivity of 3256 backedges. 1800 proven. 1456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:53:42,947 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:53:48,680 INFO L134 CoverageAnalysis]: Checked inductivity of 3256 backedges. 1770 proven. 1486 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:53:48,699 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:53:48,700 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 66, 66] total 163 [2018-12-24 13:53:48,700 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:53:48,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2018-12-24 13:53:48,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2018-12-24 13:53:48,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2878, Invalid=23854, Unknown=0, NotChecked=0, Total=26732 [2018-12-24 13:53:48,701 INFO L87 Difference]: Start difference. First operand 220 states and 222 transitions. Second operand 131 states. [2018-12-24 13:54:13,175 WARN L181 SmtUtils]: Spent 203.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2018-12-24 13:54:13,773 WARN L181 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2018-12-24 13:54:14,427 WARN L181 SmtUtils]: Spent 247.00 ms on a formula simplification that was a NOOP. DAG size: 153 [2018-12-24 13:54:14,930 WARN L181 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-24 13:54:15,405 WARN L181 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-24 13:54:15,880 WARN L181 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 13:54:16,337 WARN L181 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 13:54:16,793 WARN L181 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 13:54:17,218 WARN L181 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 13:54:17,633 WARN L181 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 13:54:18,031 WARN L181 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 13:54:18,411 WARN L181 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 13:54:18,773 WARN L181 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 13:54:19,518 WARN L181 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-24 13:54:22,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:54:22,855 INFO L93 Difference]: Finished difference Result 591 states and 597 transitions. [2018-12-24 13:54:22,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 219 states. [2018-12-24 13:54:22,855 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 219 [2018-12-24 13:54:22,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:54:22,857 INFO L225 Difference]: With dead ends: 591 [2018-12-24 13:54:22,857 INFO L226 Difference]: Without dead ends: 344 [2018-12-24 13:54:22,861 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 687 GetRequests, 307 SyntacticMatches, 32 SemanticMatches, 348 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26556 ImplicationChecksByTransitivity, 38.9s TimeCoverageRelationStatistics Valid=8585, Invalid=113565, Unknown=0, NotChecked=0, Total=122150 [2018-12-24 13:54:22,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2018-12-24 13:54:22,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 227. [2018-12-24 13:54:22,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 227 states. [2018-12-24 13:54:22,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 229 transitions. [2018-12-24 13:54:22,915 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 229 transitions. Word has length 219 [2018-12-24 13:54:22,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:54:22,915 INFO L480 AbstractCegarLoop]: Abstraction has 227 states and 229 transitions. [2018-12-24 13:54:22,915 INFO L481 AbstractCegarLoop]: Interpolant automaton has 131 states. [2018-12-24 13:54:22,915 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 229 transitions. [2018-12-24 13:54:22,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2018-12-24 13:54:22,916 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:54:22,916 INFO L402 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 31, 31, 31, 1, 1, 1, 1, 1] [2018-12-24 13:54:22,916 INFO L423 AbstractCegarLoop]: === Iteration 58 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:54:22,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:54:22,916 INFO L82 PathProgramCache]: Analyzing trace with hash 2116008107, now seen corresponding path program 54 times [2018-12-24 13:54:22,916 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:54:22,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:54:22,917 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:54:22,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:54:22,917 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:54:22,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:54:25,641 INFO L134 CoverageAnalysis]: Checked inductivity of 3473 backedges. 31 proven. 3442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:54:25,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:54:25,641 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:54:25,641 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:54:25,642 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:54:25,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:54:25,642 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-12-24 13:54:25,650 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:54:25,651 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:54:25,689 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:54:25,690 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:54:25,694 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:54:28,295 INFO L134 CoverageAnalysis]: Checked inductivity of 3473 backedges. 31 proven. 3442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:54:28,295 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:54:28,560 INFO L134 CoverageAnalysis]: Checked inductivity of 3473 backedges. 31 proven. 3442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:54:28,578 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:54:28,579 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 66, 66] total 100 [2018-12-24 13:54:28,579 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:54:28,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-24 13:54:28,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-24 13:54:28,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=9834, Unknown=0, NotChecked=0, Total=10100 [2018-12-24 13:54:28,580 INFO L87 Difference]: Start difference. First operand 227 states and 229 transitions. Second operand 101 states. [2018-12-24 13:54:41,812 WARN L181 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 163 [2018-12-24 13:54:42,324 WARN L181 SmtUtils]: Spent 211.00 ms on a formula simplification that was a NOOP. DAG size: 163 [2018-12-24 13:54:42,818 WARN L181 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2018-12-24 13:54:43,176 WARN L181 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-24 13:54:43,507 WARN L181 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-24 13:54:43,840 WARN L181 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-24 13:54:44,150 WARN L181 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 13:54:44,451 WARN L181 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 13:54:44,749 WARN L181 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 13:54:45,081 WARN L181 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 13:54:45,418 WARN L181 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 13:54:45,689 WARN L181 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 13:54:45,958 WARN L181 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 13:54:46,209 WARN L181 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 13:54:49,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:54:49,118 INFO L93 Difference]: Finished difference Result 484 states and 489 transitions. [2018-12-24 13:54:49,119 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2018-12-24 13:54:49,119 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 226 [2018-12-24 13:54:49,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:54:49,120 INFO L225 Difference]: With dead ends: 484 [2018-12-24 13:54:49,120 INFO L226 Difference]: Without dead ends: 358 [2018-12-24 13:54:49,121 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 581 GetRequests, 415 SyntacticMatches, 3 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4298 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=1579, Invalid=25481, Unknown=0, NotChecked=0, Total=27060 [2018-12-24 13:54:49,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2018-12-24 13:54:49,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 231. [2018-12-24 13:54:49,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 231 states. [2018-12-24 13:54:49,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 233 transitions. [2018-12-24 13:54:49,181 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 233 transitions. Word has length 226 [2018-12-24 13:54:49,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:54:49,182 INFO L480 AbstractCegarLoop]: Abstraction has 231 states and 233 transitions. [2018-12-24 13:54:49,182 INFO L481 AbstractCegarLoop]: Interpolant automaton has 101 states. [2018-12-24 13:54:49,182 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 233 transitions. [2018-12-24 13:54:49,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2018-12-24 13:54:49,183 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:54:49,183 INFO L402 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 32, 32, 1, 1, 1, 1, 1] [2018-12-24 13:54:49,183 INFO L423 AbstractCegarLoop]: === Iteration 59 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:54:49,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:54:49,184 INFO L82 PathProgramCache]: Analyzing trace with hash -237256110, now seen corresponding path program 55 times [2018-12-24 13:54:49,184 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:54:49,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:54:49,184 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:54:49,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:54:49,185 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:54:49,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:54:50,926 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 2080 proven. 1520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:54:50,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:54:50,926 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:54:50,926 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:54:50,926 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:54:50,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:54:50,926 INFO 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 [2018-12-24 13:54:50,937 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:54:50,937 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:54:50,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:54:50,985 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:54:54,410 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 2080 proven. 1520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:54:54,410 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:54:56,209 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 2080 proven. 1520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:54:56,228 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:54:56,228 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 100 [2018-12-24 13:54:56,228 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:54:56,229 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-24 13:54:56,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-24 13:54:56,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2344, Invalid=7756, Unknown=0, NotChecked=0, Total=10100 [2018-12-24 13:54:56,229 INFO L87 Difference]: Start difference. First operand 231 states and 233 transitions. Second operand 101 states. [2018-12-24 13:54:58,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:54:58,568 INFO L93 Difference]: Finished difference Result 495 states and 499 transitions. [2018-12-24 13:54:58,568 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-12-24 13:54:58,568 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 230 [2018-12-24 13:54:58,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:54:58,570 INFO L225 Difference]: With dead ends: 495 [2018-12-24 13:54:58,570 INFO L226 Difference]: Without dead ends: 236 [2018-12-24 13:54:58,571 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 558 GetRequests, 361 SyntacticMatches, 65 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6272 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2018-12-24 13:54:58,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2018-12-24 13:54:58,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 234. [2018-12-24 13:54:58,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2018-12-24 13:54:58,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 236 transitions. [2018-12-24 13:54:58,632 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 236 transitions. Word has length 230 [2018-12-24 13:54:58,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:54:58,633 INFO L480 AbstractCegarLoop]: Abstraction has 234 states and 236 transitions. [2018-12-24 13:54:58,633 INFO L481 AbstractCegarLoop]: Interpolant automaton has 101 states. [2018-12-24 13:54:58,633 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 236 transitions. [2018-12-24 13:54:58,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2018-12-24 13:54:58,634 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:54:58,634 INFO L402 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 32, 32, 32, 1, 1, 1, 1, 1] [2018-12-24 13:54:58,634 INFO L423 AbstractCegarLoop]: === Iteration 60 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:54:58,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:54:58,635 INFO L82 PathProgramCache]: Analyzing trace with hash -170528822, now seen corresponding path program 56 times [2018-12-24 13:54:58,635 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:54:58,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:54:58,635 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:54:58,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:54:58,636 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:54:58,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:55:01,390 INFO L134 CoverageAnalysis]: Checked inductivity of 3697 backedges. 32 proven. 3665 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:55:01,391 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:55:01,391 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:55:01,391 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:55:01,391 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:55:01,391 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:55:01,391 INFO 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 [2018-12-24 13:55:01,399 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:55:01,399 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:55:01,470 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-12-24 13:55:01,470 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:55:01,474 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:55:08,336 INFO L134 CoverageAnalysis]: Checked inductivity of 3697 backedges. 2048 proven. 1649 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:55:08,336 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:55:14,709 INFO L134 CoverageAnalysis]: Checked inductivity of 3697 backedges. 2016 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:55:14,728 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:55:14,728 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 70, 70] total 173 [2018-12-24 13:55:14,728 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:55:14,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 139 states [2018-12-24 13:55:14,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2018-12-24 13:55:14,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3227, Invalid=26875, Unknown=0, NotChecked=0, Total=30102 [2018-12-24 13:55:14,730 INFO L87 Difference]: Start difference. First operand 234 states and 236 transitions. Second operand 139 states. [2018-12-24 13:55:40,448 WARN L181 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 168 [2018-12-24 13:55:41,043 WARN L181 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 168 [2018-12-24 13:55:41,752 WARN L181 SmtUtils]: Spent 257.00 ms on a formula simplification that was a NOOP. DAG size: 163 [2018-12-24 13:55:42,303 WARN L181 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-24 13:55:42,830 WARN L181 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-24 13:55:43,339 WARN L181 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-24 13:55:43,850 WARN L181 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-24 13:55:44,338 WARN L181 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 13:55:44,805 WARN L181 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 13:55:45,276 WARN L181 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 13:55:45,745 WARN L181 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 13:55:46,189 WARN L181 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 13:55:46,685 WARN L181 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 13:55:47,094 WARN L181 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 13:55:47,480 WARN L181 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 13:55:47,851 WARN L181 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 13:55:51,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:55:51,860 INFO L93 Difference]: Finished difference Result 629 states and 635 transitions. [2018-12-24 13:55:51,860 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 233 states. [2018-12-24 13:55:51,860 INFO L78 Accepts]: Start accepts. Automaton has 139 states. Word has length 233 [2018-12-24 13:55:51,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:55:51,862 INFO L225 Difference]: With dead ends: 629 [2018-12-24 13:55:51,862 INFO L226 Difference]: Without dead ends: 366 [2018-12-24 13:55:51,865 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 731 GetRequests, 327 SyntacticMatches, 34 SemanticMatches, 370 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30017 ImplicationChecksByTransitivity, 44.3s TimeCoverageRelationStatistics Valid=9599, Invalid=128413, Unknown=0, NotChecked=0, Total=138012 [2018-12-24 13:55:51,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2018-12-24 13:55:51,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 241. [2018-12-24 13:55:51,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2018-12-24 13:55:51,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 243 transitions. [2018-12-24 13:55:51,926 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 243 transitions. Word has length 233 [2018-12-24 13:55:51,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:55:51,926 INFO L480 AbstractCegarLoop]: Abstraction has 241 states and 243 transitions. [2018-12-24 13:55:51,926 INFO L481 AbstractCegarLoop]: Interpolant automaton has 139 states. [2018-12-24 13:55:51,927 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 243 transitions. [2018-12-24 13:55:51,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2018-12-24 13:55:51,927 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:55:51,928 INFO L402 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 33, 33, 33, 1, 1, 1, 1, 1] [2018-12-24 13:55:51,928 INFO L423 AbstractCegarLoop]: === Iteration 61 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:55:51,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:55:51,928 INFO L82 PathProgramCache]: Analyzing trace with hash 1552518521, now seen corresponding path program 57 times [2018-12-24 13:55:51,928 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:55:51,928 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:55:51,929 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:55:51,929 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:55:51,929 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:55:51,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:55:54,671 INFO L134 CoverageAnalysis]: Checked inductivity of 3928 backedges. 33 proven. 3895 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:55:54,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:55:54,672 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:55:54,672 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:55:54,672 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:55:54,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:55:54,672 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 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 [2018-12-24 13:55:54,697 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:55:54,698 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:55:54,736 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:55:54,736 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:55:54,740 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:55:57,803 INFO L134 CoverageAnalysis]: Checked inductivity of 3928 backedges. 33 proven. 3895 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:55:57,804 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:55:58,082 INFO L134 CoverageAnalysis]: Checked inductivity of 3928 backedges. 33 proven. 3895 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:55:58,100 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:55:58,100 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70, 70] total 106 [2018-12-24 13:55:58,100 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:55:58,101 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-12-24 13:55:58,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-12-24 13:55:58,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=11060, Unknown=0, NotChecked=0, Total=11342 [2018-12-24 13:55:58,102 INFO L87 Difference]: Start difference. First operand 241 states and 243 transitions. Second operand 107 states. [2018-12-24 13:56:10,242 WARN L181 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 173 [2018-12-24 13:56:10,778 WARN L181 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 173 [2018-12-24 13:56:11,326 WARN L181 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 168 [2018-12-24 13:56:11,715 WARN L181 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-24 13:56:12,119 WARN L181 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-24 13:56:12,522 WARN L181 SmtUtils]: Spent 226.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-24 13:56:12,879 WARN L181 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-24 13:56:13,233 WARN L181 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-24 13:56:13,568 WARN L181 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 13:56:13,896 WARN L181 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 13:56:14,219 WARN L181 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 13:56:14,522 WARN L181 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 13:56:14,842 WARN L181 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 13:56:15,134 WARN L181 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 13:56:15,408 WARN L181 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 13:56:15,678 WARN L181 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 13:56:15,960 WARN L181 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 13:56:17,361 WARN L181 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2018-12-24 13:56:18,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:56:18,898 INFO L93 Difference]: Finished difference Result 514 states and 519 transitions. [2018-12-24 13:56:18,898 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2018-12-24 13:56:18,899 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 240 [2018-12-24 13:56:18,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:56:18,901 INFO L225 Difference]: With dead ends: 514 [2018-12-24 13:56:18,901 INFO L226 Difference]: Without dead ends: 380 [2018-12-24 13:56:18,902 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 617 GetRequests, 441 SyntacticMatches, 3 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4838 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=1745, Invalid=28705, Unknown=0, NotChecked=0, Total=30450 [2018-12-24 13:56:18,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2018-12-24 13:56:18,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 245. [2018-12-24 13:56:18,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245 states. [2018-12-24 13:56:18,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 247 transitions. [2018-12-24 13:56:18,967 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 247 transitions. Word has length 240 [2018-12-24 13:56:18,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:56:18,967 INFO L480 AbstractCegarLoop]: Abstraction has 245 states and 247 transitions. [2018-12-24 13:56:18,967 INFO L481 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-12-24 13:56:18,967 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 247 transitions. [2018-12-24 13:56:18,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2018-12-24 13:56:18,968 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:56:18,968 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 34, 34, 1, 1, 1, 1, 1] [2018-12-24 13:56:18,968 INFO L423 AbstractCegarLoop]: === Iteration 62 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:56:18,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:56:18,968 INFO L82 PathProgramCache]: Analyzing trace with hash 714244128, now seen corresponding path program 58 times [2018-12-24 13:56:18,969 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:56:18,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:56:18,969 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:56:18,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:56:18,969 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:56:18,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:56:20,568 INFO L134 CoverageAnalysis]: Checked inductivity of 4063 backedges. 2346 proven. 1717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:56:20,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:56:20,568 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:56:20,568 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:56:20,569 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:56:20,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:56:20,569 INFO 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 [2018-12-24 13:56:20,577 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:56:20,578 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:56:20,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:56:20,626 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:56:22,788 INFO L134 CoverageAnalysis]: Checked inductivity of 4063 backedges. 2346 proven. 1717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:56:22,788 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:56:24,303 INFO L134 CoverageAnalysis]: Checked inductivity of 4063 backedges. 2346 proven. 1717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:56:24,323 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:56:24,323 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 106 [2018-12-24 13:56:24,323 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:56:24,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-12-24 13:56:24,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-12-24 13:56:24,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=8716, Unknown=0, NotChecked=0, Total=11342 [2018-12-24 13:56:24,325 INFO L87 Difference]: Start difference. First operand 245 states and 247 transitions. Second operand 107 states. [2018-12-24 13:56:26,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:56:26,909 INFO L93 Difference]: Finished difference Result 525 states and 529 transitions. [2018-12-24 13:56:26,910 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-24 13:56:26,910 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 244 [2018-12-24 13:56:26,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:56:26,911 INFO L225 Difference]: With dead ends: 525 [2018-12-24 13:56:26,911 INFO L226 Difference]: Without dead ends: 250 [2018-12-24 13:56:26,913 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 383 SyntacticMatches, 69 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7072 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=4586, Invalid=15436, Unknown=0, NotChecked=0, Total=20022 [2018-12-24 13:56:26,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2018-12-24 13:56:26,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 248. [2018-12-24 13:56:26,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2018-12-24 13:56:26,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 250 transitions. [2018-12-24 13:56:26,981 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 250 transitions. Word has length 244 [2018-12-24 13:56:26,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:56:26,981 INFO L480 AbstractCegarLoop]: Abstraction has 248 states and 250 transitions. [2018-12-24 13:56:26,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-12-24 13:56:26,982 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 250 transitions. [2018-12-24 13:56:26,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2018-12-24 13:56:26,983 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:56:26,983 INFO L402 BasicCegarLoop]: trace histogram [35, 35, 35, 35, 34, 34, 34, 1, 1, 1, 1, 1] [2018-12-24 13:56:26,983 INFO L423 AbstractCegarLoop]: === Iteration 63 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:56:26,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:56:26,984 INFO L82 PathProgramCache]: Analyzing trace with hash 1637071768, now seen corresponding path program 59 times [2018-12-24 13:56:26,984 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:56:26,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:56:26,984 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:56:26,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:56:26,985 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:56:26,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:56:29,995 INFO L134 CoverageAnalysis]: Checked inductivity of 4166 backedges. 34 proven. 4132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:56:29,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:56:29,996 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:56:29,996 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:56:29,996 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:56:29,996 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:56:29,996 INFO 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 [2018-12-24 13:56:30,017 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:56:30,017 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:56:30,092 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-12-24 13:56:30,092 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:56:30,096 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:56:37,695 INFO L134 CoverageAnalysis]: Checked inductivity of 4166 backedges. 2312 proven. 1854 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:56:37,695 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:56:44,961 INFO L134 CoverageAnalysis]: Checked inductivity of 4166 backedges. 2278 proven. 1888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:56:44,980 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:56:44,980 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 74, 74] total 183 [2018-12-24 13:56:44,980 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:56:44,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 147 states [2018-12-24 13:56:44,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 147 interpolants. [2018-12-24 13:56:44,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3596, Invalid=30076, Unknown=0, NotChecked=0, Total=33672 [2018-12-24 13:56:44,982 INFO L87 Difference]: Start difference. First operand 248 states and 250 transitions. Second operand 147 states. [2018-12-24 13:57:13,018 WARN L181 SmtUtils]: Spent 246.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2018-12-24 13:57:13,754 WARN L181 SmtUtils]: Spent 313.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2018-12-24 13:57:14,424 WARN L181 SmtUtils]: Spent 226.00 ms on a formula simplification that was a NOOP. DAG size: 173 [2018-12-24 13:57:15,041 WARN L181 SmtUtils]: Spent 215.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-24 13:57:15,658 WARN L181 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-24 13:57:16,238 WARN L181 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-24 13:57:16,807 WARN L181 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-24 13:57:17,363 WARN L181 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-24 13:57:17,896 WARN L181 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-24 13:57:18,424 WARN L181 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 13:57:18,989 WARN L181 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 13:57:19,484 WARN L181 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 13:57:19,962 WARN L181 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 13:57:20,441 WARN L181 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 13:57:20,892 WARN L181 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 13:57:21,326 WARN L181 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 13:57:21,744 WARN L181 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 13:57:22,140 WARN L181 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 13:57:26,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:57:26,378 INFO L93 Difference]: Finished difference Result 667 states and 673 transitions. [2018-12-24 13:57:26,378 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 247 states. [2018-12-24 13:57:26,378 INFO L78 Accepts]: Start accepts. Automaton has 147 states. Word has length 247 [2018-12-24 13:57:26,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:57:26,380 INFO L225 Difference]: With dead ends: 667 [2018-12-24 13:57:26,380 INFO L226 Difference]: Without dead ends: 388 [2018-12-24 13:57:26,384 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 775 GetRequests, 347 SyntacticMatches, 36 SemanticMatches, 392 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33690 ImplicationChecksByTransitivity, 50.0s TimeCoverageRelationStatistics Valid=10669, Invalid=144173, Unknown=0, NotChecked=0, Total=154842 [2018-12-24 13:57:26,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 388 states. [2018-12-24 13:57:26,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 388 to 255. [2018-12-24 13:57:26,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 255 states. [2018-12-24 13:57:26,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 257 transitions. [2018-12-24 13:57:26,452 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 257 transitions. Word has length 247 [2018-12-24 13:57:26,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:57:26,453 INFO L480 AbstractCegarLoop]: Abstraction has 255 states and 257 transitions. [2018-12-24 13:57:26,453 INFO L481 AbstractCegarLoop]: Interpolant automaton has 147 states. [2018-12-24 13:57:26,453 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 257 transitions. [2018-12-24 13:57:26,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2018-12-24 13:57:26,454 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:57:26,454 INFO L402 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 35, 35, 35, 1, 1, 1, 1, 1] [2018-12-24 13:57:26,454 INFO L423 AbstractCegarLoop]: === Iteration 64 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:57:26,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:57:26,455 INFO L82 PathProgramCache]: Analyzing trace with hash -783420345, now seen corresponding path program 60 times [2018-12-24 13:57:26,455 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:57:26,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:57:26,456 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:57:26,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:57:26,456 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:57:26,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:57:29,703 INFO L134 CoverageAnalysis]: Checked inductivity of 4411 backedges. 35 proven. 4376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:57:29,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:57:29,703 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:57:29,703 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:57:29,703 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:57:29,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:57:29,703 INFO 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 [2018-12-24 13:57:29,712 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:57:29,713 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:57:29,755 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:57:29,755 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:57:29,760 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:57:32,972 INFO L134 CoverageAnalysis]: Checked inductivity of 4411 backedges. 35 proven. 4376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:57:32,972 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:57:33,247 INFO L134 CoverageAnalysis]: Checked inductivity of 4411 backedges. 35 proven. 4376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:57:33,265 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:57:33,266 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 74, 74] total 112 [2018-12-24 13:57:33,266 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:57:33,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2018-12-24 13:57:33,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2018-12-24 13:57:33,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=12358, Unknown=0, NotChecked=0, Total=12656 [2018-12-24 13:57:33,267 INFO L87 Difference]: Start difference. First operand 255 states and 257 transitions. Second operand 113 states. [2018-12-24 13:57:47,613 WARN L181 SmtUtils]: Spent 236.00 ms on a formula simplification that was a NOOP. DAG size: 183 [2018-12-24 13:57:48,183 WARN L181 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 183 [2018-12-24 13:57:48,748 WARN L181 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2018-12-24 13:57:49,151 WARN L181 SmtUtils]: Spent 218.00 ms on a formula simplification that was a NOOP. DAG size: 174 [2018-12-24 13:57:49,629 WARN L181 SmtUtils]: Spent 281.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-24 13:57:50,014 WARN L181 SmtUtils]: Spent 202.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-24 13:57:50,413 WARN L181 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-24 13:57:50,791 WARN L181 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-24 13:57:51,147 WARN L181 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-24 13:57:51,508 WARN L181 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-24 13:57:51,857 WARN L181 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 13:57:52,201 WARN L181 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 13:57:52,527 WARN L181 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 13:57:52,849 WARN L181 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 13:57:53,169 WARN L181 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 13:57:53,470 WARN L181 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 13:57:53,763 WARN L181 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 13:57:54,047 WARN L181 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 13:57:54,311 WARN L181 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 13:57:54,622 WARN L181 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-24 13:57:57,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:57:57,378 INFO L93 Difference]: Finished difference Result 544 states and 549 transitions. [2018-12-24 13:57:57,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2018-12-24 13:57:57,379 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 254 [2018-12-24 13:57:57,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:57:57,380 INFO L225 Difference]: With dead ends: 544 [2018-12-24 13:57:57,381 INFO L226 Difference]: Without dead ends: 402 [2018-12-24 13:57:57,382 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 653 GetRequests, 467 SyntacticMatches, 3 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5410 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=1919, Invalid=32121, Unknown=0, NotChecked=0, Total=34040 [2018-12-24 13:57:57,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2018-12-24 13:57:57,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 259. [2018-12-24 13:57:57,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-12-24 13:57:57,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 261 transitions. [2018-12-24 13:57:57,454 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 261 transitions. Word has length 254 [2018-12-24 13:57:57,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:57:57,454 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 261 transitions. [2018-12-24 13:57:57,454 INFO L481 AbstractCegarLoop]: Interpolant automaton has 113 states. [2018-12-24 13:57:57,454 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 261 transitions. [2018-12-24 13:57:57,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-12-24 13:57:57,455 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:57:57,456 INFO L402 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 36, 36, 1, 1, 1, 1, 1] [2018-12-24 13:57:57,456 INFO L423 AbstractCegarLoop]: === Iteration 65 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:57:57,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:57:57,456 INFO L82 PathProgramCache]: Analyzing trace with hash 1175113710, now seen corresponding path program 61 times [2018-12-24 13:57:57,456 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:57:57,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:57:57,457 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:57:57,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:57:57,457 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:57:57,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:57:59,227 INFO L134 CoverageAnalysis]: Checked inductivity of 4554 backedges. 2628 proven. 1926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:57:59,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:57:59,227 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:57:59,228 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:57:59,228 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:57:59,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:57:59,228 INFO 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 [2018-12-24 13:57:59,237 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:57:59,237 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:57:59,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:57:59,285 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:58:01,796 INFO L134 CoverageAnalysis]: Checked inductivity of 4554 backedges. 2628 proven. 1926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:58:01,796 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:58:03,484 INFO L134 CoverageAnalysis]: Checked inductivity of 4554 backedges. 2628 proven. 1926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:58:03,502 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:58:03,502 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 112 [2018-12-24 13:58:03,502 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:58:03,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2018-12-24 13:58:03,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2018-12-24 13:58:03,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2924, Invalid=9732, Unknown=0, NotChecked=0, Total=12656 [2018-12-24 13:58:03,504 INFO L87 Difference]: Start difference. First operand 259 states and 261 transitions. Second operand 113 states. [2018-12-24 13:58:06,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:58:06,653 INFO L93 Difference]: Finished difference Result 555 states and 559 transitions. [2018-12-24 13:58:06,654 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-12-24 13:58:06,654 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 258 [2018-12-24 13:58:06,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:58:06,655 INFO L225 Difference]: With dead ends: 555 [2018-12-24 13:58:06,655 INFO L226 Difference]: Without dead ends: 264 [2018-12-24 13:58:06,656 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 626 GetRequests, 405 SyntacticMatches, 73 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7920 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=5107, Invalid=17243, Unknown=0, NotChecked=0, Total=22350 [2018-12-24 13:58:06,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2018-12-24 13:58:06,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 262. [2018-12-24 13:58:06,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2018-12-24 13:58:06,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 264 transitions. [2018-12-24 13:58:06,728 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 264 transitions. Word has length 258 [2018-12-24 13:58:06,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:58:06,728 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 264 transitions. [2018-12-24 13:58:06,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has 113 states. [2018-12-24 13:58:06,728 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 264 transitions. [2018-12-24 13:58:06,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2018-12-24 13:58:06,729 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:58:06,729 INFO L402 BasicCegarLoop]: trace histogram [37, 37, 37, 37, 36, 36, 36, 1, 1, 1, 1, 1] [2018-12-24 13:58:06,729 INFO L423 AbstractCegarLoop]: === Iteration 66 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:58:06,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:58:06,730 INFO L82 PathProgramCache]: Analyzing trace with hash 1470273894, now seen corresponding path program 62 times [2018-12-24 13:58:06,730 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:58:06,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:58:06,730 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:58:06,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:58:06,731 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:58:06,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:58:09,852 INFO L134 CoverageAnalysis]: Checked inductivity of 4663 backedges. 36 proven. 4627 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:58:09,852 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:58:09,852 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:58:09,853 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:58:09,853 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:58:09,853 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:58:09,853 INFO 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 [2018-12-24 13:58:09,862 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 13:58:09,863 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 13:58:09,969 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-12-24 13:58:09,969 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:58:09,975 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:58:18,452 INFO L134 CoverageAnalysis]: Checked inductivity of 4663 backedges. 2592 proven. 2071 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:58:18,452 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:58:26,709 INFO L134 CoverageAnalysis]: Checked inductivity of 4663 backedges. 2556 proven. 2107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:58:26,727 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:58:26,728 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 78, 78] total 193 [2018-12-24 13:58:26,728 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:58:26,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 155 states [2018-12-24 13:58:26,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2018-12-24 13:58:26,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3985, Invalid=33457, Unknown=0, NotChecked=0, Total=37442 [2018-12-24 13:58:26,730 INFO L87 Difference]: Start difference. First operand 262 states and 264 transitions. Second operand 155 states. [2018-12-24 13:58:58,422 WARN L181 SmtUtils]: Spent 261.00 ms on a formula simplification that was a NOOP. DAG size: 188 [2018-12-24 13:58:59,140 WARN L181 SmtUtils]: Spent 245.00 ms on a formula simplification that was a NOOP. DAG size: 188 [2018-12-24 13:58:59,884 WARN L181 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 183 [2018-12-24 13:59:00,569 WARN L181 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 179 [2018-12-24 13:59:01,310 WARN L181 SmtUtils]: Spent 298.00 ms on a formula simplification that was a NOOP. DAG size: 174 [2018-12-24 13:59:01,960 WARN L181 SmtUtils]: Spent 215.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-24 13:59:02,575 WARN L181 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-24 13:59:03,193 WARN L181 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-24 13:59:03,782 WARN L181 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-24 13:59:04,353 WARN L181 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-24 13:59:04,922 WARN L181 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-24 13:59:05,456 WARN L181 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 13:59:05,975 WARN L181 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 13:59:06,543 WARN L181 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 13:59:07,058 WARN L181 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 13:59:07,535 WARN L181 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 13:59:07,993 WARN L181 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 13:59:08,437 WARN L181 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 13:59:08,862 WARN L181 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 13:59:09,282 WARN L181 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 13:59:13,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:59:13,618 INFO L93 Difference]: Finished difference Result 705 states and 711 transitions. [2018-12-24 13:59:13,619 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 261 states. [2018-12-24 13:59:13,619 INFO L78 Accepts]: Start accepts. Automaton has 155 states. Word has length 261 [2018-12-24 13:59:13,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:59:13,620 INFO L225 Difference]: With dead ends: 705 [2018-12-24 13:59:13,620 INFO L226 Difference]: Without dead ends: 410 [2018-12-24 13:59:13,624 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 819 GetRequests, 367 SyntacticMatches, 38 SemanticMatches, 414 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37575 ImplicationChecksByTransitivity, 55.8s TimeCoverageRelationStatistics Valid=11795, Invalid=160845, Unknown=0, NotChecked=0, Total=172640 [2018-12-24 13:59:13,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2018-12-24 13:59:13,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 269. [2018-12-24 13:59:13,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2018-12-24 13:59:13,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 271 transitions. [2018-12-24 13:59:13,706 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 271 transitions. Word has length 261 [2018-12-24 13:59:13,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:59:13,706 INFO L480 AbstractCegarLoop]: Abstraction has 269 states and 271 transitions. [2018-12-24 13:59:13,706 INFO L481 AbstractCegarLoop]: Interpolant automaton has 155 states. [2018-12-24 13:59:13,706 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 271 transitions. [2018-12-24 13:59:13,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2018-12-24 13:59:13,707 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:59:13,708 INFO L402 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 37, 37, 37, 1, 1, 1, 1, 1] [2018-12-24 13:59:13,708 INFO L423 AbstractCegarLoop]: === Iteration 67 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:59:13,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:59:13,708 INFO L82 PathProgramCache]: Analyzing trace with hash 1569385749, now seen corresponding path program 63 times [2018-12-24 13:59:13,708 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:59:13,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:59:13,709 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:59:13,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:59:13,709 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:59:13,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:59:17,292 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 37 proven. 4885 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:59:17,292 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:59:17,292 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:59:17,292 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:59:17,292 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:59:17,292 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:59:17,292 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-12-24 13:59:17,301 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-24 13:59:17,301 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-24 13:59:17,347 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-24 13:59:17,347 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 13:59:17,352 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:59:20,878 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 37 proven. 4885 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:59:20,878 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:59:21,201 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 37 proven. 4885 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:59:21,221 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:59:21,222 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 78, 78] total 118 [2018-12-24 13:59:21,222 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:59:21,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2018-12-24 13:59:21,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2018-12-24 13:59:21,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=13728, Unknown=0, NotChecked=0, Total=14042 [2018-12-24 13:59:21,223 INFO L87 Difference]: Start difference. First operand 269 states and 271 transitions. Second operand 119 states. [2018-12-24 13:59:37,854 WARN L181 SmtUtils]: Spent 260.00 ms on a formula simplification that was a NOOP. DAG size: 193 [2018-12-24 13:59:38,489 WARN L181 SmtUtils]: Spent 260.00 ms on a formula simplification that was a NOOP. DAG size: 193 [2018-12-24 13:59:39,100 WARN L181 SmtUtils]: Spent 252.00 ms on a formula simplification that was a NOOP. DAG size: 188 [2018-12-24 13:59:39,548 WARN L181 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2018-12-24 13:59:39,984 WARN L181 SmtUtils]: Spent 231.00 ms on a formula simplification that was a NOOP. DAG size: 179 [2018-12-24 13:59:40,416 WARN L181 SmtUtils]: Spent 223.00 ms on a formula simplification that was a NOOP. DAG size: 174 [2018-12-24 13:59:40,856 WARN L181 SmtUtils]: Spent 215.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-24 13:59:41,266 WARN L181 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-24 13:59:41,671 WARN L181 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-24 13:59:42,126 WARN L181 SmtUtils]: Spent 249.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-24 13:59:42,549 WARN L181 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-24 13:59:42,923 WARN L181 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-24 13:59:43,318 WARN L181 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-24 13:59:43,684 WARN L181 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-24 13:59:44,033 WARN L181 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-24 13:59:44,375 WARN L181 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-24 13:59:44,709 WARN L181 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-24 13:59:45,029 WARN L181 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-24 13:59:45,343 WARN L181 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-24 13:59:45,655 WARN L181 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-24 13:59:45,937 WARN L181 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-24 13:59:49,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:59:49,112 INFO L93 Difference]: Finished difference Result 574 states and 579 transitions. [2018-12-24 13:59:49,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 155 states. [2018-12-24 13:59:49,113 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 268 [2018-12-24 13:59:49,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:59:49,114 INFO L225 Difference]: With dead ends: 574 [2018-12-24 13:59:49,115 INFO L226 Difference]: Without dead ends: 424 [2018-12-24 13:59:49,116 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 689 GetRequests, 493 SyntacticMatches, 3 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6014 ImplicationChecksByTransitivity, 20.0s TimeCoverageRelationStatistics Valid=2101, Invalid=35729, Unknown=0, NotChecked=0, Total=37830 [2018-12-24 13:59:49,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2018-12-24 13:59:49,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 273. [2018-12-24 13:59:49,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 273 states. [2018-12-24 13:59:49,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 275 transitions. [2018-12-24 13:59:49,206 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 275 transitions. Word has length 268 [2018-12-24 13:59:49,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:59:49,206 INFO L480 AbstractCegarLoop]: Abstraction has 273 states and 275 transitions. [2018-12-24 13:59:49,207 INFO L481 AbstractCegarLoop]: Interpolant automaton has 119 states. [2018-12-24 13:59:49,207 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 275 transitions. [2018-12-24 13:59:49,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2018-12-24 13:59:49,208 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:59:49,208 INFO L402 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1] [2018-12-24 13:59:49,208 INFO L423 AbstractCegarLoop]: === Iteration 68 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:59:49,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:59:49,209 INFO L82 PathProgramCache]: Analyzing trace with hash 107131324, now seen corresponding path program 64 times [2018-12-24 13:59:49,209 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:59:49,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:59:49,209 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-24 13:59:49,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:59:49,210 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:59:49,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:59:51,175 INFO L134 CoverageAnalysis]: Checked inductivity of 5073 backedges. 2926 proven. 2147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:59:51,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:59:51,176 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 13:59:51,176 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 13:59:51,176 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 13:59:51,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 13:59:51,176 INFO 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 [2018-12-24 13:59:51,184 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:59:51,184 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-24 13:59:51,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 13:59:51,241 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-24 13:59:53,978 INFO L134 CoverageAnalysis]: Checked inductivity of 5073 backedges. 2926 proven. 2147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:59:53,978 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-24 13:59:55,817 INFO L134 CoverageAnalysis]: Checked inductivity of 5073 backedges. 2926 proven. 2147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 13:59:55,837 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-24 13:59:55,838 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 118 [2018-12-24 13:59:55,838 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-24 13:59:55,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2018-12-24 13:59:55,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2018-12-24 13:59:55,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3238, Invalid=10804, Unknown=0, NotChecked=0, Total=14042 [2018-12-24 13:59:55,839 INFO L87 Difference]: Start difference. First operand 273 states and 275 transitions. Second operand 119 states. [2018-12-24 13:59:59,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-24 13:59:59,338 INFO L93 Difference]: Finished difference Result 585 states and 589 transitions. [2018-12-24 13:59:59,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-12-24 13:59:59,339 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 272 [2018-12-24 13:59:59,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-24 13:59:59,340 INFO L225 Difference]: With dead ends: 585 [2018-12-24 13:59:59,340 INFO L226 Difference]: Without dead ends: 278 [2018-12-24 13:59:59,342 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 660 GetRequests, 427 SyntacticMatches, 77 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8816 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=5656, Invalid=19150, Unknown=0, NotChecked=0, Total=24806 [2018-12-24 13:59:59,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2018-12-24 13:59:59,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 276. [2018-12-24 13:59:59,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 276 states. [2018-12-24 13:59:59,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 278 transitions. [2018-12-24 13:59:59,430 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 278 transitions. Word has length 272 [2018-12-24 13:59:59,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-24 13:59:59,430 INFO L480 AbstractCegarLoop]: Abstraction has 276 states and 278 transitions. [2018-12-24 13:59:59,430 INFO L481 AbstractCegarLoop]: Interpolant automaton has 119 states. [2018-12-24 13:59:59,431 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 278 transitions. [2018-12-24 13:59:59,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-12-24 13:59:59,431 INFO L394 BasicCegarLoop]: Found error trace [2018-12-24 13:59:59,432 INFO L402 BasicCegarLoop]: trace histogram [39, 39, 39, 39, 38, 38, 38, 1, 1, 1, 1, 1] [2018-12-24 13:59:59,432 INFO L423 AbstractCegarLoop]: === Iteration 69 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-24 13:59:59,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-24 13:59:59,432 INFO L82 PathProgramCache]: Analyzing trace with hash 1761642804, now seen corresponding path program 65 times [2018-12-24 13:59:59,432 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-24 13:59:59,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:59:59,433 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-24 13:59:59,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-24 13:59:59,433 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-24 13:59:59,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-24 14:00:03,146 INFO L134 CoverageAnalysis]: Checked inductivity of 5188 backedges. 38 proven. 5150 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-24 14:00:03,147 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:00:03,147 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-24 14:00:03,147 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-24 14:00:03,147 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-24 14:00:03,147 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-24 14:00:03,147 INFO 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 [2018-12-24 14:00:03,155 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-24 14:00:03,155 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-24 14:00:03,244 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-12-24 14:00:03,244 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-24 14:00:03,249 INFO L273 TraceCheckSpWp]: Computing forward predicates...